CN113066626B

CN113066626B - R-T-B permanent magnet material and preparation method and application thereof

Info

Publication number: CN113066626B
Application number: CN202110344567.0A
Authority: CN
Inventors: 陈大崑; 权其琛; 黄佳莹; 付刚; 许德钦; 黄清芳
Original assignee: Fujian Changting Jinlong Rare Earth Co Ltd
Current assignee: Fujian Jinlong Rare Earth Co ltd
Priority date: 2021-03-26
Filing date: 2021-03-26
Publication date: 2023-06-13
Anticipated expiration: 2041-03-26
Also published as: CN113066626A

Abstract

The invention discloses an R-T-B permanent magnet material, a preparation method and application thereof. The R-T-B permanent magnet material comprises the following components in percentage by mass: r, 28.5-32.0 mas; r is a rare earth element containing at least Nd; cu, 0.15-0.20 mas; ga is more than or equal to 0.60 mas; b, more than or equal to 0.99 mas; fe, 64-68 mas; zr, 0.25-0.44 mas; n, 0.20-0.60 mas; n is one or more of Ti, nb and Hf; the weight percentage is that each component accounts for the total weight of the R-T-B permanent magnet material. The R-T-B permanent magnet material has the advantages of uniform distribution of heavy rare earth elements, excellent magnet performance and uniform performance.

Description

R-T-B permanent magnet material and preparation method and application thereof

Technical Field

The invention relates to an R-T-B permanent magnet material, a preparation method and application thereof.

Background

The R-T-B permanent magnet material (R is a rare earth element, T is a transition metal element and a third main group metal element, and B is a boron element) is widely used in fields such as electronic products, automobiles, wind power, home appliances, elevators, industrial robots, etc. due to its excellent magnetic properties, for example, in a hard disk, a mobile phone, an earphone, a permanent magnet motor such as an elevator traction machine, a generator, etc. as an energy source, etc., the demand thereof is increasingly expanding, and the demands of various manufacturers for magnetic properties such as remanence, coercive force, etc. are also gradually increasing.

Ren Shaoqing et al report the effect of a CuGa grain boundary addition on the magnetic properties and thermal stability of sintered NdFeB permanent magnets. It is found that when Ga is added to the neodymium-iron-boron magnetic powder containing Cu, a Cu-Ga phase can be formed, but the addition of Ga also can cause the black holes in the magnet matrix to be obviously increased, so that the density is lower, and further, the remanence and the magnetic energy product are reduced. It can be seen that the effect of different elements and different contents in the neodymium-iron-boron magnet on the microstructure is extremely large. The coercivity of the neodymium-iron-boron magnet material formed in this document is still at a low level.

Chinese patent document CN 111724955a discloses an R-T-B series permanent magnet comprising the following components in mass content: the total content of Nd, pr, dy and Tb is 30.00-32.20 mas, co is 0.3-1.3 mas, zr is 0.21-0.85 mas, and B is 0.90-1.02 mas%. The heavy rare earth element in the magnet material has a concentration gradient decreasing from the surface of the magnet to the inside, and the preparation process is a heavy rare earth coating or diffusion process. Although the corrosion resistance of the material is improved, the consistency of the magnet performance is poor. And because of a certain concentration gradient of heavy rare earth distribution in the magnet, the process is generally used for products with thinner orientation.

Therefore, the R-T-B permanent magnet material with uniform distribution of heavy rare earth elements, high coercivity and high remanence is a technical problem to be solved in the field.

Disclosure of Invention

The invention aims to overcome the defect that the performance of a magnet is deteriorated due to the fact that a boron-rich phase is easily generated when the B content of an R-T-B permanent magnet material is more than 0.99mas percent in the prior art, and provides the R-T-B permanent magnet material, a preparation method and application thereof. Through a great deal of research and experiments, the inventor discovers that the R-T-B permanent magnet material with uniform heavy rare earth element distribution, excellent magnet performance and uniform performance can be prepared by adding one or more of Zr, ti, nb and Hf and properly matching Ga and Cu with other elements within a certain range.

In order to achieve the above object, the present invention provides the following technical solutions:

one of the technical schemes provided by the invention is as follows: an R-T-B permanent magnet material comprises the following components in percentage by mass:

r, 28.5-32.0 mas; r is a rare earth element containing at least Nd;

Cu，0.15～0.20mas％；

Ga，≥0.60mas％；

B，≥0.99mas％；

Fe，64～68mas％；

Zr，0.25～0.44mas％；

n, 0.20-0.60 mas; the N is one or more of Ti, nb and Hf;

the percentages are the mass percentages of the components in the total mass of the R-T-B permanent magnet material.

In the present invention, the R-T-B permanent magnet material may include a rare earth-rich phase, boride and primary phase grains.

Wherein the rare earth-rich phase may be a neodymium-rich phase. The boride may be one or more of ZrB, hfB, nbB and TiB. The main phase grains are typically Nd ₂ Fe ₁₄ And B grains.

The rare earth-rich phase may be distributed with Cu and Ga. Wherein the distribution amount of Cu in the rare earth-rich phase may be 95% or more of the Cu. The distribution amount of the Ga in the rare earth-rich phase may be 95% or more of the Ga. The main phase grains may have Ga distributed inside. The Ga may be distributed in an amount of 5% or less of the Ga in the inside of the main phase grains.

The rare earth-rich phase and the boride are preferably distributed with N at the grain boundary, and the N distributed at the grain boundary may be combined with B to form boride. The distribution amount of the N at the grain boundary is preferably 95% or more of the N. Wherein, the N can replace Fe in the main phase crystal grains and is distributed in the main phase crystal grains. The distribution amount of N of Fe in the substituted main phase crystal grains is preferably 5% or less of the N.

In the invention, the content of R is preferably 29.0-31.0 mas; more preferably 29.74 to 29.95mas%; for example 29.74, 29.89, 29.90, 29.95, 30.13, 30.28, 30.56 or 30.99; the weight percentage is that the R accounts for the total weight of the R-T-B permanent magnet material.

Wherein the content of Nd is preferably 29.5-31.0 mas; more preferably 29.74 to 30.99mas%; for example 29.74, 29.89, 29.90, 29.95, 30.13, 30.28 or 30.99; the mass percentage of Nd is the mass percentage of the total mass of the R-T-B permanent magnet material.

The R may also contain Pr. When Pr is contained in the R, the content of Pr can be 0-0.3 mas; preferably 0.28 mas; the mass percentage of Pr is the mass percentage of the total mass of the R-T-B permanent magnet material.

In the invention, the content of Cu is preferably 0.16-0.20 mas; for example 0.17, 0.18, or 0.19 mas; the percentage is the mass percentage of the Cu in the total mass of the R-T-B permanent magnet material.

In the present invention, the Ga content is preferably 0.60-0.80 mas; more preferably 0.62 to 0.78 mas; for example 0.64mas, 0.65mas% or 0.75 mas; the percentage is the mass percentage of the Ga in the total mass of the R-T-B permanent magnet material.

In the invention, the content of B is preferably 0.99-1.15 mas; more preferably 1.00 to 1.05 mas; for example 1.01mas% or 1.02 mas; the weight percentage is that the mass of the B accounts for the total mass of the R-T-B permanent magnet material.

In the present invention, the ratio of the atomic percent of R to the atomic percent of B may be less than 2.50; for example 0.45 or 2.32.

In the present invention, the ratio of the atomic percent of Fe to the atomic percent of B may be less than 14; for example 0.08.

In the invention, the content of Fe is preferably 64.3-67.5 mas; for example 64.38, 64.59, 64.79, 65.48, 65.81, 65.84, 66.21, 66.55, 67.00, 67.04, or 67.60; the weight percentage is that the Fe accounts for the total weight of the R-T-B permanent magnet material.

In the invention, the Zr content is preferably 0.26-0.38 mas; for example 0.28 mas; the weight percentage is that the Zr accounts for the total weight of the R-T-B permanent magnet material.

In the invention, the content of N is preferably 0.28-0.52 mas; for example 0.29, 0.31, 0.33, 0.39 or 0.51 mas; the weight percentage is that the mass of the N accounts for the total mass of the R-T-B permanent magnet material.

When N contains Ti, the content of Ti may be 0.14mas% or less or 0.29 to 0.55mas%; preferably 0.30 to 0.40 mas; for example 0.10 or 0.31mas%; the weight percentage is that the Ti accounts for the total weight of the R-T-B permanent magnet material.

When N contains Nb, the content of Nb may be 0 to 0.51 mas; preferably 0.25 to 0.40 mas; for example 0.29mas%, 0.33mas% or 0.39 mas; the weight percentage is that the weight percentage of the Nb accounts for the total weight of the R-T-B permanent magnet material.

When N contains Hf, the content of Hf may be 0 to 0.8mas% and not 0mas%; the weight percentage is that the weight percentage of the Hf accounts for the total weight of the R-T-B permanent magnet material.

In the present invention, the N is preferably Ti.

Wherein the Ti content is preferably 0.28-0.32 mas; more preferably 0.29 or 0.31mas%; the weight percentage is that the Ti accounts for the total weight of the R-T-B permanent magnet material.

Alternatively, the N is preferably Nb.

Wherein the content of Nb is preferably 0.30-0.55 mas; more preferably 0.33, 0.39 or 0.51 mas; the weight percentage is that the weight percentage of the Nb accounts for the total weight of the R-T-B permanent magnet material.

Alternatively, the N is preferably Ti and Nb.

Wherein the Ti content is preferably 0.05-0.15 mas; more preferably 0.10 mas; the weight percentage is that the Ti accounts for the total weight of the R-T-B permanent magnet material. The Nb content is preferably 0.25-0.35 mas; more preferably 0.29 mas; the weight percentage is that the weight percentage of the Nb accounts for the total weight of the R-T-B permanent magnet material. The N is further preferably 0.10mas% Ti and 0.29mas% Nb.

In the present invention, those skilled in the art know that the R-T-B permanent magnetic material further includes unavoidable impurities, such as one or more of C, O, mn and Al, introduced during the preparation process.

When the R-T-B permanent magnet material contains C, the content of the C can be 0.08-0.10 mas% and is not 0.10mas%; the percentage is the mass percentage of the mass of the C in the total mass of the R-T-B permanent magnet material.

When Mn is contained in the R-T-B permanent magnet material, the Mn content may be 0.01mas% or less; the mass percentage of the Mn is the mass percentage of the total mass of the R-T-B permanent magnet material.

In the present invention, it is known to those skilled in the art that, in order to further improve the magnetic properties, the R-T-B-based permanent magnetic material may further include RH, which is a heavy rare earth element.

When the R-T-B permanent magnet material includes RH, the R-T-B permanent magnet material preferably further includes a shell layer of a main phase grain.

Wherein the shell layer of the main phase grain preferably comprises RH ₂ Fe ₁₄ And B grains. The shell of the main phase grains is preferably distributed with RH. The RH is preferably distributed in the shell layer of the main phase grains in an amount of 95% or more of the RH.

In the present invention, the kind of RH preferably includes one or more of Dy, tb and Ho. The RH content can be the content conventional in the art, and is preferably 1.05-3.20 mas; more preferably 1.20 to 2.80 mas; for example, 1.25, 1.60, 2.40, or 2.65 mas; the percentage is the mass percentage of the RH to the total mass of the R-T-B permanent magnet material.

When the RH contains Dy, the Dy content is preferably 1.05 to 1.6 mas; for example 1.25 or 1.3mas%; the Dy accounts for the mass percent of the total mass of the R-T-B permanent magnet material.

When the RH contains Tb, the content of Tb is preferably 1.05 to 1.6 mas; for example 1.25 or 1.3mas%; the weight percentage of the Tb is the weight percentage of the total weight of the R-T-B permanent magnet material.

In the present invention, the RH is preferably Tb. The content of Tb is preferably 1.00-1.20 mas; more preferably 1.05 mas; the weight percentage is that the weight percentage of Tb accounts for the total weight of the R-T-B permanent magnet material.

Alternatively, the RH is preferably Dy. The Dy content is preferably 1.00-1.80 mas; more preferably 1.25 or 1.60mas%; the mass percentage of Dy is the mass percentage of the total mass of the R-T-B permanent magnet material.

Alternatively, the RH is preferably Tb and Dy. The content of Tb is preferably 1.00-1.20 mas; more preferably 1.05 mas; the weight percentage is that the weight percentage of Tb accounts for the total weight of the R-T-B permanent magnet material. The Dy content is preferably 1.00-1.80 mas; more preferably 1.25 or 1.60mas%; the mass percentage of Dy is the mass percentage of the total mass of the R-T-B permanent magnet material. The RH is further preferably 1.05mas% Tb and 1.60mas% Dy.

In the invention, the R-T-B permanent magnet material can also comprise Co.

When the R-T-B permanent magnet material comprises Co, the Co is preferably substituted for Fe in the main phase crystal grains and is distributed in the main phase crystal grains; the distribution amount of Co substituting Fe in the main phase crystal grain is preferably more than 95% of the Co; co is preferably also distributed at the grain boundaries of the rare earth-rich phase and the boride; the distribution amount of the Co at the grain boundary is preferably 5% or less of the Co.

In the present invention, the Co content may be 1.50 to 2.00mas, preferably 1.55 mas; the mass percentage of the Co is the mass percentage of the total mass of the R-T-B permanent magnet material.

When the R-T-B system permanent magnet material includes Co, the Co may replace Fe in the main phase grains and be distributed inside the main phase grains. The amount of Co distributed to replace Fe in the main phase grains is preferably 95% or more of the Co. Co may also be distributed at the grain boundaries of the rare earth-rich phase and the boride. The distribution amount of the Co at the grain boundary is preferably 5% or less of the Co.

In the invention, the R-T-B permanent magnet material preferably comprises the following components in percentage by mass:

r, 29.0-31.0 mas; r is a rare earth element containing at least Nd;

Cu，0.16～0.20mas％；

Ga，0.60～0.80mas％；

B，0.99～1.15mas％；

Fe，64.3～67.5mas％；

Zr，0.26～0.38mas％；

N, 0.28-0.52 mas; the N is one or more of Ti, nb and Hf;

In the invention, the R-T-B permanent magnet material more preferably comprises the following components in percentage by mass:

r, 29.74-29.95 mas; r is a rare earth element containing at least Nd;

Cu，0.16～0.20mas％；

Ga，0.62～0.78mas％；

B，1.00～1.05mas％；

Fe，64.3～67.5mas％；

Zr，0.26～0.38mas％；

n, 0.28-0.52 mas; the N is one or more of Ti, nb and Hf;

In the invention, the R-T-B permanent magnet material further preferably comprises the following components in percentage by mass:

r, 28.5-32.0 mas; r is a rare earth element containing at least Nd;

Cu，0.15～0.20mas％；

Ga，≥0.60mas％；

B，≥0.99mas％；

Fe，64～68mas％；

Zr，0.25～0.44mas％；

n, 0.20-0.60 mas; n is one or more of Ti, nb and Hf;

RH, 1.05-3.20 mas; RH is one or more of Dy, tb and Ho;

Still more preferably, the R-T-B permanent magnet material comprises the following components in mass content:

r, 28.5-32.0 mas; r is a rare earth element containing at least Nd;

Cu，0.15～0.20mas％；

Ga，≥0.60mas％；

B，≥0.99mas％；

Fe，64～68mas％；

Zr，0.25～0.44mas％；

n, 0.20-0.60 mas; n is one or more of Ti, nb and Hf;

RH, 1.05-3.20 mas; RH is one or more of Dy, tb and Ho;

Co，1.50～2.00mas％；

The second technical scheme provided by the invention is as follows: the preparation method of the R-T-B permanent magnet material comprises the following steps: the main alloy and the auxiliary alloy are prepared by a double-alloy method;

wherein the types of elements in the main alloy comprise R, cu, ga, B, fe, zr and N; the types of elements in the secondary alloy include R, cu, ga, B, fe, zr.

In the invention, the mass ratio of the main alloy to the auxiliary alloy is preferably (9-99): 1, a step of; more preferably (16 to 33): 1, a step of; for example 18:1, 19:1, 24:1 or 32:1.

The sum of the contents of the elements in the main alloy and the auxiliary alloy obtained according to the mass ratio is generally the contents of the components of the R-T-B permanent magnet material according to the common knowledge in the field. For example, the Nd content of the master alloy is multiplied by the ratio of the master alloy to the R-T-B based permanent magnet material, and the Nd content of the slave alloy is multiplied by the ratio of the master alloy to the R-T-B based permanent magnet material, the sum of the two being the Nd content of the R-T-B based permanent magnet material.

In the main alloy, R is a rare earth element at least containing Nd; the content of R is preferably 30.0-32 mas; more preferably 30.1, 30.16, 30.4, 30.5, 31.3 or 31.5; the percentage is the mass percentage of the R in the total mass of the main alloy. Wherein the content of Nd is preferably 30.0-31.5 mas; more preferably 30.1, 30.16, 30.4, 30.5 or 31.3; the percentage is the mass percentage of the Nd in the total mass of the main alloy.

The Cu content is preferably 0.1-0.22 mas; more preferably 0.16, 0.18, 0.19 or 0.21 mas; the percentage is the mass percentage of the Cu in the total mass of the main alloy.

The Ga content is preferably 0.36-0.60 mas; more preferably 0.37, 0.38, 0.40, 0.41, 0.50, 0.55, 0.556 or 0.56; the percentage is the mass percentage of the Ga in the total mass of the main alloy.

The content of the B is preferably 1.00-1.05 mas; more preferably 1.02mas%, 1.03mas% or 1.04 mas; the percentage is the mass percentage of the mass of the B in the total mass of the main alloy.

The content of Fe is preferably 65.5-68.5 mas; more preferably 65.60, 65.97, 66.24, 66.26, 66.31, 67.04, 67.51, 67.57 or 68.07; the percentage is the mass percentage of the Fe in the total mass of the main alloy.

The Zr content is preferably 0.15-0.3 mas; more preferably 0.17 or 0.21mas%; the weight percentage is that the Zr accounts for the total weight of the main alloy.

The content of N is preferably 0.3-0.55 mas; more preferably 0.306, 0.33, 0.345, 0.405, 0.412 or 0.531; the percentage is the mass percentage of the N in the total mass of the main alloy.

Wherein when N contains Ti, the content of Ti can be 0.10-0.35 mas; preferably 0.11, 0.306 or 0.33mas%; the weight percentage is that the Zr accounts for the total weight of the main alloy. When N contains Nb, the content of Nb may be 0.3 to 0.55 mas; preferably 0.345mas%, 0.405mas% or 0.531 mas; the percentage is the mass percentage of the Nb in the total mass of the main alloy.

The N is preferably Ti and Nb; more preferably 0.11mas% Ti and 0.30mas% Nb.

In the master alloy, it is known to those skilled in the art that, in order to further improve the magnetic properties, the master alloy may further include RH, which is a heavy rare earth element.

The kind of RH preferably includes one or more of Dy, tb and Ho. The RH content can be the content conventional in the art, and is preferably 0.75-2.00 mas; more preferably 0.78, 1.19 or 1.97mas%; the percentage is the mass percentage of the RH to the total mass of the main alloy.

Wherein, when the RH contains Dy, the Dy content is preferably 0.75 to 1.6mas, for example 0.78mas; the mass percentage of Dy is the mass percentage of Dy in the total mass of the main alloy. When the RH comprises Tb, the content of Tb is preferably 1.05 to 1.6mas%, for example 1.19mas%; the weight percentage is that of the Tb to the total weight of the main alloy.

The RH is preferably Tb and Dy; more preferably 0.78mas% Tb and 1.19mas% Dy.

The master alloy may also include Co. The Co content may be 1.50 to 1.80mas, preferably 1.60mas, 1.63mas% or 1.64 mas; the mass percentage of the Co is the mass percentage of the total mass of the main alloy.

In the invention, the main alloy can comprise the following components in percentage by mass:

r, 30.0-31.5 mas; r is a rare earth element containing at least Nd;

Cu，0.1～0.22mas％；

Ga，0.36～0.60mas％；

B，1.00～1.05mas％；

Fe，65.5～68.5mas％；

Zr，0.15～0.3mas％；

n, 0.3-0.55 mas; the N is one or more of Ti, nb and Hf;

the percentages are the mass percentages of the components in mass of the total mass of the main alloy.

In the invention, the main alloy preferably comprises the following components in percentage by mass:

r, 30.0-31.5 mas; r is a rare earth element containing at least Nd;

Cu，0.1～0.22mas％；

Ga，0.36～0.60mas％；

B，1.00～1.05mas％；

Fe，65.5～68.5mas％；

Zr，0.15～0.3mas％；

n, 0.3-0.55 mas; preferably, ti in the N is 0.10-0.35 mas; nb, 0.3-0.55 mas;

In the invention, the main alloy more preferably comprises the following components in percentage by mass:

r, 30.0-31.5 mas; r is a rare earth element containing at least Nd;

Cu，0.1～0.22mas％；

Ga，0.36～0.60mas％；

B，1.00～1.05mas％；

Fe，65.5～68.5mas％；

Zr，0.15～0.3mas％；

n, 0.3-0.55 mas; preferably, ti in the N is 0.10-0.35 mas; nb, 0.3-0.55 mas;

RH, 0.75-2.00 mas; the RH comprises Tb and/or Dy;

In the invention, the main alloy further preferably comprises the following components in percentage by mass:

R, 30.0-31.5 mas; r is a rare earth element containing at least Nd;

Cu，0.1～0.22mas％；

Ga，0.36～0.60mas％；

B，1.00～1.05mas％；

Fe，65.5～68.5mas％；

Zr，0.15～0.3mas％；

n, 0.3-0.55 mas; preferably, ti in the N is 0.10-0.35 mas; nb, 0.3-0.55 mas;

RH, 0.75-2.00 mas; the RH comprises Tb and/or Dy;

Co，1.50～1.80mas％；

In the auxiliary alloy, R is a rare earth element at least containing Nd; the content of R is preferably 25.0-40.0 mas; more preferably 25.0, 30.0, 35.0, or 40.0; the percentage is the mass percentage of the R in the total mass of the auxiliary alloy. Wherein the Nd content is preferably 20.0-30.0 mas; more preferably 25.0 mas; the percentage is the mass percentage of the Nd in the total mass of the auxiliary alloy.

The Pr content is preferably 5.0-10.0 mas; more preferably 7.0 mas; the mass percentage of Pr is the mass percentage of the total mass of the auxiliary alloy.

The Cu content is preferably 2.50-3.50 mas; more preferably 3.00 mas; the percentage is the mass percentage of the Cu in the total mass of the auxiliary alloy.

The Ga content is preferably 4.50-6.00 mas; more preferably 5.00mas% or 5.50 mas; the percentage is the mass percentage of the Ga in the total mass of the auxiliary alloy.

The content of the B is preferably 0.30-0.70 mas; more preferably 0.40, 0.50 or 0.60mas%; the weight percentage is that the weight percentage of the B accounts for the total weight of the auxiliary alloy.

The content of Fe is preferably 38-66 mas; more preferably 38, 39.6, 44.2, 44.6, 63, 63.9, 64, 64.6 or 66; the percentage is the mass percentage of the Fe in the total mass of the main alloy.

The Zr content is preferably 3.00-6.00 mas; more preferably 3.00, 5.00, 5.40, 5.50 or 5.60; the percentage is the mass percentage of the N in the total mass of the auxiliary alloy.

The species of the element in the secondary alloy may also include N. The N is one or more of Ti, nb and Hf. The Ti, nb and Hf contents may be conventional in the art.

In the auxiliary alloy, those skilled in the art know that, in order to further improve the magnetic properties, the auxiliary alloy may further include RH, which is a heavy rare earth element.

The kind of RH preferably includes one or more of Dy, tb and Ho. The RH content can be the content conventional in the art, preferably 10.00-25.00 mas; more preferably 10.00mas% or 15.00mas%; the percentage is the mass percentage of the RH to the total mass of the auxiliary alloy.

Wherein, when the RH contains Dy, the Dy content is preferably 10.00-25.00 mas; for example 15 mas; the Dy accounts for the mass percent of the total mass of the auxiliary alloy. When the RH contains Tb, the content of Tb is preferably 10.00-20.00 mas; the weight percentage of the Tb is the weight percentage of the total weight of the auxiliary alloy.

In the invention, the auxiliary alloy can comprise the following components in percentage by mass:

r, 25.0-40.0 mas; r is a rare earth element containing at least Nd;

Cu，2.50～3.50mas％；

Ga，4.50～6.00mas％；

B，0.30～0.70mas％；

Fe，38～66mas％；

Zr，3.00～6.00mas％；

the percentages are the mass percentages of the components in the total mass of the auxiliary alloy.

In the invention, the auxiliary alloy preferably comprises the following components in percentage by mass:

r, 25.0-40.0 mas; preferably, nd is 20.0-30.0 mas in the R; pr, 5.0-10.0 mas;

Cu，2.50～3.00mas％；

Ga，5.00～5.50mas％；

B，0.40～0.60mas％；

Fe，38～66mas％；

Zr，3.00～6.00mas％；

RH, 10.00-25.00 mas; the RH comprises Tb and/or Dy;

In the invention, the auxiliary alloy more preferably comprises the following components in percentage by mass:

r, 25.0-40.0 mas; preferably, nd is 20.0-30.0 mas in the R; pr, 5.0-10.0 mas;

Cu，2.50～3.00mas％；

Ga，5.00～5.50mas％；

B，0.40～0.60mas％；

Fe，38～66mas％；

Zr，3.00～6.00mas％；

RH, 10.00-25.00 mas; preferably, tb, 10.00-20.00 mas in RH; dy, 10.00-25.00 mas;

In the invention, the preparation process of the double alloy method generally comprises the steps of sequentially sintering and aging mixed alloy powder of the main alloy and the auxiliary alloy.

Wherein the mixed alloy powder can be generally obtained by mixing a main alloy and an auxiliary alloy. The mixing is preferably uniform. The mixing can be that the main alloy and the auxiliary alloy are mixed and then subjected to hydrogen breaking and air flow grinding treatment, or the main alloy and the auxiliary alloy are respectively subjected to hydrogen breaking and air flow grinding treatment and then are mixed uniformly; preferably, the main alloy and the auxiliary alloy are mixed and then subjected to hydrogen breaking and air flow grinding treatment.

The hydrogen cracking can be saturated hydrogen absorption under the hydrogen pressure of 0.067-0.098 MPa, and dehydrogenation is carried out at 480-580 ℃; preferably saturated hydrogen absorption under a hydrogen pressure of 0.067 to 0.098MPa and dehydrogenation at 550 ℃. The particle size of the powder after the air flow grinding treatment can be 3.8-4.2 mu m; preferably 3.9 μm.

The sintering temperature may be 1000 ℃ or higher, preferably 1050 to 1200 ℃, and more preferably 1070 ℃. The sintering time may be 4 to 7 hours, preferably 6 hours. More preferably, the sintering may further comprise a back firing step; the temperature of the back firing can be 1050-1100 ℃, and is preferably 1080 ℃; the time for the back firing may be 3 to 5 hours, preferably 4 hours.

Wherein the aging treatment comprises a primary aging treatment and a secondary aging treatment.

The primary aging treatment can be a conventional primary aging treatment process in the art; preferably, the primary aging treatment is performed under argon atmosphere. The purity of argon in the argon atmosphere is more than 99.9%. The temperature of the primary ageing treatment may be conventional in the art, preferably 800 to 950 ℃, more preferably 900 ℃. The primary ageing treatment time can be 2-4 hours, preferably 3 hours.

The secondary aging treatment may be a conventional secondary aging treatment process in the art. The temperature of the secondary ageing treatment may be conventional in the art, preferably 430 to 490 c, more preferably 490 c. The time of the secondary aging treatment may be 2 to 4 hours, preferably 3 hours.

The rate of heating to the temperature of the primary aging treatment or the temperature of the secondary aging treatment is preferably 3 to 5 ℃/min. The starting point of the warming may be room temperature. The room temperature is generally 25 ℃ + -5 ℃.

In the invention, the preparation method of the master alloy can be to prepare each element in the master alloy into master alloy solution; and then the main alloy solution passes through a rotating copper roller, and is subjected to refining and casting in sequence, and is cooled to obtain the main alloy cast sheet.

Wherein, the rotating speed of the copper roller is preferably 40+/-0.2 rpm. The refining temperature is preferably 1520.+ -. 20 ℃. The casting temperature is preferably 1420.+ -. 10 ℃. The cooling may be to below 50 ℃.

In the invention, the preparation method of the auxiliary alloy can be to prepare each element in the auxiliary alloy into auxiliary alloy solution; and then the auxiliary alloy solution passes through a copper roller which rotates, is refined and cast in sequence, and is cooled to prepare the auxiliary alloy casting sheet.

Wherein, the rotating speed of the copper roller is preferably 40+/-0.2 rpm. The refining temperature is preferably 1400-1570 ℃. The casting temperature is preferably 1420 to 1470 ℃. The cooling may be to below 50 ℃.

The third technical scheme provided by the invention is as follows: an R-T-B permanent magnet material is prepared by adopting the preparation method.

The technical scheme provided by the invention is as follows: an application of the R-T-B permanent magnetic material as electronic components.

The fields of application may be automobile driving field, wind power field, servo motor and home appliance field (such as air conditioner).

On the basis of conforming to the common knowledge in the field, the above preferred conditions can be arbitrarily combined to obtain the preferred examples of the invention.

The reagents and materials used in the present invention are commercially available.

The invention has the positive progress effects that:

(1) The R-T-B permanent magnet material has excellent magnetic performance: br is more than or equal to 13.63kGs, hcb is more than or equal to 13.36kOe, hcj is more than or equal to 18.9kOe, (BH) max is more than or equal to 45.53MGOe, hk is more than or equal to 18.71kOe, hk/Hcj is more than or equal to 0.99, and HD5 is more than or equal to 18.71kOe; the magnet has good temperature stability, the absolute value of the Br temperature coefficient alpha%/DEGC between 20 and 80 ℃ is less than or equal to 0.11, and the absolute value of the Br temperature coefficient alpha%/DEGC between 20 and 140 ℃ is less than or equal to 0.12.

(2) The relative magnetic permeability of the R-T-B permanent magnetic material is less than or equal to 1.02, the squareness is more than or equal to 99%, and the consistency of the magnet performance is good.

(3) The R-T-B permanent magnet material has uniform distribution of heavy rare earth elements and uniform performance.

Detailed Description

The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention. The experimental methods, in which specific conditions are not noted in the following examples, were selected according to conventional methods and conditions, or according to the commercial specifications.

Examples 1 to 12 and comparative examples 1 to 8

1. Examples 1-12 master and slave alloys were prepared according to the composition and content of the R-T-B series permanent magnet materials in table 1.

Comparative examples 1 to 8 main alloys and auxiliary alloys were prepared according to the components and contents of the R-T-B system permanent magnet materials in table 2.

TABLE 1

Note that: "/" indicates that the R-T-B permanent magnet material does not contain the element.

TABLE 2

2. The preparation process of the main alloy comprises the following steps:

preparing a master alloy solution from each element in the master alloys shown in tables 1 and 2; then the main alloy solution passes through a rotating copper roller (the rotating speed is 40+/-0.2 rpm), and is subjected to refining and casting in sequence, and is cooled to obtain a main alloy casting sheet; wherein the refining temperature is 1520+/-20 ℃, the refining time is 8-30 min, the casting temperature is 1420+/-10 ℃, the casting time is 1-3 min, and the cooling is carried out to below 50 ℃.

3. The preparation process of the auxiliary alloy comprises the following steps:

preparing a secondary alloy solution from each element in the secondary alloys shown in tables 1 and 2; then the auxiliary alloy solution passes through a rotating copper roller (the rotating speed is 40+/-0.2 rpm), and is subjected to refining and casting in sequence, and is cooled to prepare an auxiliary alloy casting sheet; wherein the refining temperature is 1400-1570 ℃, the refining time is 8-30 min, the casting temperature is 1420-1470 ℃, the casting time is 1-3 min, and the cooling is carried out to below 50 ℃.

4. The preparation process of the R-T-B permanent magnet material comprises the following steps:

(1) Mixing the main alloy and the auxiliary alloy shown in the table 1 and the table 2 according to a proportion, and then sequentially carrying out hydrogen breaking, air flow grinding treatment and mixing to obtain mixed alloy powder;

Wherein, the hydrogen cracking is saturated hydrogen absorption under the hydrogen pressure of 0.067MPa, and dehydrogenation is carried out at 550 ℃; the mixture is processed for 3 hours in a three-dimensional mixer, and the particle size of the mixed alloy powder after the air flow grinding treatment is 3.8-4.2 mu m.

(2) Sintering the mixed alloy powder for 6 hours at 1050-1200 ℃ and sintering again for 4 hours at 1080 ℃.

(3) And carrying out primary aging treatment for 3 hours at 900 ℃ and secondary aging treatment for 3 hours at 490 ℃ to obtain the R-T-B permanent magnet material.

Among them, the particle diameters of the powder obtained by the jet milling treatment in examples 1 to 12 and comparative examples 1 to 8 are shown in Table 3.

TABLE 3 Table 3

Numbering device	Particle diameter of powder μm
		Example 1	3.83
Example 2	3.85
		Example 3	3.82
Example 4	3.85
		Example 5	3.90
Example 6	4.05
		Example 7	4.20
Example 8	3.85
		Example 9	3.86
Example 10	4.20
		Example 11	3.85
Example 12	3.98
		Comparative example 1	3.83
Comparative example 2	3.83
		Comparative example 3	3.85
Comparative example 4	3.85
		Comparative example 5	3.82
Comparative example 6	3.85
		Comparative example 7	3.85
Comparative example 8	3.90

Effect examples

1. Component measurement:

the components and their contents of the R-T-B system permanent magnet materials prepared in examples 1 to 12 and comparative examples 1 to 8 were measured using a high frequency inductively coupled plasma emission spectrometer (ICP-OES, instrument model: icap 6300). The test results show that the components and the contents of the R-T-B permanent magnet materials in the examples 1 to 12 and the comparative examples 1 to 8 are close to the addition amount of the raw materials, and no obvious difference exists; tables 4 and 5 are specifically shown below.

TABLE 4 Table 4

	Nd	Pr	Cu	Ga	B	Zr	Ti	Nb	Tb	Dy	Co	Fe
													Example 1	29.75	/	0.20	0.61	1.00	0.25	0.29	/	/	/	/	67.90
Example 2	29.95	/	0.19	0.65	1.01	0.38	/	0.39	/	/	/	67.43
													Example 3	30.13	/	0.17	0.60	1.01	0.44	/	0.33	/	/	/	67.32
Example 4	30.28	0.28	0.18	0.75	1.02	0.26	/	0.51	/	/	/	66.71
													Example 5	30.99	/	0.15	0.78	1.02	0.45	0.10	0.29	/	/	/	66.22
Example 6	29.74	/	0.20	0.62	1.00	0.27	0.29	/	1.06	/	/	66.83
													Example 7	30.99	/	0.15	0.78	1.02	0.45	0.10	0.29	/	1.25	/	64.97
Example 8	29.95	/	0.19	0.65	1.01	0.38	/	0.39	1.06	1.60	/	64.77
													Example 9	29.95	/	0.19	0.65	1.01	0.38	/	0.39	/	/	1.55	65.88
Example 10	29.89	/	0.18	0.64	0.99	0.29	0.31	/	1.06	/	1.55	65.09
													Example 11	29.90	/	0.20	0.64	0.99	0.28	0.31	/	/	/	1.55	66.13
Example 12	29.89	/	0.18	0.64	0.99	0.28	0.31	/	/	1.05	1.55	65.10

TABLE 5

	Nd	Cu	Ga	B	Zr	Ti	Nb	Fe
									Comparative example 1	29.75	0.1045	0.611	0.9985	0.25	0.2907	/	67.9953
Comparative example 2	29.75	0.304	0.611	1.0035	0.25	0.2907	/	67.7908
									Comparative example 3	29.947	0.187	0.165	1.0141	0.381	/	0.39285	67.91305
Comparative example 4	29.947	0.187	0.5045	1.0141	0.381	/	0.39285	67.57355
									Comparative example 5	30.13	0.27075	0.4875	1.0085	0.4365	/	0.32775	67.339
Comparative example 6	29.947	0.187	0.65	0.8007	0.381	/	0.39285	67.64145
									Comparative example 7	29.947	0.187	0.65	1.0141	/	/	/	68.2019
Comparative example 8	30.985	0.152	0.782	1.0175	0.44	/	/	66.6235

2. Testing of magnetic properties: the R-T-B permanent magnet materials prepared in examples 1 to 12 and comparative examples 1 to 8 were subjected to magnetic property detection by using NIM-10000H type BH bulk rare earth permanent magnet nondestructive measurement system of China measuring institute (the test sample is a cylinder with diameter D10 mm. Times.thickness 10 mm). The test results are shown in Table 6.

Wherein,,

"Br" refers to remanence; after the permanent magnetic material is saturated and magnetized, the magnetism which can be kept by the external magnetic field is removed, and the permanent magnetic material is called residual magnetism.

"Hc" refers to coercivity, hcj refers to magnetic polarization strength coercivity (intrinsic coercivity); hcb refers to the magnetic induction coercivity.

"(BH) max" means the maximum magnetic energy product.

"Hk" refers to the knee point coercivity.

"Hk/Hcj" refers to squareness.

"HD5" is a technical index defining squareness, according to the conventional in the art, two points a (h=0.2 Hcj) and b (h=0.7 Hcj) are taken from the J-H demagnetizing curve and connected into a straight line, and then a straight line parallel to ab is made through a 0.95Br point, and the abscissa value of the intersection point of the straight line and the J-H demagnetizing curve is HD5.

The formula of the Br temperature coefficient alpha is:

the normal temperature in the formula is 20 ℃, and the high temperature is 80 ℃ or 140 ℃.

TABLE 6

3. Testing of magnetic property consistency: the test results are shown in Table 7.

(1) Square sq=hk/Hcj; wherein Hk is the value of the corresponding external magnetic field H when B is 90% br; hcj is coercivity.

(2) The relative magnetic permeability is Br/Hcb; wherein Br is remanence, hcb is magnetic induction coercive force, and when the inflection point exists in the B-H curve, the magnetic permeability takes a value before the inflection point.

(3) Max (Hcj) -Min (Hcj): the maximum coercivity minus the minimum coercivity in the same batch of products is poor in magnetic uniformity if greater than 1.5 kOe.

TABLE 7

	Relative permeability of	Squareness (%)	Max(Hcj)-Min(Hcj)/(kOe)
				Example 1	1.02	99	0.2
Example 2	1.02	99	0.3
				Example 3	1.02	99	0.2
Example 4	1.02	99	0.3
				Example 5	1.02	99	0.2
Example 6	1.02	99	0.3
				Example 7	1.02	99	0.2
Example 8	1.01	99	0.2
				Example 9	1.02	99	0.2
Example 10	1.02	99	0.3
				Example 11	1.02	99	0.33
Example 12	1.02	99	0.25
				Comparative example 1	1.05	95	0.5
Comparative example 2	1.05	94	0.5
				Comparative example 3	1.04	99	0.4
Comparative example 4	1.04	97	0.5
				Comparative example 5	1.04	96	0.6
Comparative example 6	1.05	99	0.7
				Comparative example 7	1.04	99	0.7
Comparative example 8	1.05	99	0.8

The test results of the consistency of magnetic properties and magnetic properties in tables 6 and 7 were analyzed as follows:

1) Comparative example 1: based on example 1, the Cu content was reduced to be insufficient, and other conditions were unchanged.

At normal temperature, the R-T-B permanent magnet material of comparative example 1 was reduced in Hcb, hcj, hk, hk/Hcj and HD5 relative to example 1. At high temperature, compared with the embodiment 1, the R-T-B permanent magnet material in the comparative example 1 has larger absolute value of Br temperature coefficient alpha and poorer high temperature performance. Moreover, the relative magnetic permeability is larger, the squareness is lower, and the consistency of the magnet performance is poorer.

2) Comparative example 2: based on example 1, the Cu content was increased to be excessive, and the other conditions were unchanged.

At normal temperature, the R-T-B permanent magnet material of comparative example 2 was reduced in Hcb, hcj, (BH) max, hk, hk/Hcj and HD5 relative to example 1. At high temperature, compared with the embodiment 1, the R-T-B permanent magnet material in the comparative example 2 has larger absolute value of Br temperature coefficient alpha and poorer high temperature performance. Moreover, the relative magnetic permeability is larger, the squareness is lower, and the consistency of the magnet performance is poorer.

3) Comparative examples 3 to 4: based on example 2, the Ga content was reduced to be insufficient, and other conditions were unchanged.

At normal temperature, the R-T-B permanent magnet materials of comparative examples 3 to 4 were reduced in Hcb, hcj, hk, hk/Hcj and HD5 relative to example 2. At high temperature, compared with the embodiment 2, the R-T-B permanent magnet material in the comparative example 3 has larger absolute value of Br temperature coefficient alpha and poorer high temperature performance. Moreover, the relative magnetic permeability is larger, the squareness is lower, and the consistency of the magnet performance is poorer.

4) Comparative example 5: based on example 3, the Cu content was increased to be excessive, the Ga content was decreased to be insufficient, and other conditions were unchanged.

At normal temperature, the R-T-B permanent magnet material of comparative example 5 was reduced in both Br, hcb, hcj, (BH) max, hk, hk/Hcj and HD5 relative to example 3. At high temperature, compared with example 3, the R-T-B permanent magnet material in comparative example 5 has larger absolute value of Br temperature coefficient alpha and poorer high temperature performance. Moreover, the relative magnetic permeability is larger, the squareness is lower, and the consistency of the magnet performance is poorer.

5) Comparative example 6: based on example 2, the content of B was reduced to be insufficient, and other conditions were unchanged.

At normal temperature, both of Hcb, hcj, hk and HD5 of the R-T-B permanent magnet material in comparative example 6 were reduced relative to example 2. At high temperature, compared with example 2, the R-T-B permanent magnet material in comparative example 6 has larger absolute value of Br temperature coefficient alpha and poorer high temperature performance. Moreover, the relative permeability is large, and the uniformity of the magnet performance is poor.

6) Comparative example 7: based on example 2, zr and N were not added, and the other conditions were unchanged.

At normal temperature, the R-T-B permanent magnet material of comparative example 7 was reduced in Hcj, hk and HD5 relative to example 2. At high temperature, compared with example 2, the R-T-B permanent magnet material in comparative example 7 has larger absolute value of Br temperature coefficient alpha and poorer high temperature performance. Moreover, the relative permeability is large, and the uniformity of the magnet performance is poor.

7) Comparative example 8: based on example 5, ti and Nb were not added, and other conditions were unchanged.

At normal temperature, the R-T-B permanent magnet material of comparative example 8 was reduced in Hcj, hk and HD5 relative to example 5. At high temperature, compared with example 5, the R-T-B permanent magnet material in comparative example 8 has larger absolute value of Br temperature coefficient alpha and poorer high temperature performance. Moreover, the relative permeability is large, and the uniformity of the magnet performance is poor.

4. And (3) testing the content of heavy rare earth: the ICP was used to test the contents of heavy rare earth elements at different positions on the surface of the R-T-B permanent magnet materials in examples 1 to 12, and the results show that the difference of the contents of the heavy rare earth elements is only 0.01 to 0.07mas percent, which is almost the same. Therefore, the R-T-B permanent magnet materials in examples 1 to 12 have uniform distribution of heavy rare earth elements and uniform performance.

Claims

1. The R-T-B permanent magnet material is characterized by comprising the following components in percentage by mass:

r, 28.5-32.0 mas%; r is a rare earth element containing at least Nd;

Cu，0.16~0.20mas%；

Ga，0.60~0.80mas%；

B，≥0.99mas%；

Fe，64~68mas%；

Zr，0.25~0.44mas%；

n, 0.20-0.60 mas; the N is one or more of Ti, nb and Hf;

when the N contains Ti, the content of the Ti is 0.10mas% or 0.29-0.55 mas%;

when the N contains Nb, the content of the Nb is 0.25-0.51 mas; the percentages are the mass percentages of the components in mass of the total mass of the R-T-B permanent magnet material;

the R-T-B permanent magnet material comprises a rare earth-rich phase, boride and main phase grains;

the rare earth-rich phase is a neodymium-rich phase; the boride is one or more of ZrB, hfB, nbB and TiB; the main phase crystal grain is Nd ₂ Fe ₁₄ A B grain;

the rare earth-rich phase is distributed with Cu and Ga; wherein the distribution amount of Cu in the rare earth-rich phase is more than 95% of Cu; the distribution amount of Ga in the rare earth-rich phase is more than 95% of Ga;

Ga is distributed in the main phase crystal grains; the distribution amount of Ga in the main phase grains is 5% or less of Ga;

zr is distributed at the grain boundary of the rare earth-rich phase and the boride, and the Zr distributed at the grain boundary is combined with B to form the boride; the Zr distribution amount at the grain boundary is more than 95% of the Zr; wherein Zr is Fe which replaces the main phase crystal grain and is distributed in the main phase crystal grain; the Zr distribution amount of Fe in the substituted main phase crystal grain is below 5% of the Zr;

n is distributed at the grain boundary of the rare earth-rich phase and the boride, and the N and the B distributed at the grain boundary are combined into the boride; the distribution amount of the N at the grain boundary is more than 95% of the N; wherein, N is Fe which replaces the main phase crystal grain and is distributed in the main phase crystal grain; the distribution amount of N of Fe in the substituted main phase crystal grain is below 5% of the N.

2. The R-T-B permanent magnet material according to claim 1, wherein the R content is 29.0 to 31.0 mas; the weight percentage is that the R accounts for the total weight of the R-T-B permanent magnet material.

3. The R-T-B permanent magnet material according to claim 2, wherein the R content is 29.74 to 29.95 mas; the weight percentage is that the R accounts for the total weight of the R-T-B permanent magnet material.

4. The R-T-B permanent magnet material according to claim 2, wherein the R content is 29.74mas, 29.89mas, 29.90 mas, 29.95mas, 30.13mas, 30.28mas, 30.56mas% or 30.99 mas; the weight percentage is that the R accounts for the total weight of the R-T-B permanent magnet material.

5. The R-T-B permanent magnet material according to claim 2, wherein the Nd content is 29.5 to 31.0 mas; the mass percentage of Nd is the mass percentage of the total mass of the R-T-B permanent magnet material.

6. The R-T-B based permanent magnet material according to claim 5, wherein the Nd content is 29.74 to 30.99 mas; the mass percentage of Nd is the mass percentage of the total mass of the R-T-B permanent magnet material.

7. The R-T-B permanent magnet material according to claim 6, wherein the Nd content is 29.74mas, 29.89mas, 29.90 mas, 29.95mas, 30.13mas, 30.28mas% or 30.99 mas; the mass percentage of Nd is the mass percentage of the total mass of the R-T-B permanent magnet material.

8. The R-T-B permanent magnet material according to claim 1, wherein R further comprises Pr.

9. The R-T-B based permanent magnet material according to claim 8, wherein the Pr content is 0 to 0.3 mas; the mass percentage of Pr is the mass percentage of the total mass of the R-T-B permanent magnet material.

10. The R-T-B-based permanent magnet material according to claim 9, wherein the Pr content is 0.28 mas; the mass percentage of Pr is the mass percentage of the total mass of the R-T-B permanent magnet material.

11. The R-T-B permanent magnet material according to claim 1, wherein the Cu content is 0.17-0.20 mas; the percentage is the mass percentage of the Cu in the total mass of the R-T-B permanent magnet material.

12. The R-T-B-based permanent magnet material according to claim 11, wherein the Cu content is 0.18mas% or 0.19mas%; the percentage is the mass percentage of the Cu in the total mass of the R-T-B permanent magnet material.

13. The R-T-B based permanent magnet material according to claim 1, wherein the Ga content is 0.62 to 0.78 mas; the percentage is the mass percentage of the Ga in the total mass of the R-T-B permanent magnet material.

14. The R-T-B-based permanent magnet material according to claim 13, wherein the Ga content is 0.64mas%, 0.65mas% or 0.75mas%; the percentage is the mass percentage of the Ga in the total mass of the R-T-B permanent magnet material.

15. The R-T-B based permanent magnet material according to claim 1, wherein the B content is 0.99 to 1.15 mas; the weight percentage is that the mass of the B accounts for the total mass of the R-T-B permanent magnet material.

16. The R-T-B permanent magnet material according to claim 15, wherein the B content is 1.00 to 1.05 mas; the weight percentage is that the mass of the B accounts for the total mass of the R-T-B permanent magnet material.

17. The R-T-B-based permanent magnet material according to claim 16, wherein the B content is 1.01mas% or 1.02 mas; the weight percentage is that the mass of the B accounts for the total mass of the R-T-B permanent magnet material.

18. The R-T-B permanent magnet material according to claim 1, wherein the ratio of the atomic percent of R to the atomic percent of B is less than 2.50.

19. The R-T-B series permanent magnet material according to claim 18, wherein the ratio of the atomic percent of R to the atomic percent of B is 0.45 or 2.32.

20. The R-T-B-based permanent magnet material according to claim 1, wherein the ratio of the atomic percent of Fe to the atomic percent of B is less than 14.

21. The R-T-B series permanent magnet material according to claim 20, wherein the ratio of the atomic percent of Fe to the atomic percent of B is 0.08.

22. The R-T-B permanent magnet material according to claim 1, wherein the Fe content is 64.3-67.5 mas%; the weight percentage is that the Fe accounts for the total weight of the R-T-B permanent magnet material.

23. The R-T-B permanent magnet material according to claim 1, wherein the Fe content is 64.38mas, 64.59mas, 64.79 mas, 65.48mas, 65.81mas, 65.84mas, 66.21mas, 66.55mas, 67.00mas, 67.04mas% or 67.60 mas; the weight percentage is that the Fe accounts for the total weight of the R-T-B permanent magnet material.

24. The R-T-B permanent magnet material according to claim 1, wherein the Zr content is 0.26-0.38 mas; the weight percentage is that the Zr accounts for the total weight of the R-T-B permanent magnet material.

25. The R-T-B-based permanent magnet material according to claim 24, wherein the Zr content is 0.28 mas; the weight percentage is that the Zr accounts for the total weight of the R-T-B permanent magnet material.

26. The R-T-B permanent magnet material according to claim 1, wherein the N content is 0.28 to 0.52 mas; the weight percentage is that the mass of the N accounts for the total mass of the R-T-B permanent magnet material.

27. The R-T-B permanent magnet material according to claim 26, wherein the N content is 0.29mas, 0.31mas, 0.33mas, 0.39mas or 0.51 mas; the weight percentage is that the mass of the N accounts for the total mass of the R-T-B permanent magnet material.

28. The R-T-B based permanent magnet material according to claim 1, wherein when the N contains Ti, the Ti content is 0.30 to 0.40 mas; the weight percentage is that the Ti accounts for the total weight of the R-T-B permanent magnet material.

29. The R-T-B system permanent magnet material according to claim 28, wherein when the N contains Ti, the Ti content is 0.31 mas; the weight percentage is that the Ti accounts for the total weight of the R-T-B permanent magnet material.

30. The R-T-B permanent magnet material according to claim 1, wherein when N contains Nb, the content of Nb is 0.25 to 0.40 mas; the weight percentage is that the weight percentage of the Nb accounts for the total weight of the R-T-B permanent magnet material.

31. The R-T-B-based permanent magnet material according to claim 30, wherein when the N contains Nb, the content of Nb is 0.29mas, 0.33mas% or 0.39mas%; the weight percentage is that the weight percentage of the Nb accounts for the total weight of the R-T-B permanent magnet material.

32. The R-T-B permanent magnet material according to claim 1, wherein when the N contains Hf, the content of Hf is 0 to 0.8mas% and not 0mas%; the weight percentage is that the weight percentage of the Hf accounts for the total weight of the R-T-B permanent magnet material.

33. The R-T-B system permanent magnet material according to claim 1, wherein N is Ti.

34. The R-T-B based permanent magnet material according to claim 33, wherein the Ti content is 0.29 to 0.32 mas; the weight percentage is that the Ti accounts for the total weight of the R-T-B permanent magnet material.

35. The R-T-B-based permanent magnet material according to claim 34, wherein the Ti content is 0.29mas% or 0.31 mas; the weight percentage is that the Ti accounts for the total weight of the R-T-B permanent magnet material.

36. The R-T-B permanent magnet material according to claim 1, wherein N is Nb.

37. The R-T-B based permanent magnet material according to claim 36, wherein the Nb content is 0.30 to 0.51 mas; the weight percentage is that the weight percentage of the Nb accounts for the total weight of the R-T-B permanent magnet material.

38. The R-T-B-based permanent magnet material according to claim 37, wherein the Nb content is 0.33mas%, 0.39mas% or 0.51mas%; the weight percentage is that the weight percentage of the Nb accounts for the total weight of the R-T-B permanent magnet material.

39. The R-T-B system permanent magnet material according to claim 1, wherein N is Ti and Nb.

40. The R-T-B permanent magnet material according to claim 39, wherein the Ti content is 0.10 mas; the weight percentage is that the Ti accounts for the total weight of the R-T-B permanent magnet material.

41. The R-T-B permanent magnet material according to claim 39, wherein the Nb content is 0.25-0.35 mas; the weight percentage is that the weight percentage of the Nb accounts for the total weight of the R-T-B permanent magnet material.

42. The R-T-B permanent magnet material according to claim 41, wherein the Nb content is 0.29 mas; the weight percentage is that the weight percentage of the Nb accounts for the total weight of the R-T-B permanent magnet material.

43. The R-T-B permanent magnet material according to claim 39, wherein N is 0.10mas% Ti and 0.29mas% Nb.

44. The R-T-B system permanent magnet material according to claim 1, wherein the R-T-B system permanent magnet material further comprises RH, which is a heavy rare earth element.

45. The R-T-B permanent magnet material according to claim 44, wherein when the R-T-B permanent magnet material comprises RH, the R-T-B permanent magnet material further comprises a shell layer of primary phase grains.

46. The R-T-B permanent magnet material according to claim 45, wherein the shell layer of the main phase grains comprises RH ₂ Fe ₁₄ And B grains.

47. The R-T-B permanent magnet material according to claim 46, wherein RH is distributed in the shell of the primary phase grains; the distribution amount of the RH in the shell layer of the main phase crystal grain is more than 95% of the RH.

48. An R-T-B system permanent magnet according to claim 44 wherein the RH species includes one or more of Dy, tb and Ho.

49. The R-T-B permanent magnet material according to claim 48, wherein the RH is 1.05-3.20 mas; the percentage is the mass percentage of the RH to the total mass of the R-T-B permanent magnet material.

50. The R-T-B permanent magnet material according to claim 49, wherein the RH content is 1.20-2.80 mas; the percentage is the mass percentage of the RH to the total mass of the R-T-B permanent magnet material.

51. The R-T-B permanent magnet material according to claim 50, wherein the RH is 1.25mas, 1.60mas, 2.40mas% or 2.65 mas; the percentage is the mass percentage of the RH to the total mass of the R-T-B permanent magnet material.

52. The R-T-B permanent magnet material according to claim 48, wherein when the RH comprises Dy, the Dy content is 1.05-1.6 mas; the Dy accounts for the mass percent of the total mass of the R-T-B permanent magnet material.

53. The R-T-B-based permanent magnet material according to claim 52, wherein when said RH includes Dy, the content of Dy is 1.25mas% or 1.3mas%; the Dy accounts for the mass percent of the total mass of the R-T-B permanent magnet material.

54. The R-T-B permanent magnet material according to claim 48, wherein when the RH comprises Tb, the Tb content is 1.05-1.6 mas; the weight percentage of the Tb is the weight percentage of the total weight of the R-T-B permanent magnet material.

55. The R-T-B series permanent magnet material according to claim 54, wherein when said RH comprises Tb, said Tb is present in an amount of 1.25mas% or 1.3mas%; the weight percentage of the Tb is the weight percentage of the total weight of the R-T-B permanent magnet material.

56. The R-T-B series permanent magnet material according to claim 48, wherein RH is Tb.

57. The R-T-B permanent magnet material according to claim 56, wherein the Tb content is 1.05-1.20 mas; the weight percentage is that the weight percentage of Tb accounts for the total weight of the R-T-B permanent magnet material.

58. The R-T-B permanent magnet material according to claim 48, wherein RH is Dy.

59. The R-T-B system permanent magnet material according to claim 58, wherein the Dy content is 1.25-1.80 mas; the mass percentage of Dy is the mass percentage of the total mass of the R-T-B permanent magnet material.

60. The R-T-B system permanent magnet material according to claim 59, wherein the Dy content is 1.60 mas; the mass percentage of Dy is the mass percentage of the total mass of the R-T-B permanent magnet material.

61. The R-T-B permanent magnet material according to claim 48, wherein RH is Tb or Dy.

62. The R-T-B based permanent magnet material according to claim 61, wherein the Tb is contained in an amount of 1.05 to 1.20 mas; the weight percentage is that the weight percentage of Tb accounts for the total weight of the R-T-B permanent magnet material.

63. The R-T-B system permanent magnet material according to claim 61, wherein the Dy content is 1.25 to 1.80 mas; the mass percentage of Dy is the mass percentage of the total mass of the R-T-B permanent magnet material.

64. The R-T-B system permanent magnet material according to claim 63, wherein the Dy content is 1.60 mas; the mass percentage of Dy is the mass percentage of the total mass of the R-T-B permanent magnet material.

65. The R-T-B permanent magnet material according to claim 61, wherein the RH is 1.05mas% Tb and 1.60mas% Dy.

66. The R-T-B system permanent magnet material according to claim 1, wherein the R-T-B system permanent magnet material further comprises Co.

67. The R-T-B series permanent magnet material according to claim 66, wherein when the R-T-B series permanent magnet material comprises Co, the Co replaces Fe in the primary phase grains and is distributed inside the primary phase grains; the distribution amount of Co substituting Fe in the main phase crystal grain is more than 95% of Co; co is also distributed at the grain boundary of the rare earth-rich phase and boride; the Co distribution amount at the grain boundary is 5% or less of the Co.

68. The R-T-B series permanent magnet material of claim 66, wherein the Co content is 1.50-2.00 mas%, and the mass percentage of the Co is the mass percentage of the total mass of the R-T-B series permanent magnet material.

69. The R-T-B series permanent magnet material according to claim 68, wherein the Co content is 1.55 mas; the mass percentage of the Co is the mass percentage of the total mass of the R-T-B permanent magnet material.

70. The R-T-B series permanent magnet material according to claim 66 wherein when the R-T-B series permanent magnet material comprises Co, the ratio of the sum of the atomic percentages of Co and Fe to the atomic percentage of B is less than 14.

71. The R-T-B system permanent magnet material according to claim 1, wherein the R-T-B system permanent magnet material comprises the following components in mass content:

R,29.0 to 31.0mas%; r is a rare earth element containing at least Nd;

Cu，0.16~0.20mas%；

Ga，0.60~0.80mas%；

B，0.99~1.15mas%；

Fe，64.3~67.5mas%；

Zr，0.26~0.38mas%；

n, 0.28-0.52 mas; the N is one or more of Ti, nb and Hf;

72. The R-T-B system permanent magnet material according to claim 1, wherein the R-T-B system permanent magnet material comprises the following components in mass content:

r, 29.74-29.95 mas; r is a rare earth element containing at least Nd;

Cu，0.16~0.20mas%；

Ga，0.62~0.78mas%；

B，1.00~1.05mas%；

Fe，64.3~67.5mas%；

Zr，0.26~0.38mas%；

n, 0.28-0.52 mas; the N is one or more of Ti, nb and Hf;

73. The R-T-B system permanent magnet material according to claim 1, wherein the R-T-B system permanent magnet material comprises the following components in mass content:

r, 28.5-32.0 mas%; r is a rare earth element containing at least Nd;

Cu，0.16~0.20mas%；

Ga，0.60~0.80mas%；

B，≥0.99mas%；

Fe，64~68mas%；

Zr，0.25~0.44mas%；

n, 0.20-0.60 mas; n is one or more of Ti, nb and Hf;

RH, 1.05-3.20 mas; RH is one or more of Dy, tb and Ho;

74. The R-T-B system permanent magnet material according to claim 1, wherein the R-T-B system permanent magnet material comprises the following components in mass content:

R, 28.5-32.0 mas%; r is a rare earth element containing at least Nd;

Cu，0.16~0.20mas%；

Ga，0.60~0.80mas%；

B，≥0.99mas%；

Fe，64~68mas%；

Zr，0.25~0.44mas%；

n, 0.20-0.60 mas; n is one or more of Ti, nb and Hf;

RH, 1.05-3.20 mas; RH is one or more of Dy, tb and Ho;

Co，1.50~2.00mas%；

75. A method for preparing an R-T-B permanent magnet material according to any one of claims 1 to 74, comprising the steps of: the main alloy and the auxiliary alloy are prepared by a double-alloy method;

76. The method for producing an R-T-B permanent magnet according to claim 75, wherein the mass ratio of the main alloy to the auxiliary alloy is (9 to 99): 1.

77. the method of claim 76, wherein the mass ratio of the main alloy to the auxiliary alloy is (16-33): 1.

78. the method of claim 77, wherein the mass ratio of said main alloy to said auxiliary alloy is 18:1, 19:1, 24:1 or 32:1.

79. The method of claim 75, wherein in the master alloy, R is a rare earth element containing at least Nd.

80. The method for preparing an R-T-B permanent magnet material according to claim 75, wherein the content of R in the main alloy is 30.0-32 mas; the percentage is the mass percentage of the R in the total mass of the main alloy.

81. The method of claim 80, wherein the R is present in an amount of 30.1, 30.16, 30.4, 30.5, 31.3, or 31.5; the percentage is the mass percentage of the R in the total mass of the main alloy.

82. The method for preparing a R-T-B series permanent magnet material according to claim 79, wherein the Nd content is 30.0-31.5 mas%; the percentage is the mass percentage of the Nd in the total mass of the main alloy.

83. The method of claim 82, wherein the Nd is present in an amount of 30.1, 30.16, 30.4, 30.5, or 31.3mas%; the percentage is the mass percentage of the Nd in the total mass of the main alloy.

84. The method for preparing an R-T-B permanent magnet material according to claim 75, wherein the Cu content in the master alloy is 0.1-0.22 mas; the percentage is the mass percentage of the Cu in the total mass of the main alloy.

85. The method of claim 84, wherein the Cu is present in the master alloy in an amount of 0.16, 0.18, 0.19, or 0.21 mas; the percentage is the mass percentage of the Cu in the total mass of the main alloy.

86. The method for preparing an R-T-B permanent magnet material according to claim 75, wherein the Ga content in the main alloy is 0.36-0.60 mas; the percentage is the mass percentage of the Ga in the total mass of the main alloy.

87. The method for preparing an R-T-B system permanent magnet material according to claim 86, wherein the Ga content is 0.37mas, 0.38mas, 0.40mas, 0.41mas, 0.50mas, 0.55mas, 0.556mas% or 0.56 mas; the percentage is the mass percentage of the Ga in the total mass of the main alloy.

88. The method for preparing an R-T-B permanent magnet material according to claim 75, wherein the content of B in the master alloy is 1.00-1.05 mas; the percentage is the mass percentage of the mass of the B in the total mass of the main alloy.

89. The method of claim 88, wherein the B content is 1.02mas, 1.03mas, or 1.04 mas; the percentage is the mass percentage of the mass of the B in the total mass of the main alloy.

90. The method for preparing an R-T-B permanent magnet material according to claim 75, wherein the Fe content in the main alloy is 65.5-68.5 mas%; the percentage is the mass percentage of the Fe in the total mass of the main alloy.

91. The method for preparing an R-T-B permanent magnet material according to claim 90, wherein the Fe content is 65.60, 65.97, 66.24, 66.26, 66.31, 67.04, 67.51, 67.57 or 68.07; the percentage is the mass percentage of the Fe in the total mass of the main alloy.

92. The method for preparing an R-T-B permanent magnet material according to claim 75, wherein the Zr content in the main alloy is 0.15-0.3 mass%; the weight percentage is that the Zr accounts for the total weight of the main alloy.

93. The method for preparing a R-T-B series permanent magnet material of claim 92, wherein the Zr content is 0.17mas% or 0.21 mas; the weight percentage is that the Zr accounts for the total weight of the main alloy.

94. The method for preparing an R-T-B permanent magnet material according to claim 75, wherein the content of N in the main alloy is 0.3-0.55 mas; the percentage is the mass percentage of the N in the total mass of the main alloy.

95. The method of claim 94, wherein the N is 0.306mas, 0.33mas, 0.345mas, 0.405mas, 0.412mas% or 0.531 mas; the percentage is the mass percentage of the N in the total mass of the main alloy.

96. The method of claim 94, wherein when N comprises Ti, the Ti content is 0.10-0.35 mas; the percentage is the mass percentage of the Ti in the total mass of the main alloy.

97. The method of claim 96, wherein the Ti is 0.11mas, 0.306mas or 0.33 mas; the percentage is the mass percentage of the Ti in the total mass of the main alloy.

98. The method for preparing an R-T-B based permanent magnet material according to claim 94, wherein when N comprises Nb, the Nb content is 0.3 to 0.55 mas; the percentage is the mass percentage of the Nb in the total mass of the main alloy.

99. The method for preparing an R-T-B permanent magnet according to claim 98, wherein the Nb content is 0.345mas, 0.405mas% or 0.531 mas; the percentage is the mass percentage of the Nb in the total mass of the main alloy.

100. The method of preparing a R-T-B series permanent magnet material according to claim 94, wherein N is Ti and Nb.

101. The method for producing an R-T-B based permanent magnet material according to claim 100, wherein N is 0.11mas% Ti and 0.30mas% Nb.

102. The method of claim 75, wherein the master alloy further comprises RH, which is a heavy rare earth element.

103. The method for preparing an R-T-B series permanent magnet material according to claim 102, wherein the kind of RH includes one or more of Dy, tb and Ho.

104. The method for preparing an R-T-B based permanent magnet material according to claim 102, wherein the RH is 0.75-2.00 mas; the percentage is the mass percentage of the RH to the total mass of the main alloy.

105. The method of claim 104, wherein the RH is present in an amount of 0.78mas, 1.19mas, or 1.97 mas; the percentage is the mass percentage of the RH to the total mass of the main alloy.

106. The method for manufacturing an R-T-B based permanent magnet material according to claim 103, wherein when said RH includes Dy, the content of Dy is 0.75-1.6 mas; the mass percentage of Dy is the mass percentage of Dy in the total mass of the main alloy.

107. The method for preparing an R-T-B system permanent magnet material according to claim 106, wherein the Dy content is 0.78mas; the mass percentage of Dy is the mass percentage of Dy in the total mass of the main alloy.

108. The method for preparing an R-T-B based permanent magnet material according to claim 103, wherein when said RH includes Tb, the content of Tb is 1.05-1.6 mas; the weight percentage is that of the Tb to the total weight of the main alloy.

109. The method for preparing an R-T-B series permanent magnet material according to claim 108, wherein the content of Tb is 1.19 mas; the weight percentage is that of the Tb to the total weight of the main alloy.

110. The method of claim 103, wherein said RH is Tb and Dy.

111. The method for preparing an R-T-B series permanent magnet material according to claim 110, wherein said RH is 0.78mas% Tb and 1.19mas% Dy.

112. The method of claim 75, wherein the master alloy further comprises Co.

113. The method for preparing an R-T-B based permanent magnet material according to claim 112, wherein the Co content is 1.50-1.80 mas; the mass percentage of the Co is the mass percentage of the total mass of the main alloy.

114. The method for preparing an R-T-B series permanent magnet material according to claim 113, wherein the Co content is 1.60mas, 1.63mas% or 1.64 mas; the mass percentage of the Co is the mass percentage of the total mass of the main alloy.

115. The method for preparing an R-T-B permanent magnet material according to claim 75, wherein the main alloy comprises the following components in mass content:

r, 30.0-31.5 mas%; r is a rare earth element containing at least Nd;

Cu，0.1~0.22mas%；

Ga，0.36~0.60mas%；

B，1.00~1.05mas%；

Fe，65.5~68.5mas%；

Zr，0.15~0.3mas%；

n, 0.3-0.55 mas; the N is one or more of Ti, nb and Hf;

116. The method for preparing an R-T-B permanent magnet material according to claim 75, wherein the main alloy comprises the following components in mass content:

R, 30.0-31.5 mas%; r is a rare earth element containing at least Nd;

Cu，0.1~0.22mas%；

Ga，0.36~0.60mas%；

B，1.00~1.05mas%；

Fe，65.5~68.5mas%；

Zr，0.15~0.3mas%；

n, 0.3-0.55 mas; ti in the N is 0.10-0.35 mas; nb, 0.3-0.55 mas;

117. The method for preparing an R-T-B permanent magnet material according to claim 75, wherein the main alloy comprises the following components in mass content:

r, 30.0-31.5 mas%; r is a rare earth element containing at least Nd;

Cu，0.1~0.22mas%；

Ga，0.36~0.60mas%；

B，1.00~1.05mas%；

Fe，65.5~68.5mas%；

Zr，0.15~0.3mas%；

n, 0.3-0.55 mas; ti in the N is 0.10-0.35 mas; nb, 0.3-0.55 mas;

RH, 0.75-2.00 mas; the RH comprises Tb and/or Dy;

118. The method for preparing an R-T-B permanent magnet material according to claim 75, wherein the main alloy comprises the following components in mass content:

r, 30.0-31.5 mas%; r is a rare earth element containing at least Nd;

Cu，0.1~0.22mas%；

Ga，0.36~0.60mas%；

B，1.00~1.05mas%；

Fe，65.5~68.5mas%；

Zr，0.15~0.3mas%；

n, 0.3-0.55 mas; ti in the N is 0.10-0.35 mas; nb, 0.3-0.55 mas;

RH, 0.75-2.00 mas; the RH comprises Tb and/or Dy;

Co，1.50~1.80mas%；

119. The method of claim 75, wherein in the auxiliary alloy, R is a rare earth element containing at least Nd.

120. The method for preparing an R-T-B based permanent magnet material according to claim 119, wherein the content of R is 25.0 to 40.0mas%; the percentage is the mass percentage of the R in the total mass of the auxiliary alloy.

121. The method for preparing an R-T-B based permanent magnet material according to claim 120, wherein the R content is 25.0mas, 30.0mas, 35.0mas% or 40.0 mas; the percentage is the mass percentage of the R in the total mass of the auxiliary alloy.

122. The method for preparing an R-T-B based permanent magnet material according to claim 119, wherein the Nd content is 20.0 to 30.0mas%; the percentage is the mass percentage of the Nd in the total mass of the auxiliary alloy.

123. The method for preparing an R-T-B series permanent magnet material according to claim 122, wherein the Nd content is 25.0 mas; the percentage is the mass percentage of the Nd in the total mass of the auxiliary alloy.

124. The method of claim 119, wherein R further comprises Pr.

125. The method for preparing an R-T-B based permanent magnet material according to claim 124, wherein the Pr is present in an amount of 5.0 to 10.0 mas; the mass percentage of Pr is the mass percentage of the total mass of the auxiliary alloy.

126. The method for preparing an R-T-B series permanent magnet material according to claim 125, wherein the Pr content is 7.0 mas; the mass percentage of Pr is the mass percentage of the total mass of the auxiliary alloy.

127. The method for preparing an R-T-B permanent magnet material according to claim 75, wherein the Cu content in the auxiliary alloy is 2.50-3.50 mas; the percentage is the mass percentage of the Cu in the total mass of the auxiliary alloy.

128. The method for preparing an R-T-B series permanent magnet material according to claim 127, wherein the Cu content is 3.00 mas; the percentage is the mass percentage of the Cu in the total mass of the auxiliary alloy.

129. The method for preparing an R-T-B permanent magnet material according to claim 75, wherein the Ga content in the auxiliary alloy is 4.50-6.00 mas; the percentage is the mass percentage of the Ga in the total mass of the auxiliary alloy.

130. The method of claim 129, wherein the Ga is present in an amount of 5.00mas% or 5.50mas%; the percentage is the mass percentage of the Ga in the total mass of the auxiliary alloy.

131. The method for preparing an R-T-B permanent magnet material according to claim 75, wherein the content of B in the auxiliary alloy is 0.30-0.70 mas; the weight percentage is that the weight percentage of the B accounts for the total weight of the auxiliary alloy.

132. The method for preparing an R-T-B based permanent magnet material according to claim 131, wherein the B content is 0.40mas, 0.50mas% or 0.60 mas; the weight percentage is that the weight percentage of the B accounts for the total weight of the auxiliary alloy.

133. The method for preparing an R-T-B permanent magnet material according to claim 75, wherein the Fe content in the auxiliary alloy is 38-66 mas; the percentage is the mass percentage of the Fe in the total mass of the main alloy.

134. The method for preparing an R-T-B permanent magnet material according to claim 133, wherein the Fe content is 38mas, 39.6mas, 44.2mas, 44.6mas, 63mas, 63.9mas, 64mas, 64.6mas% or 66 mas; the percentage is the mass percentage of the Fe in the total mass of the main alloy.

135. The method for preparing an R-T-B permanent magnet material according to claim 75, wherein the Zr content in the auxiliary alloy is 3.00-6.00 mas; the percentage is the mass percentage of the N in the total mass of the auxiliary alloy.

136. The method for preparing an R-T-B based permanent magnet material according to claim 135, wherein the Zr content is 3.00mas, 5.00mas, 5.40mas, 5.50mas% or 5.60 mas; the percentage is the mass percentage of the N in the total mass of the auxiliary alloy.

137. The method of claim 75, wherein the types of elements in the secondary alloy further include N; the N is one or more of Ti, nb and Hf.

138. The method of claim 75, wherein the auxiliary alloy further comprises RH, which is a heavy rare earth element.

139. The method for preparing a R-T-B series permanent magnet material according to claim 138, wherein the RH comprises one or more of Dy, tb and Ho.

140. The method for preparing a R-T-B series permanent magnet material of claim 138, wherein the RH is in a content of 10.00-25.00 mas; the percentage is the mass percentage of the RH to the total mass of the auxiliary alloy.

141. The method for preparing an R-T-B series permanent magnet material according to claim 140, wherein the RH is present in an amount of 10.00mas% or 15.00mas%; the percentage is the mass percentage of the RH to the total mass of the auxiliary alloy.

142. The method for preparing an R-T-B based permanent magnet material according to claim 139, wherein when said RH includes Dy, the content of Dy is 10.00-25.00 mas; the Dy accounts for the mass percent of the total mass of the auxiliary alloy.

143. The method for preparing an R-T-B series permanent magnet material according to claim 142, wherein the Dy content is 15mas%; the Dy accounts for the mass percent of the total mass of the auxiliary alloy.

144. The method for preparing an R-T-B based permanent magnet material according to claim 139, wherein when said RH comprises Tb, the content of Tb is 10.00-20.00 mas; the weight percentage of the Tb is the weight percentage of the total weight of the auxiliary alloy.

145. The method for preparing an R-T-B permanent magnet material according to claim 75, wherein the auxiliary alloy comprises the following components in mass content:

r,25.0 to 40.0mas%; r is a rare earth element containing at least Nd;

Cu，2.50~3.50mas%；

Ga，4.50~6.00mas%；

B，0.30~0.70mas%；

Fe，38~66mas%；

Zr，3.00~6.00mas%；

146. The method for preparing an R-T-B permanent magnet material according to claim 75, wherein the auxiliary alloy comprises the following components in mass content:

R,25.0 to 40.0mas%; in the R, nd is 20.0-30.0 mas; pr, 5.0-10.0 mas%;

Cu，2.50~3.00mas%；

Ga，5.00~5.50mas%；

B，0.40~0.60mas%；

Fe，38~66mas%；

Zr，3.00~6.00mas%；

RH, 10.00-25.00 mas; the RH comprises Tb and/or Dy;

147. The method for preparing an R-T-B permanent magnet material according to claim 75, wherein the auxiliary alloy comprises the following components in mass content:

r,25.0 to 40.0mas%; in the R, nd is 20.0-30.0 mas; pr, 5.0-10.0 mas%;

Cu，2.50~3.00mas%；

Ga，5.00~5.50mas%；

B，0.40~0.60mas%；

Fe，38~66mas%；

Zr，3.00~6.00mas%；

RH, 10.00-25.00 mas; in the RH, tb is 10.00-20.00 mas; dy, 10.00-25.00 mas;

148. The method for preparing an R-T-B permanent magnet material according to any one of claims 75 to 147, wherein the double alloy method comprises the steps of sequentially sintering and aging mixed alloy powders of the main alloy and the auxiliary alloy.

149. The method for preparing an R-T-B system permanent magnet according to claim 148, wherein the mixed alloy powder is obtained by mixing a main alloy and an auxiliary alloy.

150. The method of claim 149, wherein the mixing is performed uniformly.

151. The method for preparing a R-T-B system permanent magnet according to claim 150, wherein the mixing is performed by mixing the main alloy and the auxiliary alloy and then subjecting the mixture to hydrogen crushing and air flow grinding, or by mixing the main alloy and the auxiliary alloy after hydrogen crushing and air flow grinding, respectively.

152. The method for preparing an R-T-B permanent magnet material according to claim 151, wherein the hydrogen is broken into saturated hydrogen absorption under a hydrogen pressure of 0.067 to 0.098MPa, and dehydrogenated at 480 ℃ to 580 ℃.

153. The method for preparing a R-T-B series permanent magnet material according to claim 152, wherein the hydrogen is broken into saturated hydrogen absorption under a hydrogen pressure of 0.067-0.098 MPa and dehydrogenated at 550 ℃.

154. The method for preparing an R-T-B based permanent magnet material according to claim 151, wherein the particle size of the powder after the jet milling treatment is 3.8 to 4.2 μm.

155. The method for preparing a R-T-B series permanent magnet material according to claim 154, wherein the particle size of the powder after the jet milling treatment is 3.9 μm.

156. The method of claim 148, wherein the sintering temperature is greater than 1000 ℃.

157. The method for preparing an R-T-B series permanent magnet material according to claim 156, wherein the sintering temperature is 1050-1200 ℃.

158. The method for preparing a R-T-B series permanent magnet material according to claim 157, wherein the sintering temperature is 1070 ℃.

159. The method for preparing an R-T-B series permanent magnet material according to claim 148, wherein the sintering time is 4-7 hours.

160. The method of claim 159, wherein the sintering time is 6 hours.

161. The method of claim 148, wherein the sintering further comprises a back firing step.

162. The method for preparing an R-T-B series permanent magnet material according to claim 161, wherein the temperature of the back firing is 1050-1100 ℃.

163. The method of preparing a R-T-B series permanent magnet material according to claim 162, wherein the temperature of the back firing is 1080 ℃.

164. The method for preparing an R-T-B series permanent magnet material according to claim 161, wherein the time for back firing is 3-5 hours.

165. The method for preparing an R-T-B series permanent magnet material according to claim 164, wherein the time for back firing is 4 hours.

166. The method for preparing an R-T-B series permanent magnet material according to claim 148, wherein the aging treatment comprises a primary aging treatment and a secondary aging treatment.

167. The method for preparing an R-T-B series permanent magnet material according to claim 166, wherein the primary aging treatment is performed under argon atmosphere; the purity of argon in the argon atmosphere is more than 99.9%.

168. The method for preparing an R-T-B series permanent magnet material according to claim 166, wherein the temperature of the primary aging treatment is 800-950 ℃.

169. The method of claim 168, wherein the primary aging is performed at a temperature of 900 ℃.

170. The method for preparing an R-T-B series permanent magnet material according to claim 166, wherein the primary aging treatment is performed for 2-4 hours.

171. The method of claim 170, wherein the primary aging is performed for 3 hours.

172. The method for preparing an R-T-B series permanent magnet material according to claim 166, wherein the temperature of the secondary aging treatment is 430-490 ℃.

173. The method for preparing an R-T-B permanent magnet material according to claim 166, wherein the secondary aging is performed for 2-4 hours.

174. The method of claim 173, wherein the secondary aging is performed for 3 hours.

175. The method of claim 166, wherein the rate of heating to the primary aging temperature or the secondary aging temperature is 3-5 ℃/min.

176. The method of claim 148, wherein the master alloy is prepared by preparing each element in the master alloy into a master alloy solution; and then the main alloy solution passes through a rotating copper roller, and is subjected to refining and casting in sequence, and is cooled to obtain the main alloy cast sheet.

177. The method for preparing an R-T-B series permanent magnet material according to claim 176, wherein the rotational speed of the copper roller is 40±0.2rpm.

178. The method for preparing an R-T-B series permanent magnet material according to claim 176, wherein the temperature of the refining is 1520 ± 20 ℃.

179. The method for preparing an R-T-B series permanent magnet material according to claim 176, wherein the casting temperature is 1420 ± 10 ℃.

180. The method for preparing an R-T-B series permanent magnet material according to claim 176, wherein the cooling is to below 50 ℃.

181. The method of claim 148, wherein the preparing the secondary alloy comprises preparing each element of the secondary alloy into a secondary alloy solution; and then the auxiliary alloy solution passes through a copper roller which rotates, is refined and cast in sequence, and is cooled to prepare the auxiliary alloy casting sheet.

182. The method for preparing an R-T-B series permanent magnet material according to claim 181, wherein the rotation speed of the copper roller is 40±0.2rpm.

183. The method for preparing an R-T-B series permanent magnet material according to claim 181, wherein the temperature of the refining is 1400-1570 ℃.

184. The method for preparing an R-T-B system permanent magnet material according to claim 181, wherein the casting temperature is 1420-1470 ℃.

185. The method for preparing an R-T-B series permanent magnet material according to claim 181, wherein the cooling is to below 50 ℃.

186. An R-T-B permanent magnet material, characterized in that it is prepared by the preparation method of an R-T-B permanent magnet material according to any one of claims 75 to 185.

187. Use of an R-T-B series permanent magnet material according to any one of claims 1 to 74 and 186 as an electronic component.