JPH02153036A - Wear-resistant high permeability alloy for magnetic recording/reproducing head, manufacturing method thereof, and magnetic recording/reproducing head - Google Patents

Abstract

PURPOSE:To manufacture the title magnetic alloy useful for a magnetic recording/reproducing head or the like by subjecting an alloy essentially consisting of specific ratios of Ni, Zn, Cd and iron and consisting of specific amounts of copper, W, etc., as auxiliary components to heating and cooling under specific conditions. CONSTITUTION:An alloy consisting essentially of an alloy constituted of, by weight, 30 to 90% Ni, total 0.001 to 5% of one or both of Zn and Cd and the balance iron with small amounts of impurities and contg., as auxiliary components, total 0.01 to 30% of one or more kinds among <=30% copper, each <=20% of W and Ta, each <=15% Nb, Mn and Cr, each <=10% of Mo, V, gold and Co, each <=5% of Ti, Si, Ge, Ga, In, Tl, Sr, Ba and platinum group elements, each <=3% of Al, Zr, Hf, silver, rare earth elements, Be, tin and Sb and each <=2% of B and P is suitably heated at a temp. of >=600 deg.C and below the m.p. for 1min to 100hr in a non-oxidizing atmosphere or in vacuum and is thereafter cooled to a normal temp. from >=600 deg.C at a suitable cooling speed of 100 deg.C/sec to 1 deg.C/hr.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for manufacturing a high permeability alloy that has excellent magnetic properties and wear resistance in an alternating magnetic field, is easy to forge, and is suitable for magnetic recording/reproducing heads, and This relates to a recording/reproducing head.

(Prior Art) Since magnetic recording/reproducing heads such as tape recorders operate in alternating magnetic fields, the magnetic alloys used therein are required to have high effective magnetic permeability in high-frequency magnetic fields. It is desired that the wear resistance is good because it slides on the surface. Currently, Sendust (
Fe-Si-Af alloy) and ferrite (MnO-
ZnOFe203).

(Problems to be Solved by the Invention) However, these alloys are extremely hard and brittle, making it impossible to forge or roll them.
Polishing methods are used and the products are therefore expensive. Sendust has a high saturation magnetic flux density, but since it cannot be made into a thin plate, its effective magnetic permeability in a high frequency magnetic field is relatively low. Further, although ferrite has a high effective magnetic permeability, its drawback is that its saturation magnetic flux density is low at 500 c or less. On the other hand, permalloy (Ni--Fe alloy) is easy to forge, roll, and punch and has excellent mass productivity, but its major drawback is that it is soft and easily abraded.

The present inventors have conducted numerous studies on improving the magnetic properties and wear resistance of Ni-Fe alloys, and have found that Nt-Fe alloys contain a total of one or two of the NB group elements zinc and cadmium. The objective was achieved by adding 0.001 to 5%.

(Means for solving problems) The features of the present invention are as follows.

First Invention The main component is an alloy consisting of 30 to 90% nickel, a total of 0.001 to 5% of one or both of zinc and cadmium, a small amount of impurities, and the balance iron, and the subcomponent is 30% copper. % or less, 20 each for tungsten and tantalum
% or less, 15% or less each of niobium, manganese, and chromium, molybdenum, and vanadium.

Less than 10% each of gold and cobalt, titanium, silicon,
Less than 5% each of germanium, gallium, indium, thallium, strontium, barium, platinum group elements, aluminum, zirconium.

Hafnium, St rare earth elements, beryllium, tin.

3% or less each of antimony, 2% or less each of boron, phosphorus, one or more types, total 0.01 to 30
% in a non-oxidizing atmosphere or in vacuum at a temperature of 600°C or higher and lower than the melting point for at least 1 minute or more and 100 hours or less, and then heated from a temperature of 600°C or higher to a temperature of 600°C or higher A method for producing a wear-resistant high permeability alloy for a magnetic recording/reproducing head, which comprises cooling to room temperature at an appropriate rate corresponding to the composition of 100° C./sec to 1° C./hour.

Second Invention The main component is an alloy consisting of 30 to 90% nickel, a total of 0.001 to 5% of one or both of zinc and cadmium, a small amount of impurities and the balance iron, and 30% copper as a subcomponent. % or less, 20 each for tungsten and tantalum
% or less, 15% or less each of niobium, manganese, and chromium, molybdenum, and vanadium.

Less than 10% each of gold and cobalt, titanium, silicon,
Less than 5% each of germanium, gallium, indium, thallium, strontium, barium, platinum group elements, aluminum, zirconium.

Hafnium, vA, rare earth elements, beryllium, tin.

3% or less each of antimony, 2% or less each of boron, phosphorus, one or more types, total 0.01 to 30
% in a non-oxidizing atmosphere or in vacuum at a temperature of 600 °C or higher and lower than the melting point.
After heating for an appropriate time corresponding to the composition for more than a minute and less than 100 hours, from a temperature of 600"C or more to 100℃/second to 1
Cool to room temperature at an appropriate rate corresponding to the composition in °C/hour,
This is further heated in a non-oxidizing atmosphere or in vacuum at a temperature of 600°C or less for an appropriate time corresponding to the composition for 1 minute or more and 100 hours or less, and then cooled. Method of manufacturing magnetic alloys.

Third Invention The main ingredients are an alloy consisting of 30-90% nickel, a total of 0.001-5% of one or both of zinc and cadmium, a small amount of impurities and the balance iron, and 430% w as a sub-component. Below 1, 20% or less each of tungsten and tantalum, 15% each of niobium, manganese, and chromium
% or less, molybdenum, vanadium.

Less than 10% each of gold and cobalt, titanium, silicon,
Germanium, gallium, indium, thallium, strontium, barium 3 5% or less each of platinum group elements, aluminum, zirconium.

Hafnium, silver, rare earth elements, beryllium, tin.

3% or less each of antimony, 2% or less each of boron, phosphorus, one or more types, total 0.01 to 30
A magnetic recording/reproducing head using an alloy containing %.

(Function) The alloy of the present invention has a saturation magnetic flux density of 50,000 or more, has excellent wear resistance and effective magnetic permeability, and provides a high permeability magnetic alloy that can be used for magnetic recording/reproducing heads and the like.

Furthermore, the present invention relates to a magnetic recording/reproducing head with excellent wear resistance manufactured using the above-mentioned high magnetic permeability alloy for the case, core, etc.

To make the alloy of the present invention, first the main component nickel 30~
90%, a total of 0.001 to 5% of one or both of zinc and cadmium, and an appropriate amount of the balance iron in a non-oxidizing atmosphere or in a vacuum using an appropriate melting furnace, and then A small amount of an acid agent and a desulfurizing agent are added to remove impurities as much as possible, and in addition, 30% or less of copper, 20% or less of each of tungsten and tankur, 15% or less of each of niobium, manganese, and chromium, molybdenum, and vanadium.

Less than 10% each of gold and cobalt, titanium, silicon,
Less than 5% each of germanium, gallium, indium, thallium, strontium, barium diplatinum group elements, aluminum, zirconium.

Add one or more of hafnium, rare earth elements, helium, tin, antimony at 3% or less each, boron, phosphorus at 2% or less each in a total amount of 0.01 to 30%, and stir thoroughly; Create a compositionally uniform molten alloy. Next, this is poured into a mold of an appropriate shape and size to obtain a sound ingot, which is then subjected to forging, hot rolling, and cold rolling at high temperatures to form the desired shape.
For example, a thin plate with a thickness of 0.1a+w is made.

Next, a piece of the desired shape and size is punched out from the thin plate and heated in a suitable non-oxidizing atmosphere (hydrogen, argon gas, nitrogen, etc.) or in vacuum at a temperature higher than the recrystallization temperature, that is, approximately 600 °C or higher, especially 800 °C. 1 at temperatures above ℃ and below the melting point
Heating is performed for at least 1 minute and then cooled at an appropriate rate depending on the composition, e.g. 100"C/sec to 1°C/hour. temperature below the transformation point), especially 200 to 60
By heating to 0° C. for 1 minute to 100 hours and cooling, a high permeability magnetic alloy having a saturation magnetic flux density of 50,000 or more and excellent wear resistance can be obtained.

From the above solution temperature to the regular-disordered lattice transformation point (approximately 60
When cooling to a temperature of 0° C. or higher, there is no significant difference in the magnetism obtained whether the material is rapidly cooled or slowly cooled, but the cooling rate below this transformation point has a large effect on the magnetism. That is, by cooling from a temperature above this transformation point to room temperature at an appropriate rate corresponding to the composition of 100° C./sec to BiC/hour, the degree of regularity of the ground can be appropriately adjusted and excellent magnetism can be obtained. If the material is rapidly cooled at a rate close to 100° C./sec among the above cooling rates, the degree of order decreases, and if it is cooled faster than this, the degree of order does not proceed, and the degree of order decreases further and the magnetism deteriorates. However, when an alloy with a low degree of order is reheated to 200 to 600 ''C, below its transformation point, and cooled, ordering progresses and the degree of order becomes moderate, improving magnetism.On the other hand,
If it is slowly cooled from a temperature above the above-mentioned transformation point at a speed of, for example, 1'c/hour or less, ordering will proceed too much and the magnetism will decrease.

(Example) Next, examples of the present invention will be described.

] Soil alloy number 66 (composition Ni-79.0%, Zn-0.7%
.

To make a sample (Cd-1.2%, Nb-7.0%, balance Fe), put the total weight of 800 g of the alloy material with the above composition into an alumina crucible, melt it in a high-frequency induction electric furnace in vacuum, and then stir well. It was made into a molten alloy.

Next, this was made into a diameter of 25mmn1. The ingot was poured into a mold with a hole of 170 mm in height, and the resulting ingot was forged at about 1100°C to form a plate with a thickness of about 7 ms+. About 600 to 90 more
Hot rolled at 0°C to a thickness of 1mm, then cold rolled at room temperature to form a thin plate of 0.1mm, and then rolled to a thickness of 4mm.
An annular plate with a diameter of 5 mm and an inner diameter of 33 mm and a magnetic head core were punched out. Next, these were subjected to various heat treatments shown in Table 1, the annular plate was used to test the magnetic properties, the core was used to manufacture a magnetic head, and a surface roughness meter was used to test the magnetic tape (CrO□).
The amount of wear after 200 hours was measured and the results shown in Table 1 were obtained.

Next, Table 2 shows that after heating in a vacuum at 1150°C for 2 hours, cooling from 600°C to room temperature at various rates, or further heating at a temperature below 600°C,
The properties of typical alloys measured at room temperature are shown.

Next, the effect of adding zinc and cadmium to the alloy of the present invention will be described in detail with reference to the drawings. Figure 1 shows 78.5
%Ni-Fe-Zn alloy, the relationship between Zn addition amount, effective magnetic permeability, saturation magnetic flux density, and wear amount is shown in Figure 2.
Figure 3 shows the relationship between Ni loading, effective magnetic permeability, saturation magnetic flux density, and wear amount.
The relationship between the amount of Cd added and the effective magnetic permeability, saturation magnetic flux density, and amount of wear for the alloy is shown in Figure 4.
The relationship between the amount of Cd added, effective magnetic permeability, saturation magnetic flux density, and amount of wear is shown for Fe-7%Nb-Cd alloy.

Figure 5 shows 79.0%NiFe 1.0%Zn-
Addition amount and effective magnetic permeability of each element when Cu, W, Ta, N'b or Mn is added to 1.0% Cd alloy,
The relationship between saturation magnetic flux density and amount of wear is shown.

Figure 6 shows 79.0%r'Ji-Fe-1.0%Zn-1
,0%Cd alloy with Cr, Mo, V, Au or C
.

The relationship between the amount of each element added and the effective magnetic permeability, saturation magnetic flux density, and amount of wear is shown below.

Figure 7 shows 79.0%Ni-Fe-1,0%Zn-1,0
%Cd alloy with Ti, St, Ge, Ga, In.

The relationship between the amount of each element added, effective magnetic permeability, saturation magnetic flux density, and amount of wear when Tffi, Sr, Ba, Pt, or Af is added is shown.

Figure 8 shows 79.0%N'i-F's 1.0%Zn-
1.0% Cd alloy with Zr, Hf, Ag, Ce, Be.

The relationship between the amount of each element added, effective magnetic permeability, saturation magnetic flux density, and amount of wear when Sn, Sb, B, or P is added is shown.

Generally, as the amount of zinc or cadmium added increases, the effective magnetic permeability increases significantly and the amount of wear decreases. However, if the zinc and cadmium content exceeds 5%, processing becomes difficult, which is not preferable.

The improvement in magnetic properties of the present invention is due to the deoxidation and desulfurization effects of zinc and cadmium during melting, which remove impurities and purify the alloy structure. It is thought that the magnetic energy becomes small (and becomes easily magnetized).

Furthermore, since Ni-Zn, Fe-Zn, Ni-Cd, and Fe-Cd intermetallic compounds precipitate finely, dividing the magnetic domain and increasing the domain wall, the relative movement speed of the domain wall in an alternating magnetic field is It is believed that this reduces the eddy current loss and provides a large effective magnetic permeability. The improvement in wear resistance of the alloy of the present invention is due to the fact that when zinc or cadmium is added, the base of the Ni-Fe alloy is solid solution hardened, and strong intermetallic compounds are finely precipitated on the base.
This is thought to be due to further improvement in corrosion resistance.

Furthermore, Cu, W, and Nb are added as subcomponents.

Ta, Mn, Mo, V, Au, Co, Cr, Ti.

Ge, Ga, In, Ti, Sr, Ba, Af.

Si, Zr, Hf, Ag, rare earth elements, platinum group elements, B
E, Sn, Sb, B, P, etc. have the effect of increasing the effective magnetic permeability of the alloy of the present invention, as shown in FIGS. 5 to 8, and CO is particularly effective in increasing the saturation magnetic flux density. Furthermore, Cu, W.

Nb, Ta, V, Au, Ti, Ge, Ga, I
n.

Tl, Sr, Ba, A/! , Si,
Zr, Hf.

Ag, rare earth elements, platinum group elements, Be, Sn.

As shown in FIGS. 5 to 8, Sb, B, and P have a large effect on improving the wear resistance of the alloy of the present invention, and Sr, Ba, Nb, Ta, and Mn.

Ti, Si, and rare earth elements have a great effect on improving forging workability.

Next, in the present invention, the structure of the alloy is 30 to 90% nickel.
, a total of one or two of zinc or cadmium 0.00
1 to 5% and the balance is limited to iron, and the elements added to this are w430% or less, tungsten and tantalum each 20% or less, niobium, and manganese.

15% or less of each of chromium, 10% or less of each of molybdenum, vanadium, gold, and cobalt, and titanium.

Silicon, germanium, gallium, indium.

Thallium, strontium, barium, 5% or less of each of platinum group elements, aluminum, zirconium, hafnium, rare earth elements, beryllium.

3% or less each of tin and antimony, and 2% or less each of boron and phosphorus, total of 0.01 or more of one or more types
The reason why it is limited to 30% is that, as is clear from Examples, Table 2, and Figures 5 to 8, the saturation magnetic flux density in that composition range is 50,000 or more, and it has excellent effective magnetic permeability and wear resistance. It also has good workability, but if the composition is outside this range, the saturation magnetic flux density will be less than 5000 G, the effective magnetic permeability will decrease, wear will increase, and processing will be difficult, making it difficult to use as a material for magnetic recording/reproducing heads. This is because it would be inappropriate. That is, zinc and cadmium are 0
．． If it is less than 0.001%, the effect of addition is small, and if it exceeds 5%, forging becomes difficult. And copper 3 is added to this as a subcomponent.
0% or less, tungsten 20%, niobium 15%, tantalum 20%, manganese 15%, chromium 15%, molybdenum 10%, vanadium 10%, gold 10%, titanium 5%, germanium 5%, gallium 5%, indium 5 %, 5% thallium, 5% strontium, 5% barium, and 5% platinum group elements, the saturation magnetic flux density increases by 5%.
000 c or less, and zirconium 3%,
Forging or This is because processing becomes difficult.
This is because if Co exceeds 10%, the effective magnetic permeability decreases.

Furthermore, as is clear from Table 2, when any of the subcomponents is added to the Ni-Fe alloy, the effective magnetic permeability increases, the hardness also increases, and the wear resistance is improved. The addition of these subcomponents has the same effect and can be considered as the same effective ingredient.Furthermore, rare earth elements consist of scandium, indolium, and lanthanum-based elements, but the effects of adding these subcomponents are completely the same. Yes, and the platinum group elements are platinum, iridium, ruthenium, rhodium, and palladium.

Although it is made of osmium, its effects are exactly the same.

In addition, carbon, nitrogen, oxygen and sulfur improve wear resistance,
Since Te, Se, Bi, Ca, and Ph improve free machinability, they are effective if each is contained in an amount of 0.1% or less without impairing magnetic properties, and there is no problem even if they are contained as impurities in the alloy of the present invention. .

(Effects of the Invention) In short, the alloy of the present invention has a saturation magnetic flux density of 50,000 or more, high effective permeability, excellent wear resistance, and good workability, so it is not only suitable as a magnetic alloy for magnetic recording/reproducing heads, but also It is also very suitable as a magnetic material for use in magnetic recording/reproducing devices for VTRs and electronic computers, as well as ordinary electric appliances.

[Brief explanation of the drawing]

Figure 1 is a characteristic diagram showing the relationship between zinc content, effective magnetic permeability, saturation magnetic flux density, and wear amount for 78.5%Ni-Fe-Zn alloy. A characteristic diagram showing the relationship between zinc content and effective magnetic permeability, saturation magnetic flux density, and wear amount of Zn alloy. Figure 3 shows the relationship between cadmium content and effective magnetic permeability, saturation magnetic flux density, and Figure 4 is a characteristic diagram showing the relationship between the amount of wear and the amount of cadmium in the 79%Nt-Fe-7%Nb-Cd alloy, effective magnetic permeability, saturation magnetic flux density, and amount of wear. The figure shows 79.0%Ni-Fe-1,0%Zn-1,0
A characteristic diagram showing the relationship between the amount of each element added, effective magnetic permeability, saturation magnetic flux density, and wear amount when Cu, W, Ta, Nb, or Mn is added to a %Cd alloy.
．． C in 0%Ni-Fe-10%Zn-1,0%Cd alloy
A characteristic diagram showing the relationship between the amount of each element added, effective magnetic permeability, saturation magnetic flux density, and wear amount when r, Mo, V, Au, or Co is added. Figure 7 shows the relationship between 79.0%Ni-F
e-1,0%Zn-1,0%Cd alloy with Ti, St, and G
a, Ga, In, Tl. A characteristic diagram showing the relationship between the amount of each element added, effective magnetic permeability, saturation magnetic flux density, and amount of wear when Sr, Ba, Pt, or Affi is added. 0%Zn-1,
Zr, Hf, Ag, Ce, Be, Sn in 0% Cd alloy. FIG. 3 is a characteristic diagram showing the relationship between the amount of each element added, effective magnetic permeability, saturation magnetic flux density, and amount of wear when Sb, B, or P is added. xfO' Same as Figure 1

Claims (3)

[Claims] 1. The main component is an alloy consisting of 30-90% nickel by weight, a total of 0.001-5% of one or both of zinc and cadmium, a small amount of impurities and the balance iron, and 30% or less copper as a secondary component. 20% or less each of tungsten and tantalum, 15% each of niobium, manganese, and chromium
% or less, 10% or less each of molybdenum, vanadium, gold, and cobalt, 5% or less each of titanium, silicon, germanium, gallium, indium, thallium, strontium, barium, and platinum group elements, aluminum, zirconium, hafnium, silver, and rare earths. Total of 0.01 of one or more elements: 3% or less each of beryllium, tin, and antimony, and 2% or less each of boron and phosphorus.
After heating an alloy containing ~30% in a non-oxidizing atmosphere or in vacuum at a temperature of 600°C or higher and lower than the melting point for at least 1 minute or more and 100 hours or less for an appropriate time corresponding to the composition, Temperature to 100℃/sec~1
A method for producing a wear-resistant high permeability alloy for a magnetic recording/reproducing head, characterized by cooling to room temperature at an appropriate rate corresponding to the composition in °C/hour. 2. The main component is an alloy consisting of 30-90% nickel by weight, a total of 0.001-5% of one or both of zinc and cadmium, a small amount of impurities and the balance iron, and 30% or less copper as a secondary component. 20% or less each of tungsten and tantalum, 15% each of niobium, manganese, and chromium
% or less, 10% or less each of molybdenum, vanadium, gold, and cobalt, 5% or less each of titanium, silicon, germanium, gallium, indium, thallium, strontium, barium, and platinum group elements, aluminum, zirconium, hafnium, silver, and rare earths. A total of 0.01 of one or more of the elements, beryllium, tin, antimony, each of 3% or less, boron, phosphorous, each of 2% or less
After heating an alloy containing ~30% at a temperature of 600°C or higher and lower than the melting point in a non-oxidizing atmosphere or in vacuum for an appropriate time corresponding to the composition for at least 1 minute and 100 hours, Temperature to 100℃/sec~1
Cool to room temperature at an appropriate rate corresponding to the composition in °C/hour,
This is further heated in a non-oxidizing atmosphere or in vacuum at a temperature of 600°C or less for an appropriate time corresponding to the composition for 1 minute or more and 100 hours or less, and then cooled. Method of manufacturing magnetic alloys. 3. The main component is an alloy consisting of 30-90% nickel by weight, a total of 0.001-5% of one or both of zinc and cadmium, a small amount of impurities and the balance iron, and 30% or less copper as a secondary component. 20% or less each of tungsten and tantalum, 15% each of niobium, manganese, and chromium
% or less, 10% or less each of molybdenum, vanadium, gold, and cobalt, 5% or less each of titanium, silicon, germanium, gallium, indium, thallium, strontium, barium, and platinum group elements, aluminum, zirconium, hafnium, silver, and rare earths. A total of 0.01 of one or more of the elements, beryllium, tin, antimony, each of 3% or less, boron, phosphorous, each of 2% or less
A magnetic recording/reproducing head using an alloy containing ~30%.