JPH01276705A - Rare earth resin permanent magnet and manufacture thereof - Google Patents

Abstract

PURPOSE:To enable mass-production by arranging and combining a magnetic thin piece in a surface direction which is acquired by quenching a specified alloy. CONSTITUTION:An alloy shown in an equation I is enclosed in a quartz tube and sprayed from an orifice by heated and dissolved at 1450 deg.C in an Ar atmosphere, and quenched at a set quenching velocity of 10<4>-10<6> deg.C/(sec). A ribbon 1 thus obtained is cut in a longitudinal direction to acquire a magnetic thin piece 2. The magnetic thin piece 2 is arranged and combined in a surface direction to form a permanent magnet. In the equation I, R is rare earth, T is Fe and Co base transition metal, M is B, C, Si and Al base metalloid element, and 0.02<=y<=0.15 and 5<=z<=9. Mass-production of the permanent magnet can be thereby realized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rare earth transition metal anisotropic resin bonded permanent magnet and a method for manufacturing the same.

[Prior Art] Ever since it was discovered that an intermetallic compound with a rare earth metal to transition metal ratio of 2:17 in a rare earth transition metal alloy has theoretically extremely high magnetic properties [(BH)wax ~ 50HGOe]. Various attempts have been made to obtain permanent magnets based on similar compounds. And 5s-Co-
For Cu-Fe-based intermetallic compounds, (Bll)max ~3
High magnetic properties of 0HGOe have been obtained, and more recently Nd
2 Fe1JB intermetallic other metal T: (BH)max~
High magnetic properties of 40HGOe can now be obtained. N
For dFeB permanent magnets, thin ribbons are conventionally obtained by the rapid solidification method and crushed to particles with a particle size of about 200 mm to be used as a material for permanent magnets or resin-bonded permanent magnets.
It is densified by hot pressing at a temperature of about 0°C, and a magnetically anisotropic material is obtained by hot plastic deformation processing, which is crushed to a particle size of about 200 particles, oriented in a magnetic field, and solidified with resin, etc. It has also been proposed that an anisotropic permanent magnet can be obtained by this method.

[Problems to be Solved by the Invention] However, in the conventional permanent magnet and its manufacturing method using the rapid solidification method, only an isotropic permanent magnet can be obtained by crushing and solidifying a rapidly solidified ribbon, and ar7! In order to obtain an anisotropic permanent magnet with i-characteristics, it is necessary to go through a process of hot-pressing a thin ribbon, plastically deforming it, and then crushing and solidifying it, which is expensive in terms of cost and requires production in large quantities. The drawback was that it couldn't be done.

In view of this point, it is an object of the present invention to provide an anisotropic permanent magnet by a rapid solidification method that simplifies the manufacturing process and can be mass-produced, and a method for manufacturing the same.

[Means for Solving the Problems] The present invention is represented by the general formula R(T1.M,) 2, and R
is a rare earth, T is a transition metal mainly composed of Fe and Co 1M
is a metalloid element mainly composed of B, C, si, and AJ, and 0.02≦y≦0.15. This is a magnetically anisotropic rare earth resin permanent magnet characterized by magnetic flakes obtained by quenching an alloy composed of 5≦7≦9 arranged and bonded in the plane direction, and the quenching rate of the alloy is 10'. ~106℃
/sec, this magnetic thin piece should be set at 0.2m x
It is preferable to make it 0.03 m x 1 m or more,
A preferential magnetization direction can be set by magnetizing the magnetic thin piece in the length direction or width direction. If the quenching rate of the alloy is less than 104°C/sec, it will be difficult to crush the alloy.
If the temperature exceeds 106° C./sec, the alloy becomes amorphous and no coercive force is generated. For example, the quenched body is 0.5” 3 m wide and 2 to 100 In!a long by the single roll quenching method.

A ribbon with a thickness of about 0.05 m is obtained, which is crushed,
Due to cutting etc. 0.2mw x 0.03aa+ x 1
Unless a magnetic thin piece of cm or more is obtained, magnetic anisotropy cannot be obtained, so there are limitations. Quenching ribbon is 500-9
Coercive force can be further increased by heat treatment at 00°C.

[Example 1] Nd [(18□, 7°00.3)0.94B0.0
30g of B16.3 alloy was sealed in a quartz tube, heated and melted at 1450°C in an Ar atmosphere, ejected for 4 seconds from an orifice with a diameter of 0.7M, and rapidly solidified on a single roll at a circumferential speed of 15m/s. . Obtained width lrn! R, wall thickness 0.03m
+ As shown in Fig. 1, magnetic thin pieces 2 are obtained by cutting the glue ribbon into pieces of about 10 aI in the direction of the ribbon, which are then arranged in the length direction and solidified with epoxy resin to form a permanent magnet. When the magnetic properties of the body were measured using a vibrating magnetometer, the residual magnetization (Br), coercive force (iHc), and maximum energy product (
[Bll]max) was as shown in Table 1, and it was a resin-bonded permanent magnet having magnetic anisotropy in the length direction.

[Example 2] 30 g of (FeO, 94B0.06)6.5 alloy was sealed in a quartz tube, heated and melted at 1450°C in an Ar atmosphere, and ejected from an orifice with a diameter of 0.7 in 4 seconds. , was rapidly solidified on a single roll with a circumferential speed of 20 m/s.
Heat treated in vacuum at 0°C for 2 hours, and the obtained ribbon was cut into lengths of approximately 10 #I11 in the same manner as in Example 1, arranged in the length direction, and solidified with epoxy resin to form permanent The magnetic properties of the magnet body were measured, and it was found to be a resin-bonded permanent magnet with magnetic anisotropy in the length direction.

[Effects of the Invention] According to the present invention, the quenched ribbon obtained at the above-mentioned quenching rate does not become amorphous and has magnetic anisotropy, so that the resin can be made permanent by simply crushing, cutting and arranging the anisotropic ribbon. Since a magnet can be formed, the manufacturing process can be simplified, and the crushed and cut magnetic flakes have extremely coarse grain sizes, making them permanent magnets that are less susceptible to oxidation and corrosion.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of obtaining a magnetic thin piece according to the present invention. 1: Ribbon 2: Magnetic thin piece Patent applicant Namiki Precision Jewel Co., Ltd. Figure 1

Claims (5)

[Claims] (1) It is represented by the general formula R( T_1_-_yM_y)_z, where R is a rare earth, T is a transition metal mainly composed of Fe and Co, and M is a metalloid element mainly composed of B, C, Si, and Al. A magnetically anisotropic rare earth resin permanent magnet characterized in that magnetic flakes obtained by rapidly cooling an alloy composed of 0.02≦y≦0.15, 5≦z≦9 are arranged and bonded in the plane direction. . (2) The quenching rate of the alloy is 10^4 to 10^6℃/sec.
A method for manufacturing a magnetically anisotropic rare earth resin permanent magnet according to claim (1). (3) Claim in which the rapidly cooled body is heat treated at 500 to 900°C
1) The method for producing the magnetically anisotropic rare earth resin permanent magnet. (4) The magnetically anisotropic rare earth resin permanent magnet according to claim (1), wherein the magnetic thin piece has a size of 0.2 mm x 0.03 mm x 1 mm or more. (5) A magnetically anisotropic rare earth resin permanent magnet in which a preferential magnetization direction is set by magnetizing the magnetic thin piece in the length direction or width direction.