JPS58147007A - Preparation of permanent magnet - Google Patents

Abstract

PURPOSE:To obtain uniform magnetic powder for a matrix magnet of, particularly, Cu substituted R2Co17 series by a method wherein fused metal containing certain percentages of a rear earth element R and transition metals (Co, Fe) is rapidly cooled to reduce the metal to powder, which is then subjected to ageing. CONSTITUTION:Use is made of M which contains one or more than one kind of R, Si, Ti, Zr, Hf, Nb, Ta, V which contains one or more than one kind of rare earth element, or mainly Sm, Cs. Then an alloy R (Co1-x-y-zFexCuyMz)A having a composition within the range of 0.01<=x<=0.4, 0.02<=y<=0.25, 0.001<=z<=0.15, 5.5<=A<=8.5 is fused and jetted out of a nozzle onto a thermal-conductive roll rotating at high speed in the atmosphere of N2 and then rapidly cooled at 10<3> deg.C/ sec or over so that the powder obtained in a heat-fused state may have the normal temperature. The magnetic powder is subjected to ageing in predetermined conditions and particle size adjustment, mixed with a binder, arranged in the magnetic field, and formed into a matrix magnet. This method enables the mass production of uniform magnetic powder for a permanent magnet of Cu substituted R2Co17 series effective as a matrix magnet.

Description

[Detailed Description of the Invention] The present invention provides rare earth elements R and transition metals (Co, Fg).
The present invention relates to an intermetallic compound matrix permanent magnet, and a Ctb substitution disk R2Co 1y matrix permanent magnet with a low rare earth component. The matrix magnet is RCo5 (
'/, ) system, R2Co 17 ('47) system, and m-crystalline magnets have a lower density and lower magnetic properties.

However, after molding in a magnetic field, the molded body can be made into a product as it is without the need for sintering, processing, etc., which is a problem. Furthermore, during molding, it is possible to manufacture complex shapes at low cost by using martial arts such as elbow molding, compression molding, and extrusion molding, and a wide range of applications can be expected, unlike sintered magnets. The special KCb substitution temperature R2Co 17 matrix magnet has high characteristics among rare earth cobalt matrix magnets, and because it has a low composition of rare earth components, it also has stability against oxidation, which has traditionally been a drawback of rare earth cobalt matrix magnets. Relatively good ◎Also C° word replacement @
The coercive force mechanism of R2Co1y permanent magnets is ``Fanning'' of the domain wall due to fine precipitates.
The particle size dependence of lIc magnetic powder is extremely small. Such cost quality is very advantageous as a matrix magnet.

However, in the conventional method for producing magnetic powder for C-substituted llR2C01y matrix magnets, an ingot was first prepared by melting, and then the ingot was held at a high temperature (1100 to 1200 K) for several hours in order to homogenize and solutionize it. The O quenched ingot, which has been post-quenched (in ail or A degas airflow), is then subjected to aging treatment for the purpose of obtaining coercive force, and after pulverization, the degree of restriction is adjusted to form matrix magnetic powder. As mentioned above, the ingot needs to be solutionized and then rapidly cooled, so in order to obtain homogeneous magnetic powder, the size of the ingot is
There is a limit to the amount of ingots, and there is a drawback that homogeneous magnetic powder-bz cannot be obtained when processing a large amount of ingots. The present invention is based on Cμ
This method was developed to solve the above-mentioned drawbacks of substituted mR2Co17-based matrix magnets.The production of homogeneous magnets made by obtaining powder by ultra-rapidly cooling a molten alloy and then subjecting it to an aging treatment. The purpose is to provide a method for dissolving each element.

By jetting the alloyed molten metal from a nozzle onto the roll surface rotating at high speed to obtain a homogeneous super-quenched powder, this powder is super-quenched to bring the solution state at high temperature to room temperature. K used as magnetic powder for lux stones
This means that it is sufficient to add an aging treatment to this powder. In addition, when performing ultra-rapid cooling, it is necessary to perform it in a vacuum or an inert gas atmosphere to prevent the molten alloy 1 and powder from oxidizing, and the roll material has good thermal conductivity (:u
, Fg and their alloys are suitable. Also, the speed of super-quenching varies depending on conditions such as the jetting temperature and pressure of the molten alloy, and the rotation speed of the roll, and the faster the speed, the better.
Effective at 5υ/sec or more. Other amorphous metal powder production methods such as gas atomization method, centrifuge, -gal atomization method, twin roll method, melt spinning method, etc. can also be applied, and nonmetallic elements B, P, and C, which are effective for rapid cooling, can also be applied. , Si, etc. may be added.

This powder is subjected to the following aging treatment to adjust the particle size.
The matrix magnet of the present invention is manufactured by assimilation processes such as mixing with -, molding in a magnetic field, injection molding in a magnetic field, and extrusion molding in a magnetic field. The aging treatment varies depending on the alloy composition. Generally, multi-stage aging, continuous aging, etc. are used, but depending on the composition, even one-stage aging is sufficient. R as S
When using w+, the starting temperature for multi-stage aging and continuous aging is 80
0 to 900υ are selected and replaced with C-, which is part of the S section (
and the aging start temperature decreases. Aging up to 400 υ is sufficient, and multi-stage aging or continuous cooling up to 400 υ is usually used. Regarding particle size adjustment, in the case of this alloy system, it is possible to use powder with a wide range of particle sizes. It can also be used in its original particle size. However, in order to increase the injection rate, it is common to use a mixture of powders with different particle sizes, so pulverization is carried out using a disk mill, ball mill, vibrating mill, etc. There are two ways to create a molded body: a method in which particle size-adjusted powder is molded in a magnetic field and then impregnated with a binder, and a method in which the binder and powder are mixed in advance and solidified with the binder after molding in an AI magnetic field.

The alloy used in the present invention is R(Co)φy-z", g
cu, M2) A. Here, R is Ill or a combination of two or more rare earth metals centered on S shoulder, C, and 1M is Si, Ti, Zr, Hf,! 1k:
One of Ta and V.

is a combination of two or more types. Also, Q, 01≦X≦r:
L40α02≦y≦0.25, 0.001≦2≦α1
5, 45≦A≦8.5. F-substitution amount S is 0
．． If it is less than 0.01, no increase in saturation magnetization can be expected;
If the value is 40 or more, the saturation magnetization increases;
IEC decreases significantly. Cm substitution amount y is 0.02°
In the following cases, sufficient precipitation hardening does not proceed and tflc cannot be obtained. When Q is 25 or more, the saturation magnetization decreases. When the additive element amount 2 is less than α001, no improvement in rflc is observed, and when it is more than 115, the saturation magnetization decreases significantly. The reason for limiting the value of A from a5 to 8.5 is that if it is less than 55, the saturation magnetization becomes too small and sufficient characteristics cannot be obtained. Further, when the value is 8.5 or more, dendrites are likely to appear in the melted ingot, and this foreign phase causes a decrease in zilc.

Epoxy resins can be used as the binder in the present invention, and epoxy resins using diamides with poor thermal stability and phenyl resin as hardening agents are particularly suitable. Furthermore, ethylene vinyl acetate copolymers, modified pokuolefin resins, low melting point pokuamide resins, etc. can also be used.

The present invention' will be explained below with reference to Examples.

<Example 1>S"("' (L688 "(12C"tzlEf
(LO12) 7.0 An alloy fk was melted in a crucible by high-frequency heating in an Ar atmosphere, and the molten liquid was jetted out from a lower nozzle at 1450 °C to produce a rapidly solidified powder using a twin-roll atomization method. Roll rotation speed is 6000 rolls for twin rolls, plm, and 5000 rJ for quenching rolls.
It was set as ul. The rapidly cooled powder obtained here was then subjected to aging treatment. The pattern used was 1 after holding at 800℃ x 21r.
Slowly cool down to 400 t at a rate of 3υ/vain,
0tX8Ar' is held.

The particle size of the aged powder was adjusted to 150 μm or less using a disk mill, mixed with ethylene acetate vinyl alcohol copolymer, and compression molded in a vertical magnetic field. The temperature of the mold is 100v. The molding pressure 10# is 10t0-, and the orientation magnetic field is 8. Table IK shows the magnetic properties of the molded article obtained. Further comparison.

The magnetic properties of matrix magnets with the same composition prepared using the conventional method are shown below. (The conditions of powder particle size, used resin, molding pressure, and orientation magnetic field strength were the same.) Table 1 After holding these magnets at 100 υ x 2000'', the rate of decrease in magnetic flux (excellent 1 ots) was investigated.The sample shape was 101'
X7'(7'=-2).

In the method of the present invention, 5. ' % sThe conventional method was 9.5 excellent.

It can be seen that the % tazz is improved because the magnetic powder produced by the method of the present invention is homogeneous @ <Example 2> Six types of rapidly solidified alloy powders shown in Table 2 were produced by the same method as in Example 1, and then 750v＾850t Xl 0
After maintaining the hrl, it was gradually cooled down to 400 υ at 1 υ/ntin. Adjusting the particle size of the powder subjected to these treatments ■125
Two sizes were prepared: ~250μ and ■〈44μ. size@
75%, size ■25 ring and silane coupling material I
Wt@ was mixed and subjected to transverse magnetic field molding in a 20XD- magnetic field. Heat-resistant resin lSOX resin (Hitachi product name) for the molded body
was impregnated in vacuo. Table 2 shows the alloys used and the magnetic properties obtained.

Table 2 Procedural amendment (voluntary) 1□, 15126.1, 14.1 Indication of the case of the Commissioner of the Patent Office 1982 Patent Application No. 19667 Name of the invention Name of the person making the amendment #, I-luck] Hitachi Metals Co., Ltd. Representative Norio Hatakekono Address Address: 2-1-2 E, Marunouchi, Chiyoda-ku, Tokyo
l: 11m inside the company tKkyo mm54-
4a4 Supplement jE Targeted Amendment Contents 1 #1 The description of flattery in the “Detailed Description of the Invention” in Book 1ill is corrected as follows. ” is corrected.

(2) Correct "coercive blade side 1" in line jjJllllQ of the same book to "coercive force mechanism".

Soot (s) Correct "light ejection rate" in line 115jill 13 of the same book to "charge rate" 〇 (4) Correct rOnJ in line 9 of 1s 6 of the same book to "Ou" 0 (6) Circular Dosei No. Change “precipitation hardening” in line 10 to “precipitation hardening”
Correct.

that's all

Claims (1)

[Claims] ... R(Co1-x-y-zFgscbyMz), (
Here R is 5FII. Rare earth metals centered on C-. One type or a combination of two or more types, M is Si m Ti, Zr, U
, Nb. One type or combination of two or more types of Ta-V, 0.01≦X
≦α40. α02≦y≦0.25, Q, ool≦2
A method for producing a permanent magnet, characterized in that powder is produced by ultra-quenching a molten alloy having a composition of ≦(115°5.5≦A≦8.5), and then subjected to aging treatment. (21% In the manufacturing method described in claim 1,
A method for producing a permanent magnet, characterized in that the above powder is mixed with a binder, oriented and compression molded in a magnetic field.゛r51 41. The method of manufacturing a permanent magnet according to claim 1, wherein the powder is oriented in a magnetic field and compression molded, and then impregnated with a binder.