JPS58185734A - Production of permanent magnet alloy - Google Patents

Abstract

PURPOSE:To produce a permanent magnet having an excellent magnetic characteristic at a low cost in the stage of producing a permanent magnet alloy consisting of a rare earth element and Co by using an oxide of a rare earth element as a raw material and melting the alloy of Co and a rare earth element. CONSTITUTION:An inexpensive oxide of a rare earth element is used and a reducing agent such as Ca, Mg or the like and CO for an alloy compsn. are used for the same in the stage of producing a premanent magent expressed by the formula RCo5 or R2CO17 (R is >=1 kind rare earth elements including Y). These materials are heated in an inert gaseous atmosphere to reduce the oxide of the rare earth elements and to diffuse the same mutually in Co, thereby forming an alloy. The unreduced oxide of the rare earth elements, the oxide CaO or MgO, of the reducing agents, etc. are interposed in the alloy in this case; therefore, the alloy is once melted to separate the above-mentioned unreduced oxide of the rare earth elements and the oxide of the reducing agent as molten slag, whereby the permanent magnet having an excellent magnetic characteristic is produced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to rare earth gold f1m alloys, particularly permanent magnetic alloys.
This relates to the m method.

Conventionally, most of the RCo5 series (R is one or more of the rare earth metals containing Y) rare earth metal permanent [5] and some of the R2Co1y series rare earth metal permanent [6] were used in the production of 7-ah gold alloys using inexpensive R7C elements. A so-called reduction-diffusion method is used in which oxides are reduced and further diffused. but,
In this RT and diffusion method, there is a problem that a part of the R7c accumulated oxide remains unreduced, or the oxide of the reducing agent used is not removed in the post-processing process and a part of it becomes y1. was there. Due to residual oxides, the RCo5 yarn manufactured by the reduction diffusion method and the JColy rare earth metal Mizukuro 6 have a higher concentration than those manufactured by the dissolution method, especially fiw! The magnetic flux density Br was considerably low.

General [RCo6 Vh fl R2CO17 series Mizuku magnetic a alloy made! In No. 11, a method is adopted in which the constituent elements of Rt are melted in a vacuum melting furnace. Although the magnetic properties obtained by this melting method were quite satisfactory, the metal R7C used as a raw material was expensive, and as a result, the single curvature as permanent 11B6 was expensive. In order to solve this problem, the above-mentioned reduction diffusion method is currently being used, in which the inexpensive R element oxide is reduced with a reducing agent and then diffused into other elements such as VC-Co to form an alloy. It is something that exists. That is, 5rnl o,,Gd,0
．． , a rare earth element oxide such as CI 01 is mixed with a reducing agent such as Ca%Mg and other elements such as Co which is to be used to transform the alloy, and the mixture is heated to an inviscid temperature of 900 to 1.500°C. In some cases, the reaction slows down in the atmosphere. By using the t-alloy manufactured in this way, HaboF
Although the magnetic properties of 9I can be obtained, even if the reaction conditions are optically adjusted, some R7c element oxide remains unreduced. Furthermore, even when the reaction wave is washed, it is inevitable that the oxide of the reducing agent used remains.

Due to the residual presence of such oxides, rare earth metal permanent magnets produced by the reduction diffusion method have a disadvantage in that they have a lower residual magnetic flux density than those produced by the bath S method.

It is an object of the present invention to provide an ia method that improves the drawbacks of the prior art described above and can produce a permanent 4iIib alloy that has a high residual magnetic flux density even when R7C accumulated oxide is used as a raw material.

The X invention uses an oxide of one or more R elements as a reducing agent and C
It is characterized in that a permanent magnetic 6 alloy is produced by mixing other alloys such as 0 and s elements, producing an alloy from the mixture through a reduction/diffusion reaction, and melting the alloy.

In the present invention, the R7C elementary oxide and the oxide of the reducing agent, which have a title in terms of magnetic properties, undergo reduction diffusion invasion, and even if some remain, they are completely removed as slag when scaled. The magnetic properties of Mizuku magnetic alloy by VC #13 are equivalent to the conventional f@ solution method.

Examples according to invention X will be described below. Example t Co powder 246 edges, Sm20B initial 17.4 Kf,
Mix C1 Metal 6 on a scale, put this mixture into a crucible, and put it in an inert gas atmosphere. In the temperature range of 00 to 1.200
An smCoB alloy was produced by reduction of 3 and interdiffusion of the reduced Sm and Co.

This alloy was coarsely pulverized to 50 to 2 QDp, washed and analyzed, and found to have 55.6 g of Sm and 17 g of CoA at a ratio of 1 violet. The remaining CaO was α5%. As a result of X# analysis, the presence of some Sm2O3 was confirmed.

This fine powder was pulverized to 5 to 5 microns in a jet mill, and molded in a magnetic field with an orientation limit of 7,0000e or higher, at hX, with a molding process of 2 to 5 microns. II
5. Sintered in an ambient atmosphere at a temperature of 1.100 to 1,200 C, and the sintered body is heated to a temperature of 900 to 1. It becomes popular in the range of o so o ℃, then 750 to 85 at a rate of 1 to 5 Q in
The mixture was slowly cooled to a temperature of 0° C., and then rapidly cooled in water.

Measurement result of magnetic properties, residual magnetic flux 'l! ! Degree Br1L40
GG, coercive force BHOa10006. Coercive force 'II (02
540000s.

Maximum energy hammer (BH) maw 1411 MG-O
It was s.

So ftrft K Co powder 244 &I, Sm20
z1t7. Weigh and mix 6~ of α metals, put this mixture into a rudubo, and heat it for 900~t in an inert gas atmosphere.
It was heated in a temperature range of 200° C. for at least 1 hour.

Subsequently, the temperature was increased to 550° C. or higher, and the mixture in the crucible was melted. After confirming that the mixture was completely melted, he poured the hot water into the ingot case. After the ingot case had cooled down, the ingot was analyzed and found to be Sm3t%, c by weight percentage.

It was 64% alloy. As a result of X-ray analysis, no presence of Sm103 could be confirmed. The residual Cartel amount percentage was α03% or less.

This alloy was pulverized to a size of 3 to 5 μm using a shet mill, and the fine powder was treated and magnetized under the same conditions as described above.

When I measured the magnetic percentage, it was 700G to the remaining M magnetic Song Dynasty Br.
1 Coercive force nHoa4000s, Coercive force zHo 25.0
000s maximum energy (BH) max 17.6
MG @ Os.

Comparing the conventional corporation and the present invention B, it is 9 in Table 1.

As is clear from Table 1, the percentage properties obtained are the same as those of the conventional coatings, or even far superior to those of the present invention.

Real m? l12゜Co powder 22 W4. SmaOx powder '3Kf, F* powder'
KfsCu powder L5Q, Hf powder t, I R4,c@Meta A, 4s Q were weighed and mixed, this mixture was placed in a crucible, and reduced and diffused under the same conditions as in Example 1 to obtain Sm2.
(Co-F...CumHf-containing 7 alloys are produced.

When this alloy was coarsely ground to 50 to 200 particles, washed and analyzed, it contained 7% Sm 2 N and C at a ratio of 6 parts per unit.

511G%, Fs114%, Cu Z 4%, Hf2.
It was 5%. In addition, the residual CaO was (LA-.X
As a result of l1lll scale analysis, the presence of some Sm1O1 was confirmed.

This alloy was pulverized to 5-5P1 with a jet mill, and Example 1
A molded body was made under the same conditions. This molded body is heated to a temperature of 9.
The sintered body is sintered in a temperature range of 1,200~1.11 (Ic) and quenched in water, and then aged at a temperature of s00~!00℃. was applied.

Measurement results of magnetic properties, residual magnetic flux'? EK Br v,s
o, oG, coercive force nHo5,1000e, and maximum energy 8[BH)max 2α5MG·0·.

So Kurata 4CC (1 powder 22 odor, SmzO @ powder I S
Kg, F@powder bKg, Cu powder 5sg4, Hf powder L I
Ti4. Ca metal t5Kf was weighed and mixed, this mixture was placed in a crucible, and reduction/diffusion and ffjS were performed under the same conditions as in Example 1. Analysis of the obtained ingot revealed that the at percentage was Sm 25L 6%, Co
5α2%, Fe157%, Cu Z7%, Hf2
．． It was 4% alloy.

As a result of X@ analysis, the presence of Sm20B could not be confirmed.

The residual CaO was less than α03 whisper in terms of am percentage.

As a result of measuring the magnetic properties, the residual magnetic flux density Br was 9.80
0G, coercive force BHO40000@, coercive force xH.

45,000 @, maximum energy (BH) mhx 21
.

It was MG・0・.

Table 2 shows a comparison between the conventional wide C and the invention.

As is clear from Table 2, the characteristics obtained are the same as those of the conventional wide one, or even far superior to those of the present invention.

As if to congratulate you above, V-Unexploded #! A is that the decrease in residual magnetic flux density due to residual wIeIt compounds, which was a conventional problem in the reduction diffusion method, is caused by mixing the R7C element oxide with the reducing agent and other alloys such as co, and reducing and diffusing this. By generating an alloy through a reaction and heating and melting it above the melting point, an alloy with magnetic properties equal to or higher than that of conventional melting methods can be obtained, and an inexpensive R element oxide is used as a raw material. It has advantages such as being able to be manufactured even in the case of various cases.

Deputy Masaru Takashi Honma ~16'.

Claims (1)

[Claims] In the production of Mizukuto 6 alloy (including intermetallic compounds) coated with the composition formula of RCo5 or RxCoty (R is one or more rare earth elements containing Y), at least %) 1
Mixing the oxide of the R element or more with a reducing agent and other alloy constituent elements such as Co, heating the mixture to reduce the oxide of the R element, and further interdiffusion with other 7C elements, Produces a successful RCog or RI Co 17 alloy,
A method for producing a permanent magnetic 6 alloy, which comprises melting the produced alloy.