Method of forming a rare earth-cobalt type magnetic powder for r

Details Method of forming a rare earth-cobalt type magnetic powder for r Method of forming a rare earth-cobalt type magnetic powder for r

1988-06-13

1989-09-05

Sheehan, John P.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 05BA, 420435, 148101, C22C 104

Patent

active

048635111

ABSTRACT:
A rare earth element-cobalt (RCo.sub.5) type magnetic powder suitable for the manufacture of a resinous magnet is produced by a method comprising the steps of mixing the oxides of the rare earth elements consisting of Sm, a first member comprising at least one element selected from between La and Ce, and a second member comprising at least one element selected from between Pr and Nd with a reducing agent and cobalt powder, heating the resulting mixture in the normal-pressure atmosphere of an inert gas to a temperature in the range of 900.degree. to 1,100.degree. C., then elevating the temperature of the mixture to a level in the range of 1,150.degree. to 1,200.degree. C., subsequently cooling the heated mixture to 800.degree. C. at a temperature decreasing rate in the range of 1.degree. to 5.degree. C./minute, lowering the temperature from 800.degree. C. to 700.degree. C. at a temperature decreasing rate of not less than 10.degree. C./minute, cooling the mixture further to a level in the range of 400.degree. to 200.degree. C., then retaining the mixture at the level for a period in the range of 1 to 10 hours, subsequently cooling the mixture to normal room temperature, placing the resulting product of heat treatment in
water thereby converting the product into a slurry, and treating the slurry with water and an aqueous acid solution. The magnetic powder is characterized by comprising (1) 33 to 35.5% by weight of rare earth elements consisting of 1.5 to 5% by weight of the first member, 0.3 to 8% by weight of the second member, and the balance of Sm and (2) the balance substantially of cobalt, respectively based on the total amount of the produced powders and possessing an average particle diameter in the range of 5 to 10 .mu.m.

REFERENCES:
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patent: 3928089 (1975-12-01), Cech
patent: 4090892 (1978-05-01), Klein et al.
patent: 4144105 (1979-03-01), Gaiffi et al.
patent: 4382061 (1983-05-01), Herget et al.
patent: 4664723 (1987-05-01), Ishii et al.
patent: 4689073 (1987-08-01), Nate et al.

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