Method for manufacturing a rare earth magnetic powder having hig

Details Method for manufacturing a rare earth magnetic powder having hig Method for manufacturing a rare earth magnetic powder having hig

1998-07-13

1999-11-30

Jenkins, Daniel J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder pretreatment

419 36, 419 48, 419 49, 148513, B22F 100, B22F 312, B22F 314

Patent

active

059937327

ABSTRACT:
An R--T--M alloy material, wherein R is at least one rare earth metal including Y, T is Fe or an Fe component partially replaced by Co or Ni, M is B or a B component partially replaced by C as primary components is prepared by heating the alloy at a temperature from room temperature to a specific temperature of less than 500.degree. C. in a non-oxidizing atmosphere and holding it at the given temperature, if necessary; performing hydrogenation by holding the alloy in a hydrogen atmosphere or a mixed gas atmosphere of hydrogen and an inert gas at a specific temperature in the range of 500-1,000.degree. C.; medial annealing the alloy by holding the R--T--M alloy after the hydrogenation step in an inert gas atmosphere at a specific temperature in the range of 500-1,000.degree. C.; and dehydrogenating the alloy by holding the alloy in a vacuum of less than 1 Torr for dehydrogenation, and then cooling the alloy.

REFERENCES:
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patent: 5643491 (1997-07-01), Honkura et al.
patent: 5851312 (1998-12-01), Honkura et al.
patent: 5865873 (1999-02-01), Sekine et al.
patent: 5886070 (1999-03-01), Honkura et al.
patent: 5886077 (1999-03-01), Takahashi et al.

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