Method for producing particles for the production of permanent m

Details Method for producing particles for the production of permanent m Method for producing particles for the production of permanent m

1988-03-22

1991-02-05

Sheehan, John P.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder pretreatment

75352, 75359, 75364, 148301, 148302, B22F 918

Patent

active

049903071

ABSTRACT:
Particles for the production of permanent magents are obtained by producing an article having Ca and a rare earth oxide including at least Nd oxide. The article is heated to effect Ca rare earth oxide reduction. Thereafter, particles of -60 mesh or finer are formed from this article. Leaching of Ca from the particles is achieved by contacting the particles with an organic acid having at least 3 carbon atoms, preferably propionic or butanoic acid.

REFERENCES:
patent: 3826696 (1974-07-01), Cech
patent: 4689073 (1987-08-01), Nate et al.
patent: 4806155 (1989-02-01), Camp et al.

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