Rare earth-containing magnets

Details Rare earth-containing magnets Rare earth-containing magnets

1984-03-30

1986-07-22

Sheehan, John P.

Specialized metallurgical processes, compositions for use therei

Compositions

Loose particulate mixture containing metal particles

75255, 75951, 148 3157, B22F 100

Patent

active

046017542

ABSTRACT:
Compositions for the production of rare earth-ferromagnetic metal permanent magnets comprise mixtures of rare earth-ferromagnetic metal alloy powder and a lesser amount of a powdered second-phase sintering aid, wherein there is added up to about 2 percent by weight of a particulate refractory oxide, carbide, or nitride additive. Permanent magnets are prepared by mixing the components, aligning the mixture in a magnetic field, pressing and sintering. The refractory material inhibits grain growth in the second phase during sintering, improving the magnetic properties of the major phase.

REFERENCES:
patent: 3625779 (1971-12-01), Cech
patent: 3682714 (1972-08-01), Martin
patent: 3723197 (1973-03-01), Buschow et al.
patent: 4043845 (1977-08-01), Dionne
patent: 4290826 (1981-09-01), Clegg

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