Rare earth-containing magnets

Details Rare earth-containing magnets Rare earth-containing magnets

1988-01-25

1990-01-02

Sheehan, John P.

Metal treatment

Stock

Magnetic

75232, 75235, 75236, 75237, 75238, 75239, 75240, 75244, 75246, H01F 104

Patent

active

048910783

ABSTRACT:
Compositions for the production of rare earth-ferromagnetic-metal permanent magnets comprise mixtures of rear 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: 3701695 (1972-10-01), Buschow et al.
patent: 3826696 (1974-07-01), Cech
patent: 4043845 (1977-08-01), Dionne
patent: 4290826 (1981-09-01), Clegg

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