Method for making rare earth-containing magnets

Details Method for making rare earth-containing magnets Method for making rare earth-containing magnets

1986-04-28

1988-10-11

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148104, 419 12, 419 13, 419 14, 419 19, 419 20, 419 38, H01F 102

Patent

active

047769025

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: 3701695 (1972-10-01), Buschow et al.
patent: 4043845 (1977-08-01), Dionne
patent: 4081297 (1978-03-01), Nagel et al.
patent: 4135953 (1979-01-01), Nagel et al.
patent: 4211585 (1980-07-01), Inomata et al.
patent: 4497672 (1985-02-01), Tawara et al.

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