Magnetic materials and process for producing the same

Details Magnetic materials and process for producing the same Magnetic materials and process for producing the same

1991-07-18

1993-09-14

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148105, 427127, 427215, 4272554, 427399, 428403, 428547, 419 12, 419 13, 419 14, 419 29, 419 30, 419 34, 419 35, 419 38, 419 44, 419 55, H01F 102

Patent

active

052445100

ABSTRACT:
This invention relates to a process for producing a rare earth-containing powder comprising crushing a rare earth-containing alloy in a passivating gas at a temperature from ambient temperature to a temperature below the phase transformation temperature of the material.
Additionally, this invention relates to a process for producing a rare earth-containing powder compact comprising crushing a rare earth-containing alloy in water, compacting the crushed alloy material, drying the compacted alloy material at a temperature below the phase transformation temperature of the material, and treating the compacted alloy material with a passivating gas at a temperature from ambient temperature to a temperature below the phase transformation temperature of the material.
Rare earth-containing alloys suitable for use in producing magnets utilizing the powder metallurgy technique, such as Nd-Fe-B and Sm-Co alloys, can be used. The passivating gas can be nitrogen, carbon dioxide or a combination of nitrogen and carbon dioxide.
The present invention further relates to the production of a permanent magnet comprising the above steps, and then sintering the compacted material at a temperature of from about 900.degree. C. to about 1200.degree. C., and heat treating the sintered material at a temperature of from about 200.degree. C. to about 1050.degree. C.

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