Metal treatment – Stock – Magnetic
Patent
1994-05-31
1995-11-28
Sheehan, John
Metal treatment
Stock
Magnetic
252 6254, H01F 1055
Patent
active
054704006
ABSTRACT:
This invention relates to a process for producing a non-pyrophoric, corrosion resistant rare earth-containing material capable of being formed into a polymer bonded permanent magnet comprising forming particles from a rare earth-containing alloy, and treating the alloy with a passivating gas comprised of nitrogen, carbon dioxide or a combination of nitrogen and carbon dioxide at a temperature below the phase transformation temperature of the alloy, and heat treating the alloy to produce material having a coercivity of at least 1,000 Oersteds. Rare earth-containing alloys suitable for use in producing magnets, such as Nd--Fe--B and Sm--Co alloys, can be used. If nitrogen is used as the passivating gas, the resultant powder particles have a nitrogen surface concentration of from about 0.4 to about 26.8 atomic percent. Moreover, if carbon dioxide is used as the passivating gas, the resultant powder particles have a carbon surface concentration of from about 0.02 to about 15 atomic percent. The particles made in accordance with the present invention are capable of being aligned by a magnetic field to produce an anisotropic polymer bonded permanent magnet.
REFERENCES:
Translation of Japanese Kokai 63-247504, Dec. 5, 1988.
Bogatin Yakov
Greenwald Frank S.
Ormerod John
Robinson Mark
Dee James D.
Sheehan John
SPS Technologies, Inc.
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