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

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H01F 1/053 (2006.01) B22F 1/00 (2006.01) H01F 1/055 (2006.01) H01F 1/057 (2006.01) H01F 1/059 (2006.01) H01F 1/06 (2006.01)

Patent

CA 2034496

2034496 9016075 PCTABS00003 This invention relates to a process for producing a rare earth-containing material which is resistant to oxidation and non-pyrophoric comprising treating the rare earth containing material with a passivating gas at a temperature below the phase transformation temperature of the alloy. 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. If nitrogen is used as the passivating gas, the resultant rare earth material surface concentration of from 0.4 to about 26.8 atomic percent. If carbon dioxide is used as the passivating gas, the resultant rare earth containing material carbon surface concentration of from about 0.02 to about 15 atomic percent.

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