Rare-earth alloy powders for magnets and process for making magn

Details Rare-earth alloy powders for magnets and process for making magn Rare-earth alloy powders for magnets and process for making magn

1999-09-29

2000-10-24

Mai, Ngoclan

Metal treatment

Stock

Magnetic

148101, 419 30, H01F 1053

Patent

active

061361003

ABSTRACT:
A process for passivating rare-earth alloy powders such that magnets formed from the powders have fewer expansion defects is described. By exposing the rare-earth alloy powders to a humid atmosphere, rare-earth oxide impurities that could result in eruptions in the magnets are reduced. Magnets made from the passivated powder show fewer expansion defects than magnets made from unpassivated powder.

REFERENCES:
patent: 5244510 (1993-09-01), Bogatin
patent: 5286307 (1994-02-01), Anderson
patent: 5567891 (1996-10-01), Bogatin et al.
patent: 5781843 (1998-07-01), Anderson et al.

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