Rare-earth alloy powders for magnets and process for making magnets from rare-earth alloy powders
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United States of America Patent
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Oct 24, 2000
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N/A
app pub date -
Sep 29, 1999
filing date -
Sep 29, 1999
priority date (Note) -
Expired
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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.
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