Rare earth magnet and method for manufacturing the same
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United States of America Patent
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N/A
Issued Date -
May 16, 2002
app pub date -
Sep 19, 2001
filing date -
Sep 19, 2000
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
Rare earth alloy powder having an oxygen content of 50 to 4000 wt. ppm and a nitrogen content of 150 to 1500 wt. ppm is compacted by dry pressing to produce a compact. The compact is impregnated with an oil agent and then sintered. The sintering process includes a first step of retaining the compact at a temperature of 700.degree. C. to less than 1000.degree. C. for a period of time of 10 to 420 minutes and a second step of permitting proceeding of sintering at a temperature of 1000.degree. C. to 1200.degree. C. The average crystal grain size of the rare earth magnet after the sintering is controlled to be 3 .mu.m to 9 .mu.m.
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