Rare earth magnet and method for making same
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United States of America Patent
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Mar 4, 2003
Grant Date -
Feb 14, 2002
app pub date -
Jul 10, 2001
filing date -
Jul 10, 2000
priority date (Note) -
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Abstract
A rapidly solidified alloy is produced by quenching and solidifying a melt of an alloy having a general formula represented by (Fe.sub.1-m T.sub.m).sub.100-x-y-z Q.sub.x R.sub.y M.sub.z where T denotes at least one kind of element selected from the group consisting of Co and Ni, Q denotes at least one kind of element selected from the group consisting of B and C, R denotes at least one kind of rare earth element, and M denotes at least one kind of element selected from the group consisting of Nb and Mo, and the mole fractions x, y, z, and m respectively satisfy 2.ltoreq.x.ltoreq.28 (atom %), 8.ltoreq.y.ltoreq.30 (atom %), 0.1 .ltoreq.z<1.0 (atom %), and 0.ltoreq.m.ltoreq.0.5 (atom %). The rapidly solidified alloy is then pulverized and sintered to manufacture a rare earth permanent magnet. The cooling rate is controlled to be in the range of 10.sup.2 K/sec to 10.sup.4 K/sec, so that the alloy structure is uniformly fine and the added element M is uniformly dispersed.
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