Methods of producing rare earth alloy magnet powder with superior magnetic anisotropy
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United States of America Patent
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Dec 15, 1998
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N/A
app pub date -
Mar 10, 1997
filing date -
Mar 10, 1997
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Expired
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Abstract
Methods of producing a rare earth alloy magnet powder having superior magnetic anisotropy and an aggregate of fine recrystallized structure of a R.sub.2 T.sub.14 M type intermetallic compound phase. In the methods, a R--T--M--A--Mg alloy material containing Mg is subjected to the following steps: elevating the temperature of the R--T--M--A--Mg alloy material from room temperature to a temperature up to 500.degree. C. in a vacuum or inert gas atmosphere; hydrogen-occluding treatment in which hydrogen is occluded in the R.ltoreq.T--M--A--Mg alloy material to promote phase transformation by elevating the temperature from room temperature to a predetermined temperature ranging from 500.degree. to 1,000.degree. C. and maintaining the elevated temperature under a hydrogen atmosphere or a mixed gas atmosphere of hydrogen and an inert gas; subsequently dehydrogenating treatment in which hydrogen is forcibly released from the R--T--M--A--Mg alloy material to promote phase transformation by maintaining the R--T--M--A--Mg alloy material at a predetermined temperature ranging from 500.degree. to 1000.degree. C. in a vacuum atmosphere of less than 1 Torr; cooling; and crushing.
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