Permanent magnet material containing a rare-earth element, iron, nitrogen and carbon
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United States of America Patent
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Feb 24, 1998
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N/A
app pub date -
Feb 15, 1995
filing date -
Aug 21, 1992
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Expired
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Abstract
Magnetic materials containing a rare earth metal, and iron or a similar metal, as well as nitrogen and carbon, are produced by gas absorbing nitrogen and carbon sequentially into a parent intermetallic compound; the resulting magnetic materials have high T.sub.c, .mu..sub.o M.sub.s and .mu..sub.o H.sub.A, are essentially free of .alpha.-Fe, and have a coercivity at 300.degree. K. of at least 1.5 T. Anisotropic magnetic materials are produced by pretreating the intermetallic compound, which contains carbon, by powder sintering or oriented hot shaping, followed by nitriding and/or carbiding.
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