Permanent magnet
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United States of America Patent
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Nov 5, 2002
Grant Date -
Sep 13, 2001
app pub date -
Dec 28, 2000
filing date -
Dec 28, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is a permanent magnet which comprises an alloy containing a hard magnetic phase having a ThMn12 type tetragonal structure and a nonmagnetic phase. The alloy is represented by a general formula given below: [R.sub.1-a (M1).sub.a ][T.sub.1-b-c (M2).sub.b (M3).sub.c ].sub.d x.sub..alpha. where R is at least one rare earth element (including Y), Ml is at least one element selected from the group consisting of Zr and Hf, T is at least one element selected from the group consisting of Fe, Co and Ni, M2 is at least one element selected from the group consisting of Cu, Bi, Sn, Mg, In and Pb, M3 is at least one element selected from the group consisting of Al, Ga, Ge, Zn, B, P and S, X is at least one element selected from the group consisting of Si, Ti, V, Cr, Mn, Nb, Mo, Ta and W, and the atomic ratios of a, b, c, d and .alpha. fall within the ranges of 0.ltoreq.a.ltoreq.0.6, 0.01.ltoreq.b.ltoreq.0.20, 0.ltoreq.c.ltoreq.0.05, 6.ltoreq.d.ltoreq.11, and 0.5.ltoreq..alpha..ltoreq.2.0.
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