Sintered permanent magnet
AssigneeTDK Corporation
InventorsKazunori Hirose, Shinya Hashimoto, Koichi Yajima
Life of this patent
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Abstract
The sintered permanent magnet of the invention has a composition of the formula: (R.sub.1-.alpha. Dy.sub..alpha.).sub.a Fe.sub.(100-a-b-c-d-e) B.sub.b Al.sub.c Sn.sub.d M.sub.e wherein R is at least one rare earth element exclusive of Dy, M is at least one element selected from the group consisting of Co, Nb, W, V, Ta, Mo, Ti, Ni, Bi, Cr, Mn, Sb, Ge, Zr, Hf, Si, In, and Pb, and 0.01.ltoreq..alpha.0.5, 8.ltoreq.a.ltoreq.30, 2.ltoreq.b.ltoreq.28, 0.2.ltoreq.c.ltoreq.2, 0.03.ltoreq.d.ltoreq.0.5, and 0.ltoreq.e.ltoreq.3. The sintered permanent magnet of R-Fe-B system has excellent thermal stability and high maximum energy product.
Claims2
A sintered permanent magnet having a composition of the formula:
- (R.sub.1-.alpha. Dy.sub..alpha.).sub.a Fe.sub.(100-a-b-c-d-e) B.sub.b Al.sub.c Sn.sub.d M.sub.e
- wherein
- R is at least one rare earth element exclusive of Dy,
- M is at least one element selected from the group consisting of Co, Nb, W, V, Ta, Mo, Ti, Ni, Bi, Cr, Mn, Sb, Ge, Zr, Hf, Si, In, and Pb, and
- letters .alpha., a, b, c, d, and e are:
- 0.01.ltoreq..alpha..ltoreq.0.5,
- 8.ltoreq.a.ltoreq.30,
- 2.ltoreq.b.ltoreq.28,
- 0.2.ltoreq.c.ltoreq.2,
- 0.03.ltoreq.d.ltoreq.0.5, and
- 0.ltoreq.e.ltoreq.3.
Dependencies are inferred from the claim text.