| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a high performance iron group rare-earth permanent magnet which is superior in the heat resistance, in particular, in the thermal demagnetization characteristics. <P>SOLUTION: The iron group rare-earth permanent magnet has a composition formula represented by (Fe<SB>1-n</SB>T<SB>n</SB>)<SB>100-x-y-z-l</SB>(B<SB>1-p</SB>C<SB>p</SB>)<SB>x</SB>R<SB>y</SB>M1<SB>z</SB>M2<SB>l</SB>, and is substantially comprises an Nd<SB>2</SB>Fe<SB>14</SB>B-type crystal phase and a non-magnetic grain boundary phase. The M1 element mainly exists in the grain boundary phase. Here, T denotes one kind or more of elements selected from among a group consisting of Co and Ni; R denotes one kind or more of rare-earth elements containing Y (yttrium), M1 denotes at least one kind of element selected from among a group consisting of Zr, Nb, V, Mo, Cr, Hf, Ta and W; and M2 denotes at least one kind of element selected from among a group consisting of Si, Al, Ga, Cu, Ag, Au, Zn, Sn, Pb, In and Bi. Composition ratios x, y, z, l, n and p have a composition which satisfies 3≤x≤10 atom%, 10≤y≤12 atom%, 0.1≤z≤2 atom%, 0 ≤l≤5 atom%, 0≤n≤0.5, 0≤p≤0.5 and x/y≥0.5, respectively. <P>COPYRIGHT: (C)2007,JPO&INPIT |
