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发明授权
CN104112559B R-T-B系烧结磁铁 有权

R-T-B系烧结磁铁
摘要：
本发明提供一种与现有的R‑T‑B系磁铁相比较不显著降低磁特性且与镀层的密接强度优异的永久磁铁。在作为R必须有R1和Ce的R‑T‑B系磁铁中，通过对作为原料的R‑T‑B系磁铁施行长时间热处理来使主相颗粒核壳化，当令核部中的R1和Ce的质量浓度分别为αR1、αCe且令所述壳部中的R1和Ce的质量浓度分别为βR1、βCe时，所述壳部中的R1和Ce的质量浓度比率(βR1/βCe＝B)与所述核部中的R1和Ce的质量浓度比率(αR1/αCe＝A)之比(B/A)为1.1以上，由此，通过Ce添加而提高与镀层的密接强度，并且抑制矫顽力下降。
摘要（英）：

The present invention provides a permanent magnet with excellent adhesion strength with plated layer and without significant decrease in magnetic properties, compared to the conventional R-T-B based magnet. By means that the R-T-B based magnet as the raw material is applied to heating treatment for a long time, the major phase grains will form core-shell like structures in the R-T-B based magnet in which R1 and Ce are included as an essential of R. When the mass concentration of R1 and Ce in the core portion is set as αR1 and αCe respectively and that of R1 and Ce in the shell portion is set as βR1 and βCe respectively, the ratio (B/A) between the mass concentration ratio of R1 to Ce in the shell portion (βR1/βCe=B) and that of R1 to Ce in the core portion (αR1/αCe=A) is 1.1 or more.

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