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发明公开
CN104112555A R-T-B系烧结磁铁 有权

R-T-B系烧结磁铁
摘要：
本发明提供与现有的R-T-B系磁铁相比较，不会显著降低磁特性，并且在温度特性方面表现优异的永久磁铁。通过对成为原料的R-T-B系磁铁施行长时间热处理，从而将主相颗粒核壳化，所述R-T-B系磁铁包含具有核部和被覆所述核部的壳部的主相颗粒，当使所述核部中的R1和Y的质量浓度分别为αR1、αY且使所述壳部中的R1和Y的质量浓度分别为βR1、βY时，所述壳部中的R1和Y的质量浓度比率（βR1/βY=B）与所述核部中的R1和Y的质量浓度比率（αR1/αY=A）之比（B/A）为1.1以上，由此，防止添加Y所引起的矫顽力降低，且从添加Y所引起的温度特性提高效果来提高高温下的磁特性。
摘要（英）：

The present invention provides a permanent magnet with excellent temperature characteristics and without magnetic properties significantly decreased compared to the existing 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 main phase grains will turn into core-shell like, and said R-T-B based magnet comprises main phase grains having core portion and shell portion that covers the core. When the mass concentration of RI and Y in the core portion is set as [alpha]R1 and [alpha]Y respectively and the mass concentration of R1 and Y in the shell portion is set as [beta]R1 and [beta]Y respectively, the ratio (B/A) between the mass concentration ratio of R1 to Y in the shell portion ([beta]R1/[beta]Y=B) and the mass concentration ratio of R1 to Y in the core portion ([alpha]R1/[alpha]Y=A) is 1.1 or more. Thus, the decrease of coercivity caused by Y addition is prevented, and the increase effect of temperature characteristics caused by addition of Y will lead to improve the magnetic properties under high temperature.

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