Abstract Ce-Fe-B spark plasma sintered (SPSed) magnets prepared with different ratio of alloys of Ce-Fe-B and Pr-Nd-Fe-B by dual alloy method are investigated in this paper. As expected, the remanent magnetization Jr, coercivity Hci and maximum energy product (BH)max of SPSed magnets increase obviously with increasing weight percentage of Pr-Nd-Fe-B alloy. The magnetic properties of Jr = 0.71 T, Hci = 915 kA/m, (BH)max = 72 kJ/m3 are obtained for the SPSed magnets with 80 wt% Pr-Nd-Fe-B alloy. There are three Curie temperatures in this type magnet, which implies the coexistence of three hard magnetic phases. The second Curie temperature depends on the Pr-Nd-Fe-B content. With increasing Pr-Nd-Fe-B alloy content, the volume fraction and width of coarse grain zone decrease. It is shown by the microstructure analysis that the rare earth elements diffuse during sintering process resulting in the formation of Pr-Nd-Ce-Fe-B hard magnetic phase. The intergranular exchange coupling strength is enhanced with increasing Pr-Nd-Fe-B content. The present research may be a potential reference for further research and development of this type Ce-containing nanocrystalline permanent magnetic materials.

中文翻译：

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双合金法多主相Ce-Fe-B放电等离子体烧结磁体的组织和磁性能

摘要 本文研究了用不同比例的Ce-Fe-B 和Pr-Nd-Fe-B 合金通过双合金法制备的Ce-Fe-B 放电等离子体烧结(SPSed) 磁体。正如预期的那样，SPSed 磁体的剩磁 Jr、矫顽力 Hci 和最大能积 (BH)max 随着 Pr-Nd-Fe-B 合金重量百分比的增加而明显增加。对于具有 80 wt% Pr-Nd-Fe-B 合金的 SPSed 磁体，获得了 Jr = 0.71 T、Hci = 915 kA/m、(BH)max = 72 kJ/m3 的磁性能。这种磁体具有三个居里温度，这意味着三个硬磁相共存。第二居里温度取决于 Pr-Nd-Fe-B 含量。随着Pr-Nd-Fe-B合金含量的增加，粗晶区的体积分数和宽度减小。微观结构分析表明，稀土元素在烧结过程中发生扩散，形成Pr-Nd-Ce-Fe-B硬磁相。随着Pr-Nd-Fe-B含量的增加，晶间交换耦合强度增强。本研究可为此类含Ce纳米晶永磁材料的进一步研究和开发提供潜在的参考。