Abstract In this paper, the Rare-earth Iron Boron (RE-Fe-B) magnets were fabricated successfully by using the double main phase method through mixing the Neodymium Iron Boron (Nd-Fe-B) powders and Misch-metal Iron Boron (MM-Fe-B) powders with different ratio. Aiming at the nanocrystalline RE2Fe14B magnets prepared by using spark plasma sintering technology, phase structure and magnetic properties were investigated. It is found that the Misch-metal (MM) alloys promote the domain nucleation during the the process of magnetization reversal and then damage the coercivity (Hcj) of isotropic RE2Fe14B magnets, while the Hcj could still remain more than 1114.08 kA/m when the mass proportion of MM (simplified as: “a”) is 30%. Curie temperature and phase structure were also researched. Two kinds of mixed-solid-solution (MSS) main phases with different Lanthanum (La) and Cerium (Ce) content were believed to be responsible for the two curie temperature of the RE2Fe14B magnets with “a” ≥20%. This is resulted from the inhomogeneous elemental distribution of RE2Fe14B phase.

中文翻译：

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基于混合稀土的热变形磁体的相组成和磁性能

摘要 本文采用双主相法，将钕铁硼（Nd-Fe-B）粉体和混合金属铁硼混合，成功制备了稀土铁硼（RE-Fe-B）磁体。 MM-Fe-B) 不同比例的粉末。针对采用放电等离子烧结技术制备的纳米晶RE2Fe14B磁体，研究了相结构和磁性能。研究发现，混合金属（MM）合金在磁化反转过程中促进畴形核，进而破坏各向同性 RE2Fe14B 磁体的矫顽力（Hcj），而当MM（简写为：“a”）的质量比例为30%。居里温度和相结构也进行了研究。具有不同镧 (La) 和铈 (Ce) 含量的两种混合固溶体 (MSS) 主相被认为是导致 RE2Fe14B 磁体的两个居里温度“a”≥20% 的原因。这是由于 RE2Fe14B 相的元素分布不均匀所致。