Investigation of the magnetic properties, microstructure and corrosion resistance of sintered Nd-Ce-Fe-B magnets with different Ce contents
Investigation of the magnetic properties, microstructure and corrosion resistance of sintered Nd-Ce-Fe-B magnets with different Ce contents
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不同Ce含量烧结Nd-Ce-Fe-B磁体的磁性能、显微组织和耐腐蚀性能研究
DOI：
10.1016/j.jmmm.2022.169477
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发表时间：
2022-05
影响因子：
2.7
通讯作者：
Wenqiang Zhao
中科院分区：
文献类型：
--
作者：
Fugang Chen;Hechang Han;Tieqiao Zhang;Sihan Liu;Yong Zhao;Xiaoli Wang;Dongpeng Wang;Wenqiang Zhao
分析了不同Ce含量（0、5、10、15wt%）的Nd-Ce-Fe-B磁体的磁性能、显微组织和耐蚀性能。当Ce从0 wt%增加到5 wt%时，矫顽力从1053 kA/m降低到912 kA/m。但当Ce从5wt%增加到10wt%时，其矫顽力几乎不变。当Ce进一步增加到15wt%时，矫顽力急剧下降到732 kA/m。随着Ce含量的增加，晶界相的分布得到优化，CeFe 2相的形成减弱了相邻2-14-1相晶粒间的磁耦合。2-14-1相在富Ce晶界相附近形成“核（低Ce）-壳（高Ce）”结构，富Ce的壳强化了Ce对合金磁性的稀释作用。Ce对Nd-Ce-Fe-B系永磁体矫顽力的影响可分为晶界相优化的正面效应和Ce稀释的负面效应。随着Ce含量的增加，合金的耐蚀性降低。当Ce增加超过10重量%时，耐腐蚀性急剧降低。研究结果为高性能Nd-Ce-Fe-B磁体的设计和制备提供了理论依据。
The magnetic properties, microstructure and anti-corrosion properties of Nd-Ce-Fe-B magnets with different Ce contents (0 wt%, 5 wt%, 10 wt% and 15 wt%) were analyzed. When the Ce increases from 0 wt% to 5 wt% the coercivity decreases from 1053 kA/m to 912 kA/m. But the coercivity almost keeps unchanged when Ce increases from 5 wt% to 10 wt%. When the Ce further increases to 15 wt% the coercivity decreases sharply to 732 kA/m. The distributions of the grain boundary phase are optimized with the increase of Ce due to the formation of CeFe2phase, which weakens the magnetic coupling between neighboring 2–14-1 phase grains. The “core (low Ce)-shell (high Ce)” structure of the 2–14-1 phase was formed near the Ce-rich grain boundary phases, and the shells enriched with Ce intensify the dilution effect of Ce on the coercivity. The effect of Ce on the coercivities of Nd-Ce-Fe-B magnets can be divided by the positive effect of the grain boundary phase optimization and the negative effect of Ce dilution. The corrosion resistance decreases with the increase of Ce. When the Ce increases above 10 wt% the corrosion resistance degrades sharply. The findings in this work help to design and fabricate Nd-Ce-Fe-B magnets with high performance.
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影响因子：
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