Magnetic properties, corrosion resistance, and microstructure of Nd-Fe-B sintered magnets with Tb6Fe13Cu addition
Magnetic properties, corrosion resistance, and microstructure of Nd-Fe-B sintered magnets with Tb6Fe13Cu addition
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添加 Tb6Fe13Cu 的 Nd-Fe-B 烧结磁体的磁性能、耐腐蚀性能及显微组织
DOI：
10.1016/j.jmrt.2021.10.051
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发表时间：
2021-10
期刊：
影响因子：
--
通讯作者：
Huaiying Zhou
中科院分区：
文献类型：
--
作者：
Jia Li;Shihui Li;Qingrong Yao;Weichao Huang;Jianqiu Deng;JiangWang;Guanghui Rao;Huaiying Zhou
通过磁性测量装置、电化学方法和显微组织分析，研究了添加Nd-Fe-B的tb6fe13cu烧结磁体的磁性能、耐蚀性和显微组织。结果表明，掺杂Tb6Fe13Cu不仅能有效提高磁体的本征矫顽力，还能显著提高磁体的耐腐蚀性。当Tb6Fe13Cu的添加量增加到3 wt%时，磁体的固有矫顽力从15.01 ~ 21.40 kOe，而剩余物和最大能积略有下降。还发现，随着添加量的增加，磁体的腐蚀电位逐渐变为正值。进一步的研究表明，矫顽力和耐腐蚀性的显著增强是由于形成了富铽（Nd, Pr, Tb）2Fe14B壳结构，晶间相的分布/形貌优化，以及更稳定的富re相。
We investigated the magnetic properties, corrosion resistance, and microstructure of Tb6Fe13Cu-added Nd–Fe–B sintered magnets through the magnetic measurement device, electrochemical method, and microstructure analysis. The results show that doping Tb6Fe13Cu can not only effectively improve the intrinsic coercivity but also significantly improve the corrosion resistance of the magnet. An intrinsic coercivity from 15.01 to 21.40 kOe is achieved in magnet by increasing the additive amounts of Tb6Fe13Cu to 3 wt%, while the remanence and the maximum energy product decreased slightly. It was also found that as the amount of addition increases, the corrosion potential of the magnet gradually becomes positive. Further investigations reveal that the remarkable enhancement in coercivity and corrosion resistance was owing to the formation of a Tb-rich (Nd, Pr, Tb)2Fe14B shell structure, the optimization in distribution/morphology of intergranular phases, and the more stable RE-rich phase.
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