Magnetic properties and microstructure of sintered NdFeB magnets with intergranular addition of Ni powders
Magnetic properties and microstructure of sintered NdFeB magnets with intergranular addition of Ni powders
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DOI：
10.1016/j.jallcom.2017.08.061
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发表时间：
2017-12
影响因子：
6.2
通讯作者：
Cui Xigui;W. Xiaoli;G. Yin;C. Cui;C. Xia;T. Ma;C. Wang;B. Peng;Junli Pan;P. Mei
中科院分区：
文献类型：
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作者：
Cui Xigui;W. Xiaoli;G. Yin;C. Cui;C. Xia;T. Ma;C. Wang;B. Peng;Junli Pan;P. Mei
本文旨在提高烧结钕铁硼磁体的磁性能。采用晶间添加法将Ni粉添加到Nd-Fe-B合金中，研究了Ni粉对磁体显微组织和磁性能的影响。添加适量的Ni（0.3wt%），可显著提高Nd-Fe-Nb-B-B磁体的本征矫顽力Hcj，而最大磁能积（BH）max仅略有下降。显微组织和成分分析表明，Ni原子不仅进入基体相，但也集中在晶间区，无论是作为含Ni的富Nd相或作为Ni颗粒。这与热力学计算结果一致。并初步提出了沿晶添加Ni粉的烧结机理。这些结果可为提高烧结Nd-Fe-B磁体的磁性能提供参考。
This paper aims to improve the magnetic properties of sintered Ndsingle bondFesingle bondB magnet. Ni powders were added to the Ndsingle bondFesingle bondB magnet through intergranular addition, and their effects on the microstructure and magnetic properties of the magnet were investigated. By adding a proper amount of Ni (0.3 wt%), the intrinsic coercivityHcjof Ndsingle bondFesingle bondB magnet is significantly improved with only a slight decrease in the remanenceBrand the maximum energy product (BH)max. The microstructural and compositional analyses reveal that Ni atoms not only enter the matrix phase but also concentrate in the intergranular regions either as Ni-containing Nd-rich phase or as Ni particles. This is consistent with the thermodynamic calculation results. Furthermore, a sintering mechanism of magnet with intergranular addition of Ni powders is tentatively proposed. These results may provide a reference for improving the magnetic properties of sintered Ndsingle bondFesingle bondB magnets.