Effect of intergranular phase proportion in sintered Nd-Fe-B magnets on subsequent grain boundary diffusion using Tb-Cu alloy

Xie, Yuheng; Cao, Shuai; Cao, Xiaoyuan; Wu, Tengfei; Kou, Mingpeng; Jia, Zhi; Ding, Guangfei; Guo, Sheng; Chen, Renjie; Liu, Xincai; Yan, Aru; Xu, Zhi

doi:10.1016/j.jallcom.2022.167562

Cited by 16 publications

(1 citation statement)

References 25 publications

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“…[1][2][3][4][5] With expanding demand, the need for information on the magnetic properties and corrosion resistance of NdFeB continues. [5][6][7][8][9] Studies have shown that optimizing the microstructure of magnets is a common approach to improving magnetic properties. [10][11][12][13][14] Corrosion resistance during practical application is another important indicator for evaluating NdFeB magnets.…”

Section: Introductionmentioning

confidence: 99%

Effect of In doping on the evolution of microstructure, magnetic properties and corrosion resistance of NdFeB magnets

Li 李,

Fan 范,

Jia 贾

et al. 2024

Chinese Phys. B

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The grain boundary phase affects the magnetic properties and corrosion resistance of sintered NdFeB magnets. In this work, a small amount of Indium (In) was added to the NdFeB magnet by induction melting to systematically investigate its effect on the evolution of the microstructure, magnetic properties, and corrosion resistance of the NdFeB magnet. The microstructural analysis illustrated that minor In-addition generated more grain boundary phases and an abundant amorphous phase at the triple junction grain boundary. While the addition of In element failed to enhance the magnetic isolation effect between adjacent matrix grains, fortuitously, its incorporation elevated the electrochemical potential of the In-containing magnets. Besides, during corrosion, an In-rich precipitate phase formed, hindering the ingress of the corrosive medium into the magnet. Consequently, this significantly bolstered the corrosion resistance of sintered NdFeB magnets. The phase formation, magnetic properties, and corrosion resistance of In-doped NdFeB magnets are detailed in this work, which provides a new prospect for the preparation of high-performance sintered NdFeB magnets.

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