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Home > Archive>Volume 50, Issue 12, 2021 >4230-4235. DOI:10.12442/j.issn.1002-185X.20200697
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Effect of Adding Ho63.3Fe36.7 to Grain Boundaries on Structure and Properties of Regenerated NdFeB Magnets
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Affiliation:

1.Guangxi Key Laboratory of Information Materials, School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China;2.China Rare Metals and Rare Earth (Guangxi) Jinyuan New Materials Co., Ltd, Hezhou 542603, China

Fund Project:

National Key R&D Program of China (2016YFB0700901); National Natural Science Foundation of China (51761007); Science and Technology Project of Guangxi (2017AD23031); Science and Technology Plan Project of Fujian (18I11010069)

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    Abstract:

    A high-efficiency and green physical method was proposed to clean the surface of NdFeB waste magnets for recycling. NdFeB regenerated magnets were fabricated by adding low-melting point Ho63.3Fe36.7 alloy to grain boundaries. Results show that in magnets without Ho63.3Fe36.7, there are insufficient Nd-rich phases to isolate the Nd2Fe14B phase, leading to poor magnet performance. With the addition of Ho63.3Fe36.7 alloy, the grain boundary phases become clear and concatenated. Optimal magnetic energy [(BH) max+Hcj=1756.07] can be obtained by adding 2wt% Ho63.3Fe36.7 to the magnet. Further, the coercivity increases by 123 kA/m (approximately 9.1%), the maximum magnetic energy product decreases from 290.94 kJ/m3 to 281.07 kJ/m3, and remanence decreases slightly. Through analysis of the microstructure and composition, it can be seen that the (Nd, Pr, Ho)2Fe14B shell layers form at the grain boundary, which enhances the coercivity of the magnet. X-ray diffraction analysis suggests that the diffraction peak intensity ratio of magnet I(006)/I(105) increases from 0.92 to 1.32, which indicates that the alignment degree is improved and the influence on remanence is weakened. Therefore, regenerated magnets can possess improved coercivity while maintaining magnetic remanence.

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[Sun Qiancheng, Yao Qingrong, Long Qianxin, Huang Weichao, Deng Jianqiu, Wang Jiang, Rao Guanghui, Zhou Huaiying. Effect of Adding Ho63.3Fe36.7 to Grain Boundaries on Structure and Properties of Regenerated NdFeB Magnets[J]. Rare Metal Materials and Engineering,2021,50(12):4230~4235.]
DOI：10.12442/j. issn.1002-185X.20200697

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History
  • Received:September 12,2020
  • Revised:November 24,2021
  • Adopted:November 05,2020
  • Online: December 30,2021
  • Published: December 24,2021

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