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晶界添加Ho63.3Fe36.7 NdFeB再生磁体组织与性能的影响
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1.桂林电子科技大学 材料科学与工程学院 广西信息材料重点实验室,广西 桂林 541004;2.中国稀土(广西)金源新材料有限公司,广西 贺州 542603

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基金项目:

the National Key R&D Program of China (Grant No. 2016YFB0700901), the Natrual Science Foundation of China (Grant No. 51761007),the science and technology project of Guangxi (Grant Nos. 2017AD23031), Science and technology plan project of Fujian (No. 18I11010069)


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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    摘要:

    采用一种高效、绿色的物理方法对NdFeB废旧磁体表面进行清理并回收利用。通过晶界添加低熔点Ho63.3Fe36.7合金制备NdFeB再生磁体。在未添加Ho63.3Fe36.7的磁体中,没有足够的富Nd相隔离Nd2Fe14B相,从而导致磁体性能较差;随着Ho63.3Fe36.7合金的加入,晶界相变得清晰且连续。在质量分数2%Ho63.3Fe36.7添加量下,钕铁硼再生磁体获得最佳磁性能[(BH)max+Hcj=1756.07]。此时矫顽力增加123 kA/m(约提高9.1%),磁体的最大能积由290.94 kJ/m3下降到281.07 kJ/m3,而剩磁少量下降。通过对再生磁体显微组织和成分的分析可知,磁体晶界处形成了(Nd, Pr, Ho)2Fe14B壳层,这能够提高磁体的矫顽力。而X射线衍射分析表明,磁体I(006)/I(105)的衍射峰强度比从0.92提高到1.32。这说明磁体取向度提高,可以减弱对剩磁的影响,从而使得再生磁体在保持剩磁的同时提高磁体的矫顽力。

    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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孙前程,姚青荣,龙乾新,黄伟超,邓健秋,王江,饶光辉,周怀营.晶界添加Ho63.3Fe36.7 NdFeB再生磁体组织与性能的影响[J].稀有金属材料与工程,2021,50(12):4230~4235.[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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  • 收稿日期:2020-09-12
  • 最后修改日期:2021-11-24
  • 录用日期:2020-11-05
  • 在线发布日期: 2021-12-30
  • 出版日期: 2021-12-24