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烧结Nd-Fe-B磁体非稀土Al的晶界扩散研究
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1.南昌航空大学材料科学与工程学院;2.赣州富尔特电子股份有限公司;3.江西理工大学稀土磁性材料及器件研究所

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国家自然科学基金项目(51961027、51401103及51564037)、江西省重点研发项目(20181ACE50005)和江西省教育厅科技项目(GJJ170587)


Grain boundary diffusion of non-rare earth Al for sintered Nd-Fe-B
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1.School of Materials Science and Engineering,Nanchang Hangkong University;2.Institute for Rare Earth Magnetic Materials and Devices,Jiangxi University of Science and Technology

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    摘要:

    以Al粉作为扩散源,研究了不同晶界扩散工艺对Nd-Fe-B磁体微观结构和磁性能的影响。研究发现,570 oC/1 h扩散时,磁体的综合磁性能最佳,其矫顽力和磁能积分别为1131 kA/m和252 kJ/m3,较原始磁体分别提升了16%和9.6%,且磁体的温度稳定性也得到改善。微结构和成分分析研究表明,晶界扩散后,Al主要分布于晶间富稀土相,且其形貌由大块状进展为薄层状,界面也变得更为平直光滑,增强了对反磁化畴形核的抑制,减小了退磁场。此外,晶间富稀土相中的Al有助于腐蚀电位的提升,而腐蚀电流密度的降低则归因于富稀土相分布的变化。

    Abstract:

    Using Al powder as diffused source, the influence of grain boundary diffused processes on the microstructure and magnetic properties were investigated. It is found that the optimum magnetic properties including the coercivity of 1131 kA/m and the maximum energy product of 252 kJ/m3 can be achieved, increasing by 16% and 9.6%, respectively, meanwhile, the temperature stability is also improved. Microstructural investigation reveals that Al is mainly distributed in the intergranular RE-rich phase, and the morphology of RE-rich phase changes from large block to thin layer. Smoother and more straight interface can be obtained, which can restrain the nucleation of anti-magnetization domain, reducing the demagnetization field. In addition, the Al in the intergranular phase is beneficial in elevating the corrosion potential, and the decreased corrosion current density should be attributed to the changes of RE-rich phase distribution.

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侯育花,闫小童,陈诚,符小坤,葛现金,李伟,黄有林,罗军明,庞再升,钟震晨.烧结Nd-Fe-B磁体非稀土Al的晶界扩散研究[J].稀有金属材料与工程,2020,49(8):2760~2764.[Yuhua Hou, Xiaotong Yan, Cheng Chen, Xiaokun Fu, Xianjin Ge, Wei Li, Youlin Huang, Junming Luo, Pang Zaisheng, Zhong Zhenchen. Grain boundary diffusion of non-rare earth Al for sintered Nd-Fe-B[J]. Rare Metal Materials and Engineering,2020,49(8):2760~2764.]
DOI:10.12442/j. issn.1002-185X.20190639

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  • 收稿日期:2019-08-03
  • 最后修改日期:2019-09-06
  • 录用日期:2019-09-06
  • 在线发布日期: 2020-09-27
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