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李家节,郭诚君,周头军,刘武杰,陈金水,刘仁辉,周慧杰,杨斌.热扩渗DyZn合金膜层对烧结钕铁硼磁性能与耐热性能的影响[J].稀有金属材料与工程(英文),2018,47(3):995~1000.[Li Jiajie,Guo Chengjun,Zhou Toujun,Liu Wujie,Chen Jinshui,Liu Renhui,Zhou Huijie and Yang Bin.Effects of Thermal Diffusing DyZn Alloy Film on the Magnetic Properties and Heat Resistance for Sintered NdFeB Magnets[J].Rare Metal Materials and Engineering,2018,47(3):995~1000.]
Effects of Thermal Diffusing DyZn Alloy Film on the Magnetic Properties and Heat Resistance for Sintered NdFeB Magnets
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Received:January 08, 2016  Revised:April 15, 2016
DOI:
Key words: Co-sputtering  Thermal diffusion  DyZn alloy  Sintered NdFeB
Foundation item:国家自然科学基金资助(项目号51561009);江西省高校科技落地计划项目(项目号KJLD14043);江西省青年科学基金计划项目(项目号20151BAB216005);江西省教育厅研究项目(项目号GJJ14448)
Author NameAffiliation
Li Jiajie,Guo Chengjun,Zhou Toujun,Liu Wujie,Chen Jinshui,Liu Renhui,Zhou Huijie and Yang Bin  
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Abstract:
      The DyZn films on the sintered NdFeB magnet surface were prepared through DC magnetron sputtering. The magnetic properties, temperature stability and microstructure of the magnets before and after the thermal diffusion treatment were compared. Under the circumstances of keeping the remanence invariable, the magnet coercivity enhanced significantly from 963.68 kA/m to 1544.60 kA/m with an increasing of 63.31% after DyZn thermal diffusion. The magnet temperature stability could be improved by grain boundary diffusion. The temperature coefficient of the remanence kept constant while that of the coercivity reduced from -0.5533% /K to -0.4885% /K in the range of 293K~453K. Dy elements diffusing along the grain boundary phase mainly aggregated between the grain boundary phase and the grain epitaxial layer via SEM and EPMA with EDS observation.The optimization of microstructure and composition of the grain boundary phase and the formed transition layer (Nd,Dy)2Fe14B between them are the main reasons which causing the coercivity to upgrade dramatically.