Microstructure, magnetic properties and diffusion mechanism of DyMg co-deposited sintered Nd-Fe-B magnets
Microstructure, magnetic properties and diffusion mechanism of DyMg co-deposited sintered Nd-Fe-B magnets
复制标题
DyMg共沉积烧结Nd-Fe-B磁体的显微组织、磁性能及扩散机制
DOI：
10.1016/j.jallcom.2019.153002
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发表时间：
2020-04-05
影响因子：
6.2
通讯作者：
Bin Yang
中科院分区：
文献类型：
--
作者：
Zhong, Shuwei;Yang Munan;Bin Yang
研究了DyMg共沉积和扩散对烧结NdFeB磁体磁性能和使用稳定性的影响。DyMg扩散后，样品的矫顽力由原始磁体的13.26kOe增加到18.21kOe。与单一Dy扩散相比，DyMg扩散磁体的Dy消耗量降低了39%。DyMg扩散磁体的热稳定性和耐腐蚀性显著提高。用扫描电子显微镜、电子探针和透射电子显微镜观察了合金的组织和元素分布。镁元素或Dy-Mg合金修复了损伤的晶界，在磁体中形成了低熔点扩散通道，改善了富Dy壳体的分布均匀性。除了主相磁晶各向异性的增加外，晶界相的优化也是有效提高矫顽力的关键因素。(C)2019爱思唯尔B.V.保留所有权利。
The effect of DyMg co-deposition and diffusion on magnetic properties and service stability of sintered Nd-Fe-B magnets was investigated in this paper. The coercivity increased from 13.26 kOe for original magnet to 18.21 kOe after DyMg diffusion. As compared to single Dy diffusion, the Dy consumption was reduced by 39% in DyMg-diffused magnets. The thermal stability and corrosion resistance of the DyMg-diffused magnet improved significantly. The microstructure and element distribution were observed by SEM, EPMA and TEM. Mg element or Dy-Mg alloy repaired the damaged grain boundary to form a low melting point diffusion channel in the magnet and improved the distribution uniformity of the Dy-rich shell. In addition to the increase of magnetocrystalline anisotropy of the main phase, the optimization of the grain boundary phase is found to be a key factor for the effective improvement of coercivity. (C) 2019 Elsevier B.V. All rights reserved.