The strategy of solid-liquid phase separation diffusion with DyH3 to approach a trade-off between properties and cost for sintered Nd-Fe-B magnets
The strategy of solid-liquid phase separation diffusion with DyH3 to approach a trade-off between properties and cost for sintered Nd-Fe-B magnets
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DOI：
10.1016/j.jallcom.2023.171297
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发表时间：
2023-07
影响因子：
6.2
通讯作者：
Haihui Wu;Zhanjia Wang;Weiqiang Liu;Y. Qin;M. Ji;Ruihua Du;Yuqing Li;Dongtao Zhang;M. Yue;X. Yi;Youhao Liu;S. Zha
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文献类型：
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作者：
Haihui Wu;Zhanjia Wang;Weiqiang Liu;Y. Qin;M. Ji;Ruihua Du;Yuqing Li;Dongtao Zhang;M. Yue;X. Yi;Youhao Liu;S. Zha
研究烧结钕铁硼磁体在晶界扩散（GBD）中的性能与成本之间的权衡有助于扩大其应用范围。本研究以dyh3纳米粉体为扩散源，采用固液相分离扩散法制备了GBD Nd-Fe-B磁体。从液相扩散（LPD）温度、磁特性、显微结构、扩散系数、畴形貌等方面与传统固液同步扩散（SimD）磁体进行了研究和比较。并与TbH3SepD磁体进行了成本计算和比较。确定了dyh3的最佳LPD温度为625℃。与SimD磁体相比，Dy在SepD磁体中的LPD速率更快，扩散深度更深，达到1200µm。因此，SepD磁体发展出更多的核壳结构。此外，SepD还可以防止磁体表面反核-壳层的形成。结果表明，SepD磁体具有较高的综合磁性能和矫顽力温度稳定性。令人印象深刻的是，与TbH3SepD磁体相比，DyH3SepD磁体每公斤磁体的每k矫顽力增强成本可以降低50%以上。
Approach a trade-off between properties and cost for sintered Nd-Fe-B magnets in grain boundary diffusion (GBD) helps widen their application. In this study, we fabricated GBD Nd-Fe-B magnets via solid-liquid phase separation diffusion (SepD) with DyH3nanopowder as the diffusion source. Investigations and comparisons with the traditional solid-liquid phase simultaneous diffusion (SimD) magnets were made regarding the liquid phase diffusion (LPD) temperature, magnetic characteristics, microstructures, diffusion coefficient, and domain morphology of SepD magnets. In addition, the cost was calculated and compared with TbH3SepD magnets. It is determined that the optimal LPD temperature of DyH3was 625 °C. Compared to the SimD magnet, Dy had a faster LPD rate in the SepD magnet, which leads to a deeper diffusion depth of 1200 µm. Consequently, the SepD magnet develops more core-shell structures. Additionally, SepD could prevent the development of anti-core-shell formations in the magnet's surface region. As a result, the SepD magnet had higher comprehensive magnetic properties and coercivity temperature stability. Impressively, compared to TbH3SepD magnets, the cost of per kOe coercivity enhancement for per kilogram magnets of DyH3SepD magnets can be reduced by more than 50 %.