High-efficiency utilization of Tb in enhancing the coercivity of Nd-Fe-B magnets by multicomponent Tb70-xPrxCu10Al10Zn10 (x=0-30) film diffusion
High-efficiency utilization of Tb in enhancing the coercivity of Nd-Fe-B magnets by multicomponent Tb70-xPrxCu10Al10Zn10 (x=0-30) film diffusion
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DOI：
10.1016/j.jallcom.2022.163619
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发表时间：
2022-01-08
影响因子：
6.2
通讯作者：
Zhang, Jian
中科院分区：
文献类型：
--
作者：
Huang, Min;Qiu, Zhiqiang;Zhang, Jian
采用磁控溅射系统研究了多组分Tb70-xPrxCu10Al10Zn10 （x = 0-30）薄膜扩散对烧结Nd-Fe-B磁体微观结构和磁性能的影响。Tb40Pr30Cu10Al10Zn10、Tb60Pr10Cu10Al10Zn10、Tb(70)Cu10Al(10)Zn（10）和Tb处理后的矫顽力分别从11.5 kOe、18.8 kOe、19.8 kOe和17.8 kOe显著提高。多组分薄膜扩散磁体的剩余量和最大磁能积均高于Tb扩散磁体。其中，Tb40Pr30Cu10Al10Zn10、Tb60Pr10Cu10Al10Zn10和Tb70Cu10Al10Zn10扩散样品的矫顽力δ H-cj/wt%Tb（每wt%Tb使用的矫顽力增强值）分别提高了105%、63.4%和57.5%。显然，在多组分扩散源中使用Tb具有更高的矫顽力增强效率。定量分析结核分布特征，进行比较。Tb70Cu10Al10Zn10扩散源中Cu/Al/Zn元素的额外加入会进入富稀土（RE-rich）晶界相，形成易于扩散的通道，促进Tb元素的渗入。结果表明，富铽磁壳分布均匀性的改善、壳核结构的加深和局部晶界相的增加是多组分扩散磁体矫顽力显著增强的关键因素。另外，一方面，Tb与Cu/Al/Zn元素容易结合，有效地阻止了Tb进入主相；另一方面，由于Tb70Cu10Al10Zn10扩散磁体中Tb的均匀分布，使得Tb70Cu10Al10Zn10扩散磁体的壳核结构更薄。这两个因素共同导致剩余物增加。本研究提出，采用多组分合金作为扩散源，在提高烧结Nd-Fe-B磁体磁性能的同时，减少了Tb的消耗，提供了一种成分多样性和成本效益的方法。(C) 2022年由Elsevier B.V.出版
The effect of multicomponent Tb70-xPrxCu10Al10Zn10 (x = 0-30) film diffusion on microstructure and magnetic properties of sintered Nd-Fe-B magnets was investigated in this paper through magnetron sputtering system. The coercivity increased significantly from 11.5 kOe to 17.5 kOe, 18.8 kOe, 19.8 kOe, and 17.8 kOe for the processed samples by Tb40Pr30Cu10Al10Zn10, Tb60Pr10Cu10Al10Zn10, Tb(70)Cu10Al(10)Zn(10) and Tb, respectively. The remanence and the maximum magnetic energy product of multicomponent film diffused magnets were all higher than those of Tb diffused magnet. Particularly, compared with Tb diffused magnet, the Delta H-cj/wt%Tb (the coercivity enhancement per wt% Tb usage) of Tb40Pr30Cu10Al10Zn10, Tb60Pr10Cu10Al10Zn10 and Tb70Cu10Al10Zn10 diffused samples increased by 105%, 63.4% and 57.5%, respec-tively. It is obviously that the Tb utilization in multicomponent diffusion sources has a higher efficiency in coercivity enhancement. The quantitative analysis of Tb distribution was characterized for comparison. The extra addition of Cu/Al/Zn elements in Tb70Cu10Al10Zn10 diffusion source would enter into the rare earth-rich (RE-rich) grain boundary phases, and an easy diffusion channel was formed to promote the infiltration of Tb element. The results show that improved distribution uniformity of the Tb-rich shell, deeper shell-core structure and the increased local grain boundary phases are the key factors for the significant enhancement of coercivity in multicomponent diffusion magnet. In addition, on one hand, the easily combination of Tb and Cu/Al/Zn elements effectively prevented Tb from entering the main phases. On the other hand, the thinner shell-core structure was observed due to the uniform distribution of Tb in Tb70Cu10Al10Zn10 diffused magnet. These two factors jointly lead to the increase of remanence. This work puts forward that using multicomponent alloy as diffusion sources provides a composition diversity and cost-effective way to enhance the magnetic properties of sintered Nd-Fe-B magnets, while reducing the consumption of Tb. (C) 2022 Published by Elsevier B.V.