典型文献
Development of non-rare earth grain boundary modification techniques for Nd-Fe-B permanent magnets
文献摘要：
The magnetic performance of Nd-Fe-B magnets depends on their grain boundary structure.Intergranular addition and grain boundary diffusion(GBD)process are effective approaches for enhancing coercivity with low material cost.This review summarizes the development of grain boundary modification tech-niques with emphasis on our recent work using cost-effective non-rare earth(non-RE)sources for GBD.Up to now,heavy rare earth(HRE)based compounds,metals and light rare earth(LRE)based alloys have been successfully employed as the diffusion sources for coercivity enhancement.Inspired from the pre-vious investigations on the intergranular addition of non-RE compounds and alloys for Nd-Fe-B magnets,in 2015,we firstly proposed a novel GBD process based on diffusion source of MgO.After that,vari-ous non-RE diffusion sources have been developed.The fundamentals of non-RE additives and non-RE diffusion sources for hard magnetic properties enhancement of Nd-Fe-B magnets are summarized here based on both the experimental and computational results.In particular,the properties-microstructure relationships of non-RE GBD modified magnets are discussed.The non-RE alloys or compounds modify the composition and structure of the grain boundary by diffusing into the intergranular regions,result-ing in enhanced coercivity and corrosion resistance.Recently,we used Al-Cr coatings for both coercivity enhancement and surface protection,which shortens the production process and makes non-RE diffusion sources more competitive.The opportunity and future directions for non-RE GBD are also discussed in this review.
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作者姓名：
Zhongwu Liu;Jiayi He;Qing Zhou;Youlin Huang;Qingzheng Jiang
作者机构：
School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China;Guangdong Provincial Key Laboratory of Rare Earth Development and Application,Institute of Rare Met.,Guangdong Academy of Sciences,Guangzhou 510650,China;School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China;Jiangxi Key Laboratory for Rare Earth Magnetic Materials and Devices(IREMMD)/College of Rare Earths,Jiangxi University of Science and Technology,Ganzhou 341000,China
文献出处：
引用格式：
[1]Zhongwu Liu;Jiayi He;Qing Zhou;Youlin Huang;Qingzheng Jiang-.Development of non-rare earth grain boundary modification techniques for Nd-Fe-B permanent magnets)[J].材料科学技术（英文版）,2022(03):51-61
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0.464752
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