Improvement in magnetic properties,corrosion resistance and microstructure of Nd-Fe-B sintered magnets through intergranular addition of Tb_(68)Ni_(32)

作     者：Jia Li Qingrong Yao Weichao Huang Jue Xie Zhilin Mo Jianqiu Deng Jiang Wang Guanghui Rao Huaiying Zhou Jia Li;Qingrong Yao;Weichao Huang;Jue Xie;Zhilin Mo;Jianqiu Deng;Jiang Wang;Guanghui Rao;Huaiying Zhou

作者机构：Guangxi Key Laboratory of Information MaterialsSchool of Materials Science and EngineeringGuilin University of Electronic TechnologyGuilin 541004China China Rare Metals and Rare Earth(Guangxi)Jinyuan New Materials Co.Ltd.Hezhou 542603China 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2022年第40卷第5期

页      面：784-791,I0004页

核心收录：

学科分类：0820[工学-石油与天然气工程] 080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0702[理学-物理学] 

基　　金：Project supported by the Science and Technology Major Project of Guangxi Province(AA18242023-1) the National Key R&D Program of China(2016YFB0700901) the National Natural Science Foundation of China(51761007) the Natural Science Foundation of Guangxi Province(2017AD23031,AD17292001) 

主　　题：Nd-Fe-B sintered Magnets Tb_(68)Ni_(32)alloy Magnetic properties Corrosion resistance Microstructure Rare earths 

摘      要：New energy vehicles and offshore wind power industries have a high demand for sintered Nd-Fe-B magnets with high intrinsic coercivity and high corrosion *** this study,the magnetic properties,anticorrosion properties,and micro structure of Nd-Fe-B sintered magnets with the intergranular addition of low-melting-point eutectic Tb_(68)Ni_(32) alloy powders were *** aim is to determine if the addition of Tb_(68)Ni_(32) can improve these properties.A low melting-point eutectic alloy Tb_(68)Ni_(32) powders was prepared as a grain boundary additive and blended with the master alloy powders prior to *** coercivity of the resultant magnets gradually increases from 1468 to 2151 kA/m by adding increasing amounts of Tb_(68)Ni_(32).At the same time,the remanence first increases and then slightly *** studying the microstructure and elemental composition of the Tb_(68)Ni_(32) added magnets,it is found that the significant increase in coercivity and the negligible reduction in remanence is due to densificatio n,improved grain orientation,a unifo rm and continuous boundary phase distribution,as well as the generation of a(Nd,Pr,Tb)_(2) Fe_(14)B core-shell structure surrounding the main-phase ***,the corrosion resistance of the magnet is greatly improved owing to the enhancement of electrochemical stability,as well as the optimization of the distribution and morphology of the intergranular phase.