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 resistance.In this study,the magnetic prop-erties,anticorrosion properties,and microstructure of Nd-Fe-B sintered magnets with the intergranular addition of low-melting-point eutectic Tb68Ni32 alloy powders were investigated.The aim is to deter-mine if the addition of Tb68Ni32 can improve these properties.A low melting-point eutectic alloy Tb68Ni32 powders was prepared as a grain boundary additive and blended with the master alloy powders prior to sintering.The coercivity of the resultant magnets gradually increases from 1468 to 2151 kA/m by adding increasing amounts of Tb68Ni32.At the same time,the remanence first increases and then slightly decreases.After studying the micro structure and elemental composition of the Tb68Ni32 added magnets,it is found that the significant increase in coercivity and the negligible reduction in remanence is due to densification,improved grain orientation,a uniform and continuous boundary phase distribution,as well as the generation of a(Nd,Pr,Tb)2Fe14B"core-shell"structure surrounding the main-phase grain.Moreover,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 inter-granular phase.

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

Guangxi Key Laboratory of Information Materials,School of Materials Science and Engineering,Guilin University of Electronic Technology,Guilin 541004,China;China Rare Metals and Rare Earth(Guangxi)Jinyuan New Materials Co.,Ltd.,Hezhou 542603,China

稀土学报（英文版）

[1]Jia Li;Qingrong Yao;Weichao Huang;Jue Xie;Zhilin Mo;Jianqiu Deng;Jiang Wang;Guanghui Rao;Huaiying Zhou-.Improvement in magnetic properties,corrosion resistance and microstructure of Nd-Fe-B sintered magnets through intergranular addition of Tb68Ni32)[J].稀土学报（英文版）,2022(05):784-791

Tb68Ni32

Improvement,magnetic,properties,resistance,microstructure,Nd,sintered,magnets,through,intergranular,addition,New,energy,vehicles,offshore,wind,power,industries,have,high,demand,intrinsic,coercivity,In,this,anticorrosion,low,melting,point,eutectic,alloy,powders,were,investigated,aim,deter,mine,these,was,prepared,grain,boundary,additive,blended,master,prior,sintering,resultant,gradually,increases,from,kA,by,adding,increasing,amounts,At,same,remanence,first,then,slightly,decreases,After,studying,elemental,composition,added,found,that,significant,negligible,reduction,due,densification,improved,orientation,uniform,continuous,phase,distribution,well,generation,Pr,2Fe14B,core,shell,surrounding,main,Moreover,greatly,owing,enhancement,electrochemical,stability,optimization,morphology

0.478226