Coercivity,microstructure,and thermal stability of sintered Nd-Fe-B magnets by grain boundary diffusion with TbH3 nanoparticles  

作　　者：Wei-Qiang Liu Cheng Chang Ming Yue Jing-Shan Yang Dong-Tao Zhang Jiu-Xing Zhang Yan-Qin Liu 

机构地区：[1]College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China

出　　处：《Rare Metals》2017年第9期718-722,共5页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51001002 and 51371002);the National High Technology Research and Development Program of China(No.2012AA063201);the Key Program of Science and Technology Development Project of Beijing Municipal Education Commission(No.KZ201110005007);Jinghua Talents of Beijing University of Technology;Rixin Talents of Beijing University of Technology;the Importation and Development of High-Caliber Talents Project of Beijing Municipal Institutions

摘　　要：Grain boundary diffusion technique with TbH3 nanoparticles was applied to fabricate Tb-less sintered NdFe-B permanent magnets with high coercivity. The magnetic properties and microstructure of magnets were systematically studied. The coercivity and remanence of grain boundary diffusion magnet are improved by 112% and reduced by 26% compared with those of the original magnet, respectively. Meanwhile, both the remanence temperature coefficient（α） and the coercivity temperature coefficient（β） of the magnets are improved after diffusion treatment. Microstructure shows that Tb element enriches in the surface region of Nd2Fe（14）B grains and is expected to exist as（Nd,Tb）2Fe（14）B phase. Thus, the magneto-crystalline anisotropy field of the magnet improves remarkably. As a result, the sintered Nd-FeB magnets by grain boundary diffusion with TbH3 nanoparticles exhibit enhanced coercivity.Grain boundary diffusion technique with TbH3 nanoparticles was applied to fabricate Tb-less sintered NdFe-B permanent magnets with high coercivity. The magnetic properties and microstructure of magnets were systematically studied. The coercivity and remanence of grain boundary diffusion magnet are improved by 112% and reduced by 26% compared with those of the original magnet, respectively. Meanwhile, both the remanence temperature coefficient（α） and the coercivity temperature coefficient（β） of the magnets are improved after diffusion treatment. Microstructure shows that Tb element enriches in the surface region of Nd2Fe（14）B grains and is expected to exist as（Nd,Tb）2Fe（14）B phase. Thus, the magneto-crystalline anisotropy field of the magnet improves remarkably. As a result, the sintered Nd-FeB magnets by grain boundary diffusion with TbH3 nanoparticles exhibit enhanced coercivity.

关 键 词：Grain boundary diffusion TbH3 nanoparticles COERCIVITY Thermal stability 

分 类 号：TM273[一般工业技术—材料科学与工程] TQ174.65[电气工程—电工理论与新技术]