Research Progress of Sintered NdFeB Magnets Dopped With Dy
HU Sheng-qing1,2,CHEN Hong3，ZHOU Zhao-hui2
（1.Institute of Powder Metallurgy, Central South University, Changsha 410083, Hunan，China 2.Hunan Aerospace Magnetoelectric Co.， Ltd. , Changsha 410200, Hunan ，China 3. School of Materials Science and Engineering，Central South University of Forestry & Technology, Changsha 410004, Hunan ，China）
Abstract：Many research progress of sintered NdFeB magnets dopped with Dy were presented. The preparation method of magnets mainly includes traditional powder metallurgical process, binary alloy method and grain boundary diffusion process. Effects of Dy on the microstructure and magnetic properties of sintered NdFeB magnets were also showed . By dopped with Dy, the grain of magnets becomes smaller, and RE-rich shells are formed around the grain boundary of the Nd2Fe14B grains. As a result, the coercivity of sintered NdFeB magnets is significantly improved.
2014, Vol. 21 
