Design and fabrication of Nd-Fe-B magnet with excellent thermal stability  

作　　者：Rui Han Shengzhi Dong Dong Li Dongmin Zhang Hongsheng Chen Jiyuan Xu George CHadjipanayis Zhuolin Li Ying Zhang Wei Li 

机构地区：[1]Division of Functional Materials Research,Central Iron and Steel Research Institute,Beijing,100081,China [2]Department of Physics and Astronomy Sharp Lab,University of Delaware,Newark,DE,19716,USA [3]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing,100190,China

出　　处：《Journal of Rare Earths》2024年第5期980-986,I0006,共8页稀土学报（英文版）

基　　金：Project supported by the National Key Research and Development Program(2021YFB3502801,2021YFB3502803);the National Natural Science Foundation of China(52001067)。

摘　　要：A novel Nd-Fe-B type permanent magnet with excellent thermal stability was designed by Co replacing Fe in the main phase and the grain boundary phase.The remanence and coercivity temperature coefficient reach 0.058%/℃and 0.465%/℃in the te mperature range from 25 to 100℃,which are much lower than those of commercial Nd-Fe-B magnet.An enhanced Curie temperature is obtained for the novel magnet due to the Co substitution,which significantly improves the operating temperature.The microstructure result reveals that an amorphous phase exists in the intergranular grains which is probably responsible for the deterioration of intrinsic coercivity.This work can provide a reference for the design and optimization of components of sintered Nd-Fe-B magnets with excellent thermal stability.

关 键 词：Thermal stability Remanence temperature coefficient Operating temperature Atomic substitution Rare earths 

分 类 号：TM2[一般工业技术—材料科学与工程]