Grain Growth Behavior in Sintered Nd-Fe-B Magnets

作     者：刘湘涟 周寿增 

作者机构：School of Mechanical EngineeringNingbo University of Technology State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology Beijing 

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

年 卷 期：2007年第25卷第3期

页      面：329-335页

核心收录：

学科分类：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] 

基　　金：Project supported by China National Development Plan for Key Fundamental Research(973)(G2000-67201-3) 

主　　题：Nd-Fe-B magnet sintering grain growth powder size rare earths 

摘      要：The Nd2Fe14B grain growth behavior in sintered Nd-Fe-B magnets was quantitatively *** effects of sintering temperature and time,and alloy powder size and its distribution on grain growth process were ***,possible grain growth mechanisms in these magnets were qualitatively *** Nd2Fe14B grain growth proceeded at quite a high rate in the initial 0~1 h of sintering and from then onwards the grain growth rate decreased.A large average particle size or a wide particle size distribution of initial alloy powders was found to remarkably accelerate the grain growth process and even result in the occurrence of abnormal grain *** the basis of experimental results,two grain growth mechanisms were considered to operate during sintering of Nd-Fe-B magnets,that is,dissolution and re-precipitation of Nd2Fe14B particles,and Nd2Fe14B particle growth by *** was believed that Nd2Fe14B particle growth by coalescence not only produced a large average grain size and a wide grain size distribution,but also was the fundamental reason for the formation of abnormally large grains in the microstructure of sintered Nd-Fe-B magnets.