基于改进的d-HDDR各向异性NdFeB合金矫顽力机理研究  

Study on the coercivity mechanism of anisotropic NdFeB magnet material based on improved d-HDDR

作　　者：梁超 张敏刚[1,3] 陈峰华 赵苗苗[1] 董永安 LIANG Chao;ZHANG Min-gang;CHEN Feng-hua;ZHAO Miao-miao;DONG Yong-an(College of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;Taiyuan Blooming Source Permanent Magnet Equipment Co,Ltd,Taiyuan 030003,China;Shanxi University of Electronic Science and Technology(preparation),Linfen 041000,China)

机构地区：[1]太原科技大学材料科学与工程学院,山西太原030024 [2]太原盛开源永磁设备有限公司,山西太原030003 [3]山西电子科技学院(筹),山西临汾041000

出　　处：《磁性材料及器件》2023年第2期11-16,共6页Journal of Magnetic Materials and Devices

基　　金：山西省重点研发计划项目(201903D121086);山西先进永磁材料与技术协同创新中心项目(2019-01)。

摘　　要：通过对磁粉磁化特性的研究、显微组织结构的观察分析以及矫顽力的理论计算,研究了改进的室温吸氢后“氢化-歧化-脱氢-再复合”(d-HDDR)各向异性Nd_(2)Fe_(14)B磁粉的矫顽力机理。结果表明,矫顽力来源于主相Nd_(2)Fe_(14)B晶粒或晶粒团的边界以及边界处富钕相对畴壁运动的钉扎,其中晶粒团边界处富钕相对畴壁的钉扎是矫顽力的决定性因素。此外,进行了验证性实验并得出了DR温度高于脱氢-再复合(HD)温度40℃时,磁粉的矫顽力较好,用回火热处理可以改善磁粉的矫顽力。The coercivity mechanism of the improved “hydrogenation disproportionation dehydrogenation recombination”(d-HDDR) anisotropic Nd-Fe-B magnetic powder after hydrogen absorption at room temperature was studied through the study of magnetic particle magnetization characteristics,observation and analysis of microstructure and theoretical calculation of coercivity.The results show that the coercivity mechanism comes from the boundary of the main phase Nd_(2)Fe_(14)B grain or grain cluster and the pinning of the neodymium rich relative domain wall at the boundary.The pinning of the neodymium rich relative domain wall at the grain cluster boundary is the decisive factor of the coercivity.In addition,confirmatory experiments are carried out,and it is concluded that the coercivity of magnetic powder is better when the hydrogenation disproportionation(DR) temperature is 40℃ higher than the dehydrogenation recombination(HD)temperature.It is proposed that the coercivity of magnetic powder can be improved by reheating heat treatment.

关 键 词：Nd_(2)Fe_(14)B 矫顽力 富Nd相 钉扎机制 d-HDDR 

分 类 号：TM273[一般工业技术—材料科学与工程]