反应球磨与脱氢-再结合制备的Sm_2Fe_(17)N_x永磁粉  

Sm_2Fe_(17)N_x permanent magnetic powders prepared by reaction grinding and desorption-recombition

作　　者：包小涛[1] 刘颖[1] 李军[1] 郑青[1] 

机构地区：[1]四川大学材料科学与工程学院,四川成都610065

出　　处：《磁性材料及器件》2013年第3期1-3,7,共4页Journal of Magnetic Materials and Devices

基　　金：国家自然科学基金资助项目(51171122)

摘　　要：采用机械球磨的方法使氢化后的Sm-Fe合金实现歧化,再利用脱氢-再结合和氮化反应两步热处理制备出Sm2Fe17Nx永磁粉。研究了球磨时间对颗粒形貌、歧化产物、再结合产物和磁性能的影响。结果表明,球磨促使Sm-Fe合金发生歧化,到40h时基本歧化完全,获得细晶结构,球磨到60h时发生氢原子的解析导致再结合反应进行;球磨歧化可减小歧化产物的尺寸,缩短脱氢-再结合反应时间;制备出的各向同性粘结磁体矫顽力达到1438.6kA/m。Sm2FelTNx permanent magnetic powders have been prepared by mechanical grinding activated disproportionation from hydrogenated Sm-Fe alloy powders, and followed by a subsequent two-step heat treatment （desorption-recombination and nitriding process）. The effect of grinding time on particle morphology, disproportionation products, recombination products and magnetic property was investigated. The results showed that the disproportionation of Sm-Fe alloy was activated by mechanical grinding, and was substantially completed after grinding 40h when fine grain structure was obtained. Precipitation of hydrogen atoms when grinding for 60h result in recombination of Sm-Fe. Grinding activated disproportionation could reduce the size of the disproportionated powder and the time of desorption-recombination process. Isotropic bonded magnet with coercivity of up to 1438.6kA/m was prepared under proper process condition.

关 键 词：Sm2Fe17Nx永磁粉 机械球磨(MG) 氢化 岐化 脱氢 再结合(HDDR) 氮化 矫顽力 

分 类 号：TM273[一般工业技术—材料科学与工程]