HD处理烧结磁体制备各向异性NdFeB磁粉  

Manufacture of Anisotropic NdFeB Powders Process from Sintered Magnets by HD

作　　者：强文江[1] 汤虹[1] 孙爱芝[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《北京科技大学学报》2004年第3期285-288,共4页Journal of University of Science and Technology Beijing

基　　金：教育部青年骨干教师资助

摘　　要：研究了通过吸氢破碎(HD)处理由烧结NdFeB磁体制取各向异性磁粉的方法.实验结果表明:HD处理温度是该处理过程中的关键参数,对于最终获得的各向异性磁粉的矫顽力具有显著的影响,同时HD处理温度的变化决定了烧结磁体破碎过程中的断裂方式.当HD处理温度为220℃时,磁体主要以沿晶断裂方式破碎,再经过950℃温度下的热处理,获得的各向异性磁粉的矫顽力达到490 kA/m.A manufacture method of anisotropic NdFeB magnet powders was investigated from sintered bulk magnets by hydrogen decrepitation (HD process): it is found that HD temperature plays a very important role affecting the coercivity of the obtained magnetic powders evidently. This temperature determines the fracture way of bulk magnets during HD process as well. In intergranular fracture way through properly controlled HD temperature, at 220°C for instance, anisotropic magnet powders with a coercivity up to 490 kA/m are obtained after a following annealing treatment at 950°C.

关 键 词：NdFeB烧结磁体 各向异性磁粉 HD方法 矫顽力 

分 类 号：TG132.272[一般工业技术—材料科学与工程] TM271.3[金属学及工艺—合金]