NdH纳米助剂回收制备烧结钕铁硼永磁体的研究  

Study on the recycling of the sintered Nd-Fe-B permanent magnets via NdH nano-particles doping

作　　者：李超[1] 刘卫强[1] 岳明[1] 张东涛[1] 张久兴[1] 

机构地区：[1]北京工业大学材料科学与工程学院,北京100124

出　　处：《功能材料》2014年第17期17059-17061,17065,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51001002;51371002);国家高技术研究发展计划(863计划)资助项目(2012AA063201)

摘　　要：采用NdH纳米掺杂的方法对废旧烧结钕铁硼磁体进行了回收制备。研究了不同NdH纳米粉掺杂量对再制造烧结钕铁硼磁性能的影响。随着NdH纳米粉末掺杂量的增多,烧结磁体矫顽力从926.54 kA/m增加到1 299.87 kA/m;剩磁首先相对稳定在1.296 T,在掺杂量>2.0%(质量分数)后,剩磁逐渐下降。与原始磁体相比,2.0%(质量分数)NdH纳米粉掺杂磁体性能最佳,矫顽力回复97.5%,剩磁回复95.9%,磁能积回复89.7%。通过计算,掺杂3.0%(质量分数)NdH纳米粉后,再制造烧结磁体中富钕相体积分数从3.03%增加到5.70%,然而其晶粒尺寸从8.18μm增长至11.68μm。结合微观分析与磁性能,2.0%(质量分数)NdH纳米粉掺杂磁体性能最好。Waste sintered Nd-Fe-B permanent magnets were recycled via NdH nano-particle doping method. Effect of the NdH nano-particle content on the microstructure and magnetic properties of the recycled magnets has been studied.As the NdH nano-particle content increases,the coercivity （H cj ）increases from 926.54 kA/m to 1 299.87 kA/m.The remanence （Br ）of about 1.296 T keeps unchanged and then decreases until additive exceeds 2.0wt%.Compared to the properties of the starting scrap sintered magnet,97.58%,95.9%,89.7% of H cj ,B r and （B H ）max have been recovered in the recycled magnets with 2.0wt% NdH nano-particles additive,respectively.Through calculation,the volume of Nd-rich phase increases as NdH nano-particle content increases, and reaches its maximum of 5.7vol% for 3.0vol% additive.However,grain size of the recycled magnets with 3.0wt% additive grow up to 1 1.68 μm from 8.18 μm.It was,therefore,concluded that 2.0wt% NdH nano-par-ticle additive was the best content for recovering the properties of the waste magnets.

关 键 词：回收再制造 烧结钕铁硼永磁体 NdH纳米颗粒 磁性能 

分 类 号：TM273[一般工业技术—材料科学与工程]