摘要
采用磁控溅射法在钕铁硼表面沉积一层金属Dy,高温扩散后,Dy扩散进入磁体内部,与磁体中Nd发生置换,形成均匀连续的富Nd相,并在主相晶粒表层区域形成(Nd,Dy)2Fe14B相,扩散深度约为350μm。其中,厚度为10 mm的无Dy磁体和低Dy含量磁体添加1%Dy(质量分数)后,经扩散处理,矫顽力分别提高了52.1%和32.2%。结果表明,经磁控溅射法渗镝,钕铁硼矫顽力显著提高,剩磁无明显降低。
Microstructual and magnetic properties of sintered Nd-Fe-B magnets improved by Dy magnetron sputtering have been investigated. XRD,GD-OES and SEM results show that after heat treatment,Dy element diffuse into the magnets and contribute to the formation of uniform and continuous Nd-rich phase and the outer region of Nd2 Fe14 B grains become(Nd,Dy)2 Fe14 B phase due to the substitution of Dy for Nd. Besides,the diffusion depth of Dy element exceed 350 μm. After grain boundary diffusion process,the coercivity of magnets without Dy element and mangnets with little Dy element increased by52. 1% and 32. 2%,respectively. In addition,after magnetron sputtering and grain boundary diffusion(GBD),the coercivity increased signigicantly and remanence decreased slightly.
出处
《稀土》
EI
CAS
CSCD
北大核心
2018年第1期90-97,共8页
Chinese Rare Earths
基金
浙江省自然基金项目(Q14E010014)
关键词
烧结钕铁硼
磁控溅射
晶界扩散
矫顽力
sintered Nd-Fe-B magnets
magnetron sputtering
grain boundary diffusion
coercivity
