摘要
以Nd31.5FebalB6.0Co1.2Cu0.04(质量分数,%)为母合金,添加不同含量DyHx粉研究Dy对Nd-Fe-B磁体性能和微观结构的影响。研究发现,Dy未扩散到主相晶粒中,主要分布在晶界相中;Dy使磁体晶粒得到细化、均匀化,异常长大晶粒基本消失,晶粒边界结构得到改善;添加0.5%(质量分数)的DyHx粉可以明显提高磁体矫顽力Hcj,但添加量超过1.0%(质量分数),磁体矫顽力Hcj增幅变小,磁体密度严重下降。
The effect of Dy on the properties and microstructures of sintered Nd-Fe-B with addition of various amounts of DyHx powder to Nd31.5FebalB6.0Co1.2Cu0.04（wt%）,as a precursor alloy,has been investigated. It is found that Dy is only located in the intergranular phases,and there is no diffusion of Dy into the matrix phases;It makes the grain more refined and uniform,and can effectively restrain the abnormal grain growth. Meanwhile,the microstructure of grain boundary has been improved;In addition,intrinsic coercivity Hcj is obviously increased with 0.5wt% DyHx addition. However,it is not easily improved and the density of magnets drastically decreases when the amounts of DyHx addition are more than 1.0wt%.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2010年第1期35-38,共4页
Journal of Functional Materials
基金
国家高技术研究发展计划(863计划)资助项目(2007AA03Z116
2007AA03Z438)
国家自然科学基金资助项目(50871032
50571035)
关键词
晶粒尺寸
矫顽力
晶界相
形核场
grain size coercivity intergranular phase nucleation field
