添加低熔点Nd-Cu合金对纳米晶热压Nd-Fe-B磁体的影响  

The influence of Nd-Cu alloy addition on the magnetic properties of die-upset Nd-Fe-B nanocrystalline magnets

作　　者：杜效[1,2] 郭朝晖[1,2] 朱明刚[1,2] 韩瑞[1,2] 汪旭超[1,2] 靖征 李卫[1,2] 

机构地区：[1]钢铁研究总院功能材料研究所,北京100081 [2]先进金属磁性材料及制备技术北京市工程实验室,北京100081

出　　处：《功能材料》2015年第B12期64-67,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51331003);国家重点基础研究发展计划(973计划)资助项目(2014CB643701)

摘　　要：采用钕铁硼快淬磁粉和低熔点Nd-Cu合金混粉热压/热流变的方法,制备出的各向异性磁体矫顽力从747kA/m提高到1 280kA/m。XRD图谱表明样品取向度随合金添加量增大逐渐减小。通过SEM和TEM图片发现添加的Nd-Cu主要分散在晶界中,使得平均晶粒尺寸减小,各向异性热流变磁体晶界变厚,静磁耦合作用减弱,矫顽力得到明显提升。Theanisotropic magnets consists of Nd-Fe-B melt spun powder and low-melting Nd Cu powder were prepared by hot-pressed and die-upset process method. Compared to the magnet without Nd-Cu alloy, the coer- civity of magnet with Nd-Cu addition enhanced from 747 kA/m to 1 280 kA/m. The XRD patterns show that the orientation degree decreases with increasing the Nd-Cu addition. The SEM and TEM images show that a thicker grain boundary and smaller grain size are obtained for the magnet after Nd Cu grain boundary diffusion, and hence the static magnetic coupling effect between the grains is reduced, which increases the coercivity of the magnets.

关 键 词：热压/热流变 Nd-Cu 矫顽力 晶界 

分 类 号：TG425[金属学及工艺—焊接]