【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。更多还原

【Abstract】 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 coercivity of magnet with Nd-Cu addition enhanced from 747kA/m to 1 280kA/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.更多还原