metal materials; bonded magnet

作者:孙爱芝,李智伟,韩景智,李涛,张正义,肖耀福
关键词:metal materials; bonded magnet; compression molding; lubricant; strengthener; rare earths
单位:Department of Materials, magnetic materials
http://www.999magnet.com University of Science and Technology Beijing,FEW  DAEWOO (Yantai) Automobile Engine Co. Ltd.,Department of Materials, University of Science and Technology Beijing,Department of Materials, University of Science and Technology Beijing,Department of Materials, University of Science and Technology Beijing,Department of Materials, University of Science and Technology Beijing  Beijing 100083, China









, Yantai 264006, China









, Beijing 100083, China









, Beijing 100083, China









, Beijing 100083, China









, Beijing 100083, China;
摘要:The phenomenon of uneven density distribution is inevitable in the process of preparing bonded magnets with complicated shape or with large geometric size by compression molding due to the friction among magnetic powder grains and between magnetic powder and the die wall, which reduces the pressure along the compression direction. In order to improve the density distribution homogeneity, the thin  wall rings with composition of HDDR NdFeB prepared by compression molding were selected as the investigated object in this study. It was systematically investigated on the effect of addition level of lubricants and the addition methods of lubricants and strengthener on magnet density, density distribution and on magnet strength. By means of joint addition of lubricants and strengthener, which increases the magnet density and improves the magnet density distribution under the precondition of keeping the magnet strength unreduced. Thus the moldability of the bonded magnets is improved.