Investigation on the Moldability of HDDR NdFeB Bonded Magnet Prepared by Compression Molding Method  

作　　者：孙爱芝 李智伟 韩景智 李涛 张正义 肖耀福 

机构地区：[1]Department of Materials, University of Science and Technology Beijing [2]FEW DAEWOO (Yantai) Automobile Engine Co. Ltd.

出　　处：《Journal of Rare Earths》2003年第2期129-131,共3页稀土学报（英文版）

基　　金：ProjectsupportedbytheNationalAdvancedMaterialCommitteeofChina (2 0 0 1AA3 2 40 16) ;BeijingMunicipalScience&TechnologyCommission (H0 115 10 0 40 12 2 )

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.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.

关 键 词：metal materials bonded magnet compression molding LUBRICANT strengthener rare earths 

分 类 号：TM273[一般工业技术—材料科学与工程] TF124.31[电气工程—电工理论与新技术]