Investigation on the Moldability of HDDR NdFeB Bonded Magnet Prepared by Compression Molding Method
来源期刊：JOURNAL OF RARE EARTHS2003年第2期
论文作者：张正义 韩景智 李涛 肖耀福 李智伟 孙爱芝
Key words：metal materials; bonded magnet; compression molding; lubricant; strengthener; rare earths;
Abstract: 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.
张正义1，韩景智1，李涛1，肖耀福1，李智伟2，孙爱芝1
(1.Department of Materials, University of Science and Technology Beijing, Beijing 100083, China;
2.FEW-DAEWOO Yantai Automobile Engine Co. Ltd., Yantai 264006, China)
Abstract: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.
Key words:metal materials; bonded magnet; compression molding; lubricant; strengthener; rare earths;
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