| Investigation on the Moldability of HDDR NdFeB Bonded Magnet Prepared by Compression Molding Method |
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| 作者姓名： | 孙爱芝 李智伟 韩景智 李涛 张正义 肖耀福 |
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| 作者单位： | [1]DepartmentofMaterials,UniversityofScienceandTechnologyBeijing,Beijing100083,China [2]FEW-DAEWOO（Yantai）AutomobileEngineCo.Ltd.,Yantai264006,China |
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| 基金项目： | ProjectsupportedbytheNationalAdvancedMaterialCommitteeofChina (2 0 0 1AA3 2 40 16)，BeijingMunicipalScience
&TechnologyCommission (H0 115 10 0 40 12 2 ) |
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| 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.
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| 关 键 词： | NdFeB HDDR 永磁材料 成型性 压制 粉末冶金 |
Investigation on the Moldability of HDDR NdFeB Bonded Magnet Prepared by Compression Molding Method |
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| Sun Aizhi ,Li Zhiwei ,Han Jingzhi ,Li Tao ,Zhang Zhengyi ,Xiao Yaofu.Investigation on the Moldability of HDDR NdFeB Bonded Magnet Prepared by Compression Molding Method[J].Journal of Rare Earths,2003,21(2):129-131. |
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| Authors: | Sun Aizhi Li Zhiwei Han Jingzhi Li Tao Zhang Zhengyi Xiao Yaofu |
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| Affiliation: | Sun Aizhi 1*,Li Zhiwei 2,Han Jingzhi 1,Li Tao 1,Zhang Zhengyi 1,Xiao Yaofu1 1 |
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| 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. |
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| Keywords: | metal materials bonded magnet compression molding lubricant strengthener rare earths |
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