用模压成型方法制备HDDR粘结NdFeB磁体的成型性研究

在形状复杂或大尺寸的模压成型粘结磁体制备过程中，由于粉末颗粒间以及磁粉与模壁间的摩擦，造成沿压制方向的压制压力递减，使得磁体密度的不均匀分布的现象，成为不可避免，为了改善磁体密度分布不均匀的现象，本研究选取用HDDR NdFeB磁粉模压成型制备的薄壁环作为研究对象，系统地研究了润滑剂的添加量以及润滑剂和增强剂的添加方式对磁体密度、密度分布的均匀性以及磁体抗压强度的影响，通过复合添加润滑剂和增强剂的方法，可以保证在磁体抗压强度不降低的前提下，提高磁体的密度，改善密度分布的均匀性，从而改善粘结磁体的成型性。

The Investigation on Compressibility of HDDR NdFeB Bonded Magnet Produced by Molding Compression

Uneven density distribution is inevitable in the process of producing bonded magnets with complicated shape or with large geometric size by molding compression due to the friction among magnetic powder grains and between magnetic powder and die wall, which reduce the pressure along the compression direction. In order to improve the uneven density distribution. The thin-wall rings with the composition of HDDR NdFeB material produced by molding compression were selected as the investigated object. The effects of the amount of lubricants, the adding method of lubricants and strength compound on the magnet density, density distribution and on magnet strength were investigated. By means of complex adding lubricants and strength compound, which increases the magnet density and improves the magnet density distribution without reduction of magent strength, the compressibility of bonded magnets is improved.