Effect of Cobalt on HDDR Anisotropic NdFeB  

作　　者：刘旭波 岳明 肖耀福 张正义 王润 

机构地区：[1]School of Material Science & Engineering, University of Science & Technology Beijing

出　　处：《Journal of Rare Earths》2002年第6期579-582,共4页稀土学报（英文版）

基　　金：theNationalAdvancedMaterialsCommitteeofChina ( 715 -Z37-0 2 )

摘　　要：The effect of cobalt on the magnetic properties and anisotropy of HDDR anisotropic NdFeB was studied. It is found that Co is helpful for preparing anisotropic NdFeB with high coercivity. The research on the initial microstructure for NdFeB alloy indicates that Co tends to enter the crystal lattice of Nd-rich phase and some of Co atoms also enter the crystal lattice of Nd 2Fe 14B. The dissolution of Co changes the stability of Nd-rich phase and Nd 2Fe 14B in H 2 atmosphere and affects the kinetics of HDDR phase transformation. As a result, the NdFeB powder exhibits a high coercive force and a strong anisotropy.The effect of cobalt on the magnetic properties and anisotropy of HDDR anisotropic NdFeB was studied. It is found that Co is helpful for preparing anisotropic NdFeB with high coercivity. The research on the initial microstructure for NdFeB alloy indicates that Co tends to enter the crystal lattice of Nd-rich phase and some of Co atoms also enter the crystal lattice of Nd 2Fe 14B. The dissolution of Co changes the stability of Nd-rich phase and Nd 2Fe 14B in H 2 atmosphere and affects the kinetics of HDDR phase transformation. As a result, the NdFeB powder exhibits a high coercive force and a strong anisotropy.

关 键 词：rare earths Co HDDR NdFeB ANISOTROPY 

分 类 号：TM27[一般工业技术—材料科学与工程]