Effect of Cobalt on HDDR Anisotropic NdFeB

稀土学报(英文版), 2002, 20(6): 579-582.

刘旭波 ^1, , 岳明 ^2, , 肖耀福 ^3, , 张正义 ^4, , 王润 ^5,

1.School of Material Science & Engineering, University of Science & Technology Beijing, Beijing 100083, China

2.School of Material Science & Engineering, University of Science & Technology Beijing, Beijing 100083, China

3.School of Material Science & Engineering, University of Science & Technology Beijing, Beijing 100083, China

4.School of Material Science & Engineering, University of Science & Technology Beijing, Beijing 100083, China

5.School of Material Science & Engineering, University of Science & Technology Beijing, Beijing 100083, China

基金项目: the National Advanced Materials Committee of China(715-Z37-02)

Effect of Cobalt on HDDR Anisotropic NdFeB

Keywords： rare earths

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 Nd2Fe14B. The dissolution of Co changes the stability of Nd-rich phase and Nd2Fe14B in H2 atmosphere and affects the kinetics of HDDR phase transformation. As a result, the NdFeB powder exhibits a high coercive force and a strong anisotropy.

参考文献

[1]	Gutfleisch O;Verdier M;Harris I R .Kinetics studies on solid-HDDR process in NdFeB-type alloys[J].Journal of Applied Physics,1994,76(10):6256.
[2]	Sun Aizhi;Xiao Yaofu;Qiu Baoqin et al.Microstructure and magnetic characteristics for HDDR Nd2(Fe Co)14B/Nd2(Fe Co)17 magnetic powder[J].Acta Metallurgica Sinica(in Chin),1996,32(08):827.
[3]	Takeshita T.;Morimoto K. .ANISOTROPIC ND-FE-B BONDED MAGNETS MADE FROM HDDR POWDERS[J].Journal of Applied Physics,1996(8 Pt.2a):5040-5044.
[4]	Nakamura H;Suefuji S;Sumimoto S et al.Effect of HDDR treatment conditions on magnetic properties of NdFeB anisotropy powders[J].Journal of Applied Physics,1994,76(10):6828.

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Effect of Cobalt on HDDR Anisotropic NdFeB

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