Modified HDDR Process for Producing Anisotropic NdFeB Powders

Xubo Liu, Yue Ming, Yaofu Xiao, Qi Zeng, Zhengyi Zhang, Run Wang

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    Cite this article as:

    Xubo Liu, Yue Ming, Yaofu Xiao, Qi Zeng, Zhengyi Zhang, and Run Wang, Modified HDDR Process for Producing Anisotropic NdFeB Powders, J. Univ. Sci. Technol. Beijing , 8(2001), No. 2, pp.111-114.
    Xubo Liu, Yue Ming, Yaofu Xiao, Qi Zeng, Zhengyi Zhang, and Run Wang, Modified HDDR Process for Producing Anisotropic NdFeB Powders, J. Univ. Sci. Technol. Beijing , 8(2001), No. 2, pp.111-114.
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    Materials

    Modified HDDR Process for Producing Anisotropic NdFeB Powders

    基金项目: 

    supported by the National Advanced Material Committee of China(NAMCC, No.715-Z37-02)

      通信作者:
    The effect of HDDR (hydrogenation-decomposition-desorption-recombination process) treating conditions on magnetic anisotropy of Nd13FebalCo17B7Ga1Zr0.1 powders has been studied. It is found that increasing recombination temperature is effective for magnetic anisotropy formation, but at the cost of reducing the coercive force. The microstructure analysis (TEM) indicates that the NdFeB recombination nucleation takes place markedly during the transition range from decomposition stage to recombination stage, in which both temperature and H2 pressure change sharply. In order to create a more stable treatment condition for recombination nucleation, a modified HDDR process is established in which the conventional continuous transition range is divided into several stages. The experimental results have proved that such a process can effectively enhance the remanence of the magnet powders with high certainty, while only cause a little reduction in coercivity.

     

    Materials

    Modified HDDR Process for Producing Anisotropic NdFeB Powders

    Author Affilications
    • Funds: 

      supported by the National Advanced Material Committee of China(NAMCC, No.715-Z37-02)

    • Received: 19 August 2000;
    The effect of HDDR (hydrogenation-decomposition-desorption-recombination process) treating conditions on magnetic anisotropy of Nd13FebalCo17B7Ga1Zr0.1 powders has been studied. It is found that increasing recombination temperature is effective for magnetic anisotropy formation, but at the cost of reducing the coercive force. The microstructure analysis (TEM) indicates that the NdFeB recombination nucleation takes place markedly during the transition range from decomposition stage to recombination stage, in which both temperature and H2 pressure change sharply. In order to create a more stable treatment condition for recombination nucleation, a modified HDDR process is established in which the conventional continuous transition range is divided into several stages. The experimental results have proved that such a process can effectively enhance the remanence of the magnet powders with high certainty, while only cause a little reduction in coercivity.

     

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