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HDDR各向異性NdFeB矯頑力機(jī)理的研究
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TM273

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國家“863”高技術(shù)資助項(xiàng)目(863-715-Z37-02)


Coercivity of HDDR-processed Anisotropic Nd_2Fe_(14)B-based Magnets
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    摘要:

    研究了HDDR各向異性NdFeB永磁材料的矯頑力機(jī)理。通過對(duì)材料磁化過程的研究以及對(duì)其顯微組織結(jié)構(gòu)的觀察分析，發(fā)現(xiàn)其矯頑力機(jī)制起源于疇壁掙脫主相Nd2Fe14B晶粒邊界以及晶粒團(tuán)邊界富釹相的釘扎機(jī)制，其中富釹相對(duì)材料疇壁的釘扎是決定其矯頑力的關(guān)鍵因素。通過理論計(jì)算，其結(jié)果與材料實(shí)際的矯頑力十分接近。此外，還進(jìn)行了驗(yàn)證性實(shí)驗(yàn)并提出了改善材料矯頑力的途徑。

    Abstract:

    The coercivity mechanism of HDDR anisotropic Nd Fe B magnet is investigated. The measurements of magnetization curve and different susceptibilities as well as the observations of microstructure are performed. It is concluded that the magnetic hardening of the magnet is due to the pinning of domain walls at grain boundaries and the Nd rich boundary phase that distributes homogeneously around some colonies composed of fine Nd2Fe14B grains. The coercive field is mainly determined by the pinning of domain walls by the Nd rich boundary phase. The conclusions mentioned above are in good agreement with the theoretical calculation of the intrinsic coercivity of the magnet. Furthermore, experimental verification is carried out and the processes for improving the coercivity of the magnets are proposed.

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岳明 劉旭波 肖耀福 張久興 周美玲 左鐵鏞. HDDR各向異性NdFeB矯頑力機(jī)理的研究[J].稀有金屬材料與工程,2003,(7):490~493.[Yue Ming, Liu Xubo, Xiao Yaofu, Zhang Jiuxing, Zhou Meiling, Zuo Tieyong. Coercivity of HDDR-processed Anisotropic Nd_2Fe_(14)B-based Magnets[J]. Rare Metal Materials and Engineering,2003,(7):490~493.]
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  • 最后修改日期:2002-07-15
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