块体SmCo7/Nd2Fe14B异质纳米复合永磁体的微结构和磁性能
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TG146.4

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河北省重点研发计划项目(18211904D,19211008D);河北省高等学校科学技术研究项目(QN2019040);邯郸市科学技术研究与发展计划项目(19422111008-28)


Microstructure and Magnetic Properties of the Bulk Anisotropic Nanohybrid SmCo7/Nd2Fe14B Magnets
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    摘要:

    采用高压热压缩变形技术对高能球磨的SmCo基非晶-纳米晶粉体与商用的Nd-Fe-B纳米晶粉体的混合物冷压块进行变形处理,成功制备出块体各向异性SmCo7/Nd2Fe14B异质纳米复合永磁体。通过X射线衍射仪(XRD)、透射电子显微镜(TEM)以及振动样品磁强计(VSM)对块体SmCo7/Nd2Fe14B异质纳米复合永磁体的微结构和磁性能进行分析研究得出:所制备磁体的微结构由SmCo7/Nd2Fe14B纳米晶区域组成,且SmCo7/Nd2Fe14B纳米晶具有沿其(00l)方向(平行于压力方向)的择优取向;磁体具有明显的磁各向异性,室温下沿压力方向具有16 MGOe的最大磁能积;磁体具有较好的温度稳定性,其矫顽力温度系数β(RT-250℃)=-0.26%℃-1。研究结果表明,所制备磁体具有较高的潜力,可应用于国防军工、轨道交通等科技领域。

    Abstract:

    By using high-pressure thermal compression (HPTC), the blends of SmCo-based amorphous-nanocrystalline powders and the commercial Nd-Fe-B nanocrystalline powders were deformed, and the bulk anisotropic nanohybrid SmCo7/Nd2Fe14B magnets were successfully prepared. The microstructure and magnetic properties of the obtained magnets were studied by XRD, TEM and VSM. The experimental results show that the obtained SmCo7/Nd2Fe14B magnets are composed of SmCo7 and Nd2Fe14 nanocrystalline regions, and the SmCo7 and Nd2Fe14B nanocrystals possess a (00l)texture along the pressure direction (parallel to the pressure direction). Magnets exhibit an obvious magnetic anisotropy and a maximum energy product of 16 MGOe at room temperature (RT) along the pressure direction. Moreover, the obtained magnets have a good thermal stability with a low β(RT-250 ℃)=-0.26% ℃-1.These findings demonstrate that the bulk anisotropic nanohybrid SmCo7/Nd2Fe14B magnets have high potential to be applied in national defense, military industry, rail transit and other scientific and technological fields.

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黄光伟,王亚娜,宋文鹏,郑立允,贺洪江.块体SmCo7/Nd2Fe14B异质纳米复合永磁体的微结构和磁性能[J].河北工程大学自然版,2020,37(3):107-112

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  • 收稿日期:2020-06-02
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  • 在线发布日期: 2020-10-17
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