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<p>High-performance anisotropic hydrogenation–disproportionation–desorption–recombination (HDDR) NdFe(B, C) magnetic powder was prepared through two distinct synthesis routes: microwave plasma technique and grinding method. Using hydrogen-decrepitated (HD) NdFeB powder as a precursor material, we systematically investigated the effects of plasma treatment duration (0.5-2.5&#xa0;h) and graphite additive ratios on phase compositions, microstructural evolution, and magnetic performance. When the weight ratio of HD magnetic powder to graphite powder is 60:1, the grinding method NdFe(B, C) attains the optimal comprehensive performance, with B<sub>r</sub> = 3.23&#xa0;kGs, H<sub>cj</sub> = 5.88&#xa0;kOe, (BH)<sub>max</sub> = 5.18&#xa0;MGOe, and DOA = 0.58. Comparatively, the microwave plasma technique demonstrated superior compositional homogeneity and enhanced magnetic characteristics, with the best performance attained at treatment 1.5&#xa0;h, B<sub>r</sub> = 3.38&#xa0;kGs ( + 4.6%), H<sub>cj</sub> = 6.18&#xa0;kOe ( + 5.1%), (BH)<sub>max</sub> = 5.38&#xa0;MGOe ( + 3.9%), while maintaining DOA = 0.58. It provides new insights for the research of high anisotropy HDDR magnetic powder.</p>

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Microwave Plasma Technique and Grinding Method to Prepare NdFe(B, C) HDDR Anisotropic Powder

  • 期刊论文

  • 发表日期：

    2025年12月3日

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  • Lianqing Yu,
  • Junwei Cao,
  • Ke Liu,
  • Nannan Chen,
  • Haifeng Zhu,
  • Yaping Zhang

摘要

High-performance anisotropic hydrogenation–disproportionation–desorption–recombination (HDDR) NdFe(B, C) magnetic powder was prepared through two distinct synthesis routes: microwave plasma technique and grinding method. Using hydrogen-decrepitated (HD) NdFeB powder as a precursor material, we systematically investigated the effects of plasma treatment duration (0.5-2.5 h) and graphite additive ratios on phase compositions, microstructural evolution, and magnetic performance. When the weight ratio of HD magnetic powder to graphite powder is 60:1, the grinding method NdFe(B, C) attains the optimal comprehensive performance, with Br = 3.23 kGs, Hcj = 5.88 kOe, (BH)max = 5.18 MGOe, and DOA = 0.58. Comparatively, the microwave plasma technique demonstrated superior compositional homogeneity and enhanced magnetic characteristics, with the best performance attained at treatment 1.5 h, Br = 3.38 kGs ( + 4.6%), Hcj = 6.18 kOe ( + 5.1%), (BH)max = 5.38 MGOe ( + 3.9%), while maintaining DOA = 0.58. It provides new insights for the research of high anisotropy HDDR magnetic powder.