Design and preparation of a sintered Nd-Y-Fe-B magnet with high magnetic properties via multi-main-phase process and subsequent grain boundary diffusion

IF 5.2 1区化学 Q1 CHEMISTRY, APPLIED Journal of Rare Earths Pub Date : 2025-02-01 DOI:10.1016/j.jre.2023.11.015

Fugang Chen , Suxin Lu , Jie Wang , Yong Zhao , Wenqiang Zhao , Zhi Xu

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Abstract

A sintered Nd-Y-Fe-B magnet was designed and manufactured by the multi-main-phase process. Unevenly distributed Y in the magnet decreases the adverse magnetic weakening effect of Y on the coercivity. Grain boundary diffusion process (GBDP) was conducted to further enhance the coercivity of the Nd-Y-Fe-B magnet. The coercivity increases significantly from 884 to 1741 kA/m after GBDP with Pr₆₀Tb₁₀Cu₃₀ alloy. The mechanism of the coercivity enhancement is discussed based on the microstructure analysis. Micromagnetic simulation reveals that when the diffused Tb-rich shell thickness is lower than 12 nm the c-plane shell (perpendicular to the c-axis) is much more effective in enhancing the coercivity than the side plane shell (parallel to the c-axis). But when the Tb-rich shell thickness is above 12 nm the side plane shell contributes more to the coercivity enhancement. The results in this work can help to design and manufacture Nd-Fe-B magnets with low cost and high magnetic properties.

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采用多主相法和晶界扩散法制备高磁性能Nd-Y-Fe-B烧结磁体

采用多主相法设计并制备了钕铁硼烧结磁体。磁体中不均匀分布的Y减小了Y对矫顽力的不利弱磁作用。通过晶界扩散过程(GBDP)进一步提高钕铁硼磁体的矫顽力。Pr60Tb10Cu30合金经GBDP后矫顽力由884 kA/m显著提高到1741 kA/m。在微观组织分析的基础上，探讨了矫顽力增强的机理。微磁模拟结果表明，当扩散富铽壳层厚度小于12 nm时，垂直于c轴的c面壳层比平行于c轴的侧面壳层对矫顽力的增强更有效。而当富铽壳层厚度大于12 nm时，侧面壳层对矫顽力的增强作用更大。研究结果有助于设计和制造低成本、高磁性能的钕铁硼磁体。

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来源期刊

Journal of Rare Earths 化学-应用化学

CiteScore

8.70

自引率

14.30%

发文量

374

审稿时长

1.7 months

期刊介绍： The Journal of Rare Earths reports studies on the 17 rare earth elements. It is a unique English-language learned journal that publishes works on various aspects of basic theory and applied science in the field of rare earths (RE). The journal accepts original high-quality original research papers and review articles with inventive content, and complete experimental data. It represents high academic standards and new progress in the RE field. Due to the advantage of abundant RE resources of China, the research on RE develops very actively, and papers on the latest progress in this field emerge every year. It is not only an important resource in which technicians publish and obtain their latest research results on RE, but also an important way of reflecting the updated progress in RE research field. The Journal of Rare Earths covers all research and application of RE rare earths including spectroscopy, luminescence and phosphors, rare earth catalysis, magnetism and magnetic materials, advanced rare earth materials, RE chemistry & hydrometallurgy, RE metallography & pyrometallurgy, RE new materials, RE solid state physics & solid state chemistry, rare earth applications, RE analysis & test, RE geology & ore dressing, etc.