Rapid Preparation of Sm2Fe17N3 Fine Powder by Cryo-milling

Qiang Gao; Dong Liang; Hui-Dong Qian; Tao Zhu; Jingzhi Han; Changsheng Wang; Wenyun Yang; Jinbo Yang

ポスター Rapid Preparation of Sm2Fe17N3 Fine Powder by Cryo-milling

Qiang Gao (Institute of Condensed Matter and Material Physics, School of Physics, Peking University, China) ; Dong Liang (Institute of Condensed Matter and Material Physics, School of Physics, Peking University, China) ; Hui-Dong Qian (Institute of Condensed Matter and Material Physics, School of Physics, Peking University, China) ; Tao Zhu (Institute of Condensed Matter and Material Physics, School of Physics, Peking University, China) ; Jingzhi Han (Institute of Condensed Matter and Material Physics, School of Physics, Peking University, China) ; Changsheng Wang (Institute of Condensed Matter and Material Physics, School of Physics, Peking University, China) ; Wenyun Yang (Institute of Condensed Matter and Material Physics, School of Physics, Peking University, China) ; Jinbo Yang (Institute of Condensed Matter and Material Physics, School of Physics, Peking University, China)

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コレクション

The 28th International Workshop on Rare Earth and Future Permanent Magnets and Their Applications (REPM2025)

引用

Qiang Gao, Dong Liang, Hui-Dong Qian, Tao Zhu, Jingzhi Han, Changsheng Wang, Wenyun Yang, Jinbo Yang. Rapid Preparation of Sm2Fe17N3 Fine Powder by Cryo-milling. https://doi.org/10.48505/nims.5653

(BibTeX)

説明:

(abstract)

Samarium iron nitride (Sm2Fe17N3) permanent magnetic materials possess excellent intrinsic magnetic properties, including a saturation magnetization of 1.54 T [1]. To reach the full potential, the key is to increase the coercivity of the powder. Since the coercivity mechanism of Sm2Fe17N3 is nucleation-controlled, reducing the grain size through grinding is a necessary step in preparing highperformance powders for Sm2Fe17N3 magnets [2-4]. In this study, by using the equipment named Freezer/Mill, the Sm2Fe17N3 coarse powder was ground by cryo-milling method at liquid nitrogen temperature. After 1 minute of grinding, the coercivity of the Sm2Fe17N3 powder went up from 1.5 kOe to 7.0 kOe, while after 4 minutes, the coercivity reached 13.4 kOe. However, as the grinding time increased further, the coercivity began to decrease. X-ray diffraction (XRD) results indicated that no α-Fe phase was generated during the grinding process, and the Sm2Fe17N3 diffraction peaks broadened continuously with increasing grinding time, showing that the liquid nitrogen conditions inhibit oxidation and thermal decomposition during the milling process of Sm2Fe17N3, and as the grinding time increases, the grain size of the Sm2Fe17N3 powder continuously decreases. Meanwhile, scanning electron microscope (SEM) results showed that the sample ground for 4 minutes by cryo-milling had a similar particle size to that of the sample ground for 120 minutes by conventional ball milling. This indicates that the material becomes more brittle at low temperatures, making it easier to break. Compared to jet milling and ball milling methods, cryo-milling does not require the use of conventional solvents, is more efficient, and effectively avoids heat and oxidation issues during the grinding process. The cryo-milling method thus provides a promising approach to fabricate high-performance Sm2Fe17N3 powder.

References
[1] Coey, J. M. D., et al. (2019). Journal of Magnetism and Magnetic Materials 480: 186-192.
[2] Liang, D., et al. (2023). AIP Advances 13(2): 025104.
[3] Ye, L., et al. (2024). Journal of Materials Research and Technology 30: 451-460.
[4] Fang, Q., et al. (2016). Journal of Magnetism and Magnetic Materials 410: 116-122.

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