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| Investigation on coercivity mechanism and influencing factors of Sm2Fe17Nx permanent magnetic material |
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Received:June 02, 2021
Revised:June 24, 2021
Accepted:June 25, 2021
Published Online:April 27, 2022
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| DOI： |
| KeyWord:Sm2Fe17Nx permanent magnetic material;Coercivity mechanism;Coercivity; Reduction- diffusion method. |
| Author | Institution |
| LI Qing-hua |
BGRIMM Magnetic Materials Technology FuyangCo,Ltd |
| LIU Dong |
BGRIMM Magnetic Materials Technology FuyangCo,Ltd |
| HU Guo-hui |
BGRIMM Magnetic Materials Technology FuyangCo,Ltd |
| JIA Li-ying |
BGRIMM Magnetic Materials Technology FuyangCo,Ltd |
| WANG Qian |
BGRIMM Magnetic Materials Technology FuyangCo,Ltd |
| LI Zhi-hong |
BGRIMM Magnetic Materials Technology FuyangCo,Ltd |
| LIU Rong-ming |
BGRIMM Magnetic Materials Technology FuyangCo,Ltd |
| LI Bing-shan |
BGRIMM Magnetic Materials Technology FuyangCo,Ltd |
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| Abstract: |
| Coercivity is an important magnetic parameter of Sm2Fe17Nx (1≤x≤6) permanent magnetic materials. The study of coercivity mechanism and its influencing factors is of great significance to the development of Sm2Fe17Nx magnetic materials. The coercivity mechanism of Sm2Fe17Nx permanent magnetic material was studied by using VSM to test magnetic characteristic curves of powder under different applied fields. It is found that with the increase of the magnetization field Happ, the coercivity Hcj and the magnetization M gradually increase. When Happ≥19 kOe, the coercivity Hcj and the magnetization M no longer increase. According to the characteristics of the curve of Hcj-Happ and the initial magnetization curve, it is considered that the coercivity of Sm2Fe17Nx magnetic material belongs to the mechanism of reverse magnetization domain nucleation. At the same time, the influence factors of coercivity in the process of preparing Sm2Fe17Nx permanent magnetic material by reduction-diffusion method are summarized and analyzed. Many studies have shown that by controlling reasonable reduction diffusion temperature, nitriding temperature and time, ball milling time, ball milling conditions and anti-oxidation, uniform particles close to the size of a single domain can be obtained, which is beneficial to reduce soft magnetic phase α-Fe, impurity phase and the damage of the particle surface layer, thereby improving the coercivity of the Sm2Fe17Nx powder. |
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