The diffusion behavior and striking coercivity enhancement by Dip-coating TbH3 powders in sintered NdFeB magnets
| Autor: | Qingfang Huang, Renhui Liu, Pengpeng Qu, Pan Weimao, Zhenchen Zhong, Mianfu Li, Toujun Zhou |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science 02 engineering and technology Coercivity engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Magnetocrystalline anisotropy 01 natural sciences Dip-coating Electronic Optical and Magnetic Materials Neodymium magnet Coating Magnet 0103 physical sciences engineering Grain boundary diffusion coefficient Diffusion (business) Composite material 0210 nano-technology |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 536:168091 |
| ISSN: | 0304-8853 |
| DOI: | 10.1016/j.jmmm.2021.168091 |
| Popis: | Grain boundary diffusion of Tb can improve the microstructural and magnetic properties of NdFeB magnets. In this paper, we investigated diffusion behavior and coercivity enhancement by dip-coating TbH3 powders in sintered NdFeB magnets. The results show that the coercivity increased rapidly from 14.02 kOe to 23.72 kOe after diffusion. Tb atoms diffused to the surface of the magnet and then into the interior, forming a network Tb-rich shell around (PrNd)2Fe14B grains. The higher magnetocrystalline anisotropy (PrNd,Tb)2Fe14B phases determine the coercivity enhancement. The Tb diffusion model was build up from coating layer to the magnet. This work may shed light on developing sintered NdFeB magnets with coercivity enhancement by diffusion technology. |
| Databáze: | OpenAIRE |
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