| Optimization of core-shell structure distribution in sintered Nd-Fe-B magnets by titanium addition |
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| 作者姓名： | Shuwei Zhong Munan Yang Sajjad Ur Rehman Sangen Luo Longgui Li Chao Li Jiajie Li Shuhua Xiong Ihor Bulyk Bin Yang |
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| 作者单位： | 1. Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology;2. Key Laboratory of Development and Application of Ionic Rare Earth Resources,Ministry of Education,Jiangxi University of Science and Technology;3. Ganjiang Innovation Academy,Chinese Academy of Sciences;5. Ganzhou Dongci Rare Earth Co.,Ltd.(DMEGC);6. Jiangxi Rare Earth Functional Materials Technology Co.,Ltd. |
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| 基金项目： | Project supported by the National Natural Science Foundation of China (51801085)； |
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| 摘 要： | In view of the uneven distribution of the core-shell structure of sintered Nd-Fe-B magnets after grain boundary diffusion,this study proposes to use high-melting-point and reactive element titanium(Ti) as an additive to increase the diffusion channels and to enhance the diffusion of heavy rare earth elements along the grain boundary phase.By adding Ti element,the diffusion depth and hence the intrinsic coercivity of magnets are increased significantly.The addition of Ti increases the coercivity ...
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| 收稿时间： | 29 January 2022 |
Optimization of core–shell structure distribution in sintered Nd-Fe-B magnets by titanium addition |
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| Shuwei Zhong,Munan Yang,Sajjad Ur Rehman,Sangen Luo,Longgui Li,Chao Li,Jiajie Li,Shuhua Xiong,Ihor Bulyk,Bin Yang.Optimization of core-shell structure distribution in sintered Nd-Fe-B magnets by titanium addition[J].Journal of Rare Earths,2023,41(7):1068-1072. |
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| Affiliation: | 1. Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, China;2. Key Laboratory of Development and Application of Ionic Rare Earth Resources, Ministry of Education, Jiangxi University of Science and Technology, Ganzhou 341000, China;3. Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China;4. National Rare Earth Function Materials Innovation Center, Ganzhou 341000, China;5. Ganzhou Dongci Rare Earth Co., Ltd. (DMEGC), Ganzhou 341000, China;6. Jiangxi Rare Earth Functional Materials Technology Co., Ltd., Ganzhou 341000, China;1. Faculty of Materials and Manufacturing, Key Laboratory of Advanced Functional Materials, Ministry of Education of China, Beijing University of Technology, Beijing 100124, China;2. Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;3. State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China;1. CAS Key Laboratory of Magnetic Materials and Devices, and Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Analytical Center, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;1. College of Rare Earths, Jiangxi University of Science and Technology, Ganzhou 341000, China;2. National Rare Earth Functional Materials Innovation Center, Ganzhou 341000, China;1. Jiangxi Key Laboratory for Rare Earth Magnetic Materials and Devices & College of Rare Earth, Jiangxi University of Science and Technology, Ganzhou 341000, China;2. Institute of Rare Earth Magnetic Material, Xiamen Tungsten Co., Ltd., Xiamen 361010, China;3. Fujian Key Laboratory for Rare Earth Functional Materials, Longyan 366300, China;4. Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China;1. Jiangxi Key Laboratory for Rare Earth Magnetic Materials and Devices & College of Rare Earths, Jiangxi University of Science and Technology, Ganzhou 341000, P.R. China;2. Institute of rare earth magnetic material, Xiamen Tungsten Co. Ltd. Xiamen 361010, P.R. China;3. Fujian Key Laboratory for Rare Earth Functional Materials, Longyan 366300, P.R. China;4. Ganjiang Innovation Academy, Chinese Academy of Science, Ganzhou 341000, P.R. China;5. National Rare Earth Function Materials Innovation Center, Ganzhou 314000, P.R. China |
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| Abstract: | In view of the uneven distribution of the core–shell structure of sintered Nd-Fe-B magnets after grain boundary diffusion, this study proposes to use high-melting-point and reactive element titanium (Ti) as an additive to increase the diffusion channels and to enhance the diffusion of heavy rare earth elements along the grain boundary phase. By adding Ti element, the diffusion depth and hence the intrinsic coercivity of magnets are increased significantly. The addition of Ti increases the coercivity at two stages: initially from 16.07 to 16.29 kOe by addition effect, and then from 16.29 to 25.16 kOe by facilitating the diffusion of Tb element. The formation of TiB2 phase improves the periodic arrangement of the crystal structure in the surroundings of the grain boundary phase and enhances its activity. The improved grain boundary diffusion and better core-shell structure distribution provide a theoretical guidance for solving the problem of diffusion depth in bulk magnets. |
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| Keywords: | Sintered Nd-Fe-B magnets Grain boundary diffusion Core–shell structure Rare earths |
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