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2017 Volume 26 Issue 5
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Rong-Xiang Shang, Jie-Fu Xiong, Dan Liu, Shu-Lan Zuo, Xin Zhao, Rui Li, Wen-Liang Zuo, Tong-Yun Zhao, Ren-Jie Chen, Ji-Rong Sun, Bao-Gen Shen. 2017: Influence of misch metal content on microstructure and magnetic properties of R-Fe-B magnets sintered by dual alloy method, Chinese Physics B, 26(5): 367-370. doi: 10.1088/1674-1056/26/5/057502
Citation: Rong-Xiang Shang, Jie-Fu Xiong, Dan Liu, Shu-Lan Zuo, Xin Zhao, Rui Li, Wen-Liang Zuo, Tong-Yun Zhao, Ren-Jie Chen, Ji-Rong Sun, Bao-Gen Shen. 2017: Influence of misch metal content on microstructure and magnetic properties of R-Fe-B magnets sintered by dual alloy method, Chinese Physics B, 26(5): 367-370. doi: 10.1088/1674-1056/26/5/057502
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Influence of misch metal content on microstructure and magnetic properties of R-Fe-B magnets sintered by dual alloy method

  • State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;University of Chinese Academy of Sciences, Beijing 100049, China

  • University of Chinese Academy of Sciences, Beijing 100049, China;Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China

  • Available Online: 30/12/2017
  • Fund Project: the National Key Research and Development Program of China(Grant .2014CB643702 and 2016YFB0700903)%the National Natural Science Foundation of China(Grant 51590880)%the Knowledge Innovation Project of the Chinese Academy of Sciences(Grant KJZD-EW-M05)
  • MM14Fe79.9B6.1/Nd13.sFes0.sB6 magnets were fabricated by dual alloy method (MM,misch metal).Some magnets have two Curie temperatures.Curie temperatures Tcl corresponds to the main phase which contains more LaCe,and Tc1 decreases from 276.5 ℃ to 256.6 ℃ with the content of MM increasing from 30.3 at.％ to 50.6 at.％.The variation of Br with the increase of MM indicates the existence of inter-grain exchange coupling in the magnets.When MM/R ≤ 30.3 at.％,the magnetic properties can reach the level of the intrinsic coercivity Hcj ≥ 7.11 kOe and the maximum energy product (BH)max ≥ 41 MGOe.Compared with Nd,La and Ce are easier to diffuse to the grain boundaries in the sintering process,and this will cause the decrease of Hcj.Due to the diffusion between the grains,the atomic ratio of La,Ce,Pr,and Nd in each grain is different and the percentage of Nd in all grains is higher than that in misch metal.
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Influence of misch metal content on microstructure and magnetic properties of R-Fe-B magnets sintered by dual alloy method

  • Available Online: 30/12/2017

Abstract: MM14Fe79.9B6.1/Nd13.sFes0.sB6 magnets were fabricated by dual alloy method (MM,misch metal).Some magnets have two Curie temperatures.Curie temperatures Tcl corresponds to the main phase which contains more LaCe,and Tc1 decreases from 276.5 ℃ to 256.6 ℃ with the content of MM increasing from 30.3 at.％ to 50.6 at.％.The variation of Br with the increase of MM indicates the existence of inter-grain exchange coupling in the magnets.When MM/R ≤ 30.3 at.％,the magnetic properties can reach the level of the intrinsic coercivity Hcj ≥ 7.11 kOe and the maximum energy product (BH)max ≥ 41 MGOe.Compared with Nd,La and Ce are easier to diffuse to the grain boundaries in the sintering process,and this will cause the decrease of Hcj.Due to the diffusion between the grains,the atomic ratio of La,Ce,Pr,and Nd in each grain is different and the percentage of Nd in all grains is higher than that in misch metal.

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