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Thermodynamic Analysis of Intergranular Additives in Sintered Nd-Fe-B Magnet

  • Cui, X.G. (School of Mechanical Engineering, Jiangsu University) ;
  • Wang, X.H. (School of Mechanical Engineering, Jiangsu University) ;
  • Cui, C.Y. (School of Mechanical Engineering, Jiangsu University) ;
  • Yin, G.C. (School of Mechanical Engineering, Jiangsu University) ;
  • Xia, C.D. (School of Mechanical Engineering, Jiangsu University) ;
  • Cheng, X.N. (School of Materials Science and Engineering, Jiangsu University) ;
  • Xu, X.J. (School of Mechanical Engineering, Jiangsu University)
  • Received : 2016.11.27
  • Accepted : 2017.05.30
  • Published : 2017.06.30

Abstract

To get deeper insight into the effect of intergranular additives in sintered Nd-Fe-B magnet and consequently improve the properties better, the interaction between additives (oxide, nitride, and carbide) and Nd-rich phase in the temperature range of 298.15-1400 K was analyzed thermodynamically. It can be found that the oxide additives became less stable than nitrides and carbides. Except for calcium oxide, almost all oxides could react with Nd from Nd-rich phase. To be different from oxide additives, the mechanism of nitrides and carbides was defined with various elements, either reaction with Nd from Nd-rich phase or not. The two different mechanisms would show different effects on the microstructure and hence properties of magnet. The thermodynamic analysis had a better agreement with the experimental information.

Keywords

References

  1. J. Fidler and T. Schrefl, J. Appl. Phys. 79, 5029 (1996). https://doi.org/10.1063/1.361565
  2. A. S. Kim and F. E. Camp, IEEE Trans. Magn. 3, 3823 (1997).
  3. S. Pandian, V. Chandrasekaran, G. Markandeyulu, K. J. L. Iyer, and K. V. S. R. Rao, J. Appl. Phys. 92, 6082 (2002). https://doi.org/10.1063/1.1513879
  4. C. H. de Groot, K. H. J. Buschow, and F. R. de Boer, J. Appl. Phys. 83, 388 (1998). https://doi.org/10.1063/1.366734
  5. T. S. Zhao, Y. B. Kim, and W. Y. Jeung, IEEE Trans. Magn. 35, 3301 (1999). https://doi.org/10.1109/20.800505
  6. O. M. Ragg and I. R. Harris, J. Alloys Compd. 256, 252 (1997). https://doi.org/10.1016/S0925-8388(96)02962-3
  7. R. S. Mottram and A. J. Williams, J. Magn. Magn. Mater. 222, 305 (2000). https://doi.org/10.1016/S0304-8853(00)00567-9
  8. W. H. Cheng, W. Li, C. J. Li, and S. Z. Dong, J. Magn. Magn. Mater. 234, 274 (2001). https://doi.org/10.1016/S0304-8853(01)00387-0
  9. J. F. Hu, Y. L. Liu, M. L. Yin, Y. Z. Wang, B. P. Hu, and Z. X. Wang, J. Alloys Compd. 288, 226 (1999). https://doi.org/10.1016/S0925-8388(99)00095-X
  10. S. J. Heh, K. D. Lin, Y. M. Jein, F. D. King, and F. L. Lee, IEEE Trans. Magn. 26, 2637 (1990). https://doi.org/10.1109/20.104823
  11. S. K. Chen, T. S. Chin, S. J. Heh, and K. D. Lin, IEEE Trans. Magn. 26, 2634 (1990). https://doi.org/10.1109/20.104822
  12. A. R. Yan, Z. M. Chen, X. P. Song, and X. T. Wang, J. Alloys Compd. 239, 172 (1996). https://doi.org/10.1016/0925-8388(96)02237-2
  13. Z. M. Chen, A. R. Yan, and X. T. Wang, J. Magn. Magn. Mater. 162, 307 (1996). https://doi.org/10.1016/S0304-8853(96)00254-5
  14. W. J. Mo, L. T. Zhang, A. D. Shan, L. J. Cao, J. S. Wu, and M. Komuro, J. Alloys Compd. 461, 351 (2008). https://doi.org/10.1016/j.jallcom.2007.06.093
  15. W. J. Mo, L. T. Zhang, Q. Z. Liu, A. D. Shan, J. S. Wu, K. Matahiro, and L. P. Shen, J. Rare Earths 26, 268 (2008). https://doi.org/10.1016/S1002-0721(08)60079-4
  16. A. S. Kim, J. Appl. Phys. 64, 5571 (1988). https://doi.org/10.1063/1.342284
  17. I. Barin and G. Platzki, Thermochemical data of pure substances, VCH, Weinheim (1995).
  18. X. K. Sun, G. F. Zhou, Y. C. Chuang, R. Grössinger, and H. R. Kirchmayr, J. Magn. Magn. Mater. 96, 197 (1991). https://doi.org/10.1016/0304-8853(91)90628-N
  19. X. G. Cui, M. Yan, T. Y. Ma, W. Luo, and S. J. Tu, J. Magn. Magn. Mater. 321, 392 (2009). https://doi.org/10.1016/j.jmmm.2008.09.022
  20. S. Kobe Besenicar, J. Holc. G. Drafit, and B. Saje, IEEE Trans. Magn. 30, 693 (1994). https://doi.org/10.1109/20.312379
  21. W. J. Mo, L. T. Zhang, L. Chen, A. D. Shan, and J. S. Wu, J. Chin. Rare Earth Soc. 25, 588 (2007).
  22. G. X. Zhao, X. P. Song, Z. M. Chen, A. R. Yan, and X. T. Wang, Acta Metall. Sinica 32, 413 (1996).