DOI QR코드

DOI QR Code

Inward Diffusion of Tb Ions and the Magnetic Properties of the Nd-Fe-B Magnets

열처리 조건에 따른 Tb이온의 확산 및 Nd-Fe-B 자석의 자기적 특성

  • Oh, Seong-Uk (School of the Materials Science and Engineering, Kyungpook National University) ;
  • Kim, Dong-Whan (Stargroupind. Co.) ;
  • Gong, Gun-Seung (Stargroupind. Co.) ;
  • Heo, Young-Woo (School of the Materials Science and Engineering, Kyungpook National University) ;
  • Kim, Jeong-Joo (School of the Materials Science and Engineering, Kyungpook National University) ;
  • Lee, Joon-Hyung (School of the Materials Science and Engineering, Kyungpook National University)
  • Received : 2016.08.30
  • Accepted : 2016.11.04
  • Published : 2017.01.01

Abstract

In this study, the effect of Tb inward diffusion on the magnetic properties of the Nd-Fe-B sintered magnets was studied. After sintering of the magnets, $TbF_3$ slurries were dip-coated on the surface of the samples, then heat-treatment was followed for $TbF_3$ diffusion. The element distribution in the magnets and the diffusion profiles of Tb ions were analyzed by an EPMA (electron probe micro-analyzer). Prolonged heat treatment resulted in a deeper diffusion length of Tb ions. Coercivity of the $1^{st}$ heat-treated sample showed 21.86 kOe, while that of the $1^{st}$, $2^{nd}$ heat-treated and annealed sample revealed 34 kOe.

Acknowledgement

Supported by : Ministry of Trade, Industry & Energy (MOTIE, Korea)

References

  1. J. G. Lee, J. H. Yu, H. J. Kim, and T. S. Jang, J. Kor. Mag. Soc., 22, 58 (2012). [DOI: https://doi.org/10.4283/JKMS.2012.22.2.058] https://doi.org/10.4283/JKMS.2012.22.2.058
  2. B. M. Ma, IEEE Trans. Magn., 22, 916 (1986). [DOI: https://doi.org/10.1109/TMAG.1986.1064527] https://doi.org/10.1109/TMAG.1986.1064527
  3. S. Namkung, M. W. Lee, D. R. Dhakal, T. H. Lim, T. H. Kim, S. R. Lee, and T. S. Jang, J. Kor. Powd. Met. Inst., 19, 247 (2012). [DOI: https://doi.org/10.4150/KPMI.2012.19.4.247] https://doi.org/10.4150/KPMI.2012.19.4.247
  4. K. Hirota, H. Nakamura, T. Minowa, and M. Honshima, IEEE Trans. Magn., 42, 2909 (2006). [DOI: https://doi.org/10.1109/TMAG.2006.879906] https://doi.org/10.1109/TMAG.2006.879906
  5. M. Komuro, Y. Satsu, and H. Suzuki, IEEE Trans. Magn., 46, 3831 (2010). [DOI: https://doi.org/10.1109/TMAG.2010.2064780] https://doi.org/10.1109/TMAG.2010.2064780
  6. H. Nakamura, K. Hirota, M. Shimao, T. Minowam, and M. Honshima, IEEE Trans. Magn., 41, 3844 (2005). [DOI: https://doi.org/10.1109/TMAG.2005.854874] https://doi.org/10.1109/TMAG.2005.854874
  7. G. Yan, P. J. McGuiness, J.P.G. Farr, and I. R. Harris, J. Alloys Compd., 491, L20 (2010). [DOI: https://doi.org/10.1016/j.jallcom.2009.10.202] https://doi.org/10.1016/j.jallcom.2009.10.202
  8. M. Sagawa, S. Fujimura, H. Yamamoto, and Y. Matsuura, IEEE Trans. Magn., 20, 1584 (1984). [DOI: https://doi.org/10.1109/TMAG.1984.1063214] https://doi.org/10.1109/TMAG.1984.1063214
  9. F. Viala, F. Joly, E. Nevalainen, M. Sagawa, K. Hiraga, and K. T. Park, J. Magn. Magn. Mater., 242, 1329 (2002). [DOI: https://doi.org/10.1016/S0304-8853(01)00967-2]
  10. W. Mo, L. Zhang, Q. Liu, A. Shan, J. Wu, and M. Komuro, Scripta Materialia, 59, 179 (2008). [DOI: https://doi.org/10.1016/j.scriptamat.2008.03.004] https://doi.org/10.1016/j.scriptamat.2008.03.004
  11. W. F. Li, T. Ohkubo, and K. Hono, Acta Materialia, 57, 1337 (2009). [DOI: https://doi.org/10.1016/j.actamat.2008.11.019] https://doi.org/10.1016/j.actamat.2008.11.019