Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Coercivity Enhancement of Sintered Nd-Fe-B Magnets by Grain Boundary Diffusion with DyH3 Nanoparticles

  • Liu, W.Q. (College of Materials Science and Engineering, Beijing University of Technology) ;
  • Chang, C. (College of Materials Science and Engineering, Beijing University of Technology) ;
  • Yue, M. (College of Materials Science and Engineering, Beijing University of Technology) ;
  • Yang, J.S. (College of Materials Science and Engineering, Beijing University of Technology) ;
  • Zhang, D.T. (College of Materials Science and Engineering, Beijing University of Technology) ;
  • Liu, Y.Q. (College of Materials Science and Engineering, Beijing University of Technology) ;
  • Zhang, J.X. (College of Materials Science and Engineering, Beijing University of Technology) ;
  • Yi, X.F. (Anhui Earth-panda Advance Magnetic Material co., Ltd.) ;
  • Chen, J.W. (Anhui Earth-panda Advance Magnetic Material co., Ltd.)
  • Received : 2013.07.24
  • Accepted : 2013.09.27
  • Published : 2013.12.31
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Abstract

Grain boundary diffusion technique with $DyH_3$ nanoparticles was applied to fabricate Dy-less sintered Nd-Fe-B permanent magnets with high coercivity. The magnetic properties and microstructure of magnets were systematically studied. The coercivity and remanence of grain boundary diffusion magnet were improved by 60% and reduced by 7% compared with those of the original magnet, respectively. Meanwhile, both the remanence temperature coefficient (${\alpha}$) and the coercivity temperature coefficient (${\beta}$) of the magnets were improved after diffusion treatment. Investigation shows that Dy is preferentially enriched as (Nd, Dy)$_2Fe_{14}B$ phase in the surface region of the $Nd_2Fe_{14}B$ matrix grains indicated by the remarkable enhancement of the magneto-crystalline anisotropy field of the magnet. As a result, the magnet diffused with a small amount of Dy nanoparticles possesses enhanced coercivity without remarkably sacrificing its magnetization.

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References

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