Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Improvement of Microstructural Anisotropy of Nd-Fe-B-Ga-Nb Alloy by the Control of Hydrogen Reaction

수소반응속도 제어에 의한 Nd-Fe-B-Ga-Nb 합금의 미세조직 이방화율 향상에 관한 연구

  • Lee, S.H. (Korea Institute of Materials Science) ;
  • Kim, D.H. (Korea Institute of Materials Science) ;
  • Yu, J.H. (Korea Institute of Materials Science) ;
  • Lee, D.W. (Korea Institute of Materials Science) ;
  • Kim, B.K. (Korea Institute of Materials Science)
  • 이상협 (한국기계연구원 부설 재료연구소) ;
  • 김동환 (한국기계연구원 부설 재료연구소) ;
  • 유지훈 (한국기계연구원 부설 재료연구소) ;
  • 이동원 (한국기계연구원 부설 재료연구소) ;
  • 김병기 (한국기계연구원 부설 재료연구소)
  • Published : 2010.02.28
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Abstract

HDDR treated anisotropic Nd-Fe-B powders have been widely used for the sheet motors and the sunroof motors of hybrid or electric vehicles, due to their excellent magnetic properties. Microstructural alignment of HDDR treated powders are mostly depending on the hydrogen reaction in disproportionation step, so the specific method to control hydrogenation reaction is required for improving magnetic properties. In disproportionation step, hydrogenation pressure and reaction time were controlled in the range of 0.15~1.0 atm for 15~180 min in order to control the micorstructural alignment of $Nd_2Fe_{14}B$ phase and, at the same time, to improve remanence of HDDR treated magnet powders. In this study, we could obtain a well aligned anisotropic Nd-Fe-B-Ga-Nb alloy powder having high remanence of 12 kG by reducing hydrogen pressure down to 0.3 atm in disproportionation step.

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References

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