Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Effect of Cu and DyF3 Powder Additions on the Coercivity of Sintered Nd-Fe-B Magnets

Cu와 DyF3 분말의 혼합이 Nd-Fe-B 소결자석의 보자력에 미치는 영향

  • NamKung, S. (Department of Materials and Metallurgical Engineering, Graduate School, Sunmoon University) ;
  • Lee, M.W. (Department of Materials and Metallurgical Engineering, Graduate School, Sunmoon University) ;
  • Dhakal, D.R. (Department of Materials and Metallurgical Engineering, Graduate School, Sunmoon University) ;
  • Lim, T.H. (Department of Materials and Metallurgical Engineering, Graduate School, Sunmoon University) ;
  • Kim, T.H. (Department of Materials Science and Engineering, Korea University) ;
  • Lee, S.R. (Department of Materials Science and Engineering, Korea University) ;
  • Jang, T.S. (Department of Materials and Metallurgical Engineering, Graduate School, Sunmoon University)
  • 남궁석 (선문대학교 대학원 재료금속공학과) ;
  • 이민우 (선문대학교 대학원 재료금속공학과) ;
  • ;
  • 임태환 (선문대학교 대학원 재료금속공학과) ;
  • 김태훈 (고려대학교 신소재공학과) ;
  • 이성래 (고려대학교 신소재공학과) ;
  • 장태석 (선문대학교 대학원 재료금속공학과)
  • Received : 2012.05.17
  • Accepted : 2012.07.03
  • Published : 2012.08.28
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Abstract

Effect of Cu and $DyF_3$ powder mixing with Cu-free (Nd, Dy)-Fe-B jet-milled powder on the magnetic properties of sintered magnets was investigated. The coercivity of a magnet prepared from the Cu-free (Nd, Dy)-Fe-B powder was about 10 kOe even though the alloy powder already contained some Dy (3.5 wt%). When small copper powder was blended, however, the coercivity of the magnet increased almost 100%, exhibiting about 20 kOe. On the contrary, the coercivity enhancement was moderate, about 4 kOe, when dysprosium content in the sintered magnet was simply increased to 4.9 wt% by the addition of small $DyF_3$3 powder.

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References

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