Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Magnetic Properties of (Nd, Dy)-Fe-B Sintered Magnets Mixed with Dy Compounds

Dy 화합물 혼합에 의한 (Nd, Dy)-Fe-B 소결자석의 자기특성 변화

  • 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) ;
  • Cho, I.S. (Department of Materials and Metallurgical Engineering, Graduate School, Sunmoon University) ;
  • Park, Y.D. (Department of Materials and Metallurgical Engineering, Graduate School, Sunmoon University) ;
  • Lim, T.H. (Department of Materials and Metallurgical Engineering, Graduate School, Sunmoon 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) ;
  • 조인식 (선문대학교 대학원 재료금속공학과) ;
  • 박영덕 (선문대학교 대학원 재료금속공학과) ;
  • 임태환 (선문대학교 대학원 재료금속공학과) ;
  • 이성래 (고려대학교 신소재공학부) ;
  • 장태석 (선문대학교 대학원 재료금속공학과)
  • Received : 2011.01.05
  • Accepted : 2011.01.31
  • Published : 2011.02.28
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Abstract

In order to increase the coercivity of (Nd, Dy)-Fe-B sintered magnets without much reduction of remanence, small amount of Dy compounds such as $Dy_2O_3$ and $DyF_3$ was mixed with (Nd, Dy)-Fe-B powder. After mixing, the coercivity of (Nd, Dy)-Fe-B sintered magnets apparently increased with the increase of Dy compound in the mixture. Addition of $DyF_3$ was more effective than $Dy_2O_3$ for the improvement of coercivity. Reduction of the remanence by the addition of Dy compound, however, was larger than expected mostly due to unresolved coarse Dy compound in the magnet. EPMA analysis revealed that Dy was diffused throughout the grains in the magnet mixed with $DyF_3$ whereas Dy was rather concentrated around grain boundaries in the magnet mixed with $Dy_2O_3$.

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References

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