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- Dy 화합물 혼합에 의한 (Nd, Dy)-Fe-B 소결자석의 자기특성 변화
- 남궁석, 이민우, 조인식, 박영덕, 임태환, 이성래, 장태석
- Magnetic Properties of (Nd, Dy)-Fe-B Sintered Magnets Mixed with Dy Compounds
- S. NamKung, M.W. Lee, I.S. Cho, Y.D. Park, T.H. Lim, S.R. Lee, T.S. Jang
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Journal of Korean Powder Metallurgy Institute 2011;18(1):29-34
DOI: https://doi.org/10.4150/KPMI.2011.18.1.029
2선문대학교 대학원 재료금속공학과
3선문대학교 대학원 재료금속공학과
4선문대학교 대학원 재료금속공학과
5선문대학교 대학원 재료금속공학과
6고려대학교 신소재공학부
7선문대학교 대학원 재료금속공학과
1Department of Materials and Metallurgical Engineering, Graduate School, Sunmoon University
2Department of Materials and Metallurgical Engineering, Graduate School, Sunmoon University
3Department of Materials and Metallurgical Engineering, Graduate School, Sunmoon University
4Department of Materials and Metallurgical Engineering, Graduate School, Sunmoon University
5Department of Materials and Metallurgical Engineering, Graduate School, Sunmoon University
6Department of Materials Science and Engineering, Korea University
7Department of Materials and Metall
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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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