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- HD 처리 및 열처리공정 개선에 의한 (Nd, Dy)-Fe-B 소결자석의 자기특성 향상
- 남궁석, 이연호, 김문갑, 장태석
- Improvement of the Magnetic Properties of (Nd, Dy)-Fe-B Sintered Magnets by Modification of HD and Annealing Processes
- S. NamKung, Y.H. Lee, M.K. Kim, T.S. Jang
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Journal of Korean Powder Metallurgy Institute 2010;17(5):359-364
DOI: https://doi.org/10.4150/KPMI.2010.17.5.359
1선문대학교 대학원 재료금속공학과
2선문대학교 대학원 재료금속공학과
3선문대학교 대학원 재료금속공학과
4선문대학교 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
2선문대학교 대학원 재료금속공학과
3선문대학교 대학원 재료금속공학과
4선문대학교 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
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Abstract
In an attempt to optimize the magnetic properties of (Nd, Dy)-Fe-B sintered magnets, hydrogenation and post-sintering heat treatment processes were investigated at various hydrogenation temperatures and heat treatment temperatures. The coercivity of (Nd, Dy)-Fe-B sintered magnets hydrogenated at 400°C increased to about 1.2 kOe without any detrimental effect on the remanence. Moreover, the coercivity of the magnets was enhanced further by a consecutive 2nd and 3rd step heat treatment. These results eventually leaded to the reduction of the Dy content in a high coercive (> 30 kOe) (Nd, Dy)-Fe-B sintered magnets, as much as 10%.
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