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- 반복 열처리한 Nd-Fe-B 소결 자석의 미세구조 제어 및 자성특성 평가
- 김세훈, 김훈섭, 김동환, 김영도
- Microstructure Control and Magnetic Property of Nd-Fe-B Sintered Magnets After Cyclic Heat Treatment
- Se-Hoon Kim, Hoon-Sup Kim, Dong-Hwan Kim, Young-Do Kim
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Journal of Korean Powder Metallurgy Institute 2008;15(6):471-476
DOI: https://doi.org/10.4150/KPMI.2008.15.6.471
2한양대학교 신소재공학과
3한국기계연구원부설 재료연구소
4한양대학교 신소재공학과
1Division of Materials Science and Engineering, Hanyang University
2Division of Materials Science and Engineering, Hanyang University
3Korea Institute of Materials Science
4Division of Materials Science and Engineering, Hanyang University
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Abstract
Sintered Nd-Fe-B magnets have been widely used due to their excellent magnetic properties, especially for driving motors of hybrid and electric vehicles. The microstructure of Nd-Fe-B magnets strongly affects their magnetic properties, in particular the coercivity. Therefore, a post-sintering process like heat-treatment is required for improving the magnetic properties of Nd-Fe-B sintered magnets. In this study, cyclic heat treatment was performed at temperatures between 350°C and 450°C up to 16 cycles in order to control microstructures such as size and shape of the Nd-rich phase without grain growth of the Nd_2Fe_14B phase. The 2 cycles specimen at this temperature range showed more homogeneous microstructure which leads to higher coercivity of 35 kOe than as-sintered one.
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