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- 모합금의 균질화처리가 HDDR 처리된 Nd-Fe-Ga-Nb-B 합금의 자기적 특성에 미치는 영향
- 유지훈, 이상협, 김동환, 이동원, 김병기, 최문희, 김양도
- Effect of Homogenization Treatment on Magnetic Properties of HDDR Treated Nd-Fe-Ga-Nb-B Alloy
- J.H. Yu, S.H. Lee, D.H. Kim, D.W. Lee, B.K. Kim, M.H. Choi, Y.D. Kim
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Journal of Korean Powder Metallurgy Institute 2009;16(4):285-290
DOI: https://doi.org/10.4150/KPMI.2009.16.4.285
2한국기계연구원 부설 재료연구소
3한국기계연구원 부설 재료연구소
4한국기계연구원 부설 재료연구소
5한국기계연구원 부설 재료연구소
6부산대학교 재료공학과
7부산대학교 재료공학과
1Korea Institute of Materials Science
2Korea Institute of Materials Science
3Korea Institute of Materials Science
4Korea Institute of Materials Science
5Korea Institute of Materials Science
6Pusan National University
7Pusan National University
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Abstract
HDDR treated anisotropic Nd-Fe-B powders have been widely used, due to their excellent magnetic properties, especially for sheet motors and sunroof motors of hybrid and electric vehicles. Final microstructure and coercivity of such Nd-Fe-B powders depend on the state of starting mother alloys, so additional homogenization treatment is required for improving magnetic properties of them. In this study, a homogenization treatment was performed at 900sim1140°C in order to control the grain size and Nd-rich phase distribution, and at the same time to improve coercivity of the HDDR treated magnetic powders. FE-SEM was used for observing grain size of the HDDR treated powder and EPMA was employed to observe distribution of Nd-rich phase. Magnetic properties were analyzed with a vibrating sample magnetometer.
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