Convergent 열처리를 통한 Nd23Dy10Fe64TM2B1 소결자석의 보자력 향상
Coercivity Enhancement of Nd23Dy10Fe64TM2B1 Sintered Magnet by Convergent Heat Treatment
1
조회
0
다운로드
1
인용
0
참고문헌
키워드
초록
In this study, a convergent heat treatment was performed in certain temperature regions in order to control the microstructures of Nd-rich phases and to reduce thermal stress on grain boundaries which could be caused during expansion and shrinkage of Nd-rich and Nd2Fe14B phases. The difference of thermal expansion coefficient between Nd2Fe14B and Nd-rich phases is the mechanism for convergent heat treatment. The Nd-rich phases which were located in junctions could penetrate into the grain boundaries between Nd2Fe14B phases due to the difference of thermal expansion coefficient. Through the convergent heat treatment, the microcracks that were observed in cyclic heat treatment were not observed and coercivity was increased to 34.05 kOe at 8 cycles.
Abstract
In this study, a convergent heat treatment was performed in certain temperature regions in order to control the microstructures of Nd-rich phases and to reduce thermal stress on grain boundaries which could be caused during expansion and shrinkage of Nd-rich and Nd2Fe14B phases. The difference of thermal expansion coefficient between Nd2Fe14B and Nd-rich phases is the mechanism for convergent heat treatment. The Nd-rich phases which were located in junctions could penetrate into the grain boundaries between Nd2Fe14B phases due to the difference of thermal expansion coefficient. Through the convergent heat treatment, the microcracks that were observed in cyclic heat treatment were not observed and coercivity was increased to 34.05 kOe at 8 cycles.
참고문헌 (12)
- M. Sagawa, , J. Appl. Phys, 55, pp.2083~ (1984)
- D. Brown, , J. Magn. Magn.Mater, 248, pp.432~ (2002)
- D. Lemarchand, , IEEE Trans.Magn, 26, pp.2649~ (1990)
- H. Kromuller, , J. Magn.Magn. Mater, 69, pp.149~
- Y. Tsubokawa, , J. Appl. Phys, 63, pp.3319~ (1988)
- R. K. Mishira, , J. Appl.Phys, 59, pp.2244~ (1986)
- F. Vial, , J. Magn. Magn. Mater, 242, pp.1329~ (2002)
- R. Ramensh, , J. Appl.Phys, 70, pp.6453~ (1991)
- 주수증, "초강력 영구 자성체" (1999), 울산대학교 출판부
- 김세훈, "반복 열처리한 Nd-Fe-B 소결 자석의 미세구조 제어 및 자성특성 평가", 한국분말야금학회지, 15(6), pp.471~476 (2008), 한국분말야금학회
- 김동환, "완전이방화에 의한 초고특성 Nd계희토류영구자석 개발에 관한 연구" (2007), 지식경제부
- W. F. Li, , Acta Mater, 57, pp.1337~1346 (2009)