A fundamental study for the crack healing of SiC ceramics and SiCf/SiC composite ceramics
1
조회
0
다운로드
8
인용
0
참고문헌
키워드
초록
After sintering SiCf/SiC composite ceramics as a material applied to the blanket structure of a fusion reactor, micro-cracks are created by conducting a Vickers test. The presence of a crack was observed using a SEM and the relation between the bending strength and the orientation of the reinforcing fibers were analyzed. There is no relation between the bending strength of SiCf/SiC composite ceramics and the size of a pre-crack until a limited crack size. The crack healing behavior was investigated on SiCf/SiC composite ceramics with a coating of SiO2 nano-colloid on the surface using various methods, such as dipping and a hydrostatic pressure. Although the coating treatment with SiO2 nano-colloid is conducted according to the hydrostatic pressure method, SiO2 oxide is only created at the base of a crack. As a result, the recovery of bending strength cannot be anticipated.
Abstract
After sintering SiCf/SiC composite ceramics as a material applied to the blanket structure of a fusion reactor, micro-cracks are created by conducting a Vickers test. The presence of a crack was observed using a SEM and the relation between the bending strength and the orientation of the reinforcing fibers were analyzed. There is no relation between the bending strength of SiCf/SiC composite ceramics and the size of a pre-crack until a limited crack size. The crack healing behavior was investigated on SiCf/SiC composite ceramics with a coating of SiO2 nano-colloid on the surface using various methods, such as dipping and a hydrostatic pressure. Although the coating treatment with SiO2 nano-colloid is conducted according to the hydrostatic pressure method, SiO2 oxide is only created at the base of a crack. As a result, the recovery of bending strength cannot be anticipated.
참고문헌 (6)
- C.B. Charles, , J. Nucl. Mater, 283, pp.1~9 (2000)
- Y. Katoh, , J. Nucl. Mater, 329, pp.587~591 (2004)
- S.K. Lee, , J. Eur. Ceram. Soc, 25, pp.569~576 (2005)
- Y. Katoh, , Fusion Eng. Des, 61, pp.723~731 (2002)
- A. Hasegawa, , J. Nucl. Mater, 283, pp.128~137 (2000)
- K. W. Nam, , Int. J. Modern Phys B, 24, pp.2869~2874 (2010)