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이 논문의 연구 히스토리 (8)
2011
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The thermal shock properties of SiC materials were investigated for high temperature applications. In particular, the effect of thermal shock temperature on the flexural strength of SiC materials was evaluated, in conjunction with a detailed analysis of their microstructures. The efficiency of a nondestructive technique using ultrasonic waves was also examined for the characterization of SiC materials suffering from a cyclic thermal shock history. SiC materials were fabricated by a liquid phase sintering process (LPS) associated with hot pressing, using a commercial submicron SiC powder. In the materials, a complex mixture of Al₂O₃ and Y₂O₃ powders was used as a sintering additive for the densification of the microstructure. Both the microstructure and mechanical properties of the sintered SiC materials were investigated using SEM XRD, and a three point bending test. The SiC materials had a high density of about 3.12 Mg/m3 and an excellent flexural strength of about 700 ㎫, accompanying the creation of a secondary phase in the microstructure. The SiC materials exhibited a rapid propagation of cracks with an increase in the thermal shock temperature. The flexural strength of the SiC materials was greatly decreased at thermal shock temperatures higher than 70 ℃, due to the creation of microcracks and their propagation. In addition, the SiC materials had a clear tendency for a variation in the attenuation coefficient in ultrasonic waves with an increase in thermal shock cycles.
목차
ABSTRACT
1. 서론
2. 실험방법
3. 실험결과 및 고찰
4. 결론
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참고문헌
참고문헌 (13)
참고문헌 신청
2. [학술지(정기간행물)] - 이상필 / 2008 / Al2O3와 Y2O3 입자를 함유한 액상소결 SiC 재료의 특성 / 한국해양공학회지 22 (4) : 59 ~ 64
3. [학술지(정기간행물)] - Dong, S. / 2003 / Processing Optimization and Mechanical Evaluation of Hot Pressed 2D Tyranno-SA/SiC Composites / Journal of the European Ceramic Society 23 : 1223 ~ 1231
4. [학술지(정기간행물)] - Hasegawa, A / 2000 / Critical Issue and Current Status of SiC/SiC Composite for Fusion / Journal of NuclearMaterials 283 : 128 ~ 137
5. [학술지(정기간행물)] - Hasselman, D.P.H / 1984 / Role of Mixed-Mode Crack Propagation in Thermally Shocked Bbrittle Materials / Theoretical and Applied Fracture Mechanics 2 : 59 ~ 65
6. [학술지(정기간행물)] - Jones, R.H / 2002 / Promise and Challenges of SiCf/SiC Composite for Fusion Energy Applications / Journal of Nuclear Materials 307 (311) : 1057 ~ 1072
3. [학술지(정기간행물)] - Dong, S. / 2003 / Processing Optimization and Mechanical Evaluation of Hot Pressed 2D Tyranno-SA/SiC Composites / Journal of the European Ceramic Society 23 : 1223 ~ 1231
4. [학술지(정기간행물)] - Hasegawa, A / 2000 / Critical Issue and Current Status of SiC/SiC Composite for Fusion / Journal of NuclearMaterials 283 : 128 ~ 137
5. [학술지(정기간행물)] - Hasselman, D.P.H / 1984 / Role of Mixed-Mode Crack Propagation in Thermally Shocked Bbrittle Materials / Theoretical and Applied Fracture Mechanics 2 : 59 ~ 65
6. [학술지(정기간행물)] - Jones, R.H / 2002 / Promise and Challenges of SiCf/SiC Composite for Fusion Energy Applications / Journal of Nuclear Materials 307 (311) : 1057 ~ 1072
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