SiC/SiC 복합재료 기지재의 균열 폭에 따른 균열치유 특성

다국어 초록 (Multilingual Abstract)

SiC/SiC composites are among the most promising structural materials for fusion because of their potential application for high performance reactors and superior safety characteristics compared to metallic materials. And a recently developed SiC fiber, Tyranno-SA, was also used as the reinforcement in several SiC/SiC composites. In this study, we examined the relationship between various crack size and bending strength in order to analyze the mechanical properties under the room temperature. The mechanical properties and fracture behaviors were investigated using three-point bending test. we observed an aspect of crack-healing regarding both SiC/SiC composite ceramics and SiC monolithic ceramics as the matrix using a scanning electron microscope. And it was showed that crack healing effect by SiO₂ nano colloidal coating on SiC/SiC composite ceramics was not confirmed clearly. Therefore, we examined the crack-healing effect depending on the size of surface crack on SiC matrix, focusing on the strength recovery of the SiC ceramis as the matrix of SiC/SiC composite ceramics. As the result, It was found that the crack-healing behavior occurred effectively within a width of 1.4 ㎛, regardless of the crack length. And we improved the crack-healing effect, appling to the Hydrostatic Pressure Infiltration in SiO₂ nano colloidal coating method, repeatedly.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 재료 및 실험방법
• 3. 결과 및 고찰
• 4. 결론
• 참고문헌