Critical crack size of healing possibility of SiC ceramics

Effect of Crack Healing of SiC according to Times of SiO2Colloid Coating

“…The Effect of Hydrostatic Pressure Coating. All surface crack of SiC ceramic could heal in case of that is smaller than the crack width of 1.4 m and the crack length of 450 m [17]. In order to investigate the healing effect for larger crack width, this study applied hydrostatic pressure method as a way to penetrate the SiO 2 nanocolloid.…”

“…In particular, some results suggest that the cracks in silicon carbide, once healed, surprisingly become even stronger than the original silicon carbide. They conclude from the crack length that it was an important factor of crack healing by oxidation in silicon carbide [17]. Furthermore, there has been no clear explanation about the effect of SiO 2 colloid coating for crack.…”

A review of some of experimental and numerical studies of self‐crack‐healing in ceramics

“…They reported that a combination of SiC ceramics with SiO 2 as an additive had excellent healing ability. 86 Kunz and Klemm studied the crack-healing behavior of environmental barrier coating for nonoxide ceramic matrix composites and the healing mechanism. They reported an oxidation process as the healing mechanism, which was the transformation of the microstructure and the formation of SiO 2 and its reaction with ytterbium silicate.…”

“…The strength could be recovered after heat treatment of the specimens. They reported that a combination of SiC ceramics with SiO 2 as an additive had excellent healing ability 86 …”

Weibull Statistical Analysis on the Mechanical Properties of SiC by Immersion in Acidic and Alkaline Solutions

“…(6) 자기균열치유능력을 부여한 구조용 세 라믹스 연구는 비커스압입으로 도입된 균열을 열 처리로를 이용하여 치유하고 있으며, 치유된 세 라믹스는 모재보다 뛰어난 기계적특성을 가지고 있다. (7,8) 특히 탄화규소 세라믹스는 핵융합로의 블랭킷에 적용하기 위하여 검토되고 있으며, (9,10) 이러한 블랭킷에 흐르는 플라즈마는 부식성이 강 하여 금속재료로 적용할 수 없다. 이와 같이 내 식성 및 내화학성에 관한 세라믹스의 연구는 일 부 있으나, (11,12) 균열 치유재의 확률 해석에 관한 연구는 저자들이 연구를 수행하였다.…”