摘要
利用透射电镜(TEM)观察了湿氧气氛热处理对3D C/SiC复合材料纤维束中微裂纹扩展的影响规律。研究表明,在未经热处理的3D C/SiC纤维束中,微裂纹传播主要为沿纤维/界面相脱粘的单一模式;热处理后纤维束中的微裂纹形成了多种扩展模式。在经历了长达100h的保温之后,热解碳的部分有序化及其层状结构的形成是导致裂纹能量耗散模式增加的主要因素,有序结构的形成也增加了裂纹的联通和长裂纹形成的几率。
The law of crack propagation in fiber bundle of three-dimensional C/SiC composite before and after annealing in wet oxygen was investigated by TEM observation.The results show that the microcrack in fiber bundle of the untreated C / SiC always propagates in a single way while that of the annealed C / SiC possesses more paths.After annealing for 100 h,the texture of the pyrolytic carbon（PyC） becomes more ordered.The formation of the layered-domains in PyC is identified to take an important role in enriching the crack propagation modes,but also contributes to increase the probability of the formation of long cracks.
出处
《热加工工艺》
CSCD
北大核心
2011年第10期109-112,共4页
Hot Working Technology
基金
国家自然科学基金资助项目(51072169
51002120)
