利用偏振光显微镜(PLM)和高分辨透射电镜(HRTEM)从微米到纳米尺度研究了改进等温化学气相沉积(ICVI)技术制备的C/C复合材料基体热解炭织构和精细结构特征. 结果表明: 纤维周围有3层不同织构的热解炭, 由纤维向外, 分别为光滑层、粗糙层和暗层. 基体与纤维之间以及不同织构基体间的界面结合较好, 高织构热解炭内有微裂纹存在, 并且裂纹在界面处终止扩展, 或以桥连的形式扩展. 不同织构热解炭在HRTEM下晶格条纹的近程和长程的择优取向度有明显区别.
The texture and nanostructure of C/C composites infiltrated by improved ICVI procesc was investigated by polarized light microscopy and high spatial resolution transmission electron microscope, respectively. Results show that there are three layers of pyrocarbon with different texture around the fiber. They are smooth laminar, rough laminar and dark laminar pyrocarbon from fiber to exterior, respectively. The interface bonding between the matrix and the fiber as well as that among different texture are well combined. The microcracks generate and propagate in rough laminar pyrocarbon. They do not straight extend through the interface into the lower texture, but propagate by bridged-link through the interface into the lower texture. The preferential orientation of the crystal lattice for the different texture pyrocarbon is quite different in short ranges and long ranges.
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