中文摘要：

借助偏光显微镜、扫描电镜、透射电镜对具有热解炭过渡层的中间相沥青基炭/炭复合材料的微观结构进行了研究。结果表明：材料的基体由热解炭和中间相沥青炭组成,在偏光显微镜下均呈现出光学各向异性。材料内部形成了多层次的界面结构,热解炭与纤维的界面连续,界面层内的石墨微晶择优取向度较高,晶格条纹排列规整;中间相沥青炭与热解炭界面不连续,为＂裂纹型＂界面,界面层内主要为非晶态碳。材料中炭纤维、热解炭、中间相沥青炭的石墨微晶大小逐渐增大,择优取向度逐渐增高,晶格条纹的排列逐渐规整。片层条带状结构的中间相沥青炭以及材料内的微裂纹平行于炭纤维轴向。

英文摘要：

The microstructure of 2D PAN carbon fiberreinforced mesophase pitchbased matrix carbon/carbon（C/C） composites having a pyrocarbon transition layer was studied by polarized light microscopy （PLM）, scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. PLM results indicate that the matrix consisted of pyrocarbon and mesophase pitch carbon, whose structure is anisotropic. TEM and SEM results show that multilayer interfaces are formed inside the composite. The carbon fiberpyrocarbon interface is generally continuous, with a high degree of perfection and graphitic crystallites oriented parallel to the interface. The interface between the mesophase pitch carbon and the pyrocarbon is amorphous and is microfissured. The size and the degree of orientation of the graphitic crystallites gradually increase and the alignment of lattice fringes is gradually ordered from carbon fibers, to pyrocarbon to mesophase pitch carbon. The mesophase pitch matrix is lamellar carbon oriented parallel to the fiber axis. Numerous microcracks parallel to the carbon fiber axis are formed within the partially bonded interface and the matrix.