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借助偏光显微镜、扫描电镜、透射电镜以及力学性能测试研究了微观结构对中间相沥青基炭/炭复合材料力学性能的影响。结果表明:基体炭在偏光显微镜下呈现出光学各向异性,在SEM和TEM下呈片层条带状结构。基体炭与纤维之间的界面不连续,为“裂纹型”界面。材料受载破坏时裂纹通过改变扩展路径而延缓其扩展速度,在纤维一基体界面处以及基体炭层片之间引起滑移,在断口形貌上体现出断裂台阶适中且与纤维拔出交替进行,表现出韧性破坏的断裂特征,材料具有较高的力学性能,抗弯强度达到257MPa.
The effects of microstructure on the mechanical properties of mesophase pitch-based carbon / carbon composites were investigated by means of polarizing microscope, scanning electron microscopy, transmission electron microscopy and mechanical properties testing. The results show that the matrix carbon shows optical anisotropy under a polarizing microscope and has a lamellar strip structure under SEM and TEM. The interface between the matrix carbon and the fibers is discontinuous and is the “Crack Type” interface. When the material is damaged by loading, the crack retards its spreading speed by changing the propagation path, causing slip between the interface of the fiber and the matrix carbon layer. It shows that the fracture step is moderate and the fiber pull-out alternates , Showing fracture characteristics of ductile fracture, the material has high mechanical properties, flexural strength reached 257MPa.