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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双基体炭/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光学各向异性,材料内部形成多层次的界面结构,热解炭呈现“皱褶状”片层结构,中间相沥青炭呈现片层条带状结构,基体炭片层的走向基本上平行于纤维轴向。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-基体界面处以及基体炭片层之间引起滑移,在断口形貌上体现出锯齿状的断裂形式,材料具有韧性断裂的特征,抗弯强度最高可达223MPa。
The effects of microstructure on the mechanical properties of the dual-matrix carbon / carbon composites were investigated by means of polarizing microscope, scanning electron microscopy, transmission electron microscopy and mechanical testing. The results show that the matrix carbon exhibits optical anisotropy under a polarizing microscope and a multi-layered interfacial structure is formed inside the material. The pyrolytic carbon exhibits a lamellar structure of “corrugated” shape and the mesophase pitch carbon exhibits lamellar banded structure , The direction of the base carbon layer is substantially parallel to the fiber axis. When the material is damaged by loading, the crack slows down its propagation speed by changing the propagation path, causing slip between the fiber-matrix interface and the matrix carbon layer, showing a serrated fracture form on the fracture surface. The material has ductile fracture The characteristics of flexural strength up to 223MPa.