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以 1K PAN基高强纤维为增强体 ,以调制中温煤沥青为基体前驱体 ,采用高压浸渍 -碳化工艺制备出了不同碳化压力状诚下的沥青基碳 /碳复合材料。通过对所得碳 /碳复合材料制件的弯曲性能试验及显微组织结构分析表明 ,材料的力学性能与碳化压力、密度、显微组织结构及界面结合状况有比较密切的联系。材料的断裂形式有韧性断裂、脆性断裂或它们的混合断裂形式 ,其密度和显微结构不同 ,表现出的断裂形式也不同。在制件的断面形貌上则表现为以纤维拔出为主或断面较为平整的脆断为主 (纤维和基体同时断裂 )
Using 1K PAN-based high-strength fiber as reinforcement, the medium-temperature coal tar pitch as matrix precursor was prepared by high pressure impregnation-carbonization process. The bending performance test and microstructure analysis of the obtained carbon / carbon composite parts show that the mechanical properties of the material are closely related to the carbonization pressure, density, microstructure and interfacial bonding. Fracture material fracture toughness, brittle fracture or mixed fracture of their forms, the density and microstructure of the different, showing the fracture form is also different. In the parts of the cross-section morphology is manifested as the main fiber pull out or the fracture is relatively flat brittle fracture-based (fiber and matrix fracture at the same time)