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中文摘要：
采用等温等压化学气相浸渗法（ICVI）制备了二维碳纤维增韧碳化硅碳二元基复合材料（2D Cf/（SiC-C））.利用扫描电镜（SEM）和背散射电子成像（BSE）研究了其基体的微观结构, 并与二维碳纤维增韧碳化硅陶瓷基复合材料（2D Cf/SiC）比较了室温力学性能和断口形貌.结果表明：2D Cf/（SiC-C）复合材料的基体是由SiC与热解碳（PyC）组成的多层结构, PyC基体层分布均匀而连续, 且与SiC基体层结合紧密.纤维束内部PyC基体层较厚的2D Cf/（SiC-C）复合材料具有较高的强韧性, 其拉伸强度、断裂应变、断裂韧性和断裂功分别比2D Cf/SiC复合材料的提高了3%、142%、22%和58%.SiC与PyC组成的多层基体使2D Cf/（SiC-C）复合材料的纤维在拔出过程中发生了两次集中拔出, 且第一次集中拔出的纤维对复合材料的强韧性起主要作用.
英文摘要：
Two dimensional carbon fiber-reinforced silicon carbide-carbon binary matrix composites （2D Cf/（SiC-C）） were fabricated by means of isothermal and isobaric chemical vapor infiltration （ICVI）. The matrix structures of the 2D Cf/（SiC-C） composites were characterized by the backscattered electron imaging （BSE） of scanning electron microscope （SEM）. Furthermore, their room temperature mechanical properties and fracture surfaces were compared with two dimensional carbon fiber-reinforced silicon carbide matrix composite （2D Cf/SiC）. The results indicate that the matrices in the 2D Cf/（SiC-C） composites are multilayered structures composed of SiC and PyC layers. The PyC matrix layers are homogeneous and continuous, which are bonding well with SiC matrix layers. The 2D Cf/（SiC-C） composite with a thicker PyC matrix layer in fiber bundles exhibits better mechanical properties. Meanwhile, its tensile strength, failure strain, fracture toughness and fracture work are 3%, 142%, 22% and 58% higher than those of the 2D Cf/SiC composite, respectively. The multilayered matrices composed of SiC and PyC layers, cause the fibers in the 2D Cf/（C-SiC） composites to pull out twice in a concentrated mode. Moreover, the first pull-out fibers play a leading role in enhancing the strength and toughness.
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