碳陶摩擦材料是继碳/碳材料之后的新一代制动材料，是现代交通运输工具和动力机械向高速高能载发展的重要保障，疲劳行为及热裂是制约碳陶制动盘可靠运行和寿命提高的关键科学问题。本项目基于相似理论，采用仿真模拟和台架试验相结合的方法，构建适合不同制动工况的热-机械耦合场数学模型，探讨碳陶制动盘的疲劳行为和损伤演变机理。以碳纤维整体毡为预制体，分别采用化学气相渗透法和熔融渗硅法制备碳和碳化硅基体获得碳陶摩擦材料。研究碳陶摩擦材料在单一热负荷下的性能和热循环下的热疲劳行为；探明缩比件和全尺寸碳陶制动盘在不同工况下的摩擦性能变化规律和摩擦机理；阐述摩擦界面行为及材料裂纹萌生和动态扩展的规律；揭示碳陶摩擦材料制动盘在热-机械复杂耦合环境下的疲劳行为和损伤演变机理；并提出控制裂纹扩展的方法及预防措施。在此基础上优化设计并获得最佳性能的全尺寸碳陶制动盘，为进一步实现碳陶制动盘的开发及应用奠定理论和方法基础。

Carbon fibre reinforced carbon and silicon carbide dual matrix composites (C/C-SiC) is a new generation of high performance brake materials after carbon/carbon composites. In comparison to the traditional brake materials, C/C–SiC brake composites exhibit low density, high thermal shock resistance, longer service life, especially lower sensibility to surroundings and temperature for a silicon carbide share of at least 20% in mass. With the modern transportation and power machinery become more speed and lower weight, The demand for reliability and safety of C/C-SiC become more and more urgent. But the fatigue behavior and thermal cracks are the key scientific problems that constrained the life and reliability of C/C-SiC. This project is based on the similarity theory, and with the methods of step simulation and successive approximation, combine with finite element analysis, non-destructive testing and bench testing, for investigating the damage evolving and failure mechanism of C/C-SiC brake composites based on the complicated thermo-mechanical coupling condition. The preform was prepared by needling method, and carbon matrix were prepared by chemical vapor infiltration, and finally made use of liquid silicon infiltration to prepare the silicon carbide and obtained the modified C/C-SiC composites. The properties base on only heat load and fatigue behavior of C/C-SiC under thermal cycling will be investigated, as well as the tribological properties and mechanism of subscale and full-size piece C/C-SiC brake discs at different brake conditions. The friction interface behavior and crack initiation and dynamic expansion will be proven. The theoretical model of composite crack initiation and dynamic expansion will be established, and failure mechanism and preventive measures will be obtained. The failure behavior and damage evolving mechanism of C/C-SiC based on the complicated thermo-mechanical coupling condition will be explored. We will optimal design and get a full-size C/C-SiC brake disc with optimum performance base on the above researches, which lay the theoretical and methodological basis for the further development and application of C/C-SiC brake discs.