PIP-C/SiC复合材料高温环境结构演变研究

Due to the popular applications in the aeronautic, astronautic and military fields, carbon fiber reinforced silicon carbide (C/SiC) composites have been widely investigated. Due to the advantages of simple requests for equipments, near net shape for complex components, and so on, the precursor infiltration and pyrolysis (PIP) route has attracted much more attentions.The applications of C/SiC composites are high-temperature environment, so it is important to study the microstructures evolutions of PIP-C/SiC composites under high-temperature circumstances (>1500℃). Consequently, in order to offer technologies for applications of PIP-C/SiC composites, the work investigated the high-temperature evolutions of the compositions, microstructures and properties of PIP-C/SiC composites, by using high-temperature annealing and high-temperature oxidation tests. Especially, the evolutions of SiC matrix, C fiber and interphase are highly focused. Then the microstructures evolutions model of PIP-C/SiC composites are established, in order to better understand the damage mechanism of PIP-C/SiC composites. The work, which focus on the evolutions of SiC matrix, C fiber and interphase of PIP-C/SiC composites under high-temperature circumstances, is innovation. The outcome of the work will post the damage mechanism of PIP-C/SiC, and provide the theory of the design, preparation and application of anti-oxidation coatings for PIP-C/SiC composites.

由于C/SiC 复合材料在航空航天和军事领域的广泛应用，以及PIP 工艺在设备使用要求和复杂构件近净成型技术等方面表现出来的优势，PIP-C/SiC 复合材料越来越受到材料研究者的关注。C/SiC复合材料的主要应用背景是高温热环境领域，因此了解材料在高温环境（大于1500℃）下的结构性能演变规律成为研究PIP-C/SiC复合材料的一个重要任务。本项目以PIP-C/SiC复合材料为背景，采用高温热处理和高温氧化测试，研究PIP-C/SiC 复合材料组成结构演变，探索高温环境下复合材料基体和纤维的演变规律，在此基础上初步建立PIP-C/SiC 复合材料高温环境结构演变模型，更深入地理解PIP-C/SiC 复合材料的失效机理并对性能进行控制。项目成果有助于进一步理解高温环境下PIP-C/SiC复合材料的失效机理，为PIP-C/SiC复合材料涂层的设计、制备和应用提供理论依据。

由于C/SiC 复合材料在航空航天和军事领域的广泛应用，以及PIP 工艺在设备使用要求和复杂构件近净成型技术等方面表现出来的优势，PIP-C/SiC 复合材料越来越受到材料研究者的关注。C/SiC复合材料的主要应用背景是高温热环境领域，因此了解材料在高温环境（大于1500℃）下的结构性能演变规律成为研究PIP-C/SiC复合材料的一个重要任务。本项目以PIP-C/SiC复合材料为背景，采用高温热处理和高温氧化测试，1)系统研究了PIP-C/SiC复合材料的结构组成；分析了该复合材料体系的微观组成结构；2)研究了PIP-C/SiC复合材料高温热处理环境下组成结构演变，研究了SiC基体高温结构演变与碳纤维的高温结构演变；3)研究了PIP-C/SiC复合材料不同氧化温度下力学性能演变及结构演变研究；4)研究了SiC涂层PIP-C/SiC复合材料的高温力学性能与热震性能。项目的研究为PIP-C/SiC复合材料涂层的设计、制备和应用提供理论依据。