通过对不同温度条件下,水氧腐蚀前后2D C/SiC复合材料热扩散性能的演变规律,研究了环境损伤对C/SiC复合材料热扩散性能的作用机制。在水蒸气和氧气混合环境下,C/SiC复合材料内部气孔率增加,同时在材料表面有氧化物形成。材料内部出现的气孔,阻断了热流在材料内部的传输,使得热扩散性能呈现出直线下降的趋势。氧化物的形成,在一定程度上封填裂纹,有助于热量的传输,能够在一定程度上改善材料热扩散性能。 The evolution mechanism of thermal diffusivity of 2D C / SiC composites before and after water and oxygen corrosion under different temperature conditions was studied. The mechanism of environmental damage on thermal diffusivity of C / SiC composites was studied. In the mixed environment of water vapor and oxygen, the internal porosity of C / SiC composites increases, while the formation of oxides on the surface of the material. The pores inside the material block the heat transfer inside the material and the thermal diffusivity tends to decrease linearly. Oxide formation, to a certain extent, sealing cracks, contribute to the heat transfer, to a certain extent, improve the thermal diffusion properties of materials.