Based on the turbine high-temperature combustion gas simulation test platform, the long-term combustion gas environment exposure test of the 2D plain woven SiC_f/BN/SiC composites under two combustion conditions was carried out. Uniaxial tensile test, fracture morphology characterization and non-destructive testing analysis revealed the degradation and microstructure evolution of composites after exposure to combustion gas environment. The results show that the degradation of 2D-SiC_f/SiC composites after exposure to combustion gas environment is manifested as a decrease in static toughness, and the interphase transition is the mesoscopic cause of the decrease in static toughness of the composite.

基于涡轮高温燃烧气体模拟试验平台，对二维平织SiC _f /BN/SiC复合材料在两种燃烧条件下进行了长期燃烧气体环境暴露试验。单轴拉伸试验、断裂形貌表征和无损检测分析揭示了复合材料暴露于燃烧气体环境后的降解和微观结构演变。结果表明，2D-SiC _f /SiC复合材料暴露于燃烧气体环境后的降解表现为静态韧性下降，相变是复合材料静态韧性下降的细观原因。