To explore the effects of thermal shock cycles on ZrC-C composites, their microstructure, coefficient of thermal expansion (CTE), compressive strength and internal friction behavior after different thermal shock cycles were studied. As the thermal shock cycle between 1500 ℃ and room temperature increased from 0 to 30, the CTE of the ZrC-C composites with the ZrC/PyC (Pyrolytic carbon) weight ratio of 1.7 first increased and then decreased, and its compressive strength increased by 35.8 % (295.4 ± 10.1 MPa) after 10 thermal shock cycles and could still be maintained above 85 % of its original strength after 30 thermal shock cycles. The changed interface bonding strength between ZrC skeleton and PyC resulted in the first decrease and then increase of their internal friction. This work provides an effective strategy for optimizing the thermal shock resistance of ultra-high temperature composites by regulating the component contents.

为了探索热冲击循环对 ZrC-C 复合材料的影响，研究了它们在不同热冲击循环后的微观结构、热膨胀系数 (CTE)、压缩强度和内摩擦行为。随着1500℃至室温之间的热冲击循环从0增加到30，ZrC/PyC（热解碳）重量比为1.7的ZrC-C复合材料的CTE先增加后减小，其抗压强度增加了10 次热冲击循环后为 35.8 % (295.4 ± 10.1 MPa)，并且在 30 次热冲击循环后仍可保持其原始强度的 85 % 以上。ZrC骨架与PyC之间界面结合强度的变化导致其内摩擦先减小后增大。