Abstract A protective laminated MoSi2/Cr coating was deposited on SiC coated carbon/carbon composites by plasma spraying. Under particle impact environment, the Cr interface layer could relax stress concentration and rapidly relieve impact stress by 30% in the laminated coating layer by layer, thus keeping inner layers intact according to the experiment and simulation results. Under thermal shock condition, sudden change of thermal stress induced by the Cr interface layer could also help change the crack propagation path, thus keeping the coated sample without mass loss after 30 thermal cycles between 1500 °C and room temperature. After 157 h oxidation at 1500 °C in static air, the Cr interface layer could also inhibit the formation of penetrating cracks and convert the oxidation mechanism of parabolic mass loss law in MoSi2 coating to linear mass loss law at the final oxidation stage.

中文翻译：

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颗粒冲击高温环境下层状MoSi2/Cr涂层的应力设计

摘要 通过等离子喷涂在SiC 涂层的碳/碳复合材料上沉积了一层保护性MoSi2/Cr 涂层。根据实验和模拟结果，在颗粒冲击环境下，Cr界面层可以缓和应力集中，使层压涂层中的冲击应力逐层迅速降低30%，从而保持内层完整。在热冲击条件下，由 Cr 界面层引起的热应力的突然变化也有助于改变裂纹扩展路径，从而使涂层样品在 1500°C 和室温之间经过 30 次热循环后不会发生质量损失。在静态空气中 1500 °C 氧化 157 h 后，