The coating damage of SiC-coated carbon–carbon (C/C) composite is directly influenced on the anti-oxidation attack and ablation performances of carbon–carbon (C/C) composite substrate. It is unprecedentedly reported that infrared thermal-wave tomography (IR-TWT or TWT) approach with laser as external stimulation source is successfully employed for the evaluation of the SiC damage coated on the C/C composite substrate. The stimulation laser intensity is varied according to a chirp-pulsed chain, and employed to induce the chirp-pulsed radar thermal-wave signal. The thermal-wave signals of SiC-coated C/C composite dependence on coating thickness degradation and substrate material are deeply analyzed by using of one dimensional (1D) thermal-wave transfer analytical model. A temporal amplitude of thermal-wave signal as function of delay time is obtained by using of dual-orthogonal demodulation (DOD) algorithms, and it can be employed to represent thermal-wave transmission and to perform tomography. Experimental results confirm that TWT can be used to accurately and reliably assess the SiC coating damage characterization from the C/C composite substrate.

SiC涂层碳-碳（C / C）复合材料的涂层损伤直接影响碳-碳（C / C）复合材料基材的抗氧化性能和烧蚀性能。前所未有的报道称，以激光作为外部刺激源的红外热波层析成像（IR-TWT或TWT）方法已成功用于评估涂覆在C / C复合衬底上的SiC损伤。刺激激光强度根据a脉冲链而变化，并用于感应the脉冲雷达热波信号。通过使用一维（1D）热波传递分析模型，深入分析了SiC涂层的C / C复合材料的热波信号对涂层厚度退化和基底材料的依赖性。通过使用双正交解调（DOD）算法获得热波信号随时间变化的时间幅度，该时间幅度可以用作热波传输和层析成像的代表。实验结果证实，TWT可以用于准确，可靠地评估C / C复合衬底对SiC涂层的损伤特征。