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采用红外热波成像技术分别对二维叠层C/SiC(2D C/SiC)复合材料的无SiC涂层盲孔试样和有SiC涂层的三点弯曲强度试样的氧化损伤进行无损检测。分析了材料氧化损伤与热辐射强度信号之间的关系,以及热扩散系数与材料密度、抗弯强度之间的关系,探索了采用红外热波成像检测和评价2D C/SiC氧化损伤的可行性。检测结果表明:红外热波成像可以直观地反映2D C/SiC复合材料的氧化损伤。2D C/SiC氧化后的密度随热扩散系数的减小呈对数降低,其抗弯强度随热扩散系数的减小呈抛物线降低。由此得出,热扩散系数可以作为衡量陶瓷基复合材料的氧化损伤程度的依据,红外热波成像是一种无损检测陶瓷基复合材料氧化损伤的有效方法。
The non-destructive testing of two-dimensional laminated C / SiC (2D C / SiC) composites with non-SiC coated blind hole samples and three-point bending strength specimens with SiC coating was performed by infrared thermal imaging . The relationship between oxidative damage and thermal radiation intensity signals was analyzed. The relationship between thermal diffusivity and material density and flexural strength was also discussed. The feasibility of using infrared thermal imaging to detect and evaluate 2D C / SiC oxidative damage . The results show that infrared thermal imaging can directly reflect the oxidative damage of 2D C / SiC composites. The density of 2D C / SiC oxidized decreases logarithmically with the decrease of thermal diffusivity, and its bending strength decreases parabolically with the decrease of thermal diffusivity. It is concluded that thermal diffusivity can be used as a basis for measuring the degree of oxidative damage of ceramic matrix composites. Infrared thermal imaging is an effective method for nondestructive testing of oxidative damage of ceramic matrix composites.