热障涂层表面裂纹水浸超声检测

Immersion ultrasonic testing of surface cracks on thermal barrier coatings

为有效检测热障涂层(TBCs)表面裂纹,进行了热障涂层表面裂纹水浸超声检测技术的应用研究。以常用的大气等离子喷涂(APS)热障涂层作为试验材料,采用水浸超声检测回波声程差和C扫描图像对不同深度、宽度和长度的热障涂层表面裂纹进行了表征。结果表明:热障涂层基体材料对热障涂层表面裂纹的检测效果无明显影响;通过优化检测参数和合理选用仪器探头,利用水浸超声方法可实现对热障涂层表面深度为0.1mm、长度为2mm裂纹的有效检测;水浸超声检测技术可以获得裂纹的长度、深度参数,是解决热障涂层表面裂纹检测问题的有效方法。

In order to effectively detect the surface cracks on thermal barrier coatings(TBCs),the applicability of immersion ultrasonic testing method was studied.The TBCs samples were fabricated by the air plasma spray(APS),which was most commonly used in the TBCs process.The surface cracks with different depth,width and length were characterized by echo path difference and C scan image.Results indicated that the substrate materials had no obvious influence on the immersion ultrasonic testing results.By optimizing the detection parameters and selecting the instruments and probes properly,the surface crack with the depth of 0.1 mm and the length of 2 mm can be detected effectively by the immersion ultrasonic testing method.The length and depth of the surface cracks on TBCs can also be achieved by immersion ultrasonic testing method,make it an effective way to solve the TBCs surface cracks detection problem.