<i>In Situ </i>Thermal Gradient Controlled Investigation of Spallation -Experimental Design and Preliminary Results

Abstract

Based on a coupled numerical and experimental approach, the design and implementation of an in situ thermal-gradient-controlled cyclic oxidation test, dedicated to the investigation of the TGO and TBC spallation, is presented. The influence of the specimen through thickness thermal gradient as well as the benefits of the video real-time monitoring of the cooling phase of an oxidation test is discussed in the case of the spallation of an alumina scale grown on FeCrAl alloys.

Thermal barrier coatings adherence and spallation: Interfacial indentation resistance and cyclic oxidation behaviour under thermal gradient

“…In addition, cyclic oxidation is performed using a dedicated oxidation equipment able to impose a controlled thermal gradient through the specimen thickness [9]. Specifically, the oxidation/spallation testing equipment includes the possibility to monitor in situ, using various optical means such as high resolution, infrared and rapid cameras, the evolution of the material surface while thermally cycled or shocked.…”