State of the art thermal barrier coating (TBC) materials and tbc failure mechanisms

Abstract

Thermal barrier coatings (TBCs) are widely used in the aviation industry to improve the service life of components being exposed to high temperatures. Providing a higher resistance compared to conventional coatings, TBCs also improve the performance and lifetime of materials through their thermal insulating characteristic. Resistance of gas turbine components, particularly turbine blades, vanes and combustion chambers, is required to be improved against failures such as corrosion, oxidation and thermal shock as well, since turbine inlet temperatures should be increased to improve the performance of gas turbine engines. Accordingly, it is aimed to obtain a better resistance and durability against the failure mechanisms through enhancement of the methods and materials used in thermal barrier coatings. In this study, thermal barrier coatings used in gas turbines as well as their structure, also the relevant failure mechanisms and the new material groups used in TBCs are discussed.