Study on Thermally Growth Oxidation Behavior of 8YZ/CoNiCrAlY Thermal Barrier Coating System Under Variation of Temperature

Abstract

The cohesion of thermal barrier coating is reduced by a formation of thermally growth oxidation (TGO) layer at the interface between top coating and bond coating under a high-temperature environment. TGO growth behavior at a constant temperature has been treated mainly on some papers. It is more important to comprehend TGO growth behavior under variation of temperature, because of subjecting cycling thermal loading in actual gas turbine blade. In this study, TGO growth process under variation of temperature in 8YZ/CoNiCrAlY thermal barrier coating system is examined, and then the growth law is shown.