Overview of Failure Modes of Pseudo Compositionally Graded Thermal Barrier Coatings and Remedies for Augmenting the Service Life of the Coated Components

摘要

Because of the chemical and thermal stabilities at high-temperature and oxidation resistance, the thermal barrier coatings (TBCs) possess significant importance in the protection of alloys at elevated temperature. It was researched that the layers of thermally grown oxides (TGO) restrictsthe applications because of the spallation, compositionally graded thermal barrier coatings by formation of near uniform non-clustered distribution of TGO enhances the thermal cyclic performance by delayed spallation. In this review, the simulation of failures of thermal barrier coated componentsduring diverse applications by solid particles erosion testing at elevated temperature and high temperature corrosion attack in presence of sulfate and vanadate salts has been reviewed and disserted in detail. Also, this article gives contemplation on significance of composition gradient overthe performance of thermal barrier coating while exposed to elevated temperatures of around 1200 °C.