Hot Corrosion Behaviour of Three-Layered Functionally Graded Glass–ceramic–YSZ-based Thermal Barrier Coating System

Hot corrosion and oxidation have detrimental effects on thermal barrier coating (TBC) system during service conditions. Hot corrosion behaviour of novel glass–ceramic–YSZ-based triple-layered functionally graded coating on nimonic superalloy was studied at 900 °C using 80 wt.% Na 2 SO 4 + 20 wt.% NaCl molten salt mixture for 100 h. The coating showed no degradation after long exposure at 900 °C and was capable to serve as an effective barrier to the corrosive environment because of its dense structure and impermeability.