|About this Abstract
||Materials Science & Technology 2020
||Coatings to Protect Materials from Extreme Environments
||Cyclic Steam Oxidation of Single Layer Ytterbium Disilicate Environmental Barrier Coatings
||Kenneth Kane, Padraig Stack, Eugenio Garcia, Sanjay Sampath, Bruce Pint
|On-Site Speaker (Planned)
Environmental barrier coatings (EBCs) have become an industry standard for protecting SiC-based ceramic matrix composites (CMCs) in water vapor containing combustion environments, primarily being utilized as post-combustion stationary components in aerospace jet turbines. The current generation of EBCs are temperature limited by the melting point of the silicon bond coat, 1414°C. The next generation of EBCs without a bond coating are now being evaluated for industrial gas turbine applications where longer lifetimes and potentially increased temperatures are required. The current study examines the response of single layer atmospheric plasma spray (APS) ytterbium disilicate (YbDS) EBCs deposited onto CVD SiC to 1-h furnace cycle testing in air-90%H2O at 1250°-1350°C and evaluates the impact of substrate roughness on coating adhesion. Research sponsored by the U. S. Department of Energy, Office of Fossil Energy, Advanced Turbine Program.