|About this Abstract
||MS&T23: Materials Science & Technology
||High Temperature Corrosion and Degradation of Structural Materials
||Impact of Environmental Barrier Coating Chemistries on the Oxidation of Si-base Materials
||Mackenzie Ridley, Michael Lance, Trevor Aguirre, Kenneth Kane, Bruce Pint
|On-Site Speaker (Planned)
Environmental barrier coatings (EBCs) are required for protection of SiC components from combustion gases in gas turbine hot sections. A primary failure mode for EBCs is the oxidation of the silicon bond coat, where SiO2 formation at the interface can decrease coating adhesion strength and eventually result in coating delamination. Yb2Si2O7 represents the research standard EBC chemistry due to its stability in steam environments, relatively low oxidant diffusivity, and thermomechanical stability. In this work, multiple EBC chemistries were compared in terms of their effectiveness at mitigating silicon bond coating oxidation relative to a baseline Yb2Si2O7 EBC. Exposures were performed primarily at 1350°C up to 500 h in 90% H2O (g). Results were utilized to develop an updated lifetime prediction model for novel EBC chemistries. This research was sponsored by the U. S. Department of Energy, Office of Fossil Energy and Carbon Management, Advanced Turbine Program.