Advanced Environmental Barrier Coating Testing and Development for Gas Turbine Engines

Environmental barrier coatings (EBCs) are an enabling technology for the use of SiC-based ceramic matrix composites (CMCs) in next generation gas turbine engines. SiC-based CMCs are lightweight and have higher temperature stability than traditional nickel based superalloys. However, SiC is susceptible to rapid oxidation and recession due to high temperature reactions with water vapor and other combustion species. Thus, EBCs were developed to protect these components and extend operating lifetime. In the extreme engine environment, EBCs must be able to withstand a variety of damage mechanisms and the synergies of degradation between them. This presentation will provide an overview of NASA Glenn Research Center, current aeronautics research, and an introduction to EBC failure modes and environmental durability test methods.