| Abstract Scope |
High-temperature, high-velocity steam conditions are prevalent in power and propulsion applications and present challenging environments for materials durability. Test capabilities relevant for use in this environment are crucial for life prediction of materials undergoing thermochemical degradation mechanisms. In this presentation, a “steam-jet furnace” concept will be presented that is relevant for testing thermochemical stability of oxide-based environmental barrier coatings for SiC composite components used in the hot section of turbine engines. However, the capabilities of this test method go well beyond validating engineering applications, providing a tool for more fundamental materials science investigations. The presentation will address use of the steam-jet furnace to determine enthalpies of formation for gaseous metal hydroxides, complex oxide phase diagram determination, as well as the potential for oxide surface energy determination. Finally, remaining challenges in our understanding of the stability of complex oxides in high-temperature, high-velocity steam will be discussed. |