| Abstract Scope |
Coatings used in hot section components of jet engines and gas turbines experience extreme environments. Engines can ingest particulate matter in the form of volcanic ash, sand, dust, and debris, primarily composed of calcium-magnesium-alumino-silicates (CMAS). These particles can form deposits on the coatings which may cause coating degradation. Understanding coating damage modes and then designing appropriate mitigation strategies to extend coating life is thus valuable.
Multiple mitigation strategies have been proposed in the academic community. This talk will highlight one such development from the University of Minnesota focused on multiphase yttrium and gadolinium zirconate-aluminates for thermal barrier coating applications. These coatings, anticipated to have a higher reactivity with silicate deposits, were synthesized, exposed to different CMAS compositions, and then analyzed for the influence of rare earth (RE) oxide, alumina content, and RE/Zr ratio. The addition of alumina to the coatings increased the diversity in reaction products formed. These additional reaction sequences enhanced the reactive consumption of CMAS deposits. Additionally, industry relevant CMAS-coating interactions will also be discussed. |