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Meeting Materials Science & Technology 2019
Symposium Sandphobic Thermal/Environmental Barrier Coatings
Presentation Title Progress and Challenges in Understanding CMAS Attack and Developing CMAS-phobic T/EBCs
Author(s) Andy Nieto, Clara Hofmeister-Mock, Richa Agrawal, Luis Bravo, Anindya Ghoshal, Michael Walock, Muthuvel Murugan
On-Site Speaker (Planned) Andy Nieto
Abstract Scope This talk will examine the studies conducted over the last decade or so on the mechanisms of calcia-magnesia-alumina-silicate (CMAS) attack on thermal and environmental barrier coatings (T/EBCs). Gas turbine engines are exposed to partially and fully molten environmental particulates, such as volcanic ash, runway debris, dust, salt, and sand (collectively referred to as CMAS formers). These molten particulates accumulate on the surface of T/EBCs on turbine blades where they can cause airflow blockage and induce adverse chemical reactions on the ceramic coatings. The current set of TBC solutions have been optimized for low thermal conductivity and high erosion resistance. New T/EBCs must incorporate these properties alongside resistance to CMAS attack and ideally provide non-wetting behavior with molten CMAS. This talk addresses the key findings on CMAS attack mechanisms and the evaluation of promising solutions for preventing CMAS damage. Lastly, guidance on future research efforts to achieve CMAS-phobic T/EBCs is presented.


Army Advances in Sandphobic Thermal/Environmental Barrier Coatings
CMAS-Resistant YSZ-Rare Earth Oxide Composite Coatings
CMAS Removal by Spectrally Guided Laser Ablation
Development of Novel CMAS/VA Resistant TBCS: Influence of Chemical Composition and the Microstructure
Effects of Silicate Melt Chemistry on Thermochemical Interactions with Thermal Barrier Oxides
High Resolution Non-invasive Characterization of Calcium-magnesium-alumino-silicate Infiltration in Thermal Barrier Coatings
Multiphase Thermal Barrier Coatings for Broad-base Resistance to Silicate Deposits
Multlayer, Multifunctional, Thermo-structural Coatings to Mitigate Molten Silicate Attack in Aeroengines
Non-silicate Ceramic T-EBC Coatings for SiC CMCs
Numerical Investigation of Particle Deposition in Gas Turbine Blades
Processing of Laser Surface Modification of Functionally Graded Alumina/CYSZ Thermal Barrier Coating
Progress and Challenges in Understanding CMAS Attack and Developing CMAS-phobic T/EBCs
Turbulence Modulation Effects in Particle-laden Shear Driven Flows and its Impact on Material Deposition

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