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Meeting Materials Science & Technology 2019
Symposium Sandphobic Thermal/Environmental Barrier Coatings
Presentation Title Multlayer, Multifunctional, Thermo-structural Coatings to Mitigate Molten Silicate Attack in Aeroengines
Author(s) Sanjay Sampath, Edward Gildersleeve
On-Site Speaker (Planned) Sanjay Sampath
Abstract Scope The need for higher gas turbine operating temperatures has necessitated developments in new thermal and environmental barrier coatings(TBC/EBC). With increasing operating temperatures comes the possibility for ingested siliceous debris (CMAS) to become molten and adhere to the surface of coatings. Depending on the coating microstructure, these molten debris can flow freely into coating or be arrested at the surface via reaction. Of interest are yttria stabilized zirconia (YSZ) and Gadolinium Zirconate (GDZ), which elicit these two disparate interactions. Beyond their unique interaction with CMAS, the inherent microstructure of the coating will have an additional role on the movement of the melt. For example, coatings with high porosity (>15%) or coatings which are dense with vertical cracks (DVC) will have different penetration mechanisms. This study seeks to understand this interplay between the molten CMAS flow and the process-induced microstructure. A multilayer “onion-peel” strategy is proposed as potential mitigation for multi-attack scenarios.


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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