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Meeting Materials Science & Technology 2019
Symposium Sandphobic Thermal/Environmental Barrier Coatings
Presentation Title CMAS-Resistant YSZ-Rare Earth Oxide Composite Coatings
Author(s) Clara Mock, Michael Walock, Anindya Ghoshal, Muthuvel Murugan, Marc Pepi
On-Site Speaker (Planned) Clara Mock
Abstract Scope Military rotorcraft and aircraft are susceptible to environmental damage from airborne particulates in austere environments. Particulates entering the hot section of the engine melt, impinge on components, and solidify as calcia-magnesia-alumina-silicate (CMAS) glasses. Damage occurs primarily by: 1) CMAS accumulation on turbine blades resulting in clogged air pathways and significant power loss, 2) CMAS infiltration into component thermal barrier coatings (TBC) resulting in reduced engine lifetime and TBC spallation. The proposed TBC uses a composite approach to incorporate the favorable mechanical properties of the current state-of-the-art, yttria stabilized zirconia (YSZ), with CMAS-resistant rare earth-based oxides (REO). Coatings were produced via air plasma spray and tested in engine-simulated environments with synthetic sand. Coatings were characterized with optical and electron microscopies and mechanical properties measured via indentation hardness. Preliminary results show that mixing REOs with YSZ can significantly reduce molten sand adhesion and buildup of glassy CMAS deposits compared to pure YSZ.


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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