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Meeting Materials Science & Technology 2019
Symposium Sandphobic Thermal/Environmental Barrier Coatings
Presentation Title Effects of Silicate Melt Chemistry on Thermochemical Interactions with Thermal Barrier Oxides
Author(s) Najeb M. Abdul-Jabbar, Paul Kuhn, Sarah M Miller, Carlos G Levi
On-Site Speaker (Planned) Najeb M. Abdul-Jabbar
Abstract Scope Thermochemical interactions between silicate melts and thermal barrier oxides are a crucial component in developing strategies to alleviate environmental degradation of thermal/environmental barrier coatings (T/EBCs) in gas turbine engines. Generally, the crystallization of a rapid-growing apatite silicate in these reactions has proven to be an effective a barrier against subsequent melt infiltration in coating microstructures. In this investigation, the effects of melt chemistry on interactions between yttrium zirconate and molten silicates are examined. Equilibrium experiments reveal that subtle variations in iron and aluminum contents in the silicate melt can diminish the proclivity for apatite formation in favor of a slower-growing garnet phase, which reduces resistance to melt attack via thermochemical routes. This in turn demonstrates the influence of environmental chemistry on coating lifetimes and provides valuable insight into the design of more robust next-generation T/EBC systems.


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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