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Meeting Materials Science & Technology 2019
Symposium Sandphobic Thermal/Environmental Barrier Coatings
Presentation Title High Resolution Non-invasive Characterization of Calcium-magnesium-alumino-silicate Infiltration in Thermal Barrier Coatings
Author(s) Zachary Stein, Sandip Haldar, Chance Barrett, Johnathan Hernandez, Laurene Tetard, Ravisankar Naraparaju, Uwe Schulz, Seetha Raghavan
On-Site Speaker (Planned) Seetha Raghavan
Abstract Scope Calcium-magnesium-alumino-silicate (CMAS) deposits, which melt at turbine temperatures, rapidly penetrate thermal barrier coatings and solidify within the zirconia layer under temperature gradients. This work highlights non-invasive characterization offered by Photo-luminescence (PL)/Raman spectroscopy and Synchrotron X-ray diffraction measurements which provide the pathway for elucidating the degradation mechanisms due to CMAS ingression. The measurements are correlated with i) thermochemical attack mechanisms which reveal the extent of penetration of particulates into the TBC and ii) thermo-mechanical mechanisms which indicate the effects on strain compliance. The results demonstrate how we can assess the impact of CMAS on thermal barrier coatings by capturing the effects of the differences on strain and phase evolution with these high resolution techniques. The measurements pave the way for future ex-situ or in-situ studies that contribute towards a better understanding of failure mechanisms in a close-to-actual engine environment.


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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