HighTemp5.3
Impact of CMAS Ingression on Strain Tolerance within the Layers of a Plasma Sprayed Thermal Barrier Coating

Wednesday, June 18, 2014: 9:00 AM
Sun 4 (Gaylord Palms Resort )
Ms. Sanna Siddiqui , University of Central Florida, Orlando, FL
Mr. Stephen Sofronsky , University of Central Florida, Orlando, FL
Dr. John Okasinski , Argonne National Laboratory, Argonne, IL
Dr. Jonathan Almer , Argonne National Laboratory, Argonne, IL
Dr. Li Li , Praxair Surface Technologies, Inc., Indianapolis, IN
Dr. Albert Feuerstein , Praxair Surface Technologies, Inc., Indianapolis, IN
Dr. Seetha Raghavan , University of Central Florida, Orlando, FL
The durability of Thermal barrier coatings (TBCs) used on the turbine blades of aircraft engines has been known to be affected by sand particle ingression comprised of Calcium-Magnesium- Alumina-Silicate (CMAS). Previous studies have shown that these effects present themselves through variations in the thermomechanical and thermochemical properties of the coating. This study investigated the impact of CMAS ingression on the YSZ Topcoat and Thermally Grown Oxide (TGO) strain in a plasma sprayed Thermal Barrier Coating (TBC) sample. In-Situ Synchrotron X-ray Diffraction measurements were taken on the sample under an 80 minute thermal cycle from which the YSZ and TGO peaks were identified and biaxial strain calculations were determined at high temperature. The outcomes from this study can be used to understand the role of CMAS on affecting the strain tolerance of the TBC coating.
See more of: JOINT SESSION - Advanced Aeroengine Turbine Coatings
See more of: High Temperature and Aeroengine Materials