High Temperature Thermal Barrier Coating Evaluation of Yttrium Aluminum Garnet for Gas Turbine Applications

Wednesday, September 15, 2021: 1:00 PM
224 (America's Center)
Mr. Brent Cottom , Solar Turbines Incorporated, San Diego, CA
Dr. Rishi Kumar , Solution Spray Technologies LLC, Storrs, CT
Dr. Chen Jiang , Solution Spray Technologies LLC, Storrs, CT
Mr. Jeffrey Roth , Solution Spray Technologies LLC, Storrs, CT
Dr. Maurice Gell , Solution Spray Technologies LLC, Storrs, CT
Dr. Eric Jordan , Solution Spray Technologies LLC, Storrs, CT
The Solution Precursor Spray Process (SPPS) process has been shown to overcome the durability and property challenges of applying yttrium aluminum garnet (YAG) coating for high temperature thermal barrier coating (TBC) applications (1200°C+) but only limited testing has been performed in representative application environments. In this study, YAG coatings were developed to optimize microstructure and tailor properties for combustion components in an industrial gas turbine. Thermal conductivity, erosion resistance and furnace cycling durability were used to validate YAG properties against the standard yttria-stabilized zirconia coating (YSZ) . Graded and multi-layered microstructures were applied to enhance performance while maintaining durability. Further YAG process development was required to replicate coating properties and optimize deposition on more complex fuel injector nozzle and combustion liner components. Rig testing of both components was performed and compared against the baseline YSZ coating validating the high temperature capability and lower thermal conductivity of the SPPS YAG coating. The components in both tests were cycled for a minimum of ten cycles with the fuel injector test targeting a higher operating temperature while the combustor liner operated at standard conditions. A development engine test is planned to further validate performance in a gas turbine engine of this promising material.