Computational design of CMAS-resistant multiphase thermal and environmental barrier coatings for CMCs

Although ceramic matrix composites (CMCs) have been a material of interest for gas turbine components with operating temperatures 100-150 deg;C higher than typical superalloy materials, the temperature capability of CMCs is still limited by the lack of environmental durability of coatings. One of the main degradation mechanisms at high temperature (gt;1200 deg;C) is due to calcia-magnesia-alumina-silicate (CMAS) deposit. Under this SBIR Phase II program, QuesTek Innovations LLC will continue leveraging its expertise in integrated computational materials engineering (ICME) to design multilayer thermal-environmental barrier coatings (T-EBCs) with improved environmental durability for enhanced performance of CMC engine components. QuesTek will develop/apply its advanced computational thermodynamic models and databases to predict CMAS-coating interactions and design a CMAS-resistant multilayer oxide coating system capable of extended performance to help increase CMC operating temperatures to or above 1482 deg;C. Partnership with Prof. David Poerschke at University of Minnesota (UMN), an expert in T-EBC material and CMAS-induced degradation, will continue in Phase II. UMN will also perform targeted experiments to process, test, characterize, and validate the elements of the designed coating subsystems. Such integrated computational and experimental approach proposed by the QuesTek-UMN team could enable intelligent and accelerated design of T-EBC materials/architecture with balanced performance requirements by reducing the need for time-consuming experiments. Raytheon Technologies Research Center (RTRC) has provided a Letter of Support for the Phase II program (attached at the end of the document), which will provide industrially relevant guidance on the technical tasks and assist in future commercialization of the developed materials/technology.