"Engineered Multilayered Multimaterial Thermal barrier coatings for enhanced durability and functionality"

The durability of novel compositions of plasma sprayed TBCs is of significant interest to realize functional benefits such as lower thermal conductivity and resistance to CMAS like attack. Gadolinium Zirconate (GZO) is one such candidate material. Results from this investigation suggest that while the improved thermo-chemical properties of GZO coatings could offer immense potential, the penalties associated with their lower fracture toughness present significant challenges in fabricating such coatings for higher durability. Engineered multilayered architectures of YSZ and GZO that enable optimization of location specific properties provide a means to address such implementation challenges. The layer arrangement of such multilayered multimaterial TBC systems plays a critical role in determining their furnace cycle life. Utilizing the benefits of processing science to engineer the microstructure of the constituent layers we outline the critical factors that require concurrent consideration to enable such multilayered multimaterial coatings to provide enhanced cyclic durability.