|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials for High Temperature Applications: Next Generation Superalloys and Beyond
||Design of Next Generation Intermetallic Bond Coatings
||David J Jorgensen, Wesley Jackson, Akane Suzuki, Tresa Pollock
|On-Site Speaker (Planned)
Bond coat interlayers in thermal barrier coating (TBC) systems must perform reliably in the complex thermal, chemical and mechanical environment of the turbine engine in order to increase temperature capability. To achieve higher temperatures and /or longer cyclic lives, a spectrum of intrinisic failure modes must be suppressed. Failure may occur at the bond coat – thermally grown oxide (TGO) interface, at the TGO-TBC interface or by oxidation-enhanced propagation of cracks from the coating into the substrate. New tools that guide the design of new intermetallic bond coatings will be discussed. Models for the failure processes suggest that bond coatings should possess improved high temperature strength (creep resistance), low oxide growth stresses and high interfacial toughnesses. Combinatorial experiments on B2-base and L12 intermetallic bond coatings reveal new failure resistant compositional domains for further development.