Interface delamination analysis of dissimilar materials: Application to thermal barrier coatings

Abstract

Recent progress of gas turbine technologies requires protection of superalloy components from harsh use environments. To satisfy this requirement, surface protection coatings have been developed. The coatings allow protection of superalloy substrate from use environments, which includes temperature. Among the coatings, thermal barrier coatings (TBCs) have been developed to protect high temperature metal components. TBCs are usually composed of oxide ceramic topcoat layer, metal or intermetallic bond coat layer, and substrate. Currently, yttria stabilized zirconia (YSZ) is believed the best material for TBCs. YSZ-TBCs reduce temperature of a metal component because of its low thermal conductivity and cooling of metal substrate, and allows safety operation of superalloy components.