The Conductivity of Thermal Barrier Coating in Ceramics
Thermal barrier coating or TBC is made of low thermal conductivity ceramics have seen increasing application in gas turbine engines to provide thermal insulation to metallic components from hot gas in the engines used for aircraft propulsion, power generation, and marine propulsion [1–5]. The use of TBCs, along with internal cooling of the underlying superalloy components, provides a temperature reduction of up to 300 K in the surface of the superalloy component. This enables engines to operate at temperatures above the melting temperature of the superalloy, thereby improving the energy efficiency and performance of engines. On the other hand, TBCs contribute to reducing metal temperature, thus improving the duration capability of components. The structure of TBCs Usually, a thermal barrier coating has a four-layered structure: the ceramic thermal barrier layer, the metallic bond coat layer, a thermally grown oxide (TGO) layer between the topcoat and bond coat, and substrate....