Thermal Barrier Coating on a Ni based single crystal superalloy with Plasma Electrolytic Oxidation

Abstract

The turbine blades made of Ni based alloy are conventionally coated with ZrO2 in order to increase turbine inlet temperature. The ZrO2 coating is usually processed with electron-beam physical-vapor-deposition or air-plasma-spray which are very expensive. In this study, we focus on plasma electrolytic oxidation (PEO) technique for ceramic coating because the PEO is low cost processing and can be applied for machinery parts with large size and complex shape. We challenge to fabricate zirconia base ceramic coating on a metal with PEO by incorporating metal species from electrolyte into the coating.