Microstructural evaluation of ZrO2–MgO coatings

Zirconium oxide, stabilized with magnesium oxide, as a topcoat a coat and Ni–5Al as a bondcoat were air plasma sprayed onto a nickel base alloy substrates. Microstructural and phase changes were observed during the thermal treatment. Formation of nickel-oxide was noticed during the experimentation. Chemical composition profile for the given system, at high temperature, were determined and discussed in this paper. Microstructural characterization was carried out by scanning electron and optical microscopes, whereas phase analysis was carried out by X-ray diffractometer (XRD).