Bond strength and oxidation resistance of YSZ/(Ni, Al) composite coatings

Abstract

YSZ/(Ni, Al) composite coatings were deposited on superalloy Inconel 600 by the electrophoretic deposition (EPD) technique, followed by vacuum sintering method. In comparison with the bond strength of 3·5 N for YSZ coating, the bond strength for YSZ/(Ni, Al) composite coating increased to 4·4 N. YSZ/(Ni, Al) composite coatings exhibited a self crack healing ability by high temperature oxidation. Crack healing is promoted by the increase in the oxidation time exposure at 1100°C. YSZ/(Ni, Al) composite coatings show superior oxidation resistance than that of YSZ coating. Such composite coatings have potential in being used as thermal barrier coatings on superalloy substrates.

Keywords:

• YSZ/(Ni
• Al) composite coatings
• EPD
• Al₂O₃
• NiAl₂O₄
• Self crack healing

Acknowledgements

Authors would like to thank Science and Technology Key Fund Project of Shanghai University of Engineering Science (2011XZ07) and Graduate Research and Innovation Special Projects of Shanghai University of Engineering Science(13KY0504) for financial support.