Processing and Deposition of Nanocrystalline Oxide Composites for Thermal Barrier Coatings

摘要

This report describes the characterization and thermal stability of nanocrystalline oxide composites for thermal barrier coating applications. Electrophoretic deposition was used to coat the nanocomposite powders onto nickel substrates. Prior to electrophoretic deposition of the nanocomposite powders, bond coats were applied to the nickel substrates by either plasma spraying or by electrophoretic deposition. Two types of coatings (double-layered and compositionally graded coatings) were deposited, characterized and tested for thermal stability. Oxidation studies on the Al2O3-Y2O3-ZrO2 nanocomposite coatings were performed to better understand the mechanism of failure in the thermal barrier coatings.