Abstract
A Re- and Y-modified γ′ + γ Pt bond coat was synthesized by diffusing 25 μm layer of Ni-6 wt%Re–0.5 wt%Y alloy and 5 μm layer of Pt into a Ni-based superalloy. It was observed that the modified bond coat can extend the useful life of thermal barrier coating systems with yttria-stabilized zirconia as top coat by more than double relative to the conventional bond coat synthesized by diffusing 8 μm layer of Pt into the same superalloy. The superior performance of the modified bond coat is explained in terms of the combined beneficial effects of Re and Y on the oxidation properties as determined from thermal exposure tests at 1150 °C and detailed microstructural characterization using various electron-optical techniques.
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