Abstract
The copper alloyNARloy-Z (Cu-3Ag-0.5Zrwt%)has goodpotential for high heat ux structural applications in hypersonic vehicles because of its high thermal conductivity and high-temperature strength. However, it is subject to severe oxidationat temperatures where it might be used. A Cu-30 vol%Cr protective coating produced by lowtemperature arc vapor deposition was evaluated under dynamic oxidation in an electric arc-heated wind tunnel. The emittance of the coating is greater than the emittance of the alloy, and the recombination ef ciency of the coating is typical of values encountered with metal alloys and metallic oxides. The coating protects the alloy under dynamic oxidation conditions, with specimens gaining less than 1 mg/cm2 over a 10-h exposure period. Protection of the alloy from oxidation results from a continuous layer of Cr2O3 that it is partially shielded from the hostile dynamic oxidation/atomic oxygen environment by a layer of CuO.
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