Abstract
A Cu—30vol.%Cr coating produced by co-evaporation of Cu and Cr was evaluated in an electric arc-heated wind tunnel. The wind tunnel generated high-velocity, dissociated air containing atomic oxygen. The coating provided good oxidation protection for the copper alloy substrate under dynamic environment at 650–760°C. The oxide morphologies of the coating under dynamic conditions were distinct from those of static oxidation. The atomic oxygen in the gas stream accelerated the oxidative evaporation of Cr metal resulting in the formation of a porous layer of Cu-oxides on the coating surface. Oxidation resistance of the coating derived from a continuous layer of Cr 2O 3 formed underneath the external Cu-oxides so that the Cr 2O 3 scale was shielded from the hostile dynamic oxidation/atomic oxygen environment.
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