Hot gas erosion resistance of a vapor-deposited Cu–Cr coating

The effectiveness of a vapor-deposited Cu–Cr coating in protecting a NARloy-Z (Cu–3 wt.%Ag–0.5 wt.%Zr) substrate was investigated in a hydrogen/oxygen rocket engine test facility. The rocket facility generated high-temperature, high-pressure flows of combustion gas. The Cu–Cr-coated NARloy-Z article...

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Bibliographic Details
Published in:Surface & coatings technology 1999-04, Vol.114 (1), p.1-6
Main Author: Chiang, K.T
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion prevention
Cr 2O 3 scale
Cu–Cr coating
Exact sciences and technology
Hot gas erosion
LTAVD
Metals. Metallurgy
Oxidation
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Summary:The effectiveness of a vapor-deposited Cu–Cr coating in protecting a NARloy-Z (Cu–3 wt.%Ag–0.5 wt.%Zr) substrate was investigated in a hydrogen/oxygen rocket engine test facility. The rocket facility generated high-temperature, high-pressure flows of combustion gas. The Cu–Cr-coated NARloy-Z article was actively cooled by cryogenic gaseous hydrogen so that the coating surface temperature was maintained below 650°C. The coating provided good protection for the NARloy-Z substrate under both hydrogen- and oxygen-rich hot gas environments. In erosion tests (hydrogen rich), the coating remained as a metallic mixture of Cu and Cr phases. In the erosion/oxidation tests (oxygen rich), the coating surface formed a protective Cr 2O 3 scale under a thin layer of Cu-oxides. The ability of the coating to withstand repetitive thermal shocks from the hot gas impingement without cracking was attributed to the close match of thermal expansion properties between the Cu–Cr coating and the NARloy-Z substrate.
ISSN:0257-8972
1879-3347
DOI:10.1016/S0257-8972(98)00844-5