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 degree 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 Cr2O3 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.
Hot gas erosion resistance of a vapor-deposited Cu-Cr coating
Surface and Coatings Technology ; 114 , 1 ; 1-6
1999
6 Seiten, 13 Quellen
Aufsatz (Zeitschrift)
Englisch
Korrosionsbeständigkeit , chemisches Aufdampfen , Schutzüberzug , Oxidation , Kupferlegierung , Wärmeausdehnung , Raketenantrieb , Temperaturverhalten , Werkstoffprüfung , Wärmestoß , anorganische Verbindung , Chromat , Erosion , Flüssigkeitsraketenantrieb , Heißgaskorrosion , Heißgasstrahl , Erosionskorrosion
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