High temperature coating for combustion turbines and...

Details High temperature coating for combustion turbines and... High temperature coating for combustion turbines and...

C - Chemistry, Metallurgy

22

C

C22C 19/00 (2006.01) C22C 1/10 (2006.01) C22C 30/00 (2006.01) C23C 4/06 (2006.01) C23C 4/10 (2006.01) C23C 30/00 (2006.01)

Patent

CA 2146503

Improved overlay compositions are provided for protecting turbine component metallic substrates, preferably nickel and cobalt based super alloys, from oxidation, corrosion, or both. The improved overlay compositions are designed to improve the oxidation and corrosion of the base substrate alloy which is exposed to gaseous environments containing sulfur. The improved performance achieved by incorporating minor amounts of aluminum oxide, preferably Al2O3 to the overlay coating composition. Advantageous properties are also obtained by the incorporation of silicon and hafnium. The improved overlay coatings are advantageously applied to turbine combustors, blades, and vanes.

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