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High temperature coatings for gas turbines

United States Patent

October 21, 2003
View the Complete Patent at the US Patent & Trademark Office
Coating for high temperature gas turbine components that include a MCrAlX phase, and an aluminum-rich phase, significantly increase oxidation and cracking resistance of the components, thereby increasing their useful life and reducing operating costs. The aluminum-rich phase includes aluminum at a higher concentration than aluminum concentration in the MCrAlX alloy, and an aluminum diffusion-retarding composition, which may include cobalt, nickel, yttrium, zirconium, niobium, molybdenum, rhodium, cadmium, indium, cerium, iron, chromium, tantalum, silicon, boron, carbon, titanium, tungsten, rhenium, platinum, and combinations thereof, and particularly nickel and/or rhenium. The aluminum-rich phase may be derived from a particulate aluminum composite that has a core comprising aluminum and a shell comprising the aluminum diffusion-retarding composition.
Zheng; Xiaoci Maggie (Clifton Park, NY)
09/ 873,964
June 4, 2001
STATEMENT AS TO RIGHTS UNDER FEDERALLY SPONSORED RESEARCH This invention was made with support from the United States Department of Energy under Grant No. DE-PS36-00GO10518. The United States government may have rights in the invention.