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METHODS OF FABRICATING ENVIRONMENTAL BARRIER COATINGS FOR SILICON BASED SUBSTRATES

United States Patent Application

20090297718
A1
View the Complete Application at the US Patent & Trademark Office
A method of protecting an article from a high temperature environment, the method includes providing a substrate comprising silicon, forming a slurry coating composition, wherein the composition comprises a metallic silicon powder, a rare-earth oxide, an alkaline earth metal oxide, an aluminum oxide, or a combination comprising at least one of the foregoing, and a binder effective to chemically stabilize the slurry coating, applying a layer of the slurry coating over the substrate, and heat-treating the slurry coating under conditions sufficient to oxidize the metallic silicon powder and form an alkaline earth metal aluminosilicate, a rare-earth silicate, an aluminum silicate, or a combination comprising at least one of the foregoing bonded to the substrate.
Sarrafi-Nour, Reza (Clifton Park, NY), Kool, Lawrence Bernard (Clifton Park, NY)
GENERAL ELECTRIC COMPANY (Schenectady NY)
12/ 128,943
May 29, 2008
GOVERNMENT RIGHTS [0001] This invention was made with Government support under Government contract No. DE-FC26-05NT42643 awarded by the Department of Energy. The Government has certain rights in this invention.