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METHODS OF FABRICATING ENVIRONMENTAL BARRIER COATINGS FOR SILICON BASED SUBSTRATES
METHODS OF FABRICATING ENVIRONMENTAL BARRIER COATINGS FOR SILICON BASED SUBSTRATES
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机译:硅基基材的环境屏障涂层的制备方法
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摘要
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.
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