ALUMINATE COATING FOR SILICON-CONTAINING SUBSTRATE

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PROBLEM TO BE SOLVED : To provide a barrier coating for silicon based materials such as those used in high temperature, aqueous environment. SOLUTION : An aspect of the invention is directed to an article including a silicon based substrate, a bond coat comprising silicon on the substrate, and a barrier coat on the bond coat. The barrier coat includes aluminate such as an alkaline earth metal aluminate or a rare earth aluminate, and may be an intermediate coat between the bond coat and a top coat, or it may be the top coat.