Coating system utilizing an oxide diffusion barrier for improved performance and repair capability
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United States of America Patent
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Sep 24, 2002
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N/A
app pub date -
Jul 2, 1999
filing date -
Jul 2, 1999
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Abstract
A coating is described for use on a superalloy substrate comprising a diffusion barrier as an intermediate layer overlying the substrate and underlying a protective coating having a high aluminum content. The diffusion barrier layer is characterized by having low interdiffusivity for elements from the substrate and the coating, a minimal impact on the mechanical properties of the article which is coated, and can be achieved readily using existing coating application techniques or post heat treat processes. The diffusion barrier layer is preferably an oxide ceramic.
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