Multilayer thermal barrier coatings
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United States of America Patent
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Sep 21, 2004
Grant Date -
Jul 24, 2003
app pub date -
Oct 24, 2002
filing date -
Apr 27, 2000
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Abstract
The present invention relates to a thin impermeable top coat on a thermal barrier coating for a metal part, such as a turbine blade, wherein the composite thin top coat is porous, inert, non-sacrificial, less permeable ceramic layer that eliminates the infiltration of environmental contaminants into the thermal barrier coating during operation of the metal part, thereby extending the life of the underlying thermal barrier coating and metal part thereunder.
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