Anti-stick coating for internal passages of turbine components
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United States of America Patent
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Jun 24, 2003
Grant Date -
Dec 12, 2002
app pub date -
Jun 12, 2001
filing date -
Jun 12, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An anti-stick coating that inhibits the adhesion of contaminants that form deposits on the internal cooling passages of gas turbine engine components. The anti-stick coating is formed as an outer coating of the internal cooling passages, and preferably overlies an environmental coating such as a diffusion aluminide coating formed on the passage surfaces. The outer coating has a thickness of not greater than three micrometers, and is resistant to adhesion by dirt contaminants as a result of comprising at least one layer of tantala, titania, hafnia, niobium oxide, yttria, silica and/or alumina. The outer coating is preferably deposited directly on the environmental coating by chemical vapor deposition.
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