Cleaning of internal passages of airfoils
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United States of America Patent
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Nov 5, 2002
Grant Date -
Jun 20, 2002
app pub date -
Dec 19, 2000
filing date -
Dec 19, 2000
priority date (Note) -
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Abstract
A chemical cleaning method for cleaning an internal passage of an engine-run gas turbine engine airfoil wherein the airfoil is immersed in an inorganic hydroxide medium at superambient temperature and atmospheric pressure for a short time to remove accumulated oxides and dirt from the internal passage. The hydroxide medium can comprise molten KOH and immersion times of the engine-run airfoil not exceeding 10 minutes are involved.
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