Honeywell International Inc.
Corrosion and oxidation resistant coatings for gas turbine engines, and methods for producing the same

Abstract:

Disclosed is a superalloy gas turbine engine component including a glass coating. The glass coating is configured for resistance to hot corrosion caused by molten salts of sodium, magnesium, vanadium, and/or sulfur dioxide. The glass coating includes a mixture of two or more metal oxides, which are preferably selected from: barium oxide, silicon oxide, strontium oxide, aluminum oxide, magnesium oxide, calcium oxide, cobalt oxide, boron oxide, iron oxide, zirconium oxide, nickel oxide, and titanium oxide. The glass coating is in fully crystalline form and/or a mixture of crystalline and glass phases, and it has a coefficient of thermal expansion of from about 10 to about 18 .mu.m/m-.degree. C. The glass coating has a thickness over the superalloy gas turbine engine component of about 0.5 mils to about 10 mils.