Coated superalloy gas turbine components

Details Coated superalloy gas turbine components Coated superalloy gas turbine components

B - Operations, Transporting

32

B

117/230

B32B 15/04 (2006.01) C23C 30/00 (2006.01) F01D 5/28 (2006.01)

Patent

CA 1248420

COATED SUPERALLOY GAS TURBINE COMPONENTS ABSTRACT OF THE DISCLOSURE Low temperature regime hot corrosion of superalloy components in gas turbines is reduced by the application thereover of cobalt - chromium alloys, the chromium content of such coatings (final composition) being in the 37.5 - 50 weight percent range. To the extent practicable, aluminum content of these coatings is kept to a minimum. In any event, during the annealing step some small amount at least of aluminum migrates from the superalloy into the coating. At completion of the annealing operation, the aluminum content at the exterior surface of the final coating, however, is to be less than the concentration of aluminum that will form a continuous film of aluminum oxide.

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