The application of high-rate dc triode sputtering technology to the deposition of CoCrAlY alloy and Pt coatings on first-stage FT4 and LM2500 blades and FT4 vanes for sulfidation protection in marine gas turbines is described. The CoCrAlY coatings were approximately 0.005 inch thick and were applied directly to superalloy blades and vanes and to burner rig test pins. In addition, an less than 0.0003 inch thick layer of Pt was sputter deposited both as an overlayer on the CoCrAlY and as an interlayer between the superalloy airfoil and/or test pin and the CoCrAlY. The Pt coatings were applied on both sputter-deposited CoCrAlY and electron beam evaporated CoCrAlY. Features of the sputter-deposition technology applied are discussed. Microstructural, chemical composition, thickness distribution, and preliminary burner rig test results are presented. FT4 vanes coated with CoCrAlY and electron beam evaporated CoCrAlY. Features of the sputter-deposition technology applied are discussed. Microstructural, chemical composition, thickness distribution, and preliminary burner rig test results are presented. FT4 vanes coated with CoCrAlY of two Al contents and Pt were delivered to the Navy for at-sea testing are described. LM2500 blades were coated with a high Al composition of CoCrAlY and delivered to General Electric Company, Evendale, Ohio for engine testing. Comments on engine testing and burner rig testing currently being conducted are also included. (DePo)
Recent developments in the application of high-rate sputtering technology to the formation of hot corrosion-resistent metallic coatings on marine gas turbine first-stage vanes and blades
Neuentwicklungen auf dem Gebiet der Metallspritztechnologie fuer das Aufspritzen metallischer Schichten auf die Leitschaufeln von Schiffsgasturbinen
PROC. OF THE 1977 ; 527-537
1977
11 Seiten, 16 Bilder, 8 Tabellen, 8 Quellen
Conference paper
English
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