Extend CoCrAlY and Pt Sputter-Deposition Technology to Provide Coatings on FT4 Turbine Vanes for at-Sea Evaluation.
Technical rept. 16 Jan-31 Dec 76,
BATTELLE PACIFIC NORTHWEST LABS RICHLAND WASH
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The application of high-rate dc triode sputtering technology to the deposition of CoCrAlY alloy and Pt coatings on first-stage FT4 and LM-2500 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, a approximately equal to 0.0002 inch thick layer of Pt was sputter deposited both as an overlayer on the CoCrAlY and as an interlayer between the superalloy airfoil andor 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, and thickness distribution results are presented. FT4 vanes coated with CoCrAlY of two Al contents and Pt were delivered to the Navy for at-sea testing. Author
- Coatings, Colorants and Finishes
- Fabrication Metallurgy
- Marine Engineering