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Coatings for directional eutecticsEleven coating systems based on MCrAlY overlay and diffusion aluminide prototypes were evaluated to determine their capability for protecting the gamma/gamma prime-delta directionally solidified eutectic alloy (Ni-20Cb-6Cr-2.5Al) in gas turbine engine applications. Furnace oxidation and hot corrosion, Mach 0.37 burner-rig, tensile ductility, stress-rupture and thermomechanical fatigue tests were used to evaluate the coated gamma/gamma prime-delta alloy. The diffusion aluminide coatings provided adequate oxidation resistance at 1144 K (1600 F) but offered very limited protection in 114 K (1600 F) hot corrosion and 1366 K (2000 F) oxidation tests. A platinum modified NiCrAlY overlay coating exhibited excellent performance in oxidation testing and had no adverse effects upon the eutectic alloy.
Document ID
19750005197
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Felten, E. J. (Pratt and Whitney Aircraft East Hartford, CT, United States)
Strangman, T. E. (Pratt and Whitney Aircraft East Hartford, CT, United States)
Ulion, N. E. (Pratt and Whitney Aircraft East Hartford, CT, United States)
Date Acquired
September 3, 2013
Publication Date
October 1, 1974
Subject Category
Mechanical Engineering
Report/Patent Number
NASA-CR-134735
PWA-5091
Report Number: NASA-CR-134735
Report Number: PWA-5091
Accession Number
75N13269
Funding Number(s)
CONTRACT_GRANT: NAS3-16792
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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