NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Recent developments in high temperature coatings for gas turbine airfoilsThe importance of coatings for hot section airfoils has increased with the drive for more cost-effective use of fuel in a wide variety of gas turbine engines. Minor additions of silicon have been found to appreciably increase the oxidation resistance of plasma-sprayed NiCoCrAlY coatings on a single crystal nickel-base superalloy. Increasing the chromium content of MCrAlY coatings substantially increases the resistance to acidic (Na2SO4-SO3) hot corrosion at temperatures of about 1300 F (704 C) but gives no significant improvement beyond contemporary coatings in the range of 1600 F (871 C). Surface enrichment of MCrAlY coatings with silicon also gives large increases in resistance to acidic hot corrosion in the 1300 F region. The resistance to the thermal stress-induced spalling of zirconia-based thermal barrier coatings has been improved by lowering coating stresses with segmented structures and by controlling the substrate temperature during coating fabrication.
Document ID
19830061036
Document Type
Conference Paper
Authors
Goward, G. W. (United Technologies Corp. Pratt and Whitney Aircraft Group, East Hartford, CT, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1983
Subject Category
METALLIC MATERIALS
Meeting Information
High temperature corrosion; International Conference(San Diego, CA)
Distribution Limits
Public
Copyright
Other