Improved performance thermal barrier coatingsThermal barrier coatings offer an attractive approach to improving the durability and efficiency of the hot section of heat engines. The coatings typically consist of an inner alloy bond coating about 0.01 cm thick resistant to oxidation and hot corrosion and an outer ceramic layer, usually a stabilized zirconia, 0.01-0.05 cm thick. Here, the materials, thermomechanical stress, and hot corrosion problems associated with thermal barrier coatings are reviewed along with the capabilities and limitations of current technology. The coatings discussed include ZrO2-Y2O3/NiCrAlY, ZrO2-Y2O3/NiCoCrAlY, ZrO2-MgO/NiCoCrAlY, CaO-SiO2/Co-Cr-Al-Y, and CaO-SiO2/NiCrAlY systems. It is emphasized that the performance of thermal barrier coatings is governed by many complex and interrelated factors, so that optimization of these coatings always involves certain tradeoffs.
Document ID
19830061043
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Levine, S. R. (NASA Lewis Research Center Cleveland, OH, United States)
Miller, R. A. (NASA Lewis Research Center Cleveland, OH, United States)
Stecura, S. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1983
Subject Category
Nonmetallic Materials
Meeting Information
Meeting: High temperature corrosion; International Conference