Title: HIGH TEMPERATURE RESIDUAL STRESS MEASUREMENT IN THERMAL BARRIER COATINGS

Abstract:
Thermal barrier coatings (TBC's) are currently utilized in aircraft and diesel engines to prolong the life of metallic components. TBC failure is typically spallation of the top coat due to oxide scale growth at the bond coat/top coat interface. Understanding the residual stresses of the oxide scale growth is thus critical to enhancing the performance and reliability of TBC systems.

In this study, preliminary characterization of the residual stress state in the bond coat, scale, and substrate is presented. The residual strains are measured in a thermally grown oxide scale and in a PtAl bond coat on top of a Rene N5 superalloy substrate. High temperature x-ray diffraction will be used. These results will be compared to our previous work. Experimental difficulties and future work will also be discussed.
(Ref. SXVIIIP-008-97)

Research sponsored by the U. S. Department of Energy, Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Industrial Technologies Industrial Energy Efficiency Division and Advanced Turbine Systems Program. Research facilities sponsored by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Transportation Technologies, as part of the High Temperature Materials Laboratory User Program. Oak Ridge National Laboratory is managed by Lockheed Martin Energy Research Corp. for the U.S. Department of Energy under contract number DE-AC05-96OR22464.

Source: NDE of Ceramics '97 May 4-7, Symposium on Nondestructive Evaluation of Ceramics at the American Ceramic Society 99th Annual Meeting, Cincinnati, Ohio.
Buying the Symposium Proceedings from the American Ceramic Society.