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Title: Synchrotron X-ray measurement techniques for thermal barrier coated cylindrical samples under thermal gradients

Measurement techniques to obtain accurate in situ synchrotron strain measurements of thermal barrier coating systems (TBCs) applied to hollow cylindrical specimens are presented in this work. The Electron Beam Physical Vapor Deposition coated specimens with internal cooling were designed to achieve realistic temperature gradients over the TBC coated material such as that occurring in the turbine blades of aeroengines. Effects of the circular cross section on the x-ray diffraction (XRD) measurements in the various layers, including the thermally grown oxide, are investigated using high-energy synchrotron x-rays. Multiple approaches for beam penetration including collection, tangential, and normal to the layers, along with variations in collection parameters are compared for their ability to attain high-resolution XRD data from the internal layers. This study displays the ability to monitor in situ, the response of the internal layers within the TBC, while implementing a thermal gradient across the thickness of the coated sample. The thermal setup maintained coating surface temperatures in the range of operating conditions, while monitoring the substrate cooling, for a controlled thermal gradient. Through variation in measurement location and beam parameters, sufficient intensities are obtained from the internal layers which can be used for depth resolved strain measurements. Results are usedmore » to establish the various techniques for obtaining XRD measurements through multi-layered coating systems and their outcomes will pave the way towards goals in achieving realistic in situ testing of these coatings.« less
Authors:
; ; ;  [1] ; ; ;  [2] ; ;  [3] ;  [4]
  1. Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, Florida 32816 (United States)
  2. German Aerospace Center (DLR), Institute of Materials Research, 51147 Cologne (Germany)
  3. X-Ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
  4. Cleveland State University, 2121 Euclid Avenue, Cleveland, Ohio 44115 (United States)
Publication Date:
OSTI Identifier:
22224167
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 84; Journal Issue: 8; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; CROSS SECTIONS; CYLINDRICAL CONFIGURATION; ELECTRON BEAMS; LAYERS; OXIDES; PHYSICAL VAPOR DEPOSITION; SYNCHROTRON RADIATION; SYNCHROTRONS; TEMPERATURE GRADIENTS; THERMAL BARRIERS; TURBINE BLADES; X RADIATION; X-RAY DETECTION; X-RAY DIFFRACTION