Monitoring delamination of thermal barrier coatings during interrupted high-heat-flux laser testing using upconversion luminescence imaging

Jeffrey I. Eldridge, Dongming Zhu, Douglas Edward Wolfe

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Upconversion luminescence imaging of thermal barrier coatings (TBCs) has been shown to successfully monitor TBC delamination progression during interrupted furnace cycling. However, furnace cycling does not adequately model engine conditions where TBC-coated components are subjected to significant heat fluxes that produce through-thickness temperature gradients that may alter both the rate and path of delamination progression. Therefore, new measurements are presented based on luminescence imaging of TBC-coated specimens subjected to interrupted high-heat-flux laser cycling exposures that much better simulate the thermal gradients present in engine conditions. The TBCs tested were deposited by electron-beam physical vapor deposition (EB-PVD) and were composed of 7wt% yttria-stabilized zirconia (7YSZ) with an integrated delamination sensing layer composed of 7YSZ co-doped with erbium and ytterbium (7YSZ:Er,Yb). The high-heat-flux exposures that produce the desired through-thickness thermal gradients were performed using a high power CO2 laser operating at a wavelength of 10.6 microns. Upconversion luminescence images revealed the debond progression produced by the cyclic high-heat-flux exposures and these results were compared to that observed for furnace cycling.

Original languageEnglish (US)
Title of host publicationAdvanced Ceramic Coatings and Materials for Extreme Environments - A Collection of Papers Presented at the 35th International Conference on Advanced Ceramics and Composites, ICACC
Pages3-13
Number of pages11
Volume32
Edition3
StatePublished - 2011
EventAdvanced Ceramic Coatings and Materials for Extreme Environments - 35th International Conference on Advanced Ceramics and Composites, ICACC - Daytona Beach, FL, United States
Duration: Jan 23 2011Jan 28 2011

Other

OtherAdvanced Ceramic Coatings and Materials for Extreme Environments - 35th International Conference on Advanced Ceramics and Composites, ICACC
CountryUnited States
CityDaytona Beach, FL
Period1/23/111/28/11

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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