Measurement of direct strain optic coefficient of YSZ thermal barrier coatings at GHz frequencies

Peter J. Schemmel, Gilles Diederich, Andrew J. Moore

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Abstract

We report the first observation of stress induced birefringence in air plasma sprayed (APS) thermal barrier coatings (TBCs) using a reflection based polariscope and GHz illumination. Strain optic coefficients of (−0.0133 ± 0.0102) × 10−9 and (−0.0190 ± 0.0043) × 10−9 were measured for yttria-stabilized zirconia (YSZ) APS coatings of the same thickness deposited on substrates of 3 mm and 1 mm mild steel. The reflection measurement approach was validated by additional measurements of the stress optic coefficient of bulk yttria-partially stabilized zirconia (YTZP) ceramic that were in agreement with previously reported transmission measurements. The ultimate application of this technique is the prediction of remaining life in TBCs.

Original languageEnglish
Pages (from-to)19968-19980
Number of pages13
JournalOptics Express
Volume25
Issue number17
Early online date9 Aug 2017
DOIs
Publication statusPublished - 21 Aug 2017

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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