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

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

doi:10.1364/OE.25.019968

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

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

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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 language	English
Pages (from-to)	19968-19980
Number of pages	13
Journal	Optics Express
Volume	25
Issue number	17
Early online date	9 Aug 2017
DOIs	https://doi.org/10.1364/OE.25.019968
Publication status	Published - 21 Aug 2017

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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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.",

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AU - Diederich, Gilles

AU - Moore, Andrew J.

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N2 - 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.

AB - 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.

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

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

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