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Precise strain profile measurement as a function of depth in thermal barrier coatings using high energy synchrotron X-rays
University of Manchester, School of Materials, M13 9PL, UK.
University of Manchester, School of Materials, M13 9PL, UK.
University of Manchester, School of Materials, M13 9PL, UK.
University of Manchester, School of Materials, M13 9PL, UK.
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2016 (English)In: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 113, 122-126 p.Article in journal (Refereed) Published
Abstract [en]

We have developed a method of directly measuring the strain gradient as a function of depth in plasma sprayed Thermal Barrier Coatings (TBCs). A 92.8 keV monochromatic synchrotron X-ray beam was used to penetrate the 10 × 10 × 8 mm samples in transmission geometry. The samples had been heated to 1150 °C and held at that temperature for 190 h. The diffraction patterns were collected using a DECTRIS pilatus3 X CdTe 300 K area detector. The patterns were analyzed by partial circular integration followed by full Rietveld refinement to obtain the lattice parameters of the TBC top coat at 25 μm intervals as function of depth. The coatings surviving the heat treatment process without significant damage were found to exhibit a variable compressive stress state inside the top coat. This was found to be about − 600 MPa at the bond coat interface decreasing in a non-linear fashion towards the surface. By refinement of the data collected from sectors of whole Debye Scherrer rings we were able to estimate both the in-plane and out-of-plane strain.

Place, publisher, year, edition, pages
2016. Vol. 113, 122-126 p.
Keyword [en]
Thermal barrier coatings, High energy synchrotron powder diffraction
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-8711DOI: 10.1016/j.scriptamat.2015.10.032ISI: 000367412400030Scopus ID: 2-s2.0-84952319147OAI: oai:DiVA.org:hv-8711DiVA: diva2:874438
Available from: 2015-11-26 Created: 2015-11-24 Last updated: 2016-08-29Bibliographically approved

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