A study of pulsed thermography for life assessment of thin EB-PVD TBCs undergoing oxidation ageing

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dc.contributor.authorTinsley, Lawrence
dc.contributor.authorChalk, Christine
dc.contributor.authorNicholls, John R.
dc.contributor.authorMehnen, Jorn
dc.contributor.authorRoy, Rajkumar
dc.date.accessioned2017-10-11T09:51:07Z
dc.date.available2017-10-11T09:51:07Z
dc.date.issued2017-08-03
dc.description.abstractThis paper presents an assessment of ageing for thin Thermal Barrier Coatings (TBC) using active thermography. As TBCs undergo ageing during their service life, sintering changes the porosity, elements migrate from the substrate, and micro-cracks build up in the structure of the material, exhibiting a change in thermal conductivity and diffusion properties. As the material ages and these properties change over time, it is possible to exploit trends in this change for characterisation of coating ageing, which would provide a diagnostics tool to estimate remaining useful life. In this study, through-depth diffusivity measurement has been applied to thin EB-PVD coatings which are artificially aged via oxidation furnace cycles. In order to address the difficulties of capturing a fast thermal event in a thin coating, a novel parametric study approach has been carried out to optimise data capture and analysis, maximising available frames for the model fitting step. Through-depth diffusivities have been measured during ageing for six samples, yielding a repeatable trend in thermal diffusivity measurements, with three features, which can be exploited for ageing characterisation of thin EB-PVD TBCs, and used as an alarm of imminent failure.en_UK
dc.identifier.citationTinsley L, Chalk C, Nicholls J, et al., (2017) A study of pulsed thermography for life assessment of thin EB-PVD TBCs undergoing oxidation ageing. NDT & E International, Volume 92, December 2017, pp. 67-74en_UK
dc.identifier.cris18321834
dc.identifier.issn0963-8695
dc.identifier.urihttps://doi.org/10.1016/j.ndteint.2017.08.001
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/12613
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectPulse thermographyen_UK
dc.subjectThermal Barrier Coatingen_UK
dc.subjectThermal diffusivityen_UK
dc.subjectOxidation ageingen_UK
dc.titleA study of pulsed thermography for life assessment of thin EB-PVD TBCs undergoing oxidation ageingen_UK
dc.typeArticleen_UK

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