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

Lawrence Tinsley, Christine Chalk, John Nicholls, Jörn Mehnen, Rajkumar Roy

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

This 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.
LanguageEnglish
Pages67-74
Number of pages8
JournalNDT and E International
Volume92
Early online date3 Aug 2017
DOIs
Publication statusPublished - 31 Dec 2017

Fingerprint

Physical vapor deposition
Aging of materials
Oxidation
oxidation
coatings
Coatings
diffusivity
trends
Thermal barrier coatings
Thermal diffusion
service life
warning systems
Thermal diffusivity
thermal diffusion
thermal diffusivity
Service life
furnaces
Data acquisition
Thermal conductivity
sintering

Keywords

  • pulse thermography
  • thermal barrier coating
  • thermal diffusivity
  • oxidation ageing

Cite this

Tinsley, Lawrence ; Chalk, Christine ; Nicholls, John ; Mehnen, Jörn ; Roy, Rajkumar . / A study of pulsed thermography for life assessment of thin EB-PVD TBCs undergoing oxidation ageing. In: NDT and E International. 2017 ; Vol. 92. pp. 67-74.
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abstract = "This 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.",
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A study of pulsed thermography for life assessment of thin EB-PVD TBCs undergoing oxidation ageing. / Tinsley, Lawrence; Chalk, Christine; Nicholls, John; Mehnen, Jörn; Roy, Rajkumar .

In: NDT and E International, Vol. 92, 31.12.2017, p. 67-74.

Research output: Contribution to journalArticle

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