Quality evaluation for air plasma spray thermal barrier coatings with pulsed thermography

<正>Pulsed thermography(PT) as a non-contact non-destructive evaluation(NDE) technique was employed to examine as-sprayed air plasma spray(APS) thermal barrier coatings(TBCs) for quality evaluation.Thickness and micro-structural characteristics play a vital role in determining the quali...

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Bibliographic Details
Published in:Progress in natural science 2011-08, Vol.21 (4), p.301-306
Main Authors: ZHAO, Shi-bin, ZHANG, Cun-lin, WU, Nai-ming, WANG, Hua-ming
Format: Article
Language:English
Subjects:
barrier
coatings(TBCs)
evaluation(NDE)
measurement
microstructure
non-destructive
non-destructive evaluation (NDE)
pulsed
pulsed thermography
thermal
thermal barrier coatings (TBCs)
thermography
thickness
thickness measurement
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Summary:<正>Pulsed thermography(PT) as a non-contact non-destructive evaluation(NDE) technique was employed to examine as-sprayed air plasma spray(APS) thermal barrier coatings(TBCs) for quality evaluation.Thickness and micro-structural characteristics play a vital role in determining the quality.In this paper,PT logarithmic peak second-derivative method was adopted to measure the thickness of top coat.Time dependent thermal images were used to characterize the microstructure which was confirmed by scanning electron microscope(SEM).The results showed that there was relationship between the temperature distribution of the surface and microstructure change in TBCs.Temperature distribution in thermal images and measurement results of thickness were in fairly good agreement with the microstructure change.It can be concluded that it was possible to employ these NDE methods as quality evaluation for as-sprayed TBCs.
ISSN:1002-0071
DOI:10.1016/S1002-0071(12)60061-6