Optical coherence tomography for the inspection of plasma-sprayed ceramic coatings

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DOIResolve DOI: http://doi.org/10.1007/s11666-007-9051-6
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TypeArticle
Journal titleJournal of Thermal Spray Technology
Volume16
Issue3
Pages435443; # of pages: 9
Subjectceramic coating; nondestructive evaluation; optical coherence tomography; plasma spraying; zirconia
AbstractOptical coherence tomography (OCT) is evaluated as a potential technique for microstructure characterization of plasma-sprayed ceramic coatings. OCT combines the principles of low-coherence interferometry and optical heterodyne detection to obtain both a high axial resolution and a high sensitivity to weakly backscattered light. It can be used to accurately locate interfaces where the refractive index changes abruptly within translucent materials. Therefore, OCT should be sensitive to interlamellar pores and splat interfaces within plasma-sprayed ceramic coatings. In the present work, OCT cross-sectional images of thin yttria-stabilized zirconia (YSZ) coatings are considered. The interferogram envelopes forming the collected images are analyzed individually to successfully gather information related to light attenuation inside the coatings. This light attenuation is shown to be related to the density of interfaces within the coatings as well as to the material oxidation state. The envelope analysis also allows the evaluation of the refractive index of the YSZ nontransformable tetragonal phase.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute
Peer reviewedYes
NRC number48914
NPARC number15769645
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Record identifiere1b93fd8-3eca-4cc0-b4f2-6f7d651ffa01
Record created2010-07-06
Record modified2016-05-09
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