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Optothermal NDE of thermal-barrier coatings

Par Conseil national de recherches du Canada

DOITrouver le DOI : https://doi.org/10.1007/BF02833789
AuteurRechercher : 1; Rechercher : 1
Affiliation
  1. Conseil national de recherches du Canada
FormatTexte, Article
SujetCoating Thickness; Thermal Effusivity; Heated Area; ZrO₂ Coating; Optical Penetration Depth
Résumé
An optothermal technique is described for the nondestructive evaluation of thermal barriers, such as ceramic plasma-sprayed coatings. This method is noncontact and requires access from one side only of the sample, thereby making it easier to inspect awkwardly shaped or difficult-to-reach pieces. A laser beam irradiates the coated material, raising its surface temperature to some degrees above ambient. The surface temperature is monitored during or after irradiation by an infrared detector to obtain a characteristic temperature-time curve (thermogram). After appropriate processing, the thermogram provides information on the thermal properties of the coating if its thickness is known. Alternatively, the thickness of the coating can be estimated if its thermal properties are known. In either case, the optothermal analysis allows one to evaluate the degree of thermal insulation provided by the coating. Each measurement is performed nondestructively and within a time period of less than 0.5 sec per point using the single-shot method.
Date de publication
Maison d’éditionSpringer
Dans
  • Journal of Materials Engineering 9, nº 1 : 71–79.
Langueanglais
Publications évaluées par des pairsOui
Numéro du CNRCCNRC 26667
NRC-IGM 85-404-196X
Numéro NPARC23004029
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Identificateur de l’enregistrementc4c1362d-ca40-4861-8117-7a78abcabffb
Enregistrement créé2018-09-18
Enregistrement modifié2020-03-17
Date de modification :