Laser-Ultrasonic Characterization of Thermal Spray Coatings

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Proceedings titleReview of Quantitative Nondestructive Evaluation
Series titleAIP conference proceedings; Volume 700
ConferenceConference on Quantitative Nondestructive Evaluation (QNDE 2003), Green bay, WI, USA, July 27-Aug. 1, 2003, July 27-Aug. 1, 2003, Green bay, WI, USA
AbstractThe laser-ultrasonic technique uses lasers to generate and detect ultrasound and present interesting possibilities for characterizing thermal spray coatings in a non-destructive manner. In this study, the thickness, density and elastic moduli of very uniform, dense and nearly isotropic TiO2 and WC-Co thermal spray coatings are evaluated by using laser generated surface Rayleigh waves and surface skimming longitudinal waves. The elastic properties of the layer are obtained via an inverse procedure based on the minimization of the difference between the measured and calculated Rayleigh wave dispersion curves. The results are compared to the values obtained with an optical microscope for the thickness and the Knoop indentation technique for the elastic modulus. The agreement between the techniques is found to be excellent and laser-ultrasonics appears to be very promising for characterizing such materials. In particular, coatings deposited at high temperature on parts of complex shape could be characterized in-situ where other methods cannot be applied.
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AffiliationNRC Industrial Materials Institute; National Research Council Canada
Peer reviewedYes
NRC number46801
NPARC number18487261
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Record identifierd02eb1d0-4095-4ec1-9ff0-e75bb92a87a9
Record created2011-10-11
Record modified2016-05-09
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