A method for simultaneous nondestructive evaluation of WC-Co coating thickness, elastic moduli, and density is presented. The technique, known as laser-ultrasonics, is used to generate and detect surface acoustic waves in a noncontact and nondestructive manner. The surface acoustic wave velocity dependence on frequency is compared to a model and an optimization procedure is used to evaluate the coating properties. The results obtained demonstrate the ability of the technique to simultaneously determine such properties with a single and possibly in situ measurement.
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The authors are grateful to Adam Gilbert and Martin Lord for the experimental help in the laser-ultrasonic measurements.
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Bescond, C., Kruger, S.E., Lévesque, D. et al. In-Situ Simultaneous Measurement of Thickness, Elastic Moduli and Density of Thermal Sprayed WC-Co Coatings by Laser-Ultrasonics. J Therm Spray Tech 16, 238–244 (2007). https://doi.org/10.1007/s11666-007-9025-8