In-situ simultaneous measurement of thickness, elastic moduli and density of thermal sprayed WC-Co coatings by laser-ultrasonics

• Published in: Journal of thermal spray technology Vol. 16; no. 2; pp. 238 - 244
• Main Authors: BESCOND, C, KRUGER, S. E, LEVESQUE, D, LIMA, R. S, MARPLE, B. R
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 01.06.2007; Springer Nature B.V
• Subjects: Applied sciences; Cemented carbides; Coatings; Cobalt; Density; Exact sciences and technology; In situ measurement; Metals. Metallurgy; Modulus of elasticity; Nondestructive testing; Nonmetallic coatings; Production techniques; Surface acoustic waves; Surface treatment; Tungsten carbide; Ultrasonics; Wave velocity; Tungsten carbide; In situ; Hot spraying; elastic moduli; WC-12Co; Non metal coating; Cobalt; Density; Spray coating; Surface treatment; Thickness; nondestructive testing; Laser; laser-ultrasonics; Cemented carbides; Non destructive test
• ISSN: 1059-9630; 1544-1016
• DOI: 10.1007/s11666-007-9025-8

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.