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Communication Dans Un Congrès Année : 2005

The laser shock adhesion test (LASAT) for production control of thermally sprayed ceramic coatings

Résumé

The adhesion strength of a ceramic coating deposited through direct spraying on a roughened substrate is a key issue in the manufacture of high-quality coatings on industrial components. The purpose of this work was to develop a rapid and discerning procedure for establishing adhesion level of a ceramic coating on a metallic substrate. The LAser Shock Adhesion Test, namely LASAT, was successfully applied to ceramic coatings with irradiation impact on the metallic side. Suitable parameters were found to determine the LASAT adhesion threshold using a standard Nd:YAG laser source. With a laser-irradiated area of several millimeters in diameter, it allowed assessment of the coating threshold on several areas of a coated plate sample. A control procedure for a qualitative assessment of coating adhesion was developed. This testing procedure could be easily used in industry, with possible location of the LASAT unit near to the spraying booth, for a direct production control on coated sample to improve the tracability of manufactured parts. Additional work was carried out to investigate a quantitative approach of the LASAT test to ceramic coating. The purpose was to simulate the shock wave propagation with the RADIOSS® code (a 3D software originally developed for car crash simulation). This code was implemented to calculate the velocity of the material and corresponding pressure throughout the substrate and the coating during the shock wave release (less than 2 ms). Experimental VISAR profiles ('Velocity Interferometer System for Any Reflector') were monitored in the straight direction of the laser-irradiated area on the rear side. These experimental signals (velocity measures) of the ceramic coating could be fitted and compared with a fairly good agreement with simulated profiles obtained by RADIOSS®. This modelling work was the first step towards a more comprehensive coating adhesion strength calculation in the future.
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Dates et versions

hal-00159080 , version 1 (02-07-2007)

Identifiants

  • HAL Id : hal-00159080 , version 1

Citer

Sophie Boileau, Vincent Guipont, Michel Jeandin, Mariette Nivard, Laurent Berthe, et al.. The laser shock adhesion test (LASAT) for production control of thermally sprayed ceramic coatings. ITSC 2005 Thermal spray connects : explore its surfacing potential, 2005, Basel, France. 6 p. ⟨hal-00159080⟩
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