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Measurement of interface properties is not new in the thin film and coatings technology. However most of the available techniques provide only a rough measure of the strength of interfaces. Such interface strength between thin coatings and substrates is effectively investigated by a pulsed laser induced spallation technique, utilizing shock waves produced by an energy pulse of short duration, and coupled with simultaneous measurement of the spalled film free surface velocity by means of a laser-Doppler-interferometry device (VISAR). The great advantage of this approach is that it is the only method by which the strength of adhesion of a thin film, as well as its modulus of elasticity, can be evaluated accurately and unambiguously. Experimental data are compared against theoretical/numerical results for the generated stress pulse based on the solution of appropriate equations of state implemented in a hydro-dynamic FEM code and are found to be in good agreement.

Additional information

Authors: YOUTSOS A G, JRC Petten (NL)
Bibliographic Reference: Paper presented: European Research Conference on Interfacial Engineering. Il Ciocco (IT), 9-14 October 1996
Availability: Available from (1) as Paper EN 40863 ORA
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