Abstract
The scratch test is a widely used method for the characterization of the adhesion of hard and brittle coatings. The adhesion is related to the critical normal force, leading to adhesive failure. The present work describes a modified scratch test apparatus and procedure for the determination of the adhesion of soft and ductile coatings. It is based on the simultaneous measurement of the normal and tangential forces. The critical normal force is determined from the observation of a transition in the slope of the curve tangential force vs. normal force. Because the applied forces are smaller by two orders of magnitude than in the case of brittle coatings, a special apparatus had to be built. The modified scratch test is used for the determination of the adhesion of silver films sputter deposited on oxide-covered aluminum substrates. The results show that the critical normal force decreases with increasing thickness of the surface oxide.
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