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Thin hard coatings are generally used for surface enhancement. However, it was theoretically predicted that thin hard coatings may have a weakening effect of reducing the resistance to onset of plasticity in coating/substrate systems. Such weakening effect may also deteriorate the wear property of a coated system. In this study, we report a direct experimental validation of the weakening effect. Spherical...
TiN and TiAlN coatings deposited on copper, high speed steel and cemented carbide are used to study the effect of elastic modulus mismatch between coating and substrate on the friction and wear properties. Wear volume and failure mechanism are analyzed by optical profilometer, scanning electron microscope and focused ion beam techniques. It is found that the friction and wear properties of different...
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