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Wear resistant composite coatings
Authors:Zoheir N. Farhat
Affiliation:Materials Engineering Dalhousie University, Halifax, Nova Scotia, Canada B3J 2X4
Abstract:
In the search for wear resistant coatings, nanolaminated composite films composed of alternating metallic and ceramic layers, namely, Al/Al2O3 and Ti/TiN were produced using radio frequency magnetron sputtering. The metal layer thickness in the as-sputtered films of Al/Al2O3 ranged from 70 to 500 nm, and 150 to 450 nm in Ti/TiN. The non-metals (Al2O3 and TiN) layer thicknesses ranged from 10 to 40 nm and total film thicknesses of 10–15 µm. All coatings were characterized and tested for their tribological properties. Friction and wear tests were performed under non-lubricated sliding conditions using a pin-on-disc type tribometer. The coefficient of friction of the composite coatings tested, against a stainless steel pin, varied with the sliding distance. At the early stages of sliding the coefficient of friction rose to a peak, followed by a decrease to a steady-state value. Wear rates and coefficients of friction were related to the hardness and to the structure refinement of the coatings.
Keywords:
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