Abstract
Graphite-like a-C:H(GLCH)/nitride coupled coatings were fabricated on Ti6Al4V alloy by nitriding combined with subsequent magnetron sputtering. The tribological behaviors of the samples were studied in atmosphere, distilled water and artificial seawater by reciprocating–sliding tribometer. The results show that the amorphous GLCH layer and columnar Cr/WC interlayer were deposited on the surface of nitride layer with a thickness of 35μm. In atmosphere, the duplex treated sample has the lowest wear rate attributed to the enhanced load-carrying capacity, which is almost 3 times smaller than that of the single GLCH coating. However, the Ti6Al4V coated with the coupled coatings due to its weak adhesive property shows a poor wear resistance in aqueous environments.
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