Abstract
Ti-contained a-C gradient composite film with a thickness 1.5μm was deposited on medical Ti6Al4V alloy substrate using a closed field unbalanced magnetron sputtering with bias-graded voltage through −20V to −150V. The mechanical and tribological properties were evaluated from nanoindentation, scratch test and ball-on-disk tribometer. Compared with the constant-bias film deposited at −150V, the bias-graded film has the approximate hardness (19GPa) but high toughness and adhesion strength. At a normal load of 10N, the bias-graded composite film shows a low friction coefficient of 0.08 and wear rate of 2.89×10−16m3N−1m−1 in ambient air. While in Hanks’ solution, the film has the same low friction coefficient but low wear rate of 4.63×10−17m3N−1m−1. Excellent wear resistance in Hanks’ solution may bring about a biological application for the Ti-contained a-C gradient composite film.
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