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Carbon implantation increases the coefficient of friction and wear for titanium, as well as eliminates
oscillating changes in the coefficient of friction for titanium at a depth 25 times greater than the range of
the implanted ions. Carbon implantation changes the characteristics of wear, namely the steel counter
sample sticks to the surface layer of the titanium sample, and fragments of the sample are torn out
during friction. Although the adhesive wear mechanism is dominant, abrasive and oxidative wear can
also be observed. The application of additional xenon ion irradiation does not cause any significant
changes in the wear characteristics. Implantation of the Ti6Al4V alloy with carbon ions reduces its
coefficient of friction. This effect is opposite to that observed for technically pure titanium. Optimum
tribological properties are obtained for the Ti6Al4V alloy, implanted with carbon ions with a fluence of
1 × 1017 C+/cm2. The different effects of carbon ion implantation and xenon ion irradiation on titanium
and Ti6Al4V alloy result from differences between the energy distribution in the samples and the lack
of chemical interactions of xenon atoms. The high energy deposited on the sample surface during the
inelastic collision (Se) with the target electrons induces significant changes in the surface topography
of both metals. This also explains why the diamond-like carbon layer, which is formed as a result of
carbon ion implantation, is removed after being irradiated with xenon ions.
