Abstract
The main problems for broader application of fine ceramics are the high cost for production and finishing, the sensitivity to fracture and an unsatisfactory tribological behaviour. Additionally, in recent years, environmental considerations played an increasing role in the discussion concerning the performance of wear partners in tribological systems using environmentally friendly lubricants. To meet these future demands, either the system temperatures will have to be lowered or novel surface-modified materials will have to be developed for use in tribologically sensitive regions of machines. Ion beam techniques can contribute to the improvement in the properties of the near-surface region of these materials. In this work, implantation of titanium and argon ions in polycrystalline Si3N4 is shown to have a considerable influence on the flexural strength, friction, wear and hardness of ceramics which can be applied as automotive and other engineering components. Polycrystalline Si3N4 samples in rolling contact exhibited after titanium implantation a 10–50 times lower wear rate under unlubricated conditions, even under high loads.
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