Modification of the mechanical surface properties and tribochemistry of structural ceramics by ion beam techniques

• Published in: Surface & coatings technology 1992-10, Vol.59 (1-3), p.249-254
• Main Authors: Fischer, W, Wituschek, H, Wolf, G K, Ferber, H, Heinze, R, Woydt, M
• Format: Article
• Language: English
• ISSN: 0257-8972

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 material 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 Si sub 3 N sub 4 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 Si sub 3 N sub 4 samples in rolling contact exhibited a 10-50 times lower wear rate under unlubricated conditions, after ion implantation even under high loads.