Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 6

Tailoring of multilayer structure to tribological conditions

nr katalogowy: 81489

Wear is a result of one or complex processes like: erosion, abrasion, impact, metal-to-metal contact, oxidation, and corrosion. Several classification schemes of wear have been developed to understand wear processes. One or more fundamental wear mechanisms may play a crucial role in a real process including a mechanical damage [1]. In many devices, damage generally occurs by means of adhesive, abrasive, corrosive or fatigue wear [2]. The tribology-related engineering applications for highly stressed components require development of new multifunctional thin film systems providing superior mechanical, tribological, chemical etc. performance. It could be achieved by joining properties of different type of materials in multilayer coatings [3÷9]. Currently, a surface modification pays much attention. A set of alternate layers of hard and soft phases as well as appropriate buffer layer close to the substrate, can lead to coating quality improvement and increase adhesion to the substrate [10÷18]. Multilayer coatings are composed of alternately stacked layers of hard and soft phases with thicknesses of a few to tens of nanometers. A combination of alternate layers may lead to considerable hardness and high flexibility as well as good adhesion to substrates. Possible cracks propagation through ceramic coating can be stopped at the ceramic/metallic interface due to a plastic flow. Energy of brittle cracking is compensating by the plastic deformation. However, in some sorts of application, like tribological coatings for medical application, namely, surgical tools, an amount of metallic phase has to be limited. Otherwise, such coatings may lead to the metalosis, i.e. the metal ions adverse interaction with human organism. The titanium nitride (TiN) is of a special interest due to its corrosion resistance, high hardness and bio- compatibility [19, 20]. The other promising material for wear resistant application is amorphous hydrogenated ca[...]

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