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Experimental results of friction and topography measurements are presented which demonstrate the mutual modification of friction and contact topography. The effect of topographical ‘landmarks’ on friction was tested by Al 2 O 3 -balls sliding over Ti-ridges on Ti-surface and by Si 3 N 4 -balls sliding over grooves in SiO 2 -surfaces. However, experiments of...
Contact formation and development are the basis of friction and wear modelling and understanding. Unanimously topography formation and development in friction contacts are regarded of highest importance for understanding and modelling friction processes. The frequently found running in behaviour of sliding contacts is—aside from the build up of reaction and transfer layers-at least partly caused by...
Different diamond-like carbon (DLC) coatings on a steel substrate (100Cr6) were tested under slip-rolling friction conditions against uncoated counter bodies of the same steel. The initial maximum Hertzian pressure was varied in a range of P 0 =1.5–2.3GPa. The friction tests were carried out under dry conditions and with an unadditivated paraffin oil as lubricant. It could be shown that the...
Diamond like carbon (DLC)-coatings are applied very successfully on computer discs. Sliding friction tests confirm their high performance as dry lubricants with friction coefficients (COFs) below 0.1. In contrast to sliding tests, until very recently most of the DLC-coatings failed in slip-rolling test after fewer cycles than uncoated samples. However, present tests with DLC-coatings of seven different...
Aim of the present work is to derive a correlation between roughness and friction force. This part II of a paper series tests the elastic deformation model presented in part I on more general tribosystems. Where in part I the influence of a single artificially generated step on friction force was investigated, part II considers the influence of two and more structures inside the contact area on friction...
Part I of this paper series presents experiments whose goal is to reveal a correlation between roughness and friction force for contact areas on the micrometer scale. An elastic deformation model was developed to describe this correlation. This model concentrates on friction processes which are dominated by elastic deformation. The experiments were performed on defined model tribosystems with a tribometer...
Innumerable papers have been published so far describing tribological investigations of thin hard coatings based on TiN. Analysis of the presented results demonstrates a large dispersion of measured friction and wear numbers, whereas TiN-coated pieces and tools have proved their benefits in a broad area of application. Therefore an attempt was made to clarify the influences on friction and wear test...
The application of advanced materials in various areas of contemporary technology can lead to improvements in the function, quality and performance of engineering components and systems. In this paper, an overview of the developments in high performance materials, both organic and inorganic based, is given. This includes thin hard coatings because of their increasing importance in tribological improvements...
The potential and limitations of tribosimulations for preselection of materials or coatings for technical application and for tribological failure analysis are the objectives of this article.The results of relatively simple pin-on-disc tests correlate reasonably well with the real cutting performance of coated tools, so that less expensive procedures for coating optimization can be proposed.A short-run...
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