Super-low Friction Behavior Of Nanostructured
DLC Composite Coatings
Author(s)
Y. T. Pei, D. Galvan & J. Th. M. De Hosson
Abstract
Advanced TiC/a-C:H nanocomposite coatings have been produced via reactive
deposition in a closed-field unbalanced magnetron sputtering system (Hauzer
HTC-1000). This work concentrates on a detailed mechanical and tribological
characterization of the TiC/a-C:H nanocomposite coatings, in particular focusing
on the dynamic friction and solid lubrication effects of the coatings in terms of
third-body processes between the sliding contact surfaces. The tribological
behavior of the nanocomposite coatings has been scrutinized by means of
ball-on-disc tribo-tests, in conjunction with detailed examinations of the
mechanical properties. In-situ monitoring of the wear depth with the resolution
of submicrometer clearly reveals the correlation between the dynamic friction
and the formation of transfer films on the ball surface. The influence of the
volume fraction and grain size of TiC nanocrystallites on the coating properties
has been examined. The coefficient of friction of dry sliding against 100Cr6 steel
ball and the wear rate of the coatings reach as low as 0.013 and 10-18 m³/(N m
lap), respectively.
Keywords: DLC composite coatings, nanostructure, super-low frication, solid
lubrication, wear resistance.
1 Introduction
The surface of a component is usually the most important engineering factor. It
is often the surface of a work-piece that is subjected to wear and corrosion while
it is in use. Since Leonardo da Vinci (1452-1519) studied an incredible manifold
of tribological subtopics such as friction, wear, bearing materials and lubrication
Keywords
DLC composite coatings, nanostructure, super-low frication, solid
lubrication, wear resistance.
Related Book
Other papers in this volume
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