Sliding Mechanisms In Tribological Contact Of
TMD-C Sputtered Coatings
Author(s)
T. Polcar & A. Cavaleiro
Abstract
In this paper, results on the tribological behaviour of nanocomposite coatings
composed by nanoplatelets of transition metal dichalcogenides (TMD) immersed
in a C-rich amorphous matrix will be presented. It will be shown that this
microstructure will allow low friction coefficients in wide range of surrounding
environments, since TMD platelets are re-oriented in the C-matrix as a
consequence of the mechanical energy liberated in the sliding contact. In this
case, the oxidation of the TMD material is avoided due to the protection
achieved by the C matrix. Examples of TMD-C coatings of the W-S-C and Mo-
Se-C systems will be presented and discussed. After tribological characterization
of the coatings in different environments under different loading conditions
experimental evidence of the wear mechanisms will be given by cross section
transmission electron microscopy, Raman spectroscopy and Auger electron
spectroscopy.
Keywords: sliding mechanisms, self-lubrication coatings, low friction, TMD
coatings.
1 Introduction
The idea behind the use of composite coatings, including different well-known
phase materials with good tribological performance, was to achieve a synergetic
effect that can overcome the individual drawbacks of each specific phase in low
friction demands. One of the most interesting materials for the nanocomposite
design of low friction coatings is any member of the transition metal
Keywords
sliding mechanisms, self-lubrication coatings, low friction, TMD
coatings
Related Book
Other papers in this volume
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