Flexible Protective DLC Films On Rubber:
Fundamental Concepts And Applications
Author(s)
Y. T. Pei, X. L. Bui, D. Martinez-Martinez, J. P. van der Pal
& J. Th. M. De Hosson
Abstract
Dynamic rubber seals are major sources of friction of lubrication systems and
bearings, which may take up to 70% of the total friction. The solution we present
is to coat rubber with DLC thin films by which the coefficient of friction is
reduced from above 1.5 to below 0.15. Coating rubber is very challenging
because the film/coating must be flexible and strongly adhered to the surface.
Here we present and discuss our novel approach by depositing flexible DLC
films on various rubbers via self-segmentation. By making use of the substantial
thermal mismatch between DLC film and rubber substrates a dense crack
network forms in DLC films and contributes to flexibility. The size of film
micro-segments can be tuned by varying the bias voltage of pulsed-DC plasma
CVD, which governs the amplitude of the substrate temperature variation during
deposition. An analytical model is developed to predict the crack spacing
(equivalent to the size of film segments) and the result fits well to the measured
data. The formation mechanism of crack network and its effect on the flexibility
and friction of DLC film coated rubbers are scrutinized. This paper provides
generic design rules for the deposition of flexible and ultra-low friction films on
rubber seals and the approach can drastically reduce the energy consumption in
bearings and lubrication systems.
Keywords: DLC film, flexibility, rubber substrate, magnetron sputtering,
tribology.
Keywords
DLC film, flexibility, rubber substrate, magnetron sputtering,
tribology
Related Book
Other papers in this volume
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