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  4. Ultra-low friction of biodiesel lubricated ta-C coatings
 
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2014
Journal Article
Title

Ultra-low friction of biodiesel lubricated ta-C coatings

Abstract
The formation of an ultra-low friction system was observed for ta-C coated surfaces lubricated with biodiesel containing petrodiesel. The tribosystem was compared to pure petrodiesel and engine oil lubrication and to uncoated steel surfaces. Friction was found to be lower for more than 50% over the petrodiesel lubricated or the uncoated state. Different tribological oscillating test setups, simulating high and low contact pressure, were used to characterise friction and wear. Unusual high wear was found for some ultra-low friction experiments. Also, in one test setup the beginning of the ultra-low friction state was observed as a sudden drop of the friction coefficient after several minutes of running in. An assessment of biodiesel components and related lubricants showed that all investigated fatty-acid based lubricants contribute to the formation of the ultra-low friction system. Obviously not their chemical head function is important but rather their fatty-acid origin.
Author(s)
Makowski, Stefan  
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Weihnacht, Volker  
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Schaller, Frank  
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Leson, Andreas  
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Journal
Tribology international  
Project(s)
CarboFunctCoat
Funder
European Commission EC  
Open Access
File(s)
Download (2.68 MB)
DOI
10.24406/publica-r-235435
10.1016/j.triboint.2013.11.002
Language
English
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Keyword(s)
  • Biodiesel

  • superlubricity

  • ta-C

  • ultra-low friction

  • components

  • DLC

  • lubricity

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