Next Article in Journal
A Tribological Assessment of Ultra High Molecular Weight Polyethylene Types GUR 1020 and GUR 1050 for Orthopedic Applications
Next Article in Special Issue
Tribofilms Forming in Oil-Lubricated Contacts
Previous Article in Journal
Synthesis, Characterization and Tribological Evaluation of New Generation Materials for Aluminum Cold Rolling Oils
Previous Article in Special Issue
On the Growth Rate of Tribomaterial in Bovine Serum Lubricated Sliding Contacts
Article Menu

Export Article

Open AccessFeature PaperArticle
Lubricants 2016, 4(3), 24;

MD Sliding Simulations of Amorphous Tribofilms Consisting of either SiO2 or Carbon

Institute of Strength Physics and Materials Science, 634021 Tomsk, Russia
Department of Metal Physics, Tomsk State University, 634050 Tomsk, Russia
Department of Automated Engineering Technology, Tomsk Polytechnic University, 634050 Tomsk, Russia
Federal Institute for Materials Research and Testing, 12200 Berlin, Germany
Author to whom correspondence should be addressed.
Academic Editor: James Krzanowski
Received: 21 April 2016 / Revised: 17 June 2016 / Accepted: 21 June 2016 / Published: 29 June 2016
(This article belongs to the Special Issue Tribofilms and Solid Lubrication)
Full-Text   |   PDF [13194 KB, uploaded 29 June 2016]   |  


The sliding behaviors of two simplified tribofilms with amorphous structure consisting either of SiO2 molecules or C atoms were simulated by molecular dynamics modeling. The objective was to identify mechanisms explaining the experimentally observed lubricating properties of the two amorphous films. The impacts of layer thickness, normal pressure, temperature and different substrate materials were studied systematically, while the sliding velocity was kept constant at 30 m/s. While the layer thickness was not critical, all the other parameters showed special effects under certain conditions. Normal pressure impeded void formation and could even eliminate voids if applied at high temperature. Stick-slip sliding was changed to smooth sliding at high temperature due to void healing. Considering the carbon film, high friction forces and shearing of the entire film was observed with diamond substrates, whereas interface sliding at low friction forces and an amorphous layer of iron mixed with carbon was observed if the supporting substrates consisted of α-Fe. Both films show a decrease of friction forces and smooth sliding behavior at elevated temperature, corresponding well to the tribological behavior of an advanced nanocomposite sliding against a steel disc under severe stressing conditions when high flash temperatures can be expected. View Full-Text
Keywords: dry friction; amorphous silica film; amorphous carbon film; sliding simulation; molecular dynamics dry friction; amorphous silica film; amorphous carbon film; sliding simulation; molecular dynamics

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Share & Cite This Article

MDPI and ACS Style

Dmitriev, A.I.; Nikonov, A.Y.; Österle, W. MD Sliding Simulations of Amorphous Tribofilms Consisting of either SiO2 or Carbon. Lubricants 2016, 4, 24.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Lubricants EISSN 2075-4442 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top