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Lubrication of DLC-coated surfaces with MoS [sub] 2 nanotubes in all lubrication regimes : surface roughness and running-in effectsKogovšek, Janez, 1984- ; Remškar, Maja, 1960- ; Kalin, MitjanMoS2 and WS2 nanoparticles, on the one hand, and DLC coatings, on the other, are receiving increasing attention for tribological applications. However, investigations that combine DLC coatings and ... lubrication using nanoparticles are very scarce and the understanding of such tribological systems remains limited. In this work we looked at such a lubrication system by studying the effects of surface roughness and running-in on the behaviour of DLC-coated contacts in all lubrication regimes. We also present a model of how the surface roughness influences the mechanism of lubrication for the MoS2 nanotubes. This model is based on a 2D 1:1 projection scale of dimensions of the surface profile, including its asperities, nanoparticles and film thicknesses, and is thus independent of the contacting materials. It was realized that the addition of the nanotubes to the base oil lowered the coefficient of friction of the DLC by more than 50% for the smooth, DLC-coated surfaces and up to 40% for the rough, DLC-coated surfaces. The nanoparticles were the most effective under boundary-lubrication conditions and had a negligible effect in the EHL regime. The surface roughness has a notable and two-fold effect: while the friction was lower on the smooth, compared to the rough, DLC-coated surfaces, the rough surfaces were better able to retain the nanoparticles within the contact during the running-in.Source: Wear. - ISSN 0043-1648 (Vol. 303, iss. 1/2, Jun. 2013, str. 361-370)Type of material - article, component partPublish date - 2013Language - englishCOBISS.SI-ID - 12908315
Author
Kogovšek, Janez, 1984- |
Remškar, Maja, 1960- |
Kalin, Mitjan
Topics
nanoparticles |
DLC |
MoS2 nanotubes |
surface roughness |
oil |
lubricant additives |
nanodelci |
nanocevke |
površinska hrapavost |
olja |
maziva |
dodatki
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Kogovšek, Janez, 1984- | 32070 |
Remškar, Maja, 1960- | 07560 |
Kalin, Mitjan | 14556 |
Source: Personal bibliographies
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