Combination of DLC coatings and EP additives for improved tribological behaviour of boundary lubricated surfaces |
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| Authors: | B Podgornik S Jacobson S Hogmark |
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| Affiliation: | a Centre for Tribology and Technical Diagnostics, University of Ljubljana, Bogisiceva 8, SI-1000 Ljubljana, Slovenia
b The Tribomaterials Group, Ångström Laboratory, Uppsala University, Box 534, SE-75121 Uppsala, Sweden |
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| Abstract: | The aim of the present investigation was to obtain some further understanding of the mechanism responsible for low-friction behaviour of W-containing DLC coatings (W-DLC) when lubricated with EP additivated oil. Boundary lubricated wear and friction tests were performed under reciprocating sliding motion using a high frequency test rig and a contact pressure of 1.5 GPa. Additionally, some of the tests were performed in a load-scanning reciprocating test rig, with the contact pressure being in the range from 2.4 to 5.6 GPa. The influence of concentration of a sulphur-based EP additive on the friction behaviour was investigated.This investigation showed that W-DLC coatings greatly improve the tribological properties of boundary-lubricated surfaces, especially when pairing coated and uncoated steel surfaces. The improved tribological behaviour was found to be governed by the gradual formation of a WS2 type tribofilm on the steel counter-face or on revealed steel substrate. The friction level depends on the additive concentration. |
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| Keywords: | DLC coatings Boundary lubrication Friction EP additive |
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