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Lubricants 2015, 3(4), 687-711; doi:10.3390/lubricants3040687

Mechanism of Friction and Wear in MoS2 and ZDDP/F-PTFE Greases under Spectrum Loading Conditions

Materials Science and Engineering Department, University of Texas at Arlington, 501 West First Street, Rm. 231, Arlington, TX 76019, USA
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Author to whom correspondence should be addressed.
Academic Editors: Werner Oesterle and Ga Zhang
Received: 26 July 2015 / Revised: 8 December 2015 / Accepted: 9 December 2015 / Published: 18 December 2015
(This article belongs to the Special Issue Tribofilms and Solid Lubrication)
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Abstract

Two different greases formulated using MoS2 and a combination of ZDDP and functionalized PTFE (F-PTFE) were examined under spectrum loading conditions where loads, frequency, and duration of the steps were treated as variables. Combination of ZDDP and F-PTFE were synergistic resulting in a significant reduction in the wear and friction under spectrum loading condition. Decreasing the time step during the ramp up and ramp down cycles resulted in larger wear for the grease containing MoS2 particles in comparison to ZDDP/F-PTFE in grease. The tribofilm formed on the surface was analyzed using various characterization techniques like SEM, EDS, and Stereo Optical Microscopy. Tribofilms from MoS2 additives had extensive amounts of abrasive and adhesive wear and showed the formation of MoS2 on the surface on the other hand the tribofilms from ZDDP/F-PTFE had smaller amounts of severe wear and exhibited patchy tribofilms of Zn-phosphates as well as sulfides of Zn and Fe. View Full-Text
Keywords: MoS2; ZDDP; PTFE; EDS; lubricants; four-ball tribometer; wear; friction; grease MoS2; ZDDP; PTFE; EDS; lubricants; four-ball tribometer; wear; friction; grease
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).

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MDPI and ACS Style

Bagi, S.D.; Aswath, P.B. Mechanism of Friction and Wear in MoS2 and ZDDP/F-PTFE Greases under Spectrum Loading Conditions. Lubricants 2015, 3, 687-711.

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