Journal
TRIBOLOGY INTERNATIONAL
Volume 122, Issue -, Pages 23-37Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2018.02.015
Keywords
Sliding/rolling; Pure sliding; DLC/Cast iron; MoDTC
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Funding
- Higher Committee for Education Development in Iraq (HCED)
- EPSRC [EP/R001766/1] Funding Source: UKRI
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Diamond-like carbon (DLC)/cast iron (CI) systems have been widely investigated due to their important application in engine components such as cylinders, pistons and more specifically for the cam/follower interface. The pure sliding contact of the DLC/CI system has traditionally been the focus of research; consequently less is understood about sliding/rolling contact systems. In addition, the tribological and tribochemical characteristics of the Molybdenum Dialkyl Dithiocarbamate (MoDTC) as a lubricant additive in such sliding/rolling contacts are not fully understood. In this study, a Mini Traction Machine (MTM) was used to run the experiments using alloy steel balls coated with 15 atomic percent (at. %) hydrogenated DLC (a-C: 15H) rubbing against uncoated cast iron discs. Results showed that the sliding/rolling ratio affects friction, wear and tribochemistry in Cl/DLC systems; pure sliding enhances MoDTC activation. MoDTC decomposes to form MoS2, FeMoO4 and not MoO3. In addition, it was observed that MoS2/FeMoO4 ratio depends on test conditions and affects to the friction performance.
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