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Tribology Letters

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01.09.2015 | Original Paper

A methodology for Raman characterisation of MoDTC tribofilms and its application in investigating the influence of surface chemistry on friction performance of MoDTC lubricants

verfasst von: Doris N. Khaemba, Anne Neville, Ardian Morina

Erschienen in: Tribology Letters | Ausgabe 3/2015

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Abstract

In this study, Raman spectroscopy has been employed to understand the influence of surface chemistry on friction in a tribocontact. Tribotests were conducted using molybdenum dialkyldithiocarbamate (MoDTC) lubricant in a steel/steel sliding contact. Firstly, surface chemistry in the high-friction regime, at the beginning of the test, and in the low-friction regime, after long test durations, is investigated. Secondly, the influence of temperature on the surface chemistry of the resulting wear scars was investigated. Results show that at the beginning of tribotests with MoDTC lubricant, iron oxides are formed at the tribocontact which result in high friction. At longer test durations, adsorbed MoDTC on the ferrous surface decomposes to form MoS₂ and low friction is observed. Surface chemistry at the tribocontact has been found to vary depending on the test temperature. At high temperatures, MoS₂ is formed which provides friction reduction, while at low temperatures, molybdenum oxide and amorphous sulphur-rich molybdenum (MoS_x) compounds are formed which do not provide friction reduction. Furthermore, it has been shown that MoS₂ formed within the tribocontact at high temperatures has a slightly disordered crystal structure as a result of tribological processes.

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Titel: A methodology for Raman characterisation of MoDTC tribofilms and its application in investigating the influence of surface chemistry on friction performance of MoDTC lubricants
verfasst von: Doris N. Khaemba
Anne Neville
Ardian Morina
Publikationsdatum: 01.09.2015
Verlag: Springer US
Erschienen in: Tribology Letters / Ausgabe 3/2015
Print ISSN: 1023-8883
Elektronische ISSN: 1573-2711
DOI: https://doi.org/10.1007/s11249-015-0566-6

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