Tribochemical Interactions between Graphene and ZDDP in Friction Tests for Uncoated and W-DLC-Coated HS6-5-2C Steel
Autor: | Joanna Kowalczyk, Monika Madej, Wojciech Dzięgielewski, Andrzej Kulczycki, Magdalena Żółty, Dariusz Ozimina |
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Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
graphene
diamond-like carbon zinc dialkyldithiophosphate lubricant additive surface layers of solid elements Technology Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 |
Zdroj: | Materials, Vol 14, Iss 13, p 3529 (2021) |
Druh dokumentu: | article |
ISSN: | 1996-1944 |
DOI: | 10.3390/ma14133529 |
Popis: | If a lubricant contains structures capable of conducting energy, reactions involving zinc dialkyldithiophosphate (ZDDP) may take place both very close to and away from the solid surfaces, with this indicating that ZDDP can be a highly effective anti-wear (AW) additive. The central thesis of this article is that the tribocatalytic effect is observed only when the energy emitted by the solids is transmitted by ordered molecular structures present in the lubricant, e.g., graphene. The friction tests were carried out for 100Cr6 steel balls in a sliding contact with uncoated or W-DLC-coated HS6-5-2C steel discs in the presence of polyalphaolefin 8 (PAO 8) as the lubricant, which was enhanced with graphene and/or ZDDP. There is sufficient evidence of the interactions occurring between ZDDP and graphene and their effects on the tribological performance of the system. It was also found that the higher the concentration of zinc in the wear area, the lower the wear. This was probably due to the energy transfer resulting from the catalytic decomposition of ZDDP molecules. Graphene, playing the role of the catalyst, contributed to that energy transfer. |
Databáze: | Directory of Open Access Journals |
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