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Degradation Mechanism of Automatic Transmission Fluid by Water as a Contaminant
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0001-9794-8305
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0003-3157-4632
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0002-8972-2944
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2015 (English)In: Proceedings of the Institution of mechanical engineers. Part J, journal of engineering tribology, ISSN 1350-6501, E-ISSN 2041-305X, Vol. 229, no 1, p. 74-85Article in journal (Refereed) Published
Abstract [en]

The degradation mechanism of water contaminated Automatic Transmission Fluids (ATF) was experimentally investigated. Water contaminated ATF was tribotested in a full-scale wet clutch test rig to monitor the friction durability during clutch ageing, and was also statically aged in oven to evaluate the interaction of ATF with water. The bulk properties and chemical nature of the ATF were analysed using viscosity measurements, Fourier Transform Infrared Spectroscopy (FTIR) and Thermogravimetric Analysis (TGA). It was shown that water presence in the ATF can increase the mean friction coefficient over a short time period, though in the long term perspective there is a higher loss of mean friction. Phase separation of the water-in-oil emulsion by centrifugation at 20000 rpm made it possible to examine the water phase using infrared 2spectroscopy. The spectroscopic analysis revealed the hydrophilic nature of certain ATF constituents, although the impact of water on the bulk properties like lubricant viscosity and thermal stability was insignificant. The analysis of the tribotests showed that the friction increase for water contamination was a short-term effect and likely due to the interaction between polar surface active additives and water. Even though no significant change has been found for thermal degradation or in bulk properties of the lubricant, the initially changed action of the water soluble additives and generation of high friction resulted in a total deterioration of the clutch performance during long term use.

Place, publisher, year, edition, pages
2015. Vol. 229, no 1, p. 74-85
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear) Chemical Process Engineering
Research subject
Machine Elements; Chemical Technology
Identifiers
URN: urn:nbn:se:ltu:diva-3400DOI: 10.1177/1350650114542477ISI: 000346255500005Scopus ID: 2-s2.0-84919343321Local ID: 139d32b2-daff-413c-be5d-f1c1a01df1d6OAI: oai:DiVA.org:ltu-3400DiVA, id: diva2:976258
Note
Validerad; 2014; Nivå 2; 20140619 (nowfat)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Fatima, NowshirHolmgren, AllanMarklund, PärMinami, IchiroLarsson, Roland

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Proceedings of the Institution of mechanical engineers. Part J, journal of engineering tribology
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)Chemical Process Engineering

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