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Tribochemical wear of rail steels lubricated with synthetic ester-based model lubricants
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0003-1454-1118
2004 (English)In: Tribology letters, ISSN 1023-8883, E-ISSN 1573-2711, Vol. 17, no 3, p. 561-568Article in journal (Refereed) Published
Abstract [en]

Headchecks are a common type of damage in heavily loaded curved freight tracks. This paper deals with synthetic ester formulations' ability to prevent damage caused by headchecks through mild tribochemical wear. An experimental study pertaining to wear and friction of two rail steels lubricated by two synthetic ester base fluids, TMP-oleate and TMP-C8-C10, has been carried out. Six different free fatty acids were used in this study to act as performance additives. Three of the fatty acids were mono-acids with different, straight, carbon chain lengths (stearic acid C18, decanoic acid C10 and octanoic acid C8), one was a mono-unsaturated straight-chain fatty acid (oleic acid C18:1) while two were dibasic acids with intermediate carbon chain length (C9 and C10). Each fatty acid was blended with either ester, one at a time. The tests were carried out by using a high frequency reciprocating friction and wear test machine. In these tests, the gage face/wheel flange contact was simulated, and all tests were conducted in the boundary lubrication regime. An initial contact pressure of 316 MPa and a maximum sliding speed of 0.11 m/s were employed during the tests. The tests showed a wide range of wear rates, as well as different surface features depending on the interactions between synthetic esters, fatty acids and steel. The use of stearic and azaleic acid in lubricating rail steels results in very smooth surfaces with significant differences in their wear rates.

Place, publisher, year, edition, pages
2004. Vol. 17, no 3, p. 561-568
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-2820DOI: 10.1023/B:TRIL.0000044505.42373.0eISI: 000224427800025Scopus ID: 2-s2.0-5544303668Local ID: 08638c70-d585-11db-8550-000ea68e967bOAI: oai:DiVA.org:ltu-2820DiVA, id: diva2:975673
Note
Validerad; 2004; 20070318 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Waara, PatricNorrby, ThomasPrakash, Braham

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