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Material Characterization and Influence of Sliding Speed and Pressure on Friction and Wear Behavior of Self-Lubricating Bearing Materials for Hydropower Applications
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0001-5080-0178
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0002-8533-897X
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0003-4582-0902
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-7395-3302
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2018 (English)In: Lubricants, ISSN 2075-4442, Vol. 6, no 2, article id 39Article in journal (Refereed) Published
Abstract [en]

Nowadays, hydropower plants are forced to have more frequent power control and the self-lubricated bearings used in the applications are one of the most critical components affected by the continuously changing operating conditions. In this study, microstructure and composition of two commercially available bearing materials (Orkot TXM Marine and Thordon ThorPlas) used in hydropower turbines were studied. In addition, the influence of sliding speed and applied pressure on the friction and wear behavior of the materials was investigated systematically for dry sliding conditions. The bearing materials were characterized using X-ray microtomography, Nuclear Magnetic Resonance (NMR) spectroscopy and Inductively Coupled Plasma–Sector Field Mass Spectrometry (ICP-SFMS) techniques. Friction and wear tests were carried out with a polymer pin sliding against a stainless steel (SS2333) plate with a linear reciprocating motion. Test conditions were: room temperature, 9–28 MPa pressure and 10–40 mm/s sliding speed ranges. Surface analysis of the polymer pins and the wear tracks were performed by optical profilometry, Scanning Electron Microscope (SEM) and Energy Dispersive Spectroscopy (EDS) techniques. Test results show that, for both materials, the coefficient of friction (COF) is decreasing at higher pressures. Surface analysis reveals higher concentrations of solid lubricants in the transfer layers formed at higher pressures, explaining the decrease in COF. Furthermore, the specific wear rate coefficients are increasing at higher sliding speeds, especially at lower pressures. Results of this study demonstrate that, under dry sliding conditions, changes in sliding speed and pressure have a significant influence on the tribological behavior of these bearing materials.

Place, publisher, year, edition, pages
Basel: MDPI AG , 2018. Vol. 6, no 2, article id 39
Keywords [en]
sliding wear, friction, oscillating motion, self-lubricating, polymer composites, solid lubricants, X-ray microtomography, hydropower
National Category
Composite Science and Engineering Tribology (Interacting Surfaces including Friction, Lubrication and Wear) Chemical Process Engineering Fluid Mechanics and Acoustics Physical Chemistry
Research subject
Machine Elements; Chemical Technology; Chemistry of Interfaces; Experimental Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-68558DOI: 10.3390/lubricants6020039Scopus ID: 2-s2.0-85047650891OAI: oai:DiVA.org:ltu-68558DiVA, id: diva2:1202807
Note

Validerad;2018;Nivå 2;2018-05-02 (andbra)

Available from: 2018-05-01 Created: 2018-05-01 Last updated: 2018-11-08Bibliographically approved

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