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Effect of multi-scale fillers on the tribological behavior of UHMWPE composites in water-lubricated contacts
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements. Laboratory for Tribology and Interface Nanotechnology, University of Ljubljana, Ljubljana, 1000, Slovenia.
Department of Surface Engineering, Jožef Stefan Institute, Ljubljana, 1000, Slovenia.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0001-8676-8819
Laboratory for Tribology and Interface Nanotechnology, University of Ljubljana, Ljubljana, 1000, Slovenia.
2024 (English)In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 196, article id 109669Article in journal (Refereed) Published
Abstract [en]

This study investigates the impact of graphite, hexagonal boron nitride and short carbon fibers, acting as micro- and nano-fillers, on the tribological performance of ultra-high-molecular-weight polyethylene (UHMWPE) hybrid composites. The tribological performance is evaluated under boundary-lubrication conditions with distilled water at contact pressures in the range from 5 and 15 MPa. The fillers were found to work synergistically, with the best performance recorded when the compositions incorporated fillers of all scales. The most effective composite, consisting of short carbon fibers, micro-scale graphite, micro-scale hBN and nano-scale hBN, reduced the coefficient of friction by 75 %, reaching a value of 0.06, and the specific wear rate by two orders of magnitude to 2 × 10−7 mm3/Nm, compared to pure UHMWPE. The fillers' size also played an important role. Composites with nano-boron nitride led to 40 % lower friction compared to micro-scale fillers only. However, all the fillers reduced the amount of abrasive wear, especially the boron nitride, as a consequence of the tribochemical reaction between the boron nitride and water at the interface. Additionally, the formation of a transfer film was observed on the steel discs, with only short carbon fibers and graphite contributing to its formation from among the fillers used.

Place, publisher, year, edition, pages
Elsevier, 2024. Vol. 196, article id 109669
Keywords [en]
Composite, Fillers, Multi-scale, Tribology, UHMWPE, Water
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-105383DOI: 10.1016/j.triboint.2024.109669Scopus ID: 2-s2.0-85191335760OAI: oai:DiVA.org:ltu-105383DiVA, id: diva2:1856674
Projects
GreenTRIBOS
Funder
EU, Horizon 2020, 860246
Note

Validerad;2024;Nivå 2;2024-05-07 (hanlid);

Funder: Slovenian Research and Innovation Agency (ARIS) (P2-0231);

Full text license: CC BY-NC-ND

Available from: 2024-05-07 Created: 2024-05-07 Last updated: 2024-05-07Bibliographically approved

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Gangwani, PrashantEmami, Nazanin

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