Effect of multi-scale fillers on the tribological behavior of UHMWPE composites in water-lubricated contacts

Gangwani, Prashant (avtor), Kovač, Janez (avtor), Emami, Nazanin (avtor), Kalin, Mitjan (avtor)

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$^{−7}$ mm$^3$/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.

• Jezik: Angleški jezik
• Ključne besede: multi-scale, fillers, UHMWPE, composites, water, tribology
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2024
• Št. strani: 18 str.
• Številčenje: Vol. 196, art. 109669
• PID: 20.500.12556/RUL-156365
• UDK: 539.92
• ISSN pri članku: 0301-679X
• DOI: 10.1016/j.triboint.2024.109669
• COBISS.SI-ID: 196211459
• Datum objave v RUL: 22.05.2024

Gradivo je del revije

• Naslov: Tribology international
• Skrajšan naslov: Tribol. int.
• Založnik: Elsevier
• ISSN: 0301-679X
• COBISS.SI-ID: 26558976

Licence

• Licenca: CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
• Opis: Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: večplastnost, polnila, UHMWPE, kompoziti, voda, tribologija

Projekti

• Financer: EC - European Commission
• Program financ.: H2020
• Številka projekta: 860246
• Naslov: GreenTRIBOS
• Akronim: GreenTRIBOS

• Financer: ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
• Številka projekta: P2-0231
• Naslov: Tribologija