New strategy for reducing the EHL friction in steel contacts using additive-formed oleophobic boundary films

Kalin, Mitjan (avtor), Kus, Maja (avtor)

In this study we present a mechanism for the elastohydrodynamic (EHD) friction reduction in steel/steel contacts, which occurs due to the formation of oleophobic surface boundary layers from common boundary-lubrication additives. Several simple organic additives (amine, alcohol, amide, and fatty acid) with different molecular structures were employed as the model additives. It was found that the stronger chemisorption at 100 °C, rather than the physisorption at 25 °C, is more effective in friction reduction, which reaches 22%. What is more, EHD friction reduction was obtained in steel/steel contacts without use of the diamond-like carbon (DLC) coatings with their wetting or thermal effect, which was previously suggested as possible EHD friction reduction mechanism; yet about the same friction reduction of about 20% was obtained here-but with much simpler and less expensive technology, namely with the adsorbed oleophobic surface layers. A small variation in the additive's molecular structure results in significant changes to the friction, indicating good potential in future EHD lubrication technology, where these additives could be designed and well optimised for notable reduction of the friction losses in the EHD regime.

• Jezik: Angleški jezik
• Ključne besede: elastohydrodynamic lubrication, friction, additives, oleophobic layer, boundary slip
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Datum objave: 15.05.2020
• Leto izida: 2021
• Št. strani: Str. 1346-1360
• Številčenje: Vol. 9, iss. 6
• PID: 20.500.12556/RUL-139398
• UDK: 539.92
• ISSN pri članku: 2223-7690
• DOI: 10.1007/s40544-020-0403-2
• COBISS.SI-ID: 30376451
• Datum objave v RUL: 02.09.2022

Gradivo je del revije

• Naslov: Friction
• Skrajšan naslov: Frict.
• Založnik: Tsinghua University Press
• ISSN: 2223-7690
• COBISS.SI-ID: 525351449

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
• Začetek licenciranja: 15.05.2020

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: elastohidrodinamično mazanje, trenje, aditivi, oleofobna plast, mejni zdrs

Projekti

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: P2-0231
• Naslov: Tribologija