Mitjan Kalin (Author), Maja Kus (Author)

Abstract

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.

Keywords

elastohydrodynamic (EHD);friction;additives;oleophobic layer;boundary slip;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
UDC: 539.92
COBISS: 30376451 Link will open in a new window
ISSN: 2223-7690
Views: 19
Downloads: 6
Average score: 0 (0 votes)
Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

Secondary language: Slovenian
Secondary keywords: elastohidrodinamični (EHD);trenje;aditivi;oleofobna plast;mejni zdrs;
Type (COBISS): Article
Pages: str. 1346-1360
Volume: ǂVol. ǂ9
Issue: ǂiss. ǂ6
Chronology: 2021
DOI: 10.1007/s40544-020-0403-2
ID: 16345588