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

Povzetek

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.

Ključne besede

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

Podatki

Jezik:	Angleški jezik
Leto izida:	2021
Tipologija:	1.01 - Izvirni znanstveni članek
Organizacija:	UL FS - Fakulteta za strojništvo
UDK:	539.92
COBISS:	30376451
ISSN:	2223-7690
Št. ogledov:	19
Št. prenosov:	6
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Slovenski jezik
Sekundarne ključne besede:	elastohidrodinamični (EHD);trenje;aditivi;oleofobna plast;mejni zdrs;
Vrsta dela (COBISS):	Članek v reviji
Strani:	str. 1346-1360
Letnik:	ǂVol. ǂ9
Zvezek:	ǂiss. ǂ6
Čas izdaje:	2021
DOI:	10.1007/s40544-020-0403-2
ID:	16345588