| Updated in 1/13/2017 12:14:30 AM |
Viewed: 553 times |
(Journal Article) |
Journal of Dispersion Science and Technology: null-null (2016)
Tribological Properties of Graphene Nanosheets as an Additive in Calcium Grease
Bahaa M Kamel
,
Alaa Mohamed
,
M El Sherbiny
,
K A Abed
,
M Abd-Rabou
ABSTRACT
AbstractThe addition of graphene nanosheets in lubricating grease could significantly reduce the interfacial friction and improve the load-bearing capacity of the parts. Therefore it has been considered as having great potential as lubricant additives. In this study, we synthesis graphene nanosheets (GNS) which are prepared by a modified Hummer method, and investigated the effect of GNS with different concentration (0.5%, 1%, 2%, 3%, and 4%wt.) on the tribological properties of the calcium grease. The friction and wear experiments were performed using a four ball tribometer. Transmission Electron Microscopy (TEM) and Scanning electron microscopy (SEM) were employed to examine the GNS and the friction mechanisms. Results indicate that the friction reduction ability and anti-wear property of the base grease can be improved with the addition of GNS. It was also found that the friction reduction decrease by 61%, and the wear scar diameter (WSD) decreases by 45%, and the extreme pressure (EP) properties increased 60% at 3% wt GNS. It's clearly; the GNS in grease easily form protective deposited films to prevent the rubbing surfaces from coming into direct contact and, thereby, improve the entire tribological behavior of the grease.
Notes
doi: 10.1080/01932691.2016.1257390