Investigation of the tribological behavior of graphene oxide nanoplates as lubricant additives for ceramic/steel contact

• Published in: Tribology international 2018-12, Vol.128, p.113-120
• Main Authors: Wu, Lupeng, Xie, Zhijie, Gu, Le, Song, Baoyu, Wang, Liqin
• Format: Article
• Language: English
• Subjects: Additives; Bearing strength; Carbon; Energy dispersive X ray spectroscopy; Energy measurement; Friction; Friction reduction; Friction resistance; Graphene; Graphene oxide nanoplates; Load carrying capacity; Loads (forces); Lubricants; Lubricants & lubrication; Lubrication; Raman spectroscopy; Rubbing; Si3N4 ceramics; Tribology; Wear; Wear resistance
• ISSN: 0301-679X; 1879-2464
• DOI: 10.1016/j.triboint.2018.07.027

Effects of graphene oxide nanoplates (GOPs) as lubricant additives on tribological behavior of Si3N4 ceramic/GCr15 steel pairs were investigated, and especially focused on its effects under different rotational speeds and applied loads. Test results demonstrated that Load-carrying capacity, friction reduction and wear resistant were improved by 18.2%,14.7% and 34% with 0.5 wt% GOPs lubrication. Under all tested rotational speeds, GOPs enhanced friction reduction and wear resistance of sliding pairs. Compared to the low applied loads, the tribo-pairs exhibited better tribological properties under high applied loads. The rubbing surfaces were measured by Energy-Dispersive X-ray Spectroscopy and Raman Spectroscopy. The results illustrated that GOPs entered the contact interfaces to prevent tribo-pairs from direct contact, which reduced the materials transfer, friction and wear. •Effects of graphene oxide (GO) on tribological behavior of Si3N4/GCr15 pairs were studied.•Friction and wear were significantly improved by addition of GO.•Addition of GO enhanced the load-carrying capacity of base oil.•GO plays more significant role under heavy loads for Si3N4 /GCr15 tribo-pairs.•GO prevent the material transfer between tribo-pairs.