Alkyl Titanate-Modified Graphene Oxide as Friction and Wear Reduction Additives in PAO Oil

Abstract

Diacetoxy-stearoyloxy-titanium-modified graphene oxide (Titanate-GO) was successfully prepared using titanium tetraisopropanolate, stearic acid, acetic acid, and graphene oxide (GO). The morphology and structure of the as-prepared materials were tested by FT-IR, Raman, TG/ DSC, SEM, and TEM instruments. The results indicate that long alkyl titanium chains have been grafted on the surface of a GO sheet, which guaranteed the dispersibility of Titanate-GO in PAO10 base oil. Then, the lubrication properties of Titanate-GO as a lubricating additive in PAO10 base oil were evaluated on a four-ball machine. The results show that the average coefficient of friction and wear scar diameter were reduced by 49.5 and 28.2%, respectively, compared with bare PAO10 base oil. Finally, the lubrication mechanism was discussed based on the Raman analysis, which was carried out on the worn surface of the steel ball.

Low Friction of Graphene Oxide Aggregates in Lubricant Oil between a Steel Ball and Glass Disk under Boundary Lubrication

“…Many researchers have investigated the tribological properties of graphene oxide (GOs) as additives in water and lubrication oil. − Although the size of the GO can exceed 10 μm, its thickness is less than 1 nm. Thus, it is considered to enter narrow friction interfaces under boundary lubrication.…”

Water‐based Cu nanofluid as lubricant for steel hot rolling: Experimental investigation and molecular dynamics simulation

“…1 In recent years, with the development of nanotechnology, nanofluids containing nanoparticles in the size of 1-100 nm have attracted increasing attention as lubricants for metal-forming, such as TiO 2 , 2 CuO, 3 MoS 2 , 4 SiO 2 , 5 and graphene oxide. 6 These nanoparticles exhibit superior frictionreduction and anti-wear performance in water-based fluids. Besides, water-based nanofluids have excellent colling performance and low pollution compared to oilbased lubricants, 7 which are of great prospect as environmental-friendly lubricants for hot rolling lubrication.…”

“…However, friction and wear are inevitable during hot rolling process, which will seriously impact the metal surface quality, increase energy consumption and material wastage 1 . In recent years, with the development of nanotechnology, nanofluids containing nanoparticles in the size of 1–100 nm have attracted increasing attention as lubricants for metal‐forming, such as TiO 2 , 2 CuO, 3 MoS 2 , 4 SiO 2 , 5 and graphene oxide 6 . These nanoparticles exhibit superior friction‐reduction and anti‐wear performance in water‐based fluids.…”

Tribological Performance Studies of Waterborne Polyurethane Coatings with Aligned Modified Graphene Oxide@Fe3O4

“…With its extremely low coefficient of friction, atomic smooth surface, and low interlayer shear resistance, graphene has attracted considerable attention of many scholars in the field of lubrication, − especially as a nanoadditive to improve the tribological properties of polymers. , Since graphene is extremely easy to agglomerate and difficult to disperse in most solvents, surface modification of graphene by chemical modification is crucial to improve the dispersion and stability of graphene in the polymer matrix. − Mo et al used KH550 to modify GO to obtain functionalized GO (FGO) with good dispersibility and compatibility in the polyurethane matrix. The results showed that the friction and corrosion resistance of the composite coating with 0.25–0.5% FGO are the best …”