Graphene Oxide Nanosheets as Effective Friction Modifier for Oil Lubricant: Materials, Methods, and Tribological Results

Table 4

Wear scar diameter (WSD) after a 1-hour boundary and a mixed regime test at 80°C.

	Average hertzian contact pressure 1.68 GPa, oil temperature 80°C
Sample	Ball wear scar diameter (𝜇m) at 5.0 mm/s sliding speed	Ball wear scar diameter (𝜇m) at 0.50 m/s sliding speed	Difference
	Boundary regime	Mixed regime
SN150—base oil			Benchmark
SN150 with 0.1 wt% GO		Pictures not to scale	−13% −27%