Combined Effect of Textured Patterns and Graphene Flake Additives on Tribological Behavior under Boundary Lubrication
Fig 4
Optical images of GP dispersion in base oil (a) upon addition, (b) after three days, and (c) after nine days(I: PAO4 + 0.05% GP, II: PAO4 + 0.05% GP + 1% SP, III: PAO4 + 0.01% GP, IV: PAO4 + 0.01% GP + 1% SP, and V: PAO4.)