Abstract
The tribological performance of graphene oxide (GO), graphitic carbon nitride (g-C3N4), and their mixed (g-C3N4/GO) aqueous suspensions was investigated. The 0.06 wt% GO, 0.06 wt% g-C3N4, and 0.06 wt% 1:1 g-C3N4/GO suspensions reduced the coefficient of friction (COF) by 37, 26 and 37% and wear mark radius by 19.1, 16.0 and 19.6%, respectively, in comparison with water. Pure g-C3N4 and GO suspensions showed unstable lubrication in the tests with relatively high loads and speeds, while the g-C3N4/GO mixed suspension had superior tribological performance in all tested conditions. This is because in the mixed suspension g-C3N4 agglomerates became smaller, and GO nanosheets exhibited fewer wrinkles and less stacking, which enabled the formation of a layer of tribo-composite film. As a result, the friction, wear and tribo-corrosion were reduced during sliding.
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