Tribological Characteristics of Aqueous Graphene Oxide,Graphitic Carbon Nitride,and Their Mixed Suspensions |
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| Authors: | Anshun He Shuiquan Huang Jung-Ho Yun Zhengyi Jiang Jason R. Stokes Sihai Jiao Lianzhou Wang Han Huang |
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| Affiliation: | 1.School of Mechanical and Mining Engineering,The University of Queensland,St Lucia,Australia;2.School of Chemical Engineering,The University of Queensland,St Lucia,Australia;3.School of Mechanical, Materials and Mechatronic Engineering,University of Wollongong,Wollongong,Australia;4.Research Institute (R&D Center),Baoshan Iron & Steel Co., Ltd.,Shanghai,China |
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| 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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