|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Surface Engineering IV
||NOW ON-DEMAND ONLY - Evolution of Friction and Shear Deformation Induced Mixing of Graphene on Copper Substrate
||Mayur Pole, Shuang Li, Kate Whalen, Aditya Nittala, Jinhui Tao, Bharat Gwalani, Keerti Kappagantula
|On-Site Speaker (Planned)
Atomically thin graphene offers unusually high strength and lubricity.
However, despite of its superior properties, graphene often gets worn out in macroscale tribological tests resulting in a highly refined tribo-layer. To evaluate the impact of graphene layering on copper substrate on lubricating performance upon sliding and shear induced mixing, we performed tribological experiments on mono and tri-layered graphene manufactured by chemical vapor deposition on copper foil. A sharp increase in the coefficient of friction (COF) attributed to rupture and smearing of graphene layer into copper substrate was seen. The COF of the copper/graphene samples remained lower than that of pure copper, suggesting that partially worn graphene can remain effectively lubricious at the macroscale. A multimodal characterization of the tribo-layer revealed a shear deformation-induced ultrafine two-phase grain-structure consisting of copper and graphitic domains. This study provides new insights on macroscale structure-property correlation of copper-graphene composites, with widespread structural and functional applications.
||Process Technology, Surface Modification and Coatings, Characterization