The Effective Role Played by Graphene Fillers for Improving the Tribological Properties of Ceramics
Nowadays, new materials with enhanced tribological properties are required to fulfil the new demanding working conditions of more efficient and eco-friendly industrial processes. To achieve this goal, we propose the addition of graphene nanofillers, a very attractive self-lubricating solid, to ceramic materials for improving their tribological responses. As proof of concept, here we present the role of the graphene nanoplatelets (GNPs) on the friction and wear resistance of two different graphene/ceramic nanocomposites, in particular, GNPs/silicon nitride and GNPs/silicon carbide materials. The tribological tests evidence that GNPs are ideal nanofillers to increase the wear resistance, especially under high contact pressures, because the nanoplatelets are exfoliated during the sliding motion and lead to the formation of a carbon-based protecting film; whereas the benefits on the friction depend on the tribo-testing conditions.
Keyword(s): graphene, ceramic matrix nanocomposites, wear, friction.
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