Tribological performance of Graphene/Carbon nanotube hybrid reinforced Al2O3 composites

Abstract

Tribological performance of the hot-pressed pure Al2O3 and its composites containing various hybrid contents of graphene nanoplatelets (GNPs) and carbon nanotubes (CNTs) were investigated under different loading conditions using the ball-on-disc method. Benchmarked against the pure Al2O3, the composite reinforced with a 0.5 wt% GNP exhibited a 23% reduction in the friction coefficient along with a promising 70% wear rate reduction, and a hybrid reinforcement consisting of 0.3 wt.% GNPs + 1 wt.% CNTs resulted in even better performance, with a 86% reduction in the wear rate. The extent of damage to the reinforcement phases caused during wear was studied using Raman spectroscopy. The wear mechanisms for the composites were analysed based on the mechanical properties, brittleness index and microstructural characterizations. The excellent coordination between GNPs and CNTs contributed to the excellent wear resistance property in the hybrid GNT-reinforced composites. GNPs played the important role in the formation of a tribofilm on the worn surface by exfoliation; whereas CNTs contributed to the improvement in fracture toughness and prevented the grains from being pulled out during the tribological test.

An investigation into the tribological properties of wood flour reinforced polypropylene composites

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Effect of crystal plane orientation on tribochemical removal of monocrystalline silicon

“…Generally, the wear of Si/Diamond pair is dominated by mechanical wear, which is governed by the processes of deformation and fracture. Therefore, such wear behavior is strongly associated with surface mechanical properties2930. Table 1 shows that the mechanical properties (hardness, elastic modulus) for the three crystal planes can be ranked by: Si(111) > Si(110) > Si(100)2429.…”

Suspension High Velocity Oxy-Fuel (SHVOF)-Sprayed Alumina Coatings: Microstructure, Nanoindentation and Wear

“…A load of 10 N, stroke length of 5 mm and sliding speed of 10 mm/s were used. In a previous publication, it was reported that the above loading conditions can produce suitable wear tracks in bulk alumina [17]. Wear tracks were measured using a Talysurf Form 50 contact profilometer (Taylor-Hobson, UK), with a lateral resolution of 0.5 µm.…”