Dual functions of TiC nanoparticles on tribological performance of Al/graphite composites

• Wear rate of Al/graphite composite decreased with the addition of TiC nanoparticles.
• TiC nanoparticles led to the formation of a stable graphite layer at long sliding distances.
• With the increase in sliding velocity, Al/TiC/graphite exhibited lower wear rate than Al/graphite composite.

In this study, the effect of TiC nanoparticles as a reinforcement on the mechanical and tribological properties of Aluminum-based self lubricating composite was investigated. The microstructure, relative density, hardness, and tribological properties of Al/graphite and Al/TiC/graphite composites were examined as a function of graphite content. The tribo-surfaces of the samples were analyzed using SEM and EDS elemental mapping. The results indicated that the addition of TiC nanoparticles not only decreased the wear rate and coefficient of friction of the composites, but also facilitated the formation of a stable graphite layer at longer sliding distances and high sliding velocities by forming a durable graphite/TiC composite on the tribo-surface. Therefore, the stability of graphite layer can be considered as a possible cause for decrease in wear rate of the Al/TiC/graphite composite.

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