Tribological and tensile behaviour of Si3N4 reinforced Cu-Sn matrix composites

In the present research, Cu-Sn alloy with 7.5 wt. % of Si₃N₄ particles reinforced composites were fabricated by using conventional stir casting method. As-cast Cu-8 %Sn alloy and Cu-8 %Sn alloy with 7.5 wt. % of Si₃N₄ reinforced composites were evaluated for microstructural studies using SEM and EDS, density, tensile properties and wear behaviour as per ASTM method. Cu-Sn alloy with 7.5 wt. % of silicon nitride particles reinforced composites shown lesser densities as compared to the base Cu-Sn alloy. Further, these composites were exhibited superior tensile strength with slight reduction in the ductility. Pin on disc wear apparatus was used to conduct the wear tests at varying loads and speeds. The wear resistance of Cu-Sn alloy increased with the incorporation of Si₃N₄ particles. Further, applied load and speeds were impacted in the wear behaviour of Cu-Sn alloy composites. As load and speed increased, there was more material loss in as-cast alloy and its composites. Tensile fractured surfaces indicated various fracture modes in Cu-Sn alloy and composites.