Investigation on the tribological properties of copper alloy reinforced with Gr/Zro2 particulates by stir casting route

Abstract

The combination of Graphite (Gr) and Nano Zirconium Oxide (ZrO2) is found efficient in reinforcing copper matrix composites (CMC) for bearing application due to its intrinsic ultrahigh tribological and mechanical properties. In this study the wear properties of copper alloy (90% Cu and 10% Sn) composites were compared with Cu alloy + 4 wt% Gr, Cu alloy + 4 wt. %ZrO2 and Cu alloy + 4wt. %Gr + 4 wt% ZrO2. In the present investigation the fabrication of CMC composites were made through stir casting process. The Microstructural characterization was carried with Scanning Electron microscopy (SEM) and Electron Displacement Spectrum (EDS) to show uniform distribution of reinforcement particles in the matrix and also to confirm the elements. The wear behavior were evaluated at varying loads of1, 2 and 3 kg with a constant speed of 300 rpm and for varying sliding speeds of 100, 200 and 300 rpm and constant load of 3 kg using a pin on disc apparatus. After test on wear machine it was found that Cu alloy with graphite and ZrO2 composites at varying loads and varying speeds exhibits the superior wear resistance. These composites are best suited for bearing applications.