Abstract
Al based metal matrix composites offer higher specific strength, light weight along with enhanced wear resistance and lower coefficient of friction. In the present investigation, aluminium alloy hybrid composites containing 3 weight % graphite(size less than one micron) and 3%, 6% and 9 wt % tungsten carbide powder(size less than one micron) were produced by stir casting. Addition of tungsten carbide (WC) increases strength and wear resistance of composites, while graphite (Gr) reduces the coefficient of friction, thus improving the overall tribological characteristics. Composite specimens were tested at loads of 10N, 15N and 20N with the sliding speeds of 1m/s, 1.5m/s and 2m/s to evaluate their wear behaviour. Co efficient of friction was also analysed. As the applied load increased, the coefficient of friction and wear rate of the composite increased. Coefficient of friction showed a decrease with increasing sliding speed and reinforcement content. Hardness of the composite increased with an increase in WC content.
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