In the present study, wear and friction coefficients of different material pairs, such as aluminium, brass, copper and steel, are investigated and compared experimentally. In order to do so, a pin-on-disc apparatus is used. Experiments are carried out when different types of pin such as aluminium, brass, copper and mild steel slide on different disc materials such as aluminium, brass, copper and mild steel. Experiments are conducted at normal load of 5, 10, 15 and 20 N, sliding velocity 1 m/s and relative humidity 70%. Variations of wear and friction coefficient at different normal load are investigated. Results show that wear and friction coefficient varies with normal load. The obtained results reveal that friction coefficient increases with the increase in normal load for most of the tested pairs and decreases for others. The magnitudes of friction coefficient are different for different material pairs depending on normal load. Moreover, the wear increases with the increase in normal load for all the tested pairs. Keywords: Friction coefficient, wear, normal load, aluminium, brass, copper, mild steel
