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SbstractThis research is focused on the effect of porosity on the friction-wear properties of automotive brake pads. Waste Tire Dust (WTD) was used as a new friction material in brake pads. Newly formulated brake pad materials with five different components have been produced by conventional techniques. In the experimental studies, the change of the friction coefficient, the temperature of the friction surface, the specific wear rate, and the hardness, density and porosity were measured. In addition, the micro-structural characterizations of brake pads are determined using Scanning Electron Microscopy (SEM). The mean coefficient of friction, porosity and specific wear are increased due to a WTD rate increases, on the other hand, hardness and density are decreased. As a result, WTD can be considered as an alternative to revalorize this kind of waste products in the brake pads and the amount of porosity of the brake pad affected the friction coefficient and wear behavior of the pad.

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In this study, the effects of tall oil biodiesel with cobalt (Co)-based additive on engine performance and exhaust emissions have been experimentally investigated. Co-based additive at the rate of 4, 8, and 12 mol/l was added to mixtures of 60% tall oil methyl ester and 40% diesel fuel (T60). The engine tests were performed at full load condition in a single-cylinder diesel engine. Biodiesel fuels had no noteworthy influence on engine torque and the power output values. Catalyst effects of Cobased additive improved specific fuel consumption values, CO emissions, and smoke emissions. On the other hand, higher NO x emissions were measured at low engine speed.