Abstract
Graduate School of Railroad, Seoul National University of Science and Technology(Received September 22, 2014; Revised November 10, 2014; Accepted November 17, 2014)Abstract − Sintered metallic brake pads and low alloy heat resistance steel disks are applied to mechanical brake sys-tems in high energy moving machines that are associated with recently developed 200km/h trains. This has ledto the speed-up of conventional urban rapid transit. In this study, we use a lab-scale dynamometer to investigatethe effects of the composition of friction materials on the tribological characteristics of sintered metallic brakepads and low alloy heat resistance steel under dry sliding conditions. We conduct test under a continuous pressureof 5.5 MPa at various speeds. To determine the optimal composition of friction materials for 200 km/h train, wetest and the evaluate frictional characteristics such as friction coefficients, friction stability, wear rate, and thetemperature of friction material, which depend on the relative composition of the Cu-Sn and Fe components. Theresults clearly demonstrate that the average friction coefficient is lower for all speed conditions, when a largequantity of iron power is added. The specimen of 25 wt% iron powder that was added decreased the wear ofthe friction materials and the roughness of the disc surface. However when 35 wt% iron powder was added, thedisc roughness and the wear rate of friction materials increased By increasing the amount of iron powder, thesurface roughness, and temperature of the friction materials increased, so the average friction coefficientsdecreased. An oxidation layer of Fe
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