철도차량용 금속계 소결마찰재의 조성에 따른 트라이볼로지 특성
Effects of Composition of Metallic Friction Materials on Tribological Characteristics on Sintered Metallic Brake Pads and Low-Alloy Heat-Resistance Steel for Trains
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Sintered metallic brake pads and low alloy heat resistance steel disks are applied to mechanical brake systemsin 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 Fe2O3 was formed on both friction surfaces.
Abstract
Sintered metallic brake pads and low alloy heat resistance steel disks are applied to mechanical brake systemsin 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 Fe2O3 was formed on both friction surfaces.
참고문헌 (6)
- 김상호, "Effect of Pressure on Tribological Characteristics between Sintered Friction Materials and Steel Disk", International Journal of Precision Engineering and Manufacturing, 12(4), pp.643~650 (2011), 한국정밀공학회
- Kim, S. H, "Tribological Characteristics of Brake Disc for Train", J. Korean Soc. Tribol. Lubr. Eng, 23(1), pp.19~28 (2007)
- Amderson, A. E, "ASM Handbook, Vol. 18", pp.569~577 (1992), ASM International
- Jacko, M. G, "Kirk-Othmer Encyclopedia of Chemical Technology", pp.523~536 (1992), Wiley
- Quinn, T. F. J, "Review of Oxidational Wear. Part 1: The Origins of Oxidational Wear", Tribo. Int, 16, pp.257~270 (1983)
- Iwabuchi, A, "The Role of Oxide Particles in the Fretting Wear of Mild Steel", Wear, 151, pp.301~311 (1991)