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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 104
Edited by: J. Pombo
Paper 313

Frictional Performance and Friction Film Evolution of Cu based Braking Materials

Y. Wang, Q.Z. Yan, Z.Y. Fan, X. Wen and C.C. Ge

Laboratory of Special Ceramics and Powder Metallurgy, University of Science and Technology Beijing, China

Full Bibliographic Reference for this paper
Y. Wang, Q.Z. Yan, Z.Y. Fan, X. Wen, C.C. Ge, "Frictional Performance and Friction Film Evolution of Cu based Braking Materials", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 313, 2014. doi:10.4203/ccp.104.313
Keywords: brake materials, Al2O3/Cu composite, inertial friction test, friction performance, friction evolution, delamination structure.

The mechanical properties, frictional performances, and friction film evolution of Al2O3 enhanced copper-based braking materials was investigated. The samples of copper-based composites reinforced with Al2O3 or not were fabricated by powder metallurgy procedures. The density, porosity, hardness and compression strength were examined. The friction performances of samples were conducted under braking speeds of 160-320 Km/h in dry air environment using an MM1000-II inertial friction test machine. For pure copper-based sample (CU), the coefficient of friction (CF) decreased from 0.302 to 0.226 as braking speed increased, while the CF of Al2O3/Cu-based sample (AC) stabilized about 0.301. Microstructure observations were investigated by scanning electron microscopy (SEM) for cross-section and surface of friction layer. It can be concluded that the key distinction between the stable friction and fading friction appears to lie in the friction film evolution which is affected by the strengthening of Al2O3 particles.

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