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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.

Summary

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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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 104 PROCEEDINGS OF THE SECOND INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE 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 doi:10.4203/ccp.104.313 purchase the full-text of this paper 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. Summary 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. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £65 +P&P)
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