Friction and Wear Behaviour of Brake Pads Dry Sliding Against Semi-Interpenetrating Network Ceramics/Al-alloy Composites |
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Authors: | Shao Yang Zhang Yuan Yuan Li Sheng Guan Qu Wei Ping Chen |
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Affiliation: | (1) National Engineering Research Center of Near-net-shape Forming for Metallic Materials, School of Mechanical and Automotive Engineering, South China University of Technology, No. 381, Wushan Road, Tianhe District, 510640 Guangzhou, People’s Republic of China |
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Abstract: | Semi-interpenetrating network composites containing 40 vol.% ceramics (5Al2O3·8SiO2) and 60 vol.% Al-alloy were fabricated in place of cast iron available for automotive brake rotors. The friction and wear
performances of brake pads dry sliding against the composites were measured using a SRV testing machine. The test procedures
include friction fade and recovery, load sensitivity at 100 and 250°C, and wear. The friction was found to increase first
and then decrease with increasing temperature, followed by the inverse recovery upon cooling. Wear showed an incremental tendency
over a wide temperature range. For loads from 40 to 160 N, the friction decreased at 100 and 250°C. At load below 128 N, the
former friction was inferior to the latter while at load above 128 N the friction exhibited an inverse tendency. Wear mildly
increased with load at 100 °C and decreased dramatically at 250 °C. SEM and EDS investigations revealed that the worn pad
surfaces at 250 °C were covered by more tribofilms, including more coke and graphite with friction-reducing action as well
as fewer compounds (corresponding to Si and Al) with friction-increasing action in comparison with those at 100 °C. The compression
of the tribofilms contributed to a large decrease in the friction and wear with increasing load. However, at 100 °C E-glass
fibers exposed at the worn surfaces inhibited the excessive wear of the pad despite lack of more tribofilms. Their glossy
surfaces decreased the friction. The proposed friction models explain some friction and wear behaviour better. |
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