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Manufacture and Tribological Behavior of C/C-SiC Brake Composites Modified with Fe-Si Alloy
Y-H. Lu1, Z. Li1,2, W. Zhou1, P. Xiao1
1 State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, PR China
2 College of Metallurgical Engineering, Hunan University of Technology, Zhuzhou 412008, P R China
received October 20, 2016, received in revised form December 27, 2016, accepted February 17, 2017
Vol. 8, No. 2, Pages 213-222 DOI: 10.4416/JCST2016-00086
Abstract
To obtain a stable coefficient of friction (COF) for C/C-SiC composites at high brake speed, simultaneous infiltration of molten Si and Fe alloy into needled C/C materials was developed for fabricating C/C-SiC composites. Consequently, the effect of Fe-Si alloy on the mechanical properties and tribological behavior of C/C-SiC composites was investigated in this work. The results showed that the C/C-SiC composites were composed of C, SiC, FeSi and FeSi2, respectively. Furthermore, the SiC and Fe-Si alloy were mainly distributed in short woven web cloth and among fiber bundles. C/C-SiC composites modified with Fe-Si alloy exhibited lower compressive and flexural strength. Additionally, the brake curve was smoother, while the wear rate was higher. This indicates that introducing Fe-Si alloy into the matrix can impair the mechanical properties, and increase the wear rate, but also improve the friction curve. The typical brake curves were in the shape of a horse saddle.
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Keywords
C/C-SiC, friction, wear
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