2009•The Chinese Journal of Nonferrous MetalsRequires access
Tribological behaviour and mechanism of C/C-SiC-Fe composites at different braking speeds
Meirong Fu
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Abstract
C/C performs were prepared by densification of needled carbon fiber felts with CVD. The C/C-SiC-Fe braking composites were manufactured by infiltration of moltening Si and Fe into the obtained C/C performs. The tribological characteristics of C/C-SiC-Fe composites at different braking speeds were investigated. The worn surfaces of C/C-SiC-Fe and the wear debris were examined by SEM. The results show the brake of C/C-SiC-Fe composites at high speed is stable. The coefficient of friction rises to the maximum of 0.53 at braking speed of 12 m/s firstly and then falls with increasing braking speed. The wear rates have similar change at the beginning but increase rapidly to the maximum of 3.3× 10-8cm3/(N·m) at braking speed of 24 m/s. The wear mechanism changes from abrasion, adhesion to fatigue and oxidation with increasing braking speed.