Effect of Braking Speed on Friction Properties of C/C-SiC Composites

Friction properties of C/C-SiC composites,manufactured by warm compacted-in situ reacted process,were investigated with an inertial braking apparatus at different braking speeds.The worn surfaces and the wear debris were examined with SEM,and the wear debris were analyzed with XRD.The results show that,with the braking speed increasing,the frictional coefficient rise to the maximum of 0.46 at 10 m/s firstly and then fall,and at the same time the high frequent vibration begin to appear over 20 m/s;on the other hand,the wear debris are grind smaller and smaller,that lead to increase wear rates to the maximum of 8.75 μm at 28 m/s.This kind of C/C-SiC composites have better friction and wear properties on the energy condition of about 1.5 KJ/cm~2.