Characteristics of wear surface morphology and wear mechanism of C/C composite with different matrix carbon

After the wear test with 40Cr steel coated by Cr,the morphology of the wear surface of six kinds of C/C composites with different matrix carbon were observed using JSM6360LV SEM apparatus.The results show that: the wear surface of the composite with smooth lamination(SL) structure is un-integrated under all the test loads;those of the composite with rough lamination(RL) structure or rough lamination /resin carbon(RL/RC) are thick and integrated under low load while those are the thin friction film under high load;that of the composite with RC is integrated under low load but it shows the flaking of massive friction films under high load;and the friction film of the RL/SL/RC and the SL/RC are thin under low load,and the worn degree of the matrix of the RL/SL/RC is more serious than that of the SL/RC under high load.The pyrocarbon of RL/SL or SL carbon shows the ladder wear morphology,and it can not distinguish the original ring shape of the RL carbon,but that of the RC shows the striation worn morphology. The wear surface of the composites with RL/SL/RC or SL/RC has high stability and wear-resistant ability,which can decrease the friction coefficient and bulk wear loss of the two kinds of composites under the test loads.