Abstract: C/ C2 Cu composites were fabricated by molten Cu alloy infilt ration into C/ C preforms prepared by chemical vapor infilt ration or impregnation/ carbonization. The t ribological behavior of the composite block with the Cu ring counterpart was evaluated using an MM22000 f riction and wear tester. The worn surface morphologies of
the composite blocks and the Cu rings were analyzed by means of scanning elect ron microscopy. The influence of the C/ C preform on the t ribological behavior of the composites was investigated. The result s show that the f riction coefficient , wear rate of the composites and the mass loss of Cu rings decrease with the increasing of density of the preforms ; the f riction coefficient and wear rate of the composite with impregnation/ carbonization preform is higher than those with chemical vapor infilt ration preform; the wear rate of the composites with parallel orientation is higher than that with vertical orientation , while the formers riction coefficient is lower .