空气氧化处理对三维编织炭复合材料性能的影响

A threedimensionally braided carbon fiber reinforced carbon/epoxy resin (C/Ep) composite was prepared by vacuum impregnation, and the effect of air oxidation of the fibers on the properties of the composite were investigated by SEM, nitrogen adsorption and mechanical testing. Results show that the specific surface area and surface roughness of the oxidized carbon fibers increase while their tensile strength decreases with increasing oxidation temperature or time. The flexural strength, flexural modulus, and shear strength of the C/Ep composites under the optimum treatment at 450℃ for 1h were increased by 149%, 91% and 29% respectively compared with the untreated samples, but the impact strength was decreased by 23%.