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Tensile properties and fracture morphologies of C/C composites used as aircraft brake disc at different heat treatment temperature have been studied. Fracture morphologies characteristics of tensile sample were observed with scanning electron microscope (SEM), and fracture mechanism was analyzed. The test results show that, with increase of heat treatment temperature, tensile strength of C/C composites has a descend trend, whereas, breaking strain has an upward trend, and failure mode changes from brittle fracture into “pseudo-plasticity” fracture. Destructional form includes interface debonding, extraction, break and matrix damage and so on, among which interfacial failure is principal fracture mechanism.

C/C composites have the phenomenon of the decrease of friction coefficient in wet conditions, companied with the change of wear behavior. In this paper, the effect of micro-tissue and density on the tribology behavior of C/C composites in wet conditions has been studied. The results indicate that all the above factors influence the tribology behavior of C/C composites at a different degree. It is believed that all the above factors change the ability of absorbing water by the C/C composites. The different degree of water absorption in turn changes the tribology mechanisms of C/C composites resulting in the change of tribology behavior of the C/C composites.