The subject of the present study was the fibrous ceramic matrix composite Cf - SiC with nanostructured reinforcement/matrix interface.

Nanostructured barrier layer on the fibers was obtained during heat pretreatment of the applied polymer binder coating with particulate filling. Ceramic SiC matrix was formed though chemical interaction of the molten Si with C in the prepreg during liquid silicon infiltration of the carbon fiber preforms.

Structure of the fiber/matrix interface was characterized in detail by scanning electron microscopy.

The protective effects of the barrier coating on carbon fiber were tested against Si vapors and molten Si, as encountered during siliconizing process.

The effects of the phase composition and structure of the barrier coating on composite strength (flexural and impact) and fracture behaviour were analyzed.

Correlations between the organization of the nanostructured interphase and micromechanics behaviour of the stressed composite were studied.

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