Abstract
In the present study, liquid polycarbosilane (LPCS) has been synthesized in the form of low viscous resin, by the heat-treatment of polydimethylsilane (PDMS) in an autoclave at 400°C for 5h. The spectral and thermal characterizations carried out at different processing stages indicate the formation of polycarbosilane with high Si–H content. LPCS gave ceramic residue of 34% at 900°C in argon atmosphere. XRD pattern of 1500°C heat-treated LPCS, indicates the formation of silicon carbide. LPCS was used as infiltrating resin for the preparation of C/C–SiC composite without any interfacial coating over the T-300 carbon fabric reinforcement. Flexural strength value of 64MPa for C/C–SiC specimen with density of 1.36g/cm3 was obtained after six infiltration and pyrolysis cycles. Fractured surface was characterized by SEM which indicates the formation of nano- to submicron wires in the pores of the hybrid composite.
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