Abstract
Si-Ti-C-O-fiber/SiO2-glass composite was prepared by oxidation of the fibers at ambient temperature and subsequent hot-pressing at 1750°C (50-70MPa). The matrix was built by a silica layer on the fiber surfaces formed during initial oxidation. High-resolution transmission electron microscopy (HRTEM) revealed the in-situ formation of a graphitic interface with both turbostratic and cellular configuration in addition to TiC crystallites, also precipitated within the silica matrix. Thermodynamic considerations indicate the possibility of active oxidation of SiC in the Tyranno fiber yielding gaseous silicon monoxide and solid carbon.
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