抄録
Carbon-silica hybrid precursors for SiC with different carbon contents were prepared by firing hybrid gels consisting of crosslinked phenol resin and silica gel. The SiC precipitation processes in these precursors at 1873K were traced in terms of X-ray diffraction and scanning electron microscope (SEM) observation. Excess carbon in the system reduces the size of the formed SiC crystallite during the heat treatment. The precursor with high carbon content yielded aggregated grains consisting of small SiC crystallite, while the precursor with low carbon content yielded coarse isolated grains of 100-200nm after a long-term of heat treatment.
