Abstract
High-porous SiC ceramics (density 0.50–0.58 g/cm3, porosity 82–84 %, compressive stress at break 3.7–6.3 MPa) was prepared by means of polymeric technology and natural raw material (diatomite powder, “Biosilica” grade) at the temperature of carbothermal synthesis (1400 °C). It was shown that the main phase was silicon carbide with a small (<5 %) impurity of FeSi; SiC crystallite size was found to be 23–30 nm. Using scanning electron microscopy, X-ray computerized microtomography, and dynamic light scattering in aqueous suspensions of powders obtained at ultrasonic exposure, it was shown that SiC nanoparticles in the samples were aggregated to a great extent. The degree of aggregation strongly depends on SiO2-C ratio in the starting samples.
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