Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1461575 | Ceramics International | 2014 | 7 Pages |
Resorcinol–formaldehyde/silica composite (RF/SiO2) aerogel was synthesized by sol–gel process followed by supercritical drying (SCD). Monolithic SiC aerogel was obtained from RF/SiO2 aerogel after carbothermal reduction. The evolution of physical property, crystal structure, morphology and pore structure from RF/SiO2 to SiC aerogel was investigated by different methods, such as X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and N2 adsorption/desorption. The as-synthesized SiC aerogel presented typical mesoporous structure and possessed high porosity (91.8%), high surface area (328 m2/g) and large pore volume (2.28 cm3/g). Carbothermal reduction mechanism was also discussed based on the experiment and characterization results.