Journal
CERAMICS INTERNATIONAL
Volume 40, Issue 6, Pages 8265-8271Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2014.01.025
Keywords
Sol-gel; Supercritical drying; Silicon carbide; Carbothermal reduction; Microstructure
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Funding
- Priority Academic Program Development of Jiangsu Higher Education Institution (PAPD)
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1146]
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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 N-2 adsorption/desorption. The as-synthesized SiC aerogel presented typical mesoporous structure and possessed high porosity (91.8%), high surface area (328 m(2)/g) and large pore volume (2.28 cm(3)/g). Carbothermal reduction mechanism was also discussed based on the experiment and characterization results. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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