TY - GEN
T1 - Fabrication of silicon-based ceramic synthesized from mesoporous carbon-silica nanocomposites
AU - Wang, Kun
AU - Cheng, Yi Bing
AU - Wang, Huanting
PY - 2009
Y1 - 2009
N2 - Mesoporous carbon-silica (C-SiO2) nanocomposites with different C/SiO2 molar ratios were used as precursor for fabricating silicon-based ceramics. Different silicon carbide nanostructures were synthesized by carbothermal reduction of mesoporous C-SiO2 nanocomposites via different heat treatments under argon. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption-desorption analysis were used to characterize C-SiO2 nanocomposites and SiC products. The major morphologies formed from the mesoporous C-SiO2 nanocomposites were nanoparticles and nanofibers. With higher quantity of P123, which is the surfactant for the mesopores, the BET surface area and pore volume increased, inducing a decrease of nanofibers. The mesoporous precursors were also heated at 1200 °C for 15 hours to make a nearly dense structure and then heated to the final temperature. The products were almost nanoparticles which had a larger size than those heated directly to 1450 °C. Therefore carbothermal reduction of mesoporous C-SiO2 precursors appears to be an effective means of accelerating the reaction and controlling SiC nanostructures.
AB - Mesoporous carbon-silica (C-SiO2) nanocomposites with different C/SiO2 molar ratios were used as precursor for fabricating silicon-based ceramics. Different silicon carbide nanostructures were synthesized by carbothermal reduction of mesoporous C-SiO2 nanocomposites via different heat treatments under argon. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption-desorption analysis were used to characterize C-SiO2 nanocomposites and SiC products. The major morphologies formed from the mesoporous C-SiO2 nanocomposites were nanoparticles and nanofibers. With higher quantity of P123, which is the surfactant for the mesopores, the BET surface area and pore volume increased, inducing a decrease of nanofibers. The mesoporous precursors were also heated at 1200 °C for 15 hours to make a nearly dense structure and then heated to the final temperature. The products were almost nanoparticles which had a larger size than those heated directly to 1450 °C. Therefore carbothermal reduction of mesoporous C-SiO2 precursors appears to be an effective means of accelerating the reaction and controlling SiC nanostructures.
UR - http://www.scopus.com/inward/record.url?scp=70449858009&partnerID=8YFLogxK
M3 - Conference Paper
AN - SCOPUS:70449858009
SN - 9780470408469
VL - 208
T3 - Ceramic Transactions
SP - 71
EP - 78
BT - Processing of Nanoparticle Structures and Composites - A Collection of Papers Presented at the 2008 Materials Science and Technology conference, MS and T08
T2 - Processing of Nanoparticle Structures and Composites - 2008 Materials Science and Technology conference, MS and T08
Y2 - 5 October 2008 through 9 October 2008
ER -