ChemInform Abstract: Synthesis of Nanocrystalline Silicon Carbide Powder by Carbothermal Reduction.

Abstract

Synthesis of Nanocrystalline Silicon Carbide Powder by Carbothermal Reduction.-A solution of sugar in silica sol is used as parent material for the manufacture of nanocrystalline SiC powders. The conversion is performed in two steps. First the sugar is converted to carbon particles and secondly the silica carbon mixture is heated up to the approved reaction temp. between 1550 and 1800 • C under an Ar pressure of 180 kPa. The oxygen content of the powder is ¡ 0.5 wt.% and the particles are ¡0.5 µm with crystallites ¡100 nm and specific surface areas in the range of 20-30 m 2 /g. -(MARTIN, H.-P.; ECKE, R.; MUELLER, E.; J.

In situ synthesis of SiC nanowire porous layer on carbon/carbon composites

“…[39][40][41][42][43][44][45] The former generally involves catalyst while the latter one does not. SiCNWs were synthesized by the carbothermal reduction reaction of SiO 2 according to the overall reaction as follows 47,48 : In a typical VS growth process, the Si-and C-containing gaseous precursors react on solid surface to form SiC nuclei.…”

“…And Si powders were beneficial to produce the nanowire porous layer as an accelerant at 1500°C, graphitic powders were acted as the C source. SiCNWs were synthesized by the carbothermal reduction reaction of SiO 2 according to the overall reaction as follows 47,48 :…”