Influences of Catalyst Amount in Xerogels Precursors on the Structure and Property of Silicon Carbide with Taixi Coal as Carbon Source

A simple and cost effective method was reported for the synthesis of silicon carbide by the sol-gel and carbothermal reduction method, in which Taixi coal and Na2SiO3·9H2O were respectively employed as carbon and silica precursors, Fe （NO3）3· 9H2O as the catalyst. XRD, BET and SEM were used to characterize the SiC samples. The results show that the amount of the catalyst has important influences on the stacking fault density, average crystallite size, surface area and morphology of the SiC products What＇s more, when the molar ratio of iron and silicon is 0.01, the silicon carbide sample is β-SIC nanoparticles without other morphologies and the size of SiC particles are in the range of 40-70 nm