SYNTHESIS AND CHARACTERIZATION OFSILICON CARBIDE NANO POWDER BYSOLGELPROCESSING

Abstract: SiC nano particles with mono dispersed distribution were synthesized by using of silicon alkoxides and phenolic resin as starting materials. After synthesis of sample, characterizations of the obtained powder were investigated via Fourier Transform Infrared Spectroscopy (FTIR) with ۴۰۰-۴۰۰۰ cm-۱, X-ray Diffractometry (XRD), Laser Particle Size Analyzing (LPSA), Si۲۹ NMR analysis, Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). FTIR and Si۲۹ NMR results of the gel powder indicated that Si-O-C bonds were formed due to hydrolysis and condensation reactions . FTIR results showed a very strong peak for heat treated powder at ۱۵۰۰°C after carbon removal which is corresponded to Si-C bond. Obtained pattern from X-ray diffractometry showed that the final products contain -SiC phase with poly crystalline planes and little amounts of residual carbon. PSA results showed that the average particles size were ۵۰.۶ nm with monosized distribution. Also microstructural studies showed that the SiC nano powders have semi spherical morphology with mean particles size of ۳۰-۵۰ nm and also there are some agglomerates with irregular shape.