SYNTHESIS AND CHARACTERIZATION OFSILICON CARBIDE NANO POWDER BY SOL GEL PROCESSING

A Najafi, F Golestani-Fard, H Rezaie, N Ehsani
2018 Downloaded from ijmse.iust.ac.ir at 7:37 IRDT on Thursday   unpublished
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 400-4000 cm-1 , X-ray Diffractometry (XRD), Laser Particle Size Analyzing (LPSA), Si 29 NMR analysis, Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). FTIR and Si 29 NMR results of the
more » ... MR 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 1500°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 50.6 nm with monosized distribution. Also microstructural studies showed that the SiC nano powders have semi spherical morphology with mean particles size of 30-50 nm and also there are some agglomerates with irregular shape.
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