Journal of Materials, Processes and Environment

Effect Of C/si Ratio On Structural Properties Of Silicon Carbide Particles Produced By Sol-gel

Auteurs : Benfadel Karima . Kaci Samira . Keffous Aissa . Benmounah Abdelbaki .

Résumé

In this study, silicon carbide (SiC) nano-powders were synthesized by the sol-gel method. Sucrose and TEOS have been used as carbon and silicon precursors respectively. Various solutions were prepared by varying the C/Si ratio (3, 4 and 5). The gels obtained were placed inside an alumina tube in the center of an annealing furnace which was heated to 1000°C with a heating step of 20°C/min, after one hour of annealing, the heating is restarted with a step of 10°C/min up to 1500°C under an argon atmosphere, this temperature was held for 3 hours to facilitate the carbothermal reduction. The effect of the C/Si ratio was studied on the structural properties. The XRD indicated that the powders produced under these conditions show the presence of the different phases of SiC. SEM micrographs of SiC powders deposited by sol gel on Si substrates revealed that the C/Si = 3 and C/Si = 4 ratios gave rise to particles with nanometric grain sizes. Maximum yield with reduced grain size and minimum agglomeration were obtained in the case of the powder produced with the ratio C/Si=4. According to the results obtained, the ratio C/Si=4 constitutes the better optimization for obtaining silicon carbide.

Mots clés

silicon carbide ; sol-gel ; C ; C/Si ; XRD ; SEM