Synthesis of Nanocrystalline Silicon Carbide Powder by Precipitaion-spray Drying

doi:10.3724/SP.J.1077.2006.01319

Abstract

Abstract: Nanocrystalline SiC powder was synthesized by carbothermal reduction of the precursor of carbon black and silica gel prepared by precipitationspray drying slurry of carbon black and water glass. The carbothermal reduction of the precursors can be completed at 1500℃ for 5h because the method provides intimate contact between the reactants. The product was characterized by XRD, BET, SEM and TEM, the influence of temperature and time on the reaction was also studied. The results show that the powder synthesized at 1500℃ for 5h has characteristics of high quality with an average crystalline size of 37nm and specific surface area of 12.4m²/g. It reveales that during carbonthermal reation, appropreately rising temperature and shortening reaction time will be favorable to obtain the reation product of SiC with high quality.

Key words: silicon carbide, water glass, precipitation-spray drying, carbothermal reduction

CLC Number:

TQ174

PAN Shun-Long,YANG Yan-Feng,ZHANG Jing-Jie,SONG Guang-Zhi. Synthesis of Nanocrystalline Silicon Carbide Powder by Precipitaion-spray Drying[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2006.01319.

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Synthesis of Nanocrystalline Silicon Carbide Powder by Precipitaion-spray Drying

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