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Synthesis of SiC precursors by a two-step sol-gel process and their conversion to SiC powders
Alternative TitleJ. European Ceram. Soc.
Li, J. W.; Tian, J. M.; Dong, L. M.
2000
Source PublicationJournal of the European Ceramic Society
Issue11Pages:1853-1857
AbstractA two-step, sol-gel processing was developed to synthesize phenolic resin SiO2 hybrid gels as SIC precursors, with tetraethoxysilane (TEOS) and novolac phenolic resin being the starting materials, and oxalic acid (OA) and hexamethylenetetramine (HMTA) being the catalysts. At the first step TEOS was prehydrolyzed under the catalysis of OA. At the second step HMTA was added to facilitate gelation. The influences of the molar ratio of OA/TEOS and prehydrolysis time on the sol-gel reaction were investigated. There existed an optimum OA/TEOS ratio where prehydrolysis time needed to form transparent gels was the shortest. The increase of temperature could accelerate sol-gel reaction. The dried hybrid gels were yellowish transparent glassy solids, with uniform microstructure composed of nanometer-sized particles. The conversion of the gels to silicon carbide powders was complete when heated at 1650 degrees C for 30 min in vacuum. The oxygen and free carbon were 0.43 and 0.50 wt%, respectively, in the powder produced from the gel prepared with starting resin/TEOS being 0.143 g/ml. (C) 2000 Elsevier Science Ltd. All rights reserved.
KeywordPowders-solid State Reaction Precursors-organic Sic Sol Gel Processes Beta-silicon-carbide Ultrafine
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Indexed BySCI
Language英语
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/6093
Collection研究所(批量导入)
Recommended Citation
GB/T 7714
Li, J. W.,Tian, J. M.,Dong, L. M.. Synthesis of SiC precursors by a two-step sol-gel process and their conversion to SiC powders[J]. Journal of the European Ceramic Society,2000(11):1853-1857.
APA Li, J. W.,Tian, J. M.,&Dong, L. M..(2000).Synthesis of SiC precursors by a two-step sol-gel process and their conversion to SiC powders.Journal of the European Ceramic Society(11),1853-1857.
MLA Li, J. W.,et al."Synthesis of SiC precursors by a two-step sol-gel process and their conversion to SiC powders".Journal of the European Ceramic Society .11(2000):1853-1857.
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