Synthesis of SiC precursors by a two-step sol-gel process and their conversion to SiC powders
文献类型：期刊论文
| 作者 | Li, J. W. ; Tian, J. M. ; Dong, L. M. |
| 刊名 | Journal of the European Ceramic Society
 |
| 出版日期 | 2000 |
| 期号 | 11页码:1853-1857 |
| 关键词 | powders-solid state reaction precursors-organic SiC sol gel processes beta-silicon-carbide ultrafine |
| 其他题名 | J. European Ceram. Soc. |
| 中文摘要 | A 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. |
| 收录类别 | SCI |
| 原文出处 | |
| 语种 | 英语 |
| 公开日期 | 2013-11-15 |
| 版本 | 出版稿 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/6093]  |
| 专题 | 过程工程研究所_研究所（批量导入） |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：过程工程研究所
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