Synthesis of nanometre silicon carbide whiskers from binary carbonaceous silica aerogels
Synthesis of nanometre silicon carbide whiskers from binary carbonaceous silica aerogels
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DOI：
10.1016/s0008-6223(00)00020-8
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发表时间：
2001-01-01
期刊：
影响因子：
10.9
通讯作者：
Ling, LC
中科院分区：
文献类型：
--
作者：
Li, XK;Liu, L;Ling, LC
基于二元碳质二氧化硅气凝胶的碳热还原反应，提出了一种制备纳米碳化硅晶须的新工艺。该工艺使用二元碳质二氧化硅气凝胶作为前驱体。前驱体来源于碳质溶胶和硅质溶胶，采用溶胶-凝胶超临界流体干燥法制备，具有较高的反应物接触面积。碳化硅在碳中的均匀分布及其松散的结构形成了更纯净的纳米碳化硅晶须。采用TEM、EDX和XRD对前驱体及其碳热还原产物进行了表征。讨论了热处理温度对碳化硅晶须制备的影响。2001爱思唯尔科学有限公司版权所有。
A novel synthesis process, based on a carbothermal reduction reaction of binary carbonaceous silica aerogels, has been developed for producing nanometre silicon carbide whiskers. The process uses binary carbonaceous silica aerogels as precursors. The precursors, which are derived from carbonaceous sol and silica sol. are prepared by sol-gel supercritical fluid drying and provide a high contact area of reactants. The homogeneous distribution of silica within carbon and their loose structure result in the formation of purer nanometre silicon carbide whiskers. The precursors and their carbothermal reduction products are investigated by TEM, EDX and XRD analysts. The effect of heat-treatment temperature on the production of SIC whiskers is discussed. (C) 2001 Elsevier Science Ltd. All rights reserved.