Rapid carbothermic synthesis of silicon carbide nano powders by using microwave heating

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• 作者：B.M. Moshtaghioun^a ; ^c ; ^{mmoshtagh@ma.iut.ac.ir} ; ^{mali.moshtagh@gmail.com} ; R. Poyato^b ; F.L. Cumbrera^a ; S. de Bernardi-Martin^a ; A. Monshi^c ; M.H. Abbasi^c ; F. Karimzadeh^c ; A. Dominguez-Rodriguez^a
• 关键词：A. Microwave processing ; A. Milling ; B. X-ray methods ; D. SiC ; Nano powders synthesis
• 刊名：Journal of the European Ceramic Society
• 出版年：2012
• 期刊代码：53_09552219
• 类别：ms
• 出版时间：July, 2012
• 卷：32
• 期：8
• 页码：1787-1794
• 文件大小：1362 K

摘要

This paper reports an improved procedure for synthesis of silicon carbide nanopowders from silica by carbothermic reduction under fast microwave-induced heating. The powders have been prepared by direct solid-state reaction in a 2.45 GHz microwave field in nitrogen atmosphere after 40 h milling. For the first time, the formation of silicon carbide (尾-SiC) as a major phase can be achieved at 1200 掳C in 5 min of microwave exposure, resulting in nano sized particles ranging from 10 to 40 nm under optimized synthesis condition. The Rietveld quantitative phase-composition analysis confirmed that the major SiC polytype is cubic SiC (尾-SiC) with 98.5(4) weight fraction and the remained is minor hexagonal SiC polytypic (伪-SiC) phases. Therefore this method is the most efficient one for SiC powder synthesis in terms of energy and time saving as well as preparation of SiC nano powders.