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

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 2.45GHz microwave field in nitrogen atmosphere after 40h milling. For t...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2012-07, Vol.32 (8), p.1787-1794
Main Authors: Moshtaghioun, B.M., Poyato, R., Cumbrera, F.L., de Bernardi-Martin, S., Monshi, A., Abbasi, M.H., Karimzadeh, F., Dominguez-Rodriguez, A.
Format: Article
Language:English
Subjects:
A. Microwave processing
A. Milling
B. X-ray methods
Carbothermic reactions
D. SiC
Heating
Microwaves
Nano powders synthesis
Nanocomposites
Nanomaterials
Nanostructure
Silicon carbide
Synthesis
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Summary: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 2.45GHz microwave field in nitrogen atmosphere after 40h milling. For the first time, the formation of silicon carbide (β-SiC) as a major phase can be achieved at 1200°C in 5min of microwave exposure, resulting in nano sized particles ranging from 10 to 40nm under optimized synthesis condition. The Rietveld quantitative phase-composition analysis confirmed that the major SiC polytype is cubic SiC (β-SiC) with 98.5(4) weight fraction and the remained is minor hexagonal SiC polytypic (α-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.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2011.12.021