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Experimental studies on self-propagating high-temperature synthesis of Si-SiC composite from reactants of SiO2 derived from corn cob ash/C/Mg

Experimental studies on self-propagating high-temperature synthesis of Si-SiC composite from... This work was an experimental study of the self-propagating high-temperature synthesis (SHS) of Si-SiC composite using reactant powders of SiO2 derived from corn cob ash (CCA), elemental carbon, and elemental magnesium in the molar ratios 2:1:4, respectively. The in-situ SHS reaction was carried out under a static argon environment using an ignition source of Fe2O3: Al ignited by a tungsten-wire heated by electric current. The thermodynamic and formation reaction mechanisms to the final Si-SiC composite were investigated. The synthesized product powders were leached in two steps with HCl:CH3COOH and HF:H2O solutions, respectively. The microstructure and chemical composition of all product powders, both (as synthesized and as leached) were characterized using a scanning electron microscope (SEM) equipped with an energy dispersive X-ray spectrometer (EDS) and an X-ray diffractometer (XRD). The XRD analysis results of the leached product powders clearly showed the formation of Si and SiC phases. SEM observation revealed the agglomerated morphology of the Si-SiC composite powders. All these results suggested that CCA would be a promising low-cost silica source for the synthesis of Si-SiC composite. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of the Australian Ceramic Society Springer Journals

Experimental studies on self-propagating high-temperature synthesis of Si-SiC composite from reactants of SiO2 derived from corn cob ash/C/Mg

Journal of the Australian Ceramic Society , Volume 53 (1) – Feb 25, 2017

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Publisher
Springer Journals
Copyright
Copyright © 2017 by Australian Ceramic Society
Subject
Materials Science; Ceramics, Glass, Composites, Natural Materials; Materials Engineering; Inorganic Chemistry
ISSN
2510-1560
eISSN
2510-1579
DOI
10.1007/s41779-017-0030-1
Publisher site
See Article on Publisher Site

Abstract

This work was an experimental study of the self-propagating high-temperature synthesis (SHS) of Si-SiC composite using reactant powders of SiO2 derived from corn cob ash (CCA), elemental carbon, and elemental magnesium in the molar ratios 2:1:4, respectively. The in-situ SHS reaction was carried out under a static argon environment using an ignition source of Fe2O3: Al ignited by a tungsten-wire heated by electric current. The thermodynamic and formation reaction mechanisms to the final Si-SiC composite were investigated. The synthesized product powders were leached in two steps with HCl:CH3COOH and HF:H2O solutions, respectively. The microstructure and chemical composition of all product powders, both (as synthesized and as leached) were characterized using a scanning electron microscope (SEM) equipped with an energy dispersive X-ray spectrometer (EDS) and an X-ray diffractometer (XRD). The XRD analysis results of the leached product powders clearly showed the formation of Si and SiC phases. SEM observation revealed the agglomerated morphology of the Si-SiC composite powders. All these results suggested that CCA would be a promising low-cost silica source for the synthesis of Si-SiC composite.

Journal

Journal of the Australian Ceramic SocietySpringer Journals

Published: Feb 25, 2017

References