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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

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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.

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Acknowledgements

The author is thankful to Miss Sakonrat Chaiyarat, B. Sc student in Materials Science Program and Miss Saowanee Singsarothai, Ph. D student in Materials Engineering Program, for their valuable help in carrying out some experiments and is highly grateful to Assoc. Prof. Dr. Sutham Niyomwas for providing the SHS reactor. The author is also grateful to the academician Thomas Duncan for suggestions that greatly improved the English text.

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Authors and Affiliations

  1. Department of Materials Science and Technology, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, 90110, Thailand

    T. Chanadee

  2. Ceramic and Composite Materials Engineering Research Group (CMERG), Center of Excellence in Materials Engineering (CEME), Prince of Songkla University, Hat Yai, Songkhla, 90110, Thailand

    T. Chanadee

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  1. T. Chanadee
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Correspondence to T. Chanadee.

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Chanadee, T. Experimental studies on self-propagating high-temperature synthesis of Si-SiC composite from reactants of SiO2 derived from corn cob ash/C/Mg. J Aust Ceram Soc 53, 245–252 (2017). https://doi.org/10.1007/s41779-017-0030-1

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  • DOI: https://doi.org/10.1007/s41779-017-0030-1

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