NDLI: SHS synthesis of Si-SiC composite powders using Mg and reactants from industrial waste

Content Provider	Springer Nature Link
Author	Chanadee, Tawat
Copyright Year	2017
Abstract	Si-SiC composite powders were synthesized by self-propagating high-temperature synthesis (SHS) using reactants of fly ash-based silica, sawdust-based activated carbon, and magnesium. Fly ash-based silica and sawdust-based activated carbon were prepared from coal mining fly ash and Para rubber-wood sawdust, respectively. The work investigated the effects of the synthesis atmosphere (air and Ar) on the phase and morphology of the SHS products. The SHS product was leached by a two-step acid leaching processes, to obtain the Si-SiC composite powder. The SHS product and SHS product after leaching were characterized by X-ray diffractometry, scanning electron microscopy and energy dispersive X-ray spectrometry. The results indicated that the SHS product synthesized in air consisted of Si, SiC, MgO, and intermediate phases (SiO$_{2}$, Mg, Mg$_{2}$SiO$_{4}$, Mg$_{2}$Si), whereas the SHS product synthesized in Ar consisted of Si, SiC, MgO and a little Mg$_{2}$SiO$_{4}$. The SiC content in the leached-SHS product was higher when Ar was used as the synthesis atmosphere. As well as affecting the purity, the synthesis atmospheres also affected the average crystalline sizes of the products. The crystalline size of the product synthesized in Ar was smaller than that of the product synthesized in air. All of the results showed that fly ash and sawdust could be effective waste-material reactants for the synthesis of Si-SiC composite powders.
Starting Page	1188
Ending Page	1196
Page Count	9
File Format	PDF
ISSN	15989623
Journal	Metals and Materials
Volume Number	23
Issue Number	6
e-ISSN	20054149
Language	English
Publisher	The Korean Institute of Metals and Materials
Publisher Date	2017-11-14
Publisher Place	Seoul
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	composites self-propagating synthesis crystallization phase transformation X-ray diffraction Metallic Materials Operating Procedures, Materials Treatment Magnetism, Magnetic Materials Engineering Thermodynamics, Heat and Mass Transfer Characterization and Evaluation of Materials Continuum Mechanics and Mechanics of Materials
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Mechanics of Materials Metals and Alloys Condensed Matter Physics

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