Effects of Fe/Si Stoichiometry on Formation of Fe3Si/FeSi-Al2O3 Composites by Aluminothermic Combustion Synthesis

Aluminothermic combustion synthesis was conducted with Fe2O3–Al–Fe–Si reaction systems under Fe/Si stoichiometry from Fe-20 to Fe-50 at. % Si to investigate the formation Fe3Si/FeSi–Al2O3</sub&g...

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Auteurs principaux:	Chun-Liang Yeh, Kuan-Ting Chen, Tzong-Hann Shieh
Format:	article
Langue:	EN
Publié:	MDPI AG 2021
Sujets:	iron silicides composites self-propagating high-temperature synthesis (SHS) aluminothermic reduction combustion kinetics Mining engineering. Metallurgy TN1-997
Accès en ligne:	https://doaj.org/article/108437ef68224d868b3d5135a3fb604f
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spelling	oai:doaj.org-article:108437ef68224d868b3d5135a3fb604f2021-11-25T18:21:22ZEffects of Fe/Si Stoichiometry on Formation of Fe<sub>3</sub>Si/FeSi-Al<sub>2</sub>O<sub>3</sub> Composites by Aluminothermic Combustion Synthesis10.3390/met111117092075-4701https://doaj.org/article/108437ef68224d868b3d5135a3fb604f2021-10-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1709https://doaj.org/toc/2075-4701Aluminothermic combustion synthesis was conducted with Fe<sub>2</sub>O<sub>3</sub>–Al–Fe–Si reaction systems under Fe/Si stoichiometry from Fe-20 to Fe-50 at. % Si to investigate the formation Fe<sub>3</sub>Si/FeSi–Al<sub>2</sub>O<sub>3</sub> composites. The solid-state combustion was sufficiently exothermic to sustain the overall reaction in the mode of self-propagating high-temperature synthesis (SHS). Dependence of iron silicide phases formed from SHS on Fe/Si stoichiometry was examined. Experimental evidence indicated that combustion exothermicity and flame-front velocity were affected by the Si percentage. According to the X-ray diffraction (XRD) analysis, Fe<sub>3</sub>Si–Al<sub>2</sub>O<sub>3</sub> composites were synthesized from the reaction systems with Fe-20 and Fe-25 at.% Si. The increase of Si content led to the formation of both Fe<sub>3</sub>Si and FeSi in the final products of Fe-33.3 and Fe-40 at.% Si reaction systems, and the content of FeSi increased with Si percentage. Further increase of Si to Fe-50 at.% Si produced the FeSi–Al<sub>2</sub>O<sub>3</sub> composite. Scanning electron microscopy (SEM) images revealed that the fracture surface morphology of the products featured micron-sized and nearly spherical Fe<sub>3</sub>Si and FeSi particles distributing over the dense and connecting substrate formed by Al<sub>2</sub>O<sub>3</sub>.Chun-Liang YehKuan-Ting ChenTzong-Hann ShiehMDPI AGarticleiron silicidescompositesself-propagating high-temperature synthesis (SHS)aluminothermic reductioncombustion kineticsMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1709, p 1709 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	iron silicides composites self-propagating high-temperature synthesis (SHS) aluminothermic reduction combustion kinetics Mining engineering. Metallurgy TN1-997
spellingShingle	iron silicides composites self-propagating high-temperature synthesis (SHS) aluminothermic reduction combustion kinetics Mining engineering. Metallurgy TN1-997 Chun-Liang Yeh Kuan-Ting Chen Tzong-Hann Shieh Effects of Fe/Si Stoichiometry on Formation of Fe<sub>3</sub>Si/FeSi-Al<sub>2</sub>O<sub>3</sub> Composites by Aluminothermic Combustion Synthesis
description	Aluminothermic combustion synthesis was conducted with Fe<sub>2</sub>O<sub>3</sub>–Al–Fe–Si reaction systems under Fe/Si stoichiometry from Fe-20 to Fe-50 at. % Si to investigate the formation Fe<sub>3</sub>Si/FeSi–Al<sub>2</sub>O<sub>3</sub> composites. The solid-state combustion was sufficiently exothermic to sustain the overall reaction in the mode of self-propagating high-temperature synthesis (SHS). Dependence of iron silicide phases formed from SHS on Fe/Si stoichiometry was examined. Experimental evidence indicated that combustion exothermicity and flame-front velocity were affected by the Si percentage. According to the X-ray diffraction (XRD) analysis, Fe<sub>3</sub>Si–Al<sub>2</sub>O<sub>3</sub> composites were synthesized from the reaction systems with Fe-20 and Fe-25 at.% Si. The increase of Si content led to the formation of both Fe<sub>3</sub>Si and FeSi in the final products of Fe-33.3 and Fe-40 at.% Si reaction systems, and the content of FeSi increased with Si percentage. Further increase of Si to Fe-50 at.% Si produced the FeSi–Al<sub>2</sub>O<sub>3</sub> composite. Scanning electron microscopy (SEM) images revealed that the fracture surface morphology of the products featured micron-sized and nearly spherical Fe<sub>3</sub>Si and FeSi particles distributing over the dense and connecting substrate formed by Al<sub>2</sub>O<sub>3</sub>.
format	article
author	Chun-Liang Yeh Kuan-Ting Chen Tzong-Hann Shieh
author_facet	Chun-Liang Yeh Kuan-Ting Chen Tzong-Hann Shieh
author_sort	Chun-Liang Yeh
title	Effects of Fe/Si Stoichiometry on Formation of Fe<sub>3</sub>Si/FeSi-Al<sub>2</sub>O<sub>3</sub> Composites by Aluminothermic Combustion Synthesis
title_short	Effects of Fe/Si Stoichiometry on Formation of Fe<sub>3</sub>Si/FeSi-Al<sub>2</sub>O<sub>3</sub> Composites by Aluminothermic Combustion Synthesis
title_full	Effects of Fe/Si Stoichiometry on Formation of Fe<sub>3</sub>Si/FeSi-Al<sub>2</sub>O<sub>3</sub> Composites by Aluminothermic Combustion Synthesis
title_fullStr	Effects of Fe/Si Stoichiometry on Formation of Fe<sub>3</sub>Si/FeSi-Al<sub>2</sub>O<sub>3</sub> Composites by Aluminothermic Combustion Synthesis
title_full_unstemmed	Effects of Fe/Si Stoichiometry on Formation of Fe<sub>3</sub>Si/FeSi-Al<sub>2</sub>O<sub>3</sub> Composites by Aluminothermic Combustion Synthesis
title_sort	effects of fe/si stoichiometry on formation of fe<sub>3</sub>si/fesi-al<sub>2</sub>o<sub>3</sub> composites by aluminothermic combustion synthesis
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/108437ef68224d868b3d5135a3fb604f
work_keys_str_mv	AT chunliangyeh effectsoffesistoichiometryonformationoffesub3subsifesialsub2subosub3subcompositesbyaluminothermiccombustionsynthesis AT kuantingchen effectsoffesistoichiometryonformationoffesub3subsifesialsub2subosub3subcompositesbyaluminothermiccombustionsynthesis AT tzonghannshieh effectsoffesistoichiometryonformationoffesub3subsifesialsub2subosub3subcompositesbyaluminothermiccombustionsynthesis
_version_	1718411241149431808

Effects of Fe/Si Stoichiometry on Formation of Fe<sub>3</sub>Si/FeSi-Al<sub>2</sub>O<sub>3</sub> Composites by Aluminothermic Combustion Synthesis

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