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Research Article | Open Access

Synthesis of Al4SiC4 powders via carbothermic reduction: Reaction and grain growth mechanisms

Xinming XINGa, Junhong CHENa( ), Guoping BEIb, Bin LIc, Kuo-Chih CHOUc, Xinmei HOUc( )
School of Material Science and Technology, University of Science and Technology Beijing, Beijing 100083, China
Department of Materials Science and Engineering, 3ME, Delft University of Technology, Delft, 2628CD, the Netherlands
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
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Abstract

Highly pure Al4SiC4 powders were prepared by carbothermic reduction at 2173 K using Al2O3, SiO2, and graphite as raw materials. The obtained Al4SiC4 powders owned hexagonal plate-like grains with a diameter of about 200-300 μm and a thickness of about 2-6 μm. Based on the experimental results, the reaction of Al4SiC4 formation and grain evolution mechanisms were determined from thermodynamic and first-principles calculations. The results indicated that the synthesis of Al4SiC4 by the carbothermic reduction consisted of two parts, i.e., solid-solid reactions initially followed by complex gas-solid and gas-gas reactions. The grain growth mechanism of Al4SiC4 featured a two-dimensional nucleation and growth mechanism. The gas phases formed during the sintering process favored the preferential grain growth of (0010) and (11¯0) planes resulting in formation of hexagonal plate-like Al4SiC4 grains.

Keywords

Al4SiC4carbothermic reductionhexagonal plate-likegrowth mechanism

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Journal of Advanced Ceramics
Volume 6 Issue 4,
December 2017
Pages 351-359
DOI: 10.1007/s40145-017-0247-z
Cite this article:
XING X, CHEN J, BEI G, et al. Synthesis of Al4SiC4 powders via carbothermic reduction: Reaction and grain growth mechanisms. Journal of Advanced Ceramics, 2017, 6(4): 351-359. https://doi.org/10.1007/s40145-017-0247-z

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Received: 08 July 2017
Revised: 22 August 2017
Accepted: 08 September 2017
Published: 19 December 2017
© The author(s) 2017

Open Access The articles published in this journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons. org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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