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Issue 10, 2018
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Formation mechanism of large size plate-like Al4SiC4 grains by a carbothermal reduction method

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Abstract

High temperature experiments and thermodynamic calculations were carried out to investigate the formation mechanism of large size plate-like Al4SiC4 grains during a carbothermal reduction process. Al4SiC4 grains with different morphologies were synthesized at different temperatures and plate-like Al4SiC4 grains with an average diameter of above 100 μm were obtained. The atomic structure of Al4SiC4 at different temperatures was obtained by using HRTEM with SAED. The results indicated that Al4SiC4 crystal nuclei were firstly formed by solid–solid reactions and then grew into little grains with the assistance of reactant gases. Then, large plate-like grains with a porous surface were formed via sintering of those little Al4SiC4 grains. Then, through the evaporation–condensation mass transfer process, the pores disappeared and large size hexagonal plate-like Al4SiC4 grains were eventually formed in the product.

Graphical abstract: Formation mechanism of large size plate-like Al4SiC4 grains by a carbothermal reduction method

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Publication details

The article was received on 20 Dec 2017, accepted on 29 Jan 2018 and first published on 29 Jan 2018


Article type: Paper
DOI: 10.1039/C7CE02193C
Citation: CrystEngComm, 2018,20, 1399-1404
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    Formation mechanism of large size plate-like Al4SiC4 grains by a carbothermal reduction method

    X. Xing, B. Li, J. Chen and X. Hou, CrystEngComm, 2018, 20, 1399
    DOI: 10.1039/C7CE02193C

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