Synthesis of Al₄SiC₄ powders via carbothermic reduction

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

Xing, Xinming (University of Science and Technology Beijing)
Chen, Junhong (University of Science and Technology Beijing)
Bei, G. (TU Delft (OLD) MSE-1)
Li, Bin (University of Science and Technology Beijing)
Chou, Kuo Chih (University of Science and Technology Beijing)
Hou, Xinmei (University of Science and Technology Beijing)

2017

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 (1 ī0) planes resulting in formation of hexagonal plate-like Al₄SiC₄ grains.

AlSiC
carbothermic reduction
growth mechanism
hexagonal plate-like

http://resolver.tudelft.nl/uuid:0ca06338-57c5-4ed9-8762-8f3c1c4df128

https://doi.org/10.1007/s40145-017-0247-z

2226-4108

Journal of Advanced Ceramics, 6 (4), 351-359

Institutional Repository

journal article

© 2017 Xinming Xing, Junhong Chen, G. Bei, Bin Li, Kuo Chih Chou, Xinmei Hou