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Effect of Alumina-Coated Graphite (ACG) on the Microstructure and Mechanical Properties of Al₂O₃-C Refractories

X. Xu, Y. Li, Q. Wang, S. Sang, L. Pan

Journal of Ceramic Science and Technology, Vol. 8, No. 4 (2018), pp. 455-462

DOI: 10.4416/JCST2016-00079

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Abstract

Alumina-coated graphite (ACG) was prepared by soaking expanded graphite (EG) in an AlCl3 solution with vacuum impregnation. The graphite was then filtered, dried and treated in a coke bed at 400 – 1000 °C. The ACG was incorporated into Al2O3-C refractories, partly or completely replacing EG. The results showed that the alumina coating on the graphite was effective and delayed the oxidation behavior of the expanded graphite. It also allowed the structure of the graphite to survive largely intact at high temperatures as it had been incorporated into the Al2O3-C refractories while there were fewer in situ-formed ceramic phases in the matrix, e.g. SiC whiskers. As a result, ACG-containing Al2O3-C refractories exhibited better thermal shock resistance than that of common Al2O3-C refractories.

Keywords

Alumina-coated graphite, expanded graphite, microstructure, mechanical properties

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