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Journal of Ceramic Science and Technology

The Journal of Ceramic Science and Technology publishes original scientific articles on all topics of ceramic science and technology from all ceramic branches. The focus is on the scientific exploration of  the relationships between processing, microstructure and properties of sintered ceramic materials as well as on new processing routes for innovative ceramic materials. The papers may have either theoretical or experimental background. A high quality of publications will be guaranteed by a thorough double blind peer review process.

The Journal is published by Göller Verlag GmbH on behalf of the Deutsche Keramische Gesellschaft (DKG). Edited by Yu-Ping Zeng, Shanghai Institute of Ceramics, Chinese Academy of Sciences, China.

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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

The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science & Technology, Wuhan 430081, PR China

received October 7, 2016, received in revised form June 17, 2017, accepted June 26, 2017

Vol. 8, No. 4, Pages 455-462   DOI: 10.4416/JCST2016-00079

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.

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Keywords

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

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