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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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Study on the Effect of MgO Addition on the Physical, Mechanical and Thermal Properties of Alumina-Zirconia-Carbon Refractories

M. Abolfazli, M. Hossein Paydar

Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz, Iran

received May 31, 2021, received in revised form October 12, 2021, accepted October 13, 2021

Vol. 13, No. 1, Pages 9-14   DOI: 10.4416/JCST2021-00009

Abstract

In this study, the effect of magnesium oxide addition (0 – 10 wt%) on the microstructure, mechanical properties, corrosion and oxidation resistance of alumina-graphite refractory bodies containing 20 wt% zirconia was investigated. Samples were fabricated by mixing raw materials with phenolic resin as a binder. The powder mixtures were isostatically pressed at 850 bar and sintered at 1 400 °C for 8 h under reducing atmosphere. The results showed that the presence of MgO reduces the bulk density, which causes more slag penetration and thus reduces corrosion resistance. Also, evaluation of the mechanical properties reveals that with increasing magnesium content, the flexural strength and compressive strength of the samples decrease. Furthermore, it has been proved that positive permanent linear change owing to spinel formation leads to a reduction in thermal shock resistance.

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Keywords

Alumina-carbon composite, refractory, stopper, microstructure, mechanical properties, magnesia

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