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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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