Effect of MgAl₂O₄ Micrpowder on Physical Properties of Corundum Castables

Abstract:

Corundum-based castables were prepared by using tabular corundum, micropowder of MgAl₂O₄ spinel and calcium aluminate cement as raw materials, as well as the addition of dispersion agent and retarder. The effect of spinel contents on physical properties of the castables has been investigated. The results showed that as the samples were heat treated at 1100 °C and 1600 °C, the linear shrinkage rate decreased and the strength of rupture and crushing at room temperature increased with spinel content increasing, while apparent porosity and bulk density remained the same. The hot modulus of rupture increased from 12 MPa to 20MPa with 67% growth rate, and crushing strength after thermal shock increased from 80MPa to 105MPa with 32% growth rate. The increasing of high-temperature properties was attributed to the staggered distribution between MgAl₂O₄ spinel and CA₆.

• Periodical: Key Engineering Materials (Volume 633)
• Pages: 348-351
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.633.348
• Online since: November 2014
• Authors: Yao Sheng Hu, Ping An Chen, Bo Quan Zhu, Zheng Ma, Xiang Cheng Li*
• Keywords: Corundum Castable, High-Temperature Properties, Micropowder of MgAl₂O₄ Spinel

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