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Effects of TiO₂ Addition on Kinetics of In Situ Spinel Formation and Properties of Alumina-Magnesia Refractory Castables

W. Yuan, H. Tang, H. Shang, J. Li, C. Deng, H. Zhu

Journal of Ceramic Science and Technology, Vol. 8, No. 1 (2017), pp. 121-128

DOI: 10.4416/JCST2016-00098

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Abstract

This work addresses the effects of TiO2 addition on the kinetics of in situ spinel formation and the properties of alumina-magnesia refractory castables. The kinetics of the formation of spinel in alumina-magnesia refractory castables with TiO2 addition (0 – 3 wt%) during firing at 1250 – 1450 °C for different times was investigated by means of XRD analysis. The reaction rate constant and apparent activation energy of spinel formation in castables calculated based on the Ginstling-Braunstein model varied with the firing temperature and TiO2 addition. A comparison of the castables' properties including permanent linear changes, apparent porosity and strength was discussed. The results demonstrated that the in situ reactions and properties of the alumina-magnesia refractory castables depend on the combined effects of TiO2.

Keywords

Castables, kinetic, spinel, reaction, properties

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