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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
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
received November 2, 2016, received in revised form December 18, 2016, accepted January 25, 2017
Vol. 8, No. 1, Pages 121-128 DOI: 10.4416/JCST2016-00098
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.
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Keywords
Castables, kinetic, spinel, reaction, properties
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