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Effect of Cement and Sol Combined Binders on High-Alumina Refractory Castables

Bonding systems used in the castables had a cement/sol ratio as 00 : 100, 25 : 75, 50 : 50, 75 : 25, and 100 : 00. Castables were processed per conventional preparation, cast under vibration, and heat treated at 110, 900 and 1500 °C respectively. The physical, mechanical and thermomechanical properties of the prepared castables were characterized. The dried strength was found to increase with the increase in cement content in the binder system but the hot strength values were found to decrease. Phase analysis study of the matrix phase of fired compositions confirmed the formation of mullite, grossite, hibonite and anorthite phases in the castables.


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