Effect of Aluminum and Silicon Antioxidants Addition on Porosity, Cold Crushing Strength, Wear Resistance and Hydration Effect of Alumina Spinel Refractories

Abstract

Abstract Due to their high resistance and wear resistance, alumina spinel (MgAl2O4) are widely used for slide gate on ladle. The characteristics strongly depend on the formation of ceramic phases in the matrix. Addition of antioxidants is used to prevent the graphite oxidation, possibly leading to porosity increase. Currently, other problem appears as the consequences of climate change. The object of this research is to study the effect of antioxidants addition in temperature variations. The influence of Al and Si addition is investigated by means of XRD, SEM, TGA-DTA, apparent porosity, CCS, wear resistance and hydration resistance tests. It was found that lowest porosity, highest CCS and best wear resistance were reached by sample containing Al 5% in 1400°C, while best hydration resistance was reached by sample containing Si 5%.