Effect of TiO2 on the properties of ultralow-cement alumina-spinel castables
An ultralow-cement castable based on the Al2O3-MgO spinel system is synthesized by the interaction of fused alumina (70%) and sintered periclase (30%) using a calcium aluminate cement (75% Al2O3) and a co-deposited gel Al(OH)3 and Mg(OH)2 as the castable bond. The addition of TiO2 and its effect on the apparent density, volume shrinkage, open porosity, and true density of sintered specimens (at 1400–1600 °C) is studied. Results of a microstructure analysis using x-ray diffractometry and scanning electron microscopy are reported. The additive TiO2 is shown to exert a positive effect on the formation of spinel and physicomechanical properties of the system.
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