Lightweight Al 2 O 3 –MgO refractory castables were prepared using microporous corundum–spinel aggregate, which was fabricated using the Kirkendall effect. The physical properties, microstructure, thermal conductivity, and slag resistance of the castables were analyzed using X-ray diffractometry (XRD), scanning electron microscopy (SEM), and thermodynamic calculations. A comparative analysis was carried out between these findings and the corresponding ones for dense aggregates of Al 2 O 3 –MgO castables. Compared with dense aggregates, the r...
