Abstract
The properties of MgO-C bricks containing 0 to 5% aluminum powder were investigated after heat-treatment at 1400°C under different heating conditions. When Al4C3, the reaction product of Al and C, reacts with CO and MgO to form MgAl2O4 and C, a weight increase of MgO-C brick containing Al should be obtained. However, the weight increase decreased with increasing heating rate and Al content. It was considered that Mg(g) diffused to the surface of brick and reacted with CO to form MgO, from the fact that the carbon powder contained MgO after heat-treatment. Mg(g) was generated by the reaction of MgO and Al or C in the brick. The decrease in weight increase was controlled by slow heating. The mechanical properties were almost the same regardless of the difference of weight increase between fast and slow heatings.
