Assimilation Behavior of Calcium Ferrite and Calcium Diferrite with Sintered Al2O3 and MgO

In this study, the assimilation behaviors between calcium ferrite (CF), calcium diferrite (CF 2 ) and sintered Al 2 O 3 , and MgO were explored by an improved sessile drop technique, and the interfacial microstructure was discussed. The results indicated that the apparent contact angles of CF slag on Al 2 O 3 and MgO substrate were 15.7 and 5.5 deg, and the apparent contact angles of CF 2 slag on Al 2 O 3 and MgO substrate were 17.9 and 7.2 deg, respectively. Namely, CF and CF 2 slag were wetting well with Al 2 O 3 and MgO substrate. The dissolution of Al 2 O 3 substrate into the CF and CF 2 slag was found to be the driving force of the wetting process. For the CF-MgO and CF 2 -MgO substrate systems, CaO contrarily distributed with MgO after wetting. For the CF-MgO system, after wetting, the slag was composed of CF and C 2 F, and most of the Fe 2 O 3 permeated into substrate and formed two permeating layers.