Naotaka Fukami

Thermodynamic Study on Interfacial Reaction between Molten Iron and Spinel

The effect of the oxygen concentration in the molten iron on the formation of the FeO-MgO phase at the interface between the MgAl2O4 spinel substrate and the molten iron was investigated at 1833 K on the basis of thermodynamics. The results showed that the FeO-MgO phase was formed at the interface between the molten iron and the substrate, if the oxygen concentration in the molten iron was larger than 0.04 mass% for the 50mol%Al2O3-50mol%MgO substrate and 0.08 mass% for the 61mol%Al2O3-39mol%MgO substrate, respectively. For both the substrates, with increasing the oxygen concentration in the molten iron, the activity coefficient of FeO in the spinel substrate increased, and when this value reached above 1.5, a part of MgO was discharged from the spinel and reacted with Fe and oxygen in the molten iron to form the FeO-MgO phase.

Thermodynamic Study on Interfacial Reaction between Blast Furnace Slag and Silicon Carbide

Silicon carbide(SiC) is used as a raw material contained in the refractory that is in contact with molten iron or slag during steel-making processes. In present work, the interfacial reactions between the SiC ceramic substrate and the blast furnace slag were investigated and the thermodynamic study on the reaction products was carried out. The results showed that the Ti component contained in the slag became TiC, and gathered at the whole interface between the SiC substrate and the slag after experiments.