Thermodynamic Study on Interfacial Reaction between Molten Iron and Spinel

Abstract:

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.

• Periodical: Key Engineering Materials (Volume 705)
• Pages: 219-223
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.705.219
• Online since: August 2016
• Authors: Hirohide Okuno*, Naotaka Fukami, Nobuya Shinozaki
• Keywords: Interfacial Reaction, Molten Iron, Spinel, Thermodynamics

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