Interfacial Reaction between Al2O3–SiO2–C Refractory and Al/Ti-Killed Steels

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  • Interfacial Reaction between Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub>–C Refractory and Al/Ti-Killed Steels

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In the current investigation, the thin film method was employed to clarify the formation mechanism of the oxide layers at the interface between the Al2O3–SiO2–C refractory and liquid Fe. A reacted layer was formed in such a way that initially FeO-enriched liquid layers are widely distributed on the Fe surface and FeO and SiO2 in the liquid layer are reduced by Al in liquid Fe to develop solid Al2O3-enriched layer of inclusions. Some inclusions in liquid Fe might be produced by the remaining oxygen in Ar gas being supplied through the nozzle to prevent the adherence of inclusions onto it. The oxide layers at the interface estimated by thermodynamic calculation are in good accordance with the experimental results of the reaction between Al2O3–SiO2–C refractory and Al-killed/Al-Ti-killed steels previously reported.

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