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Basic experiments were conducted on the adhesion of Al 2 O 3 in molten steel when molten FeO is present in the molten steel. It was found that the adhesion and coalescence of Al 2 O 3 particles are promoted when molten FeO is present in the molten steel, that FeO and FeAl 2 O 4 are observed in the bond between the Al 2 O 3 particles, and that this observed result agrees with the pattern of Al 2 O 3 adhesion to the continuous caster nozzle when the molten steel is reoxidized. Based on these experimental results, a study was made of the mechanism whereby Al 2 O 3 adheres to the continuous caster nozzle when the molten steel is reoxidized. When the oxygen concentration in the molten steel is locally raised by the reoxidation of the molten steel, the adhesion force of the Al 2 O 3 particles due to the liquid bridge force of the molten FeO is far greater than the adhesion force of the Al 2 O 3 particles due to the van der Waals force or the surface tension of the molten steel. The adhesion of Al 2 O 3 to the nozzle interface is thus considered to proceed mainly with the molten FeO serving as binder. Since the molten FeO binder changes into a solid bridge of FeAl 2 O 4 in a short time, the Al 2 O 3 particles adhering to the nozzle interface are considered to integrate to form a network of Al 2 O 3 particles faster than possible with solid-phase sintering.

Mechanism of Alumina Adhesion to Continuous Caster Nozzle with Reoxidation of Molten Steel.