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The Corrosion of Mg-Partially Stabilized Zirconia During Service in Continuous Casting Tundish

K. Wiśniewska, D. Madej, J. Szczerba

Journal of Ceramic Science and Technology, Vol. 9, No. 3 (2018), pp. 301-308

DOI: 10.4416/JCST2018-00019

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Abstract

One possible application for zirconium oxide is as a metering nozzle in a tundish for continuous steel casting. Such nozzles are mounted at the bottom of the tundish, and they are exposed to the corrosive effect of liquid steel at a temperature up to 1600 °C. In this study, the corrosion behavior of the zirconia metering nozzle after service in a tundish for continuous steel casting was investigated. The phase composition and chemical composition were investigated by means of x-ray diffraction and x-ray fluorescence, respectively. The microstructure of the nozzles was observed using a scanning electron microscope coupled with an energy-dispersive x-ray system. The major phases present in the metering nozzles were monoclinic zirconium oxide and Mg-stabilized zirconium oxide. With this investigation, it was possible to characterize the behavior of Mg-partially stabilized zirconia during steel casting. In each of the corroded nozzles, it was possible to distinguish two zones. The first zone was a light uncorroded area of the nozzle, and the second was a dark zone from the \"hot face\" of the nozzle. Furthermore, cracks along the surface of the brick were present in all corroded nozzles. SEM/EDS investigation confirmed that during the corrosion process liquid steel and inclusion infiltrate the zirconia nozzle.

Keywords

Mg-stabilized zirconia, corrosion, steel casting, refractories

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