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The Corrosion of Mg-Partially Stabilized Zirconia During Service in Continuous Casting Tundish
K. Wiśniewska, D. Madej, J. Szczerba
AGH University of Science And Technology, Krakow, Poland
received March 4, 2018, received in revised form June 3, 2018, accepted June 11, 2018
Vol. 9, No. 3, Pages 301-308 DOI: 10.4416/JCST2018-00019
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.
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Keywords
Mg-stabilized zirconia, corrosion, steel casting, refractories
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