Effect of ZrO₂ Additive on the Properties of MgO-Cr₂O₃ Refractory Used for RH Degasser

Abstract:

To improve the properties and RH degasser slag corrosion resistance of magnesia-chrome refractory, the effect of the addition of ZrO₂ was investigated. The results showed that the presence ZrO₂ additive can densify the magnesia-chrome samples due to promotion of grain boundary activities and ultimately direct bond formation, which improved the high temperature mechanical properties and corrosion resistance. The results also indicated that in the RH degasser slag system with a high ratio of calcia to silica, the slag resistance behavior of magnesia-chrome composite added ZrO₂ could be described as follows: the ZrO₂ reacts with CaO to form the calcium zirconate compound which is densification lay and simultaneously, could increase corrosion resistance performance by blinding pore and thickening slag viscosity. Therefore, it is expected to be the major reason for the ZrO₂ enhanced corrosion resistance behavior observed for magnesia-chrome refractory.

• Periodical: Key Engineering Materials (Volume 680)
• Pages: 331-334
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.680.331
• Online since: February 2016
• Authors: Chao Peng*, Wei Bo Yang
• Keywords: MgO-Cr₂O₃ Refractories, RH Degasser, Slag Corrosion Resistance, Zro₂

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