Effect of ZrO2 on the Properties and RH Degasser Slag Corrosion Resistance Behavior of MgO-Cr2O3 Refractory

摘要

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 the 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 with ZrO2 could be described as follows:the ZrO2 reacts with CaO to form the calcium zirconate compound which functions as densification and simultaneously increases corrosion resistance performance by blinding pores and thickening slag viscosity.Therefore,it is expected to be the major reason why ZrO2 enhanced corrosion resistance of magnesia-chrome refractory.