Relation between Corrosion Rate of Magnesia Refractories by Molten Slag and Penetration Rate of Slag into Refractories

Corrosion tests on magnesia refractories in molten CaO-SiO2-CaF2-Al2O3 slags have been conducted at 1873K in a high frequency induction furnace. By combining the corrosion rate with the microstructures of tested specimens and the theoretical analysis of the slag penetration, a penetration resistance coefficient of refractory, Rp was introduced as an index for evaluating the corrosion behavior of the refractory. Using this index the penetration behavior of the slag into the refractory was evaluated and the penetration rate of slag into the refractory was related to the corrosion rate, which suggests the possibility of developing a refractory resistant to both spalling and corrosion.