Comparison of corrosion resistance of high chromia brick, high zirconia brick, fused AZS brick and Si3N4 bonded SiC brick against coal slag

Abstract Corrosion resistance of four typical refractories against coal-water slurry coal slag, was investigated in laboratory. These typical refractories are high chromia brick (Cr2O3–Al2O3–ZrO2), fused AZS brick (Al2O3–ZrO2–SiO2), high zirconia brick (ZrO2) and Si3N4 bonded SiC brick, respectively. The cup test and micro-structural analysis method were used to evaluate the corrosion resistance and reaction mechanism at high temperature. Meanwhile, potential reactions between refractories and slag are predicted using thermodynamic calculation. The result shows that infiltrated depth increases in following order: Si3N4 bonded SiC brick