Ceramics-Silikáty 37, (3) 121 - 125 (1993)

Interaction at the phase boundary, between molten slag and the refractory was studied on L I and L I H magnesite refractories and L III K and L III HK chrome-magnesite refractories, using silicate and ferriticcalcium slags. Slags of the system FeO - Fe₂O₃ - CaO penetrate more readily into the depth of the refractories than the silicate slags, but show lower chemical aggressivity. In the case of L I H and L III K, the matrix is enriched with Ca, Mg silicates. Periclase in L I H gets enriched with the MgFe₂O₃ phase, while periclase grains in L III K tend to dissolve. With the L III HK material, the penetration is not extensive but the boundary is chemically attacked to a higher degree. The ferritic slag enriches the L I material with Fe₂O₃, forming magnesium-ferritic inclusions around the periclase grains. In the case of L I H, Fe₂O₃ penetrates the periclase grains similarly as it does with L III K, where it also attacks the chrome-spinel grains. A more extensive formation of ferritic interstitiary material takes place in L III HK. The effects of ferritic-calcium slags with various CaO contents do not show any substantial differences. The structure in the interaction zone is not significantly affected by changes in the atmosphere.