INTERFACIAL-TENSIONS BETWEEN CAO-SIO2-AL2 O3 SLAG AND FE-O-S, FE-SI, FE-AL, FE-C, FE-CR OR FE-NI ALLOYS

The interfacial tensions of 35mass%CaO-35mass%SiO2-30mass%Al2O3 slag w ith Fe-O-S, Fe-Si, Fe-Al, Fe-C, Fe-Cr or Fe-Ni alloys were investigate d at 1580 degrees C by the sessile drop method. The interfacial tensio n for Fe-O-S system decreased with increasing oxygen and/or sulfur con tents and their values (sigma) with oxygen and sulfur activities (a) w ere found to follow the relation, sigma(0)-sigma=0.3241n(1+116a(0)+8.5 a(s)) ([S] <1mass%) In evaluating the effect of each alloying element on the interfacial tension, the difference in the oxygen content in ea ch alloy was taken in the consideration. The interfacial tension was i ncreased with increasing aluminum and silicon contents, slightly decre ased with increasing carbon or nickel contents, and markedly decreased with increasing sulfur and chromium contents in the melt.