Surface Tension of Molten Fe-O-S Alloy

Abstract

The effect of coexistence of a plural surface active elements, oxygen and sulphur, on the surface tension of molten iron has been studied. Measurements of the surface tension of molten iron have been carried out with the sessile drop method at 1 600°C.
The surface tension of molten Fe-O-S alloy is represented by the following equation.
γ=1 910-825 log(1+210wt%O)-540 log(1+185wt%S) (dye/cm) (0≤wt%O/0.0160+wt%S/0.0300≤1)
The validity of the equation has been confirmed by an application of this equation to data of other investigators.
The average occupied area in the coexistence of oxygen and sulphur is smaller than that in the individual existence of oxygen or sulphur in molten iron. This fact implies that oxygen and sulphur are more closely packed when they coexist.