Abstract
An improved method for measurement of interfacial tension between liquid iron alloy and liquid slag has been developed. The method is based on simultaneous determination both surface tension of liquid iron alloy σmg, which is measured by use of large drop method, and contact angle of liquid slag droplet on the liquid iron alloy. The interfacial tension ‘σms°’ between CaO-Al2O3 slag and liquid iron alloy was determined at 1 570°C by the method within 0.5 second after contacting the two liquids. Results obtained are as follows:(1) Oxygen dissolved in liquid iron brings about drastic decrement of a σms°, while both carbon and chromium in liquid iron lowers slightly σms°.(2) Both decrement of am; and that of crag by addition of one of the elements mentioned above into liquid iron are nearly equal to one another, and also both decrement of σms° and that of surface tension of CaO-Al2O3-SiO2 slag asg by addition of SiO2 component into the slag are nearly equal to one another.(3) Main cause of the interfacial tension character will be induced by independent contributions both of σmg and σsg respectively, while interaction between the slag and the iron alloy may play a minor role in the interfacial tension character.(4) Work of adhesion Wa between the slag and the iron alloy within 0.5 second after contacting the two liquids keeps constant value even when only one of the two liquids makes change in composition.
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