Abstract
In order to determine the surface tension of molten binary CaO-SiO2 slag, surface tension measurements on synthetic slags have been made by the maximum bubble pressure method using argon or oxygen as the bubble forming gas. During the experiment, the rate of bubble formation has been kept constant at the rate of one bubble every 60 sec. The results obtained are as follows:(1) The surface tension of a series of compositions ranging from 43.8 to 63.2 molar % of SiO2 in the temperature range from 1475° to 1600°C is determined.(2) The surface tension of the slag decreases as the content of SiO2 increases, and this tendency is more marked in the case of using argon as the bubble forming gas than the case of oxygen.(3) In the case of argon, the temperature coefficient of the surface tension is negative, but it becomes positive in the case of oxygen.
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