溶鉄-スラッグ間の界面張力

概要

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A method for determining the interfacial tension between the molten iron and the slag was established. It consists of photographing the sessile drop of the molten iron by X-ray, measurement of the dimensions of the drop by means of a microcomparater and calculating the interfacial tension using the Bashforth-Adams table. The drop was placed on the horizontal bottom of an alundum crucible, in which the slag was melted. Values of the interfacial tension of the Hg-H_2O and Hg-benzene systems calculated by this "Sessile drop method" were in agreement with those reported in literatures. Interfacial tensions between liquid Fe-Si alloy (Si 14.34%) and the slag systems Na_2O-SiO_2 and Li_2O-SiO_2 were measured at 1370℃. The values of the interfacial tension were of the order of 1000∿1150 dyne/cm, and decreased with increase of the alkali-metal oxide. It was suggested that Na^+ and Li^+ had the tendency to be adsorbed more easily at the metal-slag interface than silicate anions. Assuming the surface tension of the Fe-Si (Si 14.34%) alloy, it was presumed that the values of the work of adhesion of the present systems were of the order of 500∿700 erg/cm^2, which were approximately in agreement with those of the systems consisting of metals (Ni Fe, Si) and oxide (Al_2O_3), determined by Humenik and Kingery. Furthermore, it was indicated that the work of adhesion increased with enhancement of Na_2O and Li_2O.
社団法人日本鉄鋼協会の論文
1955-05-01