LAUSR

In the steel industry, the interface tension of slag-metal and the surface tension of slag are important parameters in the gas-slag-metal interface behavior.1–4) They affect the interfacial reaction, the separation of molten slag and molten metal, the discharge of inclusions in molten iron and molten steel, the formation of new phase nuclei in the reaction, and the behavior of bubbles in slags. In addition, the study of slag-metal interfacial tension and slag surface tension are also of great significance for the study of interfacial reaction mechanism and phase interface structure.5–7) At present, the common testing methods of slag interface property include the maximum bubble method,8) the sessile drop method,9) and the pendant drop method.10) Boni and Derge11) introduced the maximum bubble method into the surface tension test of high temperature melts in 1917. The maximum bubble method needs not to measure the contact angle and has high accuracy. So it is often used for dynamic measurement of surface tension of high temperature melts. The sessile drop method was invented by Quincke.12) This method obtains the surface tension and the interfacial tension according to the droplet shape on the horizontal gasket. Fujii et al.13) pointed out that due to the small size of sample and the unrestricted sample, the sessile drop method is widely used in melt surface tension testing in many fields. Novel Method for Determining the Interfacial Properties of Melt Slags Based on Single Hot Thermocouple Technique