Density, Surface Tension and Electrical Conductivity of Calcium Fluoride Based Fluxes for Electroslag Remelting

Abstract

The density, surface tension and electrical conductivity of calcium fluoride bearingfluxes and interfacial tension between iron alloys and those fluxes were measured at molten state.
From the results, especially from the change of molar volume, the behaviour of alumina and lime added to molten calcium fluoride is discussed and the dissociation mechanism of aluminate by fluorine is proposed as follows; fiuorine added to CaO-Al2O3 melt, firstly, changes the (O^-……Ca²⁺……O^-) bond to the (O^-…Ca²⁺……F^-) bond and when the process is completed, the fluorine begins to attack the aluminate complex and changes gradually aluminate complex to the smallest aluminium-oxyfluouride such as AlO₂F^2-or AlOF^2-.