Study of the Conduction Mechanism of Molten Fluxes for Electroslag Remelting

Abstract

Electrical conductivities of CaF₂-based fluxes for electroslag remelting were measured and the effects of the additions on the conductivity of CaF₂ melt were studied. From the results, conduction mechanism of CaF₂-based melts were discussed in the term of molar conductivity. The additions of alkali earth metal fluorides and oxides, such as MgF₂, BaF₂, MgO, CaO and BaO, varied the molar conductivities of CaF₂-based melts in accordance with the intensity of cation-anion attraction. It seems that those additions have a tendency to make an ionic pair in the melts. The additions such as Al₂O₃, TiO₂ and ZrO₂, may react with fluorine ions to make oxy-fluoride complex ions and then remarkable decreace of electrical conductivity by those additions can be explained.