The thermal conductivity of slags used in electroslag remelting

Measurements of thermal diffusivities of solid ESR slags from the system CaF₂ + Al₂O₃ + CaO for temperatures between 200 and 1200°C using laser flash method. Thermal conductivities derived from these data. In the polycrystalline specimens used in this study the radiation conduction is shown to be negligible, heat transfer occurs predominantly by phonon conduction. An appreciable contribution to the thermal conductivity arises from gaseous conduction across pores and microcracks in the specimen. Thermal conductivity decreases with decreasing CaF₂ content.