Measurement of the Normal Spectral Emissivity of Molten Oxide Using an Electromagnetically Levitated Complex Droplet of Molten Oxide and Liquid Fe

Abstract

We proposed the determination method of the normal spectral emissivity of molten oxides using a combination of immiscible molten oxides and liquid metals. We can determine the normal spectral emissivity of molten oxide from the ratio of the normal spectral radiance of molten oxides andliquid metals, using a commercially available pyrometer combined with an electromagnetic levitation system. In the present study, we measured the normal spectral emissivity of a molten oxide sample from SiO2-CaOFeO (SCF) ternary system and FeO using liquid Fe as the reference liquid metal. The normal spectral emissivity of the molten SCF sample with the composition of SiO2:CaO:FeO = 20:20:60 mass % was determined to be 0.78±0.01 and that of molten FeO to be 0.68 ± 0.03. Based on these results, we have discussed the relationship between the normal spectral emissivity and the electrical conductivity of molten oxides.