抄録
We determined the emissivity of molten oxides using a
commercially available pyrometer combined and an electromagnetic
levitation system based on the liquid Fe emissivity and its melting
temperature. Our method for determining molten oxide emissivity is
based on immiscible molten oxides and liquid Fe. From the processes,
we obtained 0.80 0.03 for molten Al2O3 and 0.76 0.01 for our desired
molten oxide of SiO2-CaO-Mn3O4-TiO2 system with welding flux
model compositions of SiO2:CaO:Mn3O4:TiO2=27:7:13:53 mass% . This
is necessary when using ELF (electrostatic levitation furnace) in the
ISS (International Space Station) to measure the thermophysical properties
of molten oxides. We could correct the temperature monitored
with emissivity set at 1 to the real temperature during density measurement by ELF in ISS using normal spectral
emissivity for molten SiO2-CaO-Mn3O4-TiO2 system and we find the temperature dependence of molten oxides density
of SiO2:CaO:Mn3O4:TiO2=27:7:13:53 mass% in the temperature range of 1200K - 2000K. We also find that the
multicomponent oxide system of SiO2-CaO-Mn3O4-TiO2 has a low coefficient of density temperature dependence.
