Newly Developed Noncontact AC Calorimetry of Molten Silicon in a Static Magnetic Field

Abstract

For the purpose of developing a new method to measure the thermophysical properties such as heat capacity, thermal conductivity and emissivity of high-temperature metallic melts, the experimental principle of the noncontact laser AC calorimetry has been established. An electromagnetic levitator incorporating a static magnetic field was used for the AC calorimetry. The convection in the silicon droplet is effectively suppressed by the Lorentz force caused by the interaction between the silicon melt and static magnetic field, which makes it possible to measure the true thermal conductivity of the melt. The convection in the levitated liquid silicon becomes negligible above 2 T.