Abstract
A laser flash apparatus has been modified to make thermal conductivity and specific heat measurements possible for slag melts at elevated temperatures. Particular emphasis has been placed to work out a two layer composite cell to avoid convective heat transfer and stably contain the melts during the measurements.
Further, a numerical method has been elaborated to derive the thermal conductivity by comparing observed temperature decay of Pt-plate on the melts in the cell with theoretical prediction of heat transfer equation that involves conductive and radiative component. Separation of the conductive component from radiative one has been shown satisfactory for CaO-SiO2 and CaO-SiO2-Al2O3 melts for which the thermal conductivities, λ, have been determined at 1273 through 1723 K to be
λ=0.51(±0.03)−2.5(±0.2)×10−5T for CaO-45 wt%SiO2
λ=0.60(±0.03)−6.0(±0.2)×10−5T for CaO-35%SiO2-15%Al2O3
\
oindentand λ=0.89(±0.06)−7.6(±0.4)×10−5T for CaO-45%SiO2-20%Al2O3, where λ and T are in unit of J/m·s·K and K, respectively.
