Study on Effect of TiO2 on Physicochemical Properties of Mold Fluxes Containing Fluorine

摘要

The physicochemical properties of the mold fluxes containing fluorine were investigated in this study by means of measuring viscosity, melting temperature, breaking temperature and crystallizing characteristic etc., and analyzing the radiative heat transfer through mold fluxes films. The results indicated that TiO2 could reduce viscosity and breaking temperature of mold fluxes;addition of TiO2 less than 6% could decrease melting temperature of mold fluxes. However, excessive TiO2 addition would make an opposite effect. XRD results indicated that Ca2SiO4, CaAl2Si2O8 and CaTiO3 were precipitated in the mold fluxes films. Amount of cuspidine precipitated decreased. With TiO2 added, crystallizing temperature of mold fluxes decreased, and reached the bottom when TiO2 addition is 6%. Further more, TiO2 was proved to have a negative effect on radiative heat transfer through mold fluxes films. While TiO2 content added to 8%, radiation heat flux decreased from 5.5×104Wm-2 to 3.9×104Wm-2, decrement reached 30%.