Abstract:
In this work, the effect of chemical composition on the liquidus temperature of basaltic glasses within SiO2CaOMgOAl2O3-Fe2O3-Na2O-K2O system for fiber forming were studied by creating a mathematical modeling to predict the liquidus temperature which is depended on glass compositions. A sample of 30 glass formulas was determined its liquidus temperature by DTA and Isothermal technique. The measured liquidus from both techniques were used to create the mathematical model. Glass samples were prepared from the basalt rocks as a major material from Chai Badan, Lopburi, Thailand. Glass formulas were designed by Extreme Vertices Mixture Design. The glass batch was melted at 1450 °C and quenched in the water. The result found that the measured liquidus temperature by DTA and Isothermal have similar value which the coefficient of determination is 0.91. The liquidus temperatures of basaltic glasses were between 1190 to 1360 °C. The crystallization in glasses by heat treatment process could divide the glass sample into 2 groups. The first group is the glass that has diopside as the major crystalline phase and the second is that has albite as same ways. Therefore, the prediction of liquidus temperature with multiple regression analysis was divided into two models according to the major crystalline phase. The comparison of calculated liquidus temperatures from both prediction model showed that the coefficient of determination was between 0.72 - 0.82. Therefore, these prediction models were acceptable to predict the liquidus temperature of this basaltic glass system.