Viscosity Of The Glass Forming Melts In The 15Na2O.10(Mgo, Cao, Tio, Tio2, Zro2). 75Si02 System

The viscosity-temperature-composition dependence of the glass forming melts studied was well described by the Vogel-Fulcher-Tammann equation with A, B, To coefficients expressed in the form of mixed quadratic polynomials of individual mole fractions of oxides. Only the statistically significant terms were retained in these functions. Analysis of the proposed regression function shows the predominant influence of ZrO2 that enhances both the viscosity and the viscous flow actiavation energy.