Estimation of liquidus temperatures in silicate glasses

Abstract

Two models for estimating liquidus temperature from composition are presented and compared with thermodynamically calculated temperature as well as primary phase. A simple polynomial model is given for high silica glasses, while a model covering a wide composition range and several primary phase fields is more complex. Thermodynamic calculations generally give too high liquidus temperatures in the devitrite field and too low in the primary field for Na2O · 2 CaO · 3 SiO2. In the wollastonite field the values are scattered, but in general too high.