Yoshihiro SAITO

Viscosity Measurement of Alkali Silicate Glass Melts and Analysis of Viscosity - Temperature Relationship

Kazumasa MATUSITA


Newglasses are widely used in advance technology, such as electronic devices. Glass manufacturing is energy consuming processes. It is very important to find optimum conditions of glass melting processes in order to produce high quality glasses and improve efficiency. Viscosity of glass melt is an important factor for glass melting processes.

In this study, viscosity is measured in the wide temperature range (723~1773K) by sphere-moving method with constant velocities and penetration method on various alkali silicate glass systems. Furthermore, temperature and composition dependence of viscosity was discussed.

Viscosity measurement was carried out in the range of log��=-1~11 Pa�Es. Based on the experimental results, temperature dependence of viscosity was analyzed. New viscosity equation log��=A+B/(T-To)+C��/T, adding term of thermal expansion coefficient into Vogel-Fulcher-Tamman equation, was derived. It was found that the new equation agreed with experimental data better than conventional equations.