Viscosities of Na{sub}2O-SiO{sub}2-B{sub}2O{sub}3 ternary melts

摘要

Sodium borosilicate is the basic composition of coating materials, Vycor and Pyrex glasses. In the present study, viscosities of Na{sub}2O-SiO{sub}2-B{sub}2O{sub}3 ternary melts were measured under various compositions and temperatures.Experiments were carried out using rotary viscometer and graphite components. Our experimental results were compared with those in literature. Based on present experimental results, the previous structure based viscosity model was modified. The predictedviscosity results are in excellent agreement with the present experimental data in the temperature range with molten state samples. The fitting ranges of the model cover the composition of x{sub}(B{sub}2O{sub}3) from 0.1 to 0.6 combined withx{sub}(SiO{sub}2)/x{sub}(Na{sub}2O)= 0.5, 1, 2 and 5 respectively.