The mixed-alkali effect for the viscosity is shown to be caused mainly not by alkali-alkali but by non-linear alkali-silica interactions.ĭownload viscosity calculator, including correlation matrices, 1.7 MBĬomparison to other glass viscosity models The prediction confidence interval largely depends on the glass composition of interest, the composition uncertainty, and the viscosity level. The developed global model corrects those errors. Similarly, in the glass transition range many experimental data of borosilicate glasses are reported too high due to phase separation effects. and the recently published "High temperature glass melt property database for process modeling" by Seward et al.
#Compositions calculator series#
It is shown that within a measurement series from a specific laboratory the reported viscosity values are often over-estimated at higher temperatures due to evaporation losses during the measurement and glass preparation, including data by Lakatos et al.
"Glass Viscosity Calculation Based on a Global Statistical Modeling Approach" ( PDF, 3 MB) Ī global statistical glass viscosity model was developed for predicting the complete viscosity curve, based on more than 2200 composition-viscosity data of silicate glasses from the scientific literature, including soda-lime-silica container and float glasses, TV panel glasses, borosilicate fiber wool and E type glasses, low expansion borosilicate glasses, glasses for nuclear waste vitrification, lead crystal glasses, binary alkali silicates, and various further compositions from over half a century. Viscosity calculation based on 2200 experimental data:
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