Journal of the Ceramic Society of Japan
Online ISSN : 1882-1022
Print ISSN : 0914-5400
Evaluation of Critical Cooling Rate for 30Na2O⋅10MgO⋅60SiO2 Glass Based on Viscosity
Shigeki SAKAGUCHIShin-ichi TODOROKI
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1996 Volume 104 Issue 1209 Pages 405-408

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Abstract

The critical cooling rate for 30Na2O⋅10MgO⋅60SiO2 glass, which exhibits low Rayleigh scattering, was evaluated based on viscosity. To this end, the viscosity and thermal expansion coefficient of this glass were measured using a thermomechanical analyzer. The beam bending and parallel plate methods were effective in measuring the viscosities in the range of interest of higher than 104dPa·s. The critical cooling rate was determined as the cooling rate at which the density of the glass melt became identical to that of solid glass at the glass transition temperature when the melt was cooled from the liquidus to the glass transition temperature. The obtained value for this glass was 2.6°C/min.

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