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Sintering-viscosity relation for mixed-alkali glass powder compacts

Published online by Cambridge University Press:  03 March 2011

Ki-Dong Kim
Ki-Dong Kim*
Affiliation:
Rheinisch-Westfälische Technische Hochschule (RWTH), Institut für Gesteinshüttenkunde, Mauerstr. 5, D-52064 Aachen. Germany
*
a)Present address: Samsung-Corning Co., R&D Center, 445-970 Suwon, Korea.
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Abstract

The sintering of glass powder compacts was studied by dilatometer in the (25 - x) Na2O–xK2O–75SiO2 glass system. The dilatometrically determined sintering temperature (Tsin) at constant heating rate decreases and the shrinkage at isothermal sintering increases when Na2O is replaced by K2O up to the mole fraction of K2O/(Na2O + K2O) = 0.5. This is due to the decrease in viscosity and means that sintering can be possibly accelereted by introduction of mixed alkali oxides in this system. According to calculation using the VFT-equation, the viscosity value at Tsin is almost independent of glass composition. From these results it may be supposed that the dilatometrically determined sintering begin temperature (Tsin) can be a characteristic point for the sintering of glass.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 7 , July 1995 , pp. 1846 - 1849
Copyright
Copyright © Materials Research Society 1995

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