Correlation between Vogel Fulcher Tamman & Avramov Equation for Glass Viscosity

Pattanayak, Pratik (2009) Correlation between Vogel Fulcher Tamman & Avramov Equation for Glass Viscosity. BTech thesis.



Among many equations the VFT and Avramov equations can fit the glass viscosity data ranging from 101 to 1015 poise. The VFT equation needs 3 empirical constants (fitting parameter) to fit the viscosity data over a wide range. Whereas, Avramov equation is based on entropy – temperature correlation. When fitting a particular viscosity data over a wide range of viscosity it has been observed that both equation fall over each other with minimum deviation. So it would be logical to find out some correlation from that characteristic. In the present work an attempt has been made to find the origin of VFT constants by help of Avramov equation. Viscosity data of SiO2 based glass system has been taken in to account to find some correlations.

Item Type:Thesis (BTech)
Uncontrolled Keywords:Glass Viscosity , VFT Equation, Avramov Equation, Fitting Parameters
Subjects:Engineering and Technology > Ceramic Engnieering > Quenching
Engineering and Technology > Ceramic Engnieering > Ceramic Materials
Divisions: Engineering and Technology > Department of Ceramic Engineering
ID Code:1118
Deposited By:Pratik Pattanayak
Deposited On:15 May 2009 15:54
Last Modified:15 May 2009 16:21
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Supervisor(s):Pal, S K

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