Viscosity profiles of phosphate glasses through combined quasi-static and bob-in-cup methods

Parsons, A.J. and Sharmin, N. and Syed Shaharuddin, Sharifah Imihezri and Marshall, M. (2015) Viscosity profiles of phosphate glasses through combined quasi-static and bob-in-cup methods. Journal of Non-Crystalline Solids, 408. pp. 76-86. ISSN 0022-3093

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Abstract

This study used a combined viscosity approach to determine theoretical fibre drawing points for glasses in the series: xP2O5, 24MgO, 16CaO, (60-x)Na2O (x = 0,45,50,55) and yP2O5, 24MgO, 16CaO, (55-y)Na2O, 5Fe2O3 (y = 40,45,50,55). The points cannot be measured directly since the glasses are only kinetically stable at these points and would crystallise if allowed to equilibrate. Quasi-static and bob-in-cup viscosity data from above and below the range of interest were fitted to the Vogel–Fulcher–Tammann equation and provided good agreement. The theoretical drawing points were taken as the temperature at which the glass has a viscosity of 2 Log Pa·s, based on the known drawing point viscosity of silica glasses. The theoretical drawing points for the glasses ranged from 657 to 839 °C. The viscosity information was also used to assess the fragility of the glasses in comparison with a borosilicate standard by using Doremus and Angell parameters. All of the glasses were of low viscosity and high fragility in comparison to the borosilicate. The fragility improved above 50% content of phosphate in the glass and the addition of iron had little effect on the fragility. Additionally, the limitations of the borosilicate 717a standard glass and the measurement of Tg are discussed.

Item Type:	Article (Journal)
Additional Information:	4586/48552
Uncontrolled Keywords:	Phosphate glass,viscosity, Vogel–Fulcher–Tammann,fragility
Subjects:	T Technology > T Technology (General) T Technology > TP Chemical technology > TP248.13 Biotechnology T Technology > TP Chemical technology > TP785 Clay industries. Ceramics. Glass. Cement industries
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Manufacturing and Materials Engineering
Depositing User:	Internatio Sharifah Imihezri Syed
Date Deposited:	25 Feb 2016 09:33
Last Modified:	25 Feb 2016 09:33
URI:	http://irep.iium.edu.my/id/eprint/48552

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