Details
| Original language | English |
|---|---|
| Pages (from-to) | 223-236 |
| Number of pages | 14 |
| Journal | Journal of non-crystalline solids |
| Volume | 353 |
| Issue number | 3 |
| Early online date | 22 Jan 2007 |
| Publication status | Published - 1 Mar 2007 |
Abstract
Viscosity of water-bearing float glass (0.03-4.87 wt% H2O) was measured in the temperature range of 573-1523 K and pressure range of 50-500 MPa using a parallel plate viscometer in the high viscosity range and the falling sphere method in the low viscosity range. Melt viscosity depends strongly on temperature and water content, but pressure up to 500 MPa has only minor influence. Consistent with previous studies on aluminosilicate compositions we found that the effect of dissolved water is most pronounced at low water content, but it is still noticeable at high water content. A new model for the calculation of the viscosities as a function of temperature and water content is proposed which describes the experimental data with a standard deviation of 0.22 log units. The depression of the glass transition temperature Tg by dissolved water agrees reasonably well with the prediction by the model of Deubener [J. Deubener, R. Müller, H. Behrens, G. Heide, J. Non-Cryst. Solids 330 (2003) 268]. Using water speciation measured by near-infrared spectroscopy we infer that although the effect of OH groups in reducing Tg is larger than that of H2O molecules, the difference in the contribution of both species is smaller than predicted by Deubener et al. (2003). Compared to alkalis and alkaline earth elements the effect of protons on glass fragility is small, mainly because of the relatively low concentration of OH groups (max. 1.5 wt% water dissolved as OH) in the glasses.
Keywords
- Alkali silicates, Fragility, FTIR measurements, Glass transition, Pressure effect, Silicates, Soda-lime-silica, Viscosity, Water in glass
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Materials Science(all)
- Ceramics and Composites
- Physics and Astronomy(all)
- Condensed Matter Physics
- Materials Science(all)
- Materials Chemistry
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: Journal of non-crystalline solids, Vol. 353, No. 3, 01.03.2007, p. 223-236.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Viscosity and glass transition temperature of hydrous float glass
AU - Del Gaudio, P.
AU - Behrens, H.
AU - Deubener, J.
N1 - Funding Information: This work was supported by the German Science foundation, DFG. The authors thank two anonymous reviewers for very constructive comments.
PY - 2007/3/1
Y1 - 2007/3/1
N2 - Viscosity of water-bearing float glass (0.03-4.87 wt% H2O) was measured in the temperature range of 573-1523 K and pressure range of 50-500 MPa using a parallel plate viscometer in the high viscosity range and the falling sphere method in the low viscosity range. Melt viscosity depends strongly on temperature and water content, but pressure up to 500 MPa has only minor influence. Consistent with previous studies on aluminosilicate compositions we found that the effect of dissolved water is most pronounced at low water content, but it is still noticeable at high water content. A new model for the calculation of the viscosities as a function of temperature and water content is proposed which describes the experimental data with a standard deviation of 0.22 log units. The depression of the glass transition temperature Tg by dissolved water agrees reasonably well with the prediction by the model of Deubener [J. Deubener, R. Müller, H. Behrens, G. Heide, J. Non-Cryst. Solids 330 (2003) 268]. Using water speciation measured by near-infrared spectroscopy we infer that although the effect of OH groups in reducing Tg is larger than that of H2O molecules, the difference in the contribution of both species is smaller than predicted by Deubener et al. (2003). Compared to alkalis and alkaline earth elements the effect of protons on glass fragility is small, mainly because of the relatively low concentration of OH groups (max. 1.5 wt% water dissolved as OH) in the glasses.
AB - Viscosity of water-bearing float glass (0.03-4.87 wt% H2O) was measured in the temperature range of 573-1523 K and pressure range of 50-500 MPa using a parallel plate viscometer in the high viscosity range and the falling sphere method in the low viscosity range. Melt viscosity depends strongly on temperature and water content, but pressure up to 500 MPa has only minor influence. Consistent with previous studies on aluminosilicate compositions we found that the effect of dissolved water is most pronounced at low water content, but it is still noticeable at high water content. A new model for the calculation of the viscosities as a function of temperature and water content is proposed which describes the experimental data with a standard deviation of 0.22 log units. The depression of the glass transition temperature Tg by dissolved water agrees reasonably well with the prediction by the model of Deubener [J. Deubener, R. Müller, H. Behrens, G. Heide, J. Non-Cryst. Solids 330 (2003) 268]. Using water speciation measured by near-infrared spectroscopy we infer that although the effect of OH groups in reducing Tg is larger than that of H2O molecules, the difference in the contribution of both species is smaller than predicted by Deubener et al. (2003). Compared to alkalis and alkaline earth elements the effect of protons on glass fragility is small, mainly because of the relatively low concentration of OH groups (max. 1.5 wt% water dissolved as OH) in the glasses.
KW - Alkali silicates
KW - Fragility
KW - FTIR measurements
KW - Glass transition
KW - Pressure effect
KW - Silicates
KW - Soda-lime-silica
KW - Viscosity
KW - Water in glass
UR - http://www.scopus.com/inward/record.url?scp=33846702909&partnerID=8YFLogxK
U2 - 10.1016/j.jnoncrysol.2006.11.009
DO - 10.1016/j.jnoncrysol.2006.11.009
M3 - Article
AN - SCOPUS:33846702909
VL - 353
SP - 223
EP - 236
JO - Journal of non-crystalline solids
JF - Journal of non-crystalline solids
SN - 0022-3093
IS - 3
ER -