ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 53, (2) 141 - 143 (2009)


SURFACE TENSION OF BOROSILICATE MELTS WITH THE COMPOSITION CLOSE TO THE E-GLASS
 
Kraxner Jozef, Liška Marek, Klement Róbert, Chromčíková Mária
 
Vitrum Laugaricio – Joint Glass Centre of the Institute of Inorganic Chemistry, Slovak Academy of Sciences Alexander Dubček University of Trenčín and RONA, a.s., Študentská 2, Trenčín, 911 50, Slovak Republic

Keywords: E-glass, Surface tension, Borosilicate melt, Sessile drop method
 

The composition of the commercially produced E-glass was approximated by the five component system MgO-CaO-B₂O₃-Al₂O₃- SiO₂. Ten additional glass compositions were derived from the mean composition by two-level scheme consisting in shifting the content of each particular oxide of definite positive and negative value preserving the mutual molar ratio of remaining oxides. The surface tension was measured by the sessile drop method using the melt density value obtained by independent experiment. The profile of sessile drop was analyzed by nonlinear regression using the numerical integration of Laplace’s equation. The results were compared with the approximate formula proposed by Dorsey for large drops. The Dorsey’s formula results were about 6% higher than the results of the drop full profile analysis. The additive linear model was proposed describing the compositional dependence of the surface tension with the standard deviation of approximation of 10 mN/m.


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