Analysis of Regularities in Composition Dependence of the Viscosity for Glass-Forming Oxide Melts: II. Viscosity of Ternary Alkali Aluminosilicate Melts

Authors: Leko V.K.¹; Mazurin O.V.²

Source: Glass Physics and Chemistry, Volume 29, Number 1, January 2003 , pp. 16-27(12)

Publisher: MAIK Nauka/Interperiodica

Abstract:

The data available in the literature on the viscosity of alkali aluminosilicate melts are collected and analyzed using the SciGlass information system. It is established that there are two composition regions in which the composition dependences of the viscosity logarithm at a constant temperature (above 1000°C) are adequately described by linear equations. The largest amount of data is available for the composition region with an alkali oxide concentration exceeding the aluminum oxide concentration ([R₂O] > [Al₂O₃]). In this region, the viscosity of melts is predominantly affected by two factors, namely, the concentration of alkali oxide uncombined into the alkali aluminate complex and the nature of alkali cations. At a constant concentration of unbound alkali oxide, the replacement of SiO₂ by AlRO₂ is accompanied by a noticeable decrease in the viscosity of lithium aluminosilicate melts, a very weak decrease in the viscosity of sodium aluminosilicate melts, and a considerable increase in the viscosity of potassium aluminosilicate melts. In the second composition region ([R₂O] < [Al₂O₃ ]), the replacement of SiO₂ by AlO_1.5 at a constant alkali metal content is attended by a decrease in the viscosity. In this region, the viscosity increases when changing over from Li₂O to K₂O upon complete substitution of one alkali oxide for another. Different variants of structural interpretation of the regularities revealed are discussed.

Language: English

Document Type: Research article

Affiliations: 1: AOZT Thermex, Srednii pr. 86, St. Petersburg, 199106 Russia 2: Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, ul. Odoevskogo 24/2, St. Petersburg, 199155 Russia

Publication date: 2003-01-01

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• In this Subject: Chemical Engineering
• By this author: Leko V.K. ;  Mazurin O.V.

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