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Abstract

A model is developed to estimate the viscosity of aluminosilicate melts containing CaF₂, in which the influence of chemical composition is expressed by different types of oxygen ions and CaF₂ clusters. In this study, CaF₂ is assumed to have no effect on the relative amounts of different structures Q ⁱ (i = 0–4) (where the superscript refers to the number of bridging oxygen in a given structural unit), but only acts as a diluter. The viscosity model can be well applied to CaO–FeO–CaF₂–SiO₂, CaO–Al₂O₃–CaF₂–SiO₂, CaO–Na₂O–CaF₂–SiO₂ and CaO–FeO–CaF₂–Al₂O₃–SiO₂ melts. From the isoviscosity curves of the CaO–CaF₂–SiO₂ system plotted by the present model, it can be concluded that the substitution of CaF₂ for CaO makes the viscosity decrease in an acidic composition area but almost keeps constant in the basic composition area.

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Influence of CaF 2 on viscosity of aluminosilicate melts

Abstract

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