Abstract
Knowledge of phase equilibria in the Na2O–SiO2 system at elevated temperatures is important for mastering the metallurgical process and for the glass and ceramic industries. The phase diagram at metasilicate and silica saturations in the Na2O–SiO2 system between 1173 and 1873 K has been investigated by quenching and phase analyses. The experimental technique involved equilibration of high purity oxide mixtures at sub-liquidus temperatures, rapid quenching in cold water and followed by compositional measurement of the phases using electron probe X-ray microanalyser. The phases stable in the equilibrium assemblages have been characterised over a wide range of compositions and temperatures. The results were compared with previous experimental data and an optimised phase diagram.
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