Abstract
AbstractThe effect of the substitution of Al2O3 for the oxides of sodium, calcium, and silicon on the liquidus temperatures and phase relations has been determined for glasses lying within the composition range Na2O 11 to 19%, CaO 6 to 18%, SiO2 59 to 79%, and Al2O3 0 to 8%. The results on 137 individual determinations show that the substitution of Al2O3 for CaO permits wollastonite to be the primary phase in glasses of relatively low CaO content. As the Al2O3 content increases, the Na2O‐3CaO‐6SiO2—CaO·SiO2 boundary shifts to lower CaO contents, and the decomposition of Na2O·3CaO·6SiO2 to CaO·‐SiO2 takes place at lower temperatures. In compositions with tridymite as a primary phase, the substitution of Al2O3 for SiO2 is effective in lowering the liquidus temperature. For the composition range investigated, the SiO2‐CaO‐SiO2 and Na2O·3CaO·6SiO2‐SiO2 boundary remains at essentially the same SiO2 content for all glasses containing not more than 4% Al2O3.
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