Effect of Crystalline Ceramic Oxide on the Densification-Crystallization Behavior of Binary Lithium-Di Silicate Glass Compositions

Abstract

In the present work the crystallization and densification behavior of Lithium-Disilicate (LD) glass compositions were studied with the presence of various nucleating agent and ceramic oxides. A 30 mol% Li2O-70 mol% SiO2 LD system was modified using Al2O3, P2O5 and ZrO2 by keeping SiO2/ Li2O ratio constant at 2.33. The role of 2 to 5 mol% Al2O3, P2O5 and ZrO2 were studied in terms of Differential Scanning Calorimetry, XRD and SEM. The DSC results suggest that glass transition temperature increased with the inclusion of Al2O3 and ZrO2. It is also found that, inclusion of Al2O3 and ZrO2 helped lowering melting temperatures which reduced energy cost for melt processing. The study also suggested that densification was aided by the inclusion of P2O5 and ZrO2. Keywords: Densification; Crystallization; Glass-Ceramics; DSC.