Crystallization Kinetics and Microhardness of MgO–Al2O3–SiO2 Glass Ceramics with Low Melting Temperature

Qiang Lu; Shu Jiang Liu

doi:10.4028/www.scientific.net/AMR.1023.39

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 1023Crystallization Kinetics and Microhardness of...

Crystallization Kinetics and Microhardness of MgO–Al₂O₃–SiO₂ Glass Ceramics with Low Melting Temperature

Abstract:

The authors report a deferential scanning calorimetric study of MgO–Al₂O₃–SiO₂ glasses which possess low melting temperature due to introduction of some quantity of B₂O₃, Li₂O and CaF₂. It is shown that the content of Li₂O has a strong impact on the overlapping extent of the rates of nucleation and crystal growth. High-quartz tends to precipitate at low temperature (~1173 K) for the studied glasses, irrespective of Li₂O content. With increasing annealing temperature, spodumene and cordierite form as main crystalline phase for the samples with high and low Li₂O content, respectively, and then cristobalite crystals occur for both glass compositions. Microhardness firstly increases and then decreases, depending on crystalline phase sequence, and a maximum microhardness value is obtained to be 10.5 GPa.