Effects of Zirconia Content and Heating Rate on Crystallization Behavior of LAS Transparent Glass Ceramics

Abstract

Abstract: Li₂O-Al₂O₃-SiO₂ (LAS) system high crystallinity transparent glass ceramics with different ZrO₂ content were prepared by conventional melt quenching and two-step crystallization approaches. The crystallization kinetics, phase evolution, structure and light transmittance of LAS glass ceramics were studied. The results show that when the content of ZrO₂ increases to a certain amount, the crystallization mode of glass gradually changes from one-dimensional growth to two-dimensional growth, and its crystallization exothermic peak T_p value gradually increases, while its crystallization activation energy gradually decreases. In the process of crystal phase transformation, the glass precipitated crystal phases include lithium silicate (Li₂SiO₃) crystal, lithium permeating feldspar (LiAlSi₄O₁₀) crystal and lithium disilicate (Li₂Si₂O₅) crystal. It is found that when lithium silicate (Li₂SiO₃) crystal is transformed into lithium disilicate (Li₂Si₂O₅) crystal, the transmittance of glass increases. In additions, SEM results show that with the decrease of heating rate, the crystal size of glass precipitation gradually increases, and the crystal morphology is mainly spherical.

Key words: transparent glass ceramics, cover glass, crystal transformation, optical characteristic, crystallization behavior

CLC Number:

TQ171

HU Wei, YIN Yongming, MENG Hong. Effects of Zirconia Content and Heating Rate on Crystallization Behavior of LAS Transparent Glass Ceramics[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(6): 2215-2222.

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