采用常规熔融退火和两步结晶法制备了具有不同ZrO2含量的Li2O-Al2O3-SiO2(LAS)体系的高结晶度透明微晶玻璃。研究了LAS微晶玻璃的结晶动力学、相演变、微观结构和透光性能。结果表明, ZrO2含量增加到一定量时, 玻璃的析晶方式由一维生长逐渐变为二维生长, 其析晶放热峰Tp值逐渐升高, 而析晶活化能逐渐降低。通过控制热处理升温速率可实现玻璃中硅酸锂(Li2SiO3)、透锂长石(LiAlSi4O10)和二硅酸锂(Li2Si2O5)晶体的析出, 并且发现晶体由硅酸锂(Li2SiO3)向二硅酸锂(Li2Si2O5)转变时, 玻璃的透过率会增大。此外, SEM测试结果显示, 随着热处理升温速率的减小, 玻璃析出的晶体尺寸逐渐变大, 晶体形貌主要为球形晶体。

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 Tp 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.