氧化锆含量及热处理升温速率对LAS透明微晶玻璃析晶行为的影响  

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

作　　者：胡伟 尹勇明 孟鸿 HU Wei;YIN Yongming;MENG Hong(School of Advanced Materials,Shenzhen Graduate School,Peking University,Shenzhen 518055,China;Shenzhen Donglihua Technology Co.,Ltd.,Shenzhen 518109,China)

机构地区：[1]北京大学深圳研究生院新材料学院,深圳518055 [2]深圳市东丽华科技有限公司,深圳518109

出　　处：《硅酸盐通报》2023年第6期2215-2222,共8页Bulletin of the Chinese Ceramic Society

摘　　要：采用常规熔融退火和两步结晶法制备了具有不同ZrO_(2)含量的Li_(2)O-Al_(2)O_(3)-SiO_(2)(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,ZrO_(2)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T_(p)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(Li_(2)SiO_(3))、透锂长石(LiAlSi_(4)O_(10))和二硅酸锂(Li_(2)Si_(2)O_(5))晶体的析出,并且发现晶体由硅酸锂(Li_(2)SiO_(3))向二硅酸锂(Li_(2)Si_(2)O_(5))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。Li_(2)O-Al_(2)O_(3)-SiO_(2)(LAS) system high crystallinity transparent glass ceramics with different ZrO_(2) 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 ZrO_(2) 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(Li_(2)SiO_(3)) crystal,lithium permeating feldspar(LiAlSi_(4)O_(10)) crystal and lithium disilicate(Li_(2)Si_(2)O_5) crystal.It is found that when lithium silicate(Li_(2)SiO_(3)) crystal is transformed into lithium disilicate(Li_(2)Si_(2)O_5) 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.

关 键 词：透明微晶玻璃 盖板玻璃 晶相转变 光学性能 析晶行为 

分 类 号：TQ171[化学工程—玻璃工业]