析晶温度对低膨胀LAS微晶玻璃的影响  

Effect of Crystallization Temperature on LAS Glass-Ceramics with Low Expansion

作　　者：何峰[1] 陈美桃 施江[1] 张文涛[1] 万鹏 郭子琛 谢峻林[1] 李凤祥[1] HE Feng;CHEN Meitao;SHI Jiang;ZHANG Wentao;WAN Peng;GUO Zichen;XIE Junlin;LI Fengxiang(State Key Laboratory of Silicate Materials for Architecture,Wuhan University of Technology,Wuhan 430070,China;Foshan Shunde Media Electric Appliances Manufacturing Company,Foshan 528311,China)

机构地区：[1]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070 [2]佛山市顺德区美的电热电器制造有限公司,佛山528311

出　　处：《硅酸盐通报》2020年第2期592-600,611,共10页Bulletin of the Chinese Ceramic Society

基　　金：中央高校基本科研业务费资助(2019-zy-021)。

摘　　要：以Li2O-Al2O3-SiO2(LAS)系统微晶玻璃为研究对象,探究低Li2O掺量(4.13wt%)时析晶温度对微晶玻璃的影响,成功制备出超低热膨胀系数的微晶玻璃。利用XRD、DSC、FTIR、SEM研究了微晶玻璃内部的晶相组成、显微结构。结果表明:在Li2O含量为4.13wt%时,随着析晶温度的提高,平均热膨胀系数(CTE)呈现逐渐增加的趋势,而抗折强度和显微硬度也呈现逐渐增大的趋势。综合分析最佳析晶温度为800℃,此时微晶玻璃的热膨胀系数最小且均为负值,30~300℃、30~400℃、30~500℃温度段的平均CTE值分别为-4.216×10-7/℃、-2.500×10-7/℃、-0.931×10-7/℃。The glass-ceramics of Li2O-Al2O3-SiO2(LAS) system were studied. The effect of crystallization temperature on the glass-ceramics was investigated. The ultra-low CTE of glass-ceramics was successfully prepared. The crystal phase composition and microstructure of the glass-ceramics were studied by XRD, DSC, FTIR and SEM. The results show that when the content of Li2O is 4.13 wt%, the average CTE increases with the increase of crystallization temperature, and the flexural strength and microhardness also tend to increase. The best crystallization temperature is 800 ℃. The CTE of glass-ceramics is the smallest and negative. The average CTE values of 30-300 ℃, 30-400 ℃, 30-500 ℃ are-4.216×10-7/℃,-2.500×10-7/℃,-0.931×10-7/℃, respectively.

关 键 词：β-石英固溶体 微晶玻璃 低膨胀 析晶温度 

分 类 号：TQ171.72[化学工程—玻璃工业]