影响LAS系微晶玻璃密度和热膨胀系数的工艺制度研究  

The Influence of Heat Treatment on the Density and Coefficient of Thermal Expansion of Li_2O-Al_2O_3-SiO_2 System Glass-ceramics

作　　者：裘慧广[1] 程金树[1] 汤李缨[1] 谢俊[1] 孙江美[2] 

机构地区：[1]武汉理工大学硅酸盐材料工程教育部重点实验室,湖北武汉430070 [2]安阳钢铁股份有限公司,河南安阳455004

出　　处：《玻璃与搪瓷》2007年第5期1-6,15,共7页Glass & Enamel

摘　　要：以SiO2、Al2O3、Li2CO3为主要原料，通过加入少量碱土金属氧化物、澄清剂及TiO2和ZrO2成核剂，首先在1580℃熔制玻璃，然后依据差热分析所确定的热处理制度，在不同温度和时间条件下对其进行核化和晶化处理，制得低膨胀Li2O-A12O3-SiO2系透明微晶玻璃。结果表明：试样的热膨胀系数随核化温度或晶化温度的升高、核化时间或晶化时间的延长呈先降低后升高的变化规律，此变化的规律性与试样的密度成相反的变化规律。在550℃核化2h，880℃晶化1h的条件下制得的Li2O-Al2O3-SiO2系微晶玻璃结构致密，晶粒细小均匀，主晶相为β-石英固溶体，外观完全透明，热膨胀系数为2．262×10^-7／℃（0～900℃），密度为2．5g／cm^3。Transparent Li2O- Al2O3 -SiO2 system glass -ceramics with low expansion were prepared by using SiO2, Al2O3, Li2CO3 as basic raw materials, adding a small amount of alkali earth, and also adding TiO2, ZrO2 as nucleating agent and melted at 1 580 ℃. The glass - ceramics were nucleated and crystallized at different temperature and for different time depending on the DTA data. The results show that the coefficient of thermal expansion of the samples rises first, and then decreases with increasing nucleation temperature, nucleation time, crystallization temperature or crystallization time, while the density of samptes changes on contrary. The glass - ceramics of Li2O - Al2O3 - SiO2 system could be obtained by nucleating at 550 ℃ for 2h and crystallizing at 880 ℃ for lh. This glass - ceramics was fully desified. The crystal size in the glass -ceramics was small and homogenous, and itsmain crystalline phase was β- quartz solid solution. The expansion coefficient of the glass - ceramics was 2. 262 × 10^-7/℃ （0 -900℃ ）and the density was 2.5 g/cm^3.

关 键 词：Li2O-A12O3-SiO2 微晶玻璃 密度 低膨胀 

分 类 号：TQ171.112[化学工程—玻璃工业]