Li_2O-Al_2O_3-SiO_2系微晶玻璃的制备与准等熵压缩特性  

Preparation of Glass-ceramic of Li_2O-Al_2O_3-SiO_2 System and Characteristic of Quasi-isentropic Compression

作　　者：裘慧广[1] 程金树[1] 沈强[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]武汉理工大学材料复合新技术国家重点实验室,湖北武汉430070

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

摘　　要：以SiO2、Al2O3、Li2CO3为主要原料，加入少量碱土金属氧化物、澄清剂及TiO2、ZrO2成核剂，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-Al2O3-SiO2系透明微晶玻璃。结果表明：在550℃核化2h，880℃晶化1h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。在一级轻气炮上进行击靶实验，利用该微晶玻璃实现了对靶材料的准等熵压缩。By using SiO2, Al2O3, Li2 CO3 as raw materials, adding a small amount of alkaline - earth and refining agent as additives, and TiO2, ZrO2 as nucleating agent, the transparent Li2O-Al2O3-SiO2 system glass -ceramics with low thermal expansion were prepared by melting method. According to DTA data the glass - ceramics were nucleated and crystallized at different temperature and time. The results show that the glass - ceramic of Li2O-Al2O3-SiO2 system can be obtained through nucleating at 550℃ for 2h and crystallizing at 880℃ for I h. Structure of this glass - ceramic was completely densified. The Crystal size in this glass -ceramic was small and homogenous, and its predominant crystalline phase was β - quartz. The thermal expansion coefficient of the glass - ceramic was 2. 262 × 10^-7/℃ （0 - 900℃） and the density was 2. 5 g/cm^3. The quasi - isentropic experiments were performed on a one- stage light gas gun by using the glass -ceramic.

关 键 词：Li2O-Al2O3-SiO2: 微晶玻璃 低膨胀 透明 准等熵压缩 

分 类 号：TQ171.733[化学工程—玻璃工业]