利用正交法优化掺杂La_2O_3微晶玻璃的热处理制度  

Optimization of Heat Treatment Schedule for Li_2O-Al_2O_3-SiO_2 System Glass-ceramics Doped with Rare Earth

作　　者：李宏[1] 郑勇[1] 程金树[1] 

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,武汉市430070

出　　处：《玻璃》2007年第3期9-11,45,共4页Glass

摘　　要：实验在前期研究工作基础上选择了稀土氧化物La2O3，采取外加法对Li2O-Al2O3-SiO2（LAS）系统微晶玻璃进行掺杂，为了寻找掺杂La2O3后LAS系统微晶玻璃的最佳热处理制度，采用正交试验设计，对试样在不同温度下进行了热处理，并对晶化后各试样进行了各项性能测试并对测试结果进行了分析，结果表明：热处理制度对微晶玻璃的各项性能影响显著，其中又以晶化温度的影响最大；综合各项性能后，得到合适热处理制度为590℃／1h→790℃／2h，此时，试样的力学性能和热膨胀性能最好，其抗折强度为141MPa，热膨胀系数为1．26×10^-7℃。（20～400℃）。The research object is Li2O-Al2O3-SiO2 system glass-ceramics. According to Li2O-Al2O3- SiO2 system glass phase diagram, a set of compositions were designed, and La2O3 was doped as extra ingredient, then the glass-ceramics is fused through orthogonal experiment design and the performances of final glass-ceramics were characterized . The results indicate that the temperature affects performance most. It is concluded that the optimum heat treatment schedule is 590℃/1h→ 790℃/2h at which the mechanical and thermal performances get best , the rupture strength is 141 Mpa and the linear thermal expansion coefficient is 1.26 × 10^-7℃^-1 （ 20℃～ 400℃） with 0.5% La2O3 addition .

关 键 词：LI2O-AL2O3-SIO2 微晶玻璃 LA2O3 稀土氧化物 热处理制度 正交试验设计 

分 类 号：TQ171[化学工程—玻璃工业]