MgO,ZnO和BaO对Li_2O–Al_2O_3–SiO_2微晶玻璃结晶化和 热膨胀性能的影响(英文)  

CRYSTALLIZATION AND THERMAL EXPANSION OF Li_2O-Al_2O_3-SiO_2 GLASS-CERAMICS WITH MgO,ZnO AND BaO ADDITIVES

作　　者：毛玉琴[1] 蒲永平[1,2] 韦继锋[2] 王瑾菲[2] 

机构地区：[1]教育部轻工助剂化学与技术重点实验室 [2]陕西科技大学材料科学与工程学院,西安710021

出　　处：《硅酸盐学报》2009年第5期733-737,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(50607013);陕西省教育基金(08KJ222);陕西科技大学研究生创新基金资助项目~~

摘　　要：通过传统熔融法制备了添加MgO,ZnO和BaO的Li2O-Al2O3-SiO2(LAS)微晶玻璃。并通过微分热分析、X射线衍射和扫描电镜研究了MgO,ZnO和BaO对LAS玻璃的结晶化影响,测量了LAS的热膨胀系数(coefficient of thermal expansion,CTE)。结果表明:添加1.0%～1.5%(质量分数,下同)MgO,1.0%～3.0%ZnO或1.5%～3.5%BaO的LAS微晶玻璃在500℃以下都表现出负的热膨胀性。随着MgO含量的减少,形成了β锂辉石固溶体(LiAlSi3O8)并导致CTE显著增大。当添加0.5%MgO时,从100～700℃具有0.5120×10-6/℃到1.6913×10-6/℃的正膨胀系数。Li2O-Al2O3-SiO2 （LAS） glass-ceramics with MgO, ZnO and BaO additives were prepared by a conventional melting technique. The effects of MgO, ZnO and BaO on the crystallization of LAS glass were investigated by differential thermal analysis, X-ray diffraction and scanning electron microscopy. The coefficient of thermal expansion （CTE） was measured by thermo-mechanical analyzer. The results show that the LAS glass-ceramics with the addition of 1.0%-1.5% （in mass, the same below） MgO, 1.0%-3.0% ZnO or 1.5%-3.5% BaO have negative thermal expansion below the temperature 500 ℃. β-spodumene solid solution （LiAlSi3O8） forms with the decreasing of MgO content and as a result of the considerable increase of CTE. The LAS glass-ceramics with the addition of 0.5% MgO possesses a positive CTE range from 0.512 0 ×10^-6/℃ to 1.691 3×10^-6/℃ at 100-700 ℃.

关 键 词：氧化锂-氧化铝-氧化硅 热膨胀 微晶玻璃 

分 类 号：TQ171[化学工程—玻璃工业]