玻璃组成对Li_2O–Al_2O_3–SiO_2微晶玻璃热膨胀系数的影响(英文)  

INFLUENCE OF COMPOSITION ON THE COEFFICIENT OF THERMAL EXPANSION OF Li_2O-Al_2O_3-SiO_2 GLASS-CERAMIC

作　　者：蒲永平[1,2] 许宁[2] 吴胜红 

机构地区：[1]教育部轻化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 [3]东莞市泰阳电子有限公司,广东东莞523000

出　　处：《硅酸盐学报》2009年第5期738-742,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(50607013);陕西省教育厅科研专项基金(08KJ222)资助项目

摘　　要：通过传统熔融法制备了具有低膨胀系数的Li2O-Al2O3-SiO2(LAS)微晶玻璃。利用扫描电镜、X射线衍射、差热分折及热膨胀系数测定等分析手段,研究了玻璃组成中Li2O,Al2O3,SiO2的含量对微晶玻璃热膨胀系数的影响。结果表明:在标准样品的基础上,Li2O的含量对热膨胀系数影响很大;Li2O的含量提高,由于形成β-锂辉石,微晶玻璃的结晶程度增加与晶粒尺寸增大,导致热膨胀系数增大。与此相比较,Al2O3和SiO2成分的变化对膨胀系数的影响较小。当玻璃组成(质量分数,下同)为 4%～6% Li2O,16%～18% Al2O3,66%～68% SiO2时,Li2O-Al2O3-SiO2玻璃的膨胀系数为-1.5～1.5 × 10-7/℃(0～700 ℃ )Li2O-Al2O3-SiO2 （LAS） system glass-ceramics were prepared by the conventional melting method. The influences of the contents of Li2O, Al2O3 and SiO2 on the coefficient of thermal expansion （CTE） of the glass-ceramic were investigated by scanning electronic microscopy, X-ray diffraction and differential thermal analysis. The results show that the content of Li2O plays a predominant role in the CTE of the glass-ceramic. The CTE increases obviously with the increase of Li2O content due to the formation of β-spodumene and as a result, the crystal size and crystallinity in the LAS glass increase, Comparatively, the influence of the contents of SiO2 and Al2O3 on CTE is weaker. The Li2O-Al2O3-SiO2 glass-ceramics with a basic composition （in mass）, 4%--6% Li2O, 16%-18% Al2O3 and 66%-58% SiO2. have a CTE range from -1.5 × 10^-7 to 1.5× 10-7/℃（0～700 ℃ ）

关 键 词：氧化锂-氧化铝-氧化硅系统 微晶玻璃 组成 热膨胀系数 

分 类 号：TQ171[化学工程—玻璃工业]