Na_2O-CaO-SiO_2系透明微晶玻璃制备及其微观结构  

Preparation and microstructure of Na_2O-CaO-SiO_2 transparent glass-ceramics

作　　者：梅宇钊[1,2] 陈兴军[1,2] 王克强[1,2] 刘学峰[1,2] 罗志伟[1,2] 卢安贤[1,2] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学有色金属材料科学与工程教育部重点实验室,长沙410083

出　　处：《中国有色金属学报》2012年第7期1991-1997,共7页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51172286)

摘　　要：制备了Yb3+掺杂的Na2O-CaO-SiO2系高结晶度、透明微晶玻璃。用差热分析(DSC)初步确定基础玻璃的核化及晶化温度范围,用X射线衍射(XRD)测定微晶玻璃析出晶相,用扫描电镜(SEM)研究微晶玻璃的微观结构。结果表明:组成为53SiO2-30CaO-17Na2O(摩尔分数,%)的基础玻璃经热处理析出了Na4Ca4Si6O18晶相;合适热处理制度为:595℃核化5 h,730℃晶化1 h;所制备的微晶玻璃析晶度高,晶粒尺寸约100μm,微晶玻璃仍具有较高的透明度。The high crystalline and transparent Yb3＋-doped Na2O-CaO-SiO2 glass-ceramics were prepared.The nucleation and crystallization temperature ranges,crystalline phases in the glass-ceramics and microstructures of the glass-ceramics were observed by DSC curve of the precursor glass,X-ray diffraction and scanning electron microscopy,respectively.The results show that the crystalline phase of Na4Ca4Si6O18 is obtained by heat treatment of precursor glass with composition of 53SiO2-30CaO-17Na2O（mole fraction,%）.And the proper heat treatment schedule is glass nucleated at 595 ℃ for 5 h and crystallized at 730 ℃ for 1 h.Furthermore,the glass-ceramic with grain sizes of about 100 μm is still transparent after crystallization almost completed.

关 键 词：钠钙硅酸盐 玻璃陶瓷 热处理制度 析晶度 微观结构 

分 类 号：TQ171.1[化学工程—玻璃工业]