(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)
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100 μm，微晶玻璃仍具有较高的透明度。
关键字: 钠钙硅酸盐；玻璃陶瓷；热处理制度；析晶度；微观结构
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Non-ferrous Metal Materials Science and Engineering, Ministry of Education,
Central South University, Changsha 410083, China）
Abstract: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.
Key words: sodium calcium silicate; glass-ceramics; heat treatment schedule; volume fraction of crystalline phase; microstructure
