Na2O-CaO-SiO2系透明微晶玻璃制备及其微观结构

来源期刊:中国有色金属学报2012年第7期

论文作者:梅宇钊 陈兴军 王克强 刘学峰 罗志伟 卢安贤

文章页码:1991 - 1997

关键词:钠钙硅酸盐;玻璃陶瓷;热处理制度;析晶度;微观结构

Key words:sodium calcium silicate; glass-ceramics; heat treatment schedule; volume fraction of crystalline phase; microstructure

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。

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.

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