(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083;
2. 中南大學(xué) 有色金屬材料科學(xué)與工程教育部重點實驗室，長沙 410083)
摘 要: 制備了Yb3+摻雜的Na2O-CaO-SiO2系高結(jié)晶度、透明微晶玻璃。用差熱分析(DSC)初步確定基礎(chǔ)玻璃的核化及晶化溫度范圍，用X射線衍射(XRD)測定微晶玻璃析出晶相，用掃描電鏡(SEM)研究微晶玻璃的微觀結(jié)構(gòu)。結(jié)果表明：組成為53SiO2-30CaO-17Na2O(摩爾分?jǐn)?shù)，%)的基礎(chǔ)玻璃經(jīng)熱處理析出了Na4Ca4Si6O18晶相；合適熱處理制度為：595 ℃核化5 h，730 ℃晶化1 h；所制備的微晶玻璃析晶度高，晶粒尺寸約100 μm，微晶玻璃仍具有較高的透明度。
關(guān)鍵字: 鈉鈣硅酸鹽；玻璃陶瓷；熱處理制度；析晶度；微觀結(jié)構(gòu)
（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
