(1. 廣西大學 化學化工學院, 南寧 530004;
2. 武漢工業(yè)大學 材料科學與工程學院, 武漢 430070)
摘 要: 利用差熱分析(DTA)、 紅外吸收光譜(IR)、X射線衍射(XRD)和掃描電鏡(SEM)等手段研究了SiO2-Al2O3-CaO-Fe2O3系微晶玻璃晶化過程及其結(jié)晶動力學。結(jié)果表明： SiO2-Al2O3-CaO-Fe2O3系微晶玻璃晶化過程中，初晶相是鈣鐵透輝石, 鈣鋁黃長石是中間過渡相且隨晶化溫度的提高而消失, 最終晶相只有鈣鐵透輝石；晶體生長指數(shù)為2.9, 屬三維生長。 玻璃網(wǎng)絡中主要有SiO4, AlO4及Fe3+O4四面體結(jié)構(gòu)單元，隨核化時間延長及晶化溫度提高， 紅外最強吸收帶朝低波數(shù)方向移動， 吸收帶強度隨晶化溫度的提高而增大。
關(guān)鍵字: SiO2Al2O3CaOFe2O3系； 微晶玻璃； 晶化
（1. College of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, P.R.China;
2. College of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, P.R.China）
Abstract:The crystallization process and kinetics of SiO2Al2O3CaOFe2O3 glassceramic were investigated by using IR, DTA, XRD and SEM. The results show that the initial and final crystalline phase of the glassceramics is Ca(Fe, Mg)Si2O6and Ca2Al2SiO7 is the transition crystalline phase. With increasing of crystallization temperature, Ca2Al2SiO7 disappeared. The index of crystal growth is2.9 and it implies that Ca(Fe, Mg)Si2O6 crystals grow along three dimensional space. Glasses have interlinked SiO4, AlO4 and Fe3+O4 tetrahedra as theirmost fundamental units. With prolonging nucleation time and increasing crystallization temperature , the strongest IR absorption bands shift from the high frequency region to lower frequencies region.
Key words: SiO2Al2O3CaOFe2O3 system； glassceramic; crystallization
