(1. 广西大学 化学化工学院, 南宁 530004;
2. 武汉工业大学 材料科学与工程学院, 武汉 430070)
摘 要: 利用差热分析(DTA)、 红外吸收光谱(IR)、X射线衍射(XRD)和扫描电镜(SEM)等手段研究了SiO2-Al2O3-CaO-Fe2O3系微晶玻璃晶化过程及其结晶动力学。结果表明: SiO2-Al2O3-CaO-Fe2O3系微晶玻璃晶化过程中,初晶相是钙铁透辉石, 钙铝黄长石是中间过渡相且随晶化温度的提高而消失, 最终晶相只有钙铁透辉石;晶体生长指数为2.9, 属三维生长。 玻璃网络中主要有SiO4, AlO4及Fe3+O4四面体结构单元,随核化时间延长及晶化温度提高, 红外最强吸收带朝低波数方向移动, 吸收带强度随晶化温度的提高而增大。
关键字: 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