【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 Al2 O3 CaO Fe2 O3系微晶玻璃晶化过程及其结晶动力学。结果表明 :SiO2 Al2 O3 CaO Fe2 O3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。更多还原

【Abstract】 The crystallization process and kinetics of SiO 2 Al 2O 3 CaO Fe 2O 3 glass ceramic were investigated by using IR, DTA, XRD and SEM. The results show that the initial and final crystalline phase of the glass ceramics is Ca(Fe, Mg)Si 2O 6 and Ca 2Al 2SiO 7 is the transition crystalline phase. With increasing of crystallization temperature, Ca 2Al 2SiO 7 disappeared. The index of crystal growth is 2.9 and it implies that Ca(Fe, Mg)Si 2O 6 crystals grow along three dimensional space. Glasses have interlinked SiO 4, AlO 4 and Fe 3+O 4 tetrahedra as their most 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. [更多还原