硅酸盐学报

CaO–Al₂O₃–SiO₂系粉煤灰微晶玻璃的析晶动力学及电子探针分析

作者：姚树玉姚玉随韩野张伟伟

关键词：粉煤灰微晶玻璃析晶动力学硅灰石

分类号：TQ171.733

出版年,卷(期):页码：2012,40(1):170-170

DOI：

摘要：

摘要：利用烧结法制备了CaO–Al₂O₃–SiO₂系粉煤灰微晶玻璃。采用差热分析方法确定了析晶峰温度T_p，研究了其晶析动力学，并利用JMA方程获得的析晶动力学参数k(T_p)制备玻璃热稳定性。采用X射线衍射、电子探针–能谱分析方法研究了微晶玻璃中玻璃基体、晶相的组成。研究结果表明：析晶活化能E_a为591.5kJ/mol，指前因子A为1.87×10¹³min^–¹，k(T_p)判据表明玻璃的稳定性随升温速率的增加而降低；升温速率对主晶相的种类没有影响，即均为单一的β-硅灰石，其尺寸大小约为2～20μm；基体玻璃中原子种类十分复杂，既有网络形成体，又有网络修饰体和网络中间体，其性质与Na₂O?SiO₂玻璃相近。

Abstract: A glass-ceramic of CaO–Al₂O₃–SiO₂ was prepared from coal fly-ash by a sintering method. The crystallization peak temperature T_p was calculated by differential thermal analysis, the crystallization kinetic was investigated, and the thermal stability of glass was estimated by the crystallization kinetic. The crystalline phase and matrix of the glass-ceramic were characterized by X-ray diffraction and electron probe microanalysis–energy spectrum analysis, respectively. The results show that the activation energy E_a is 591.5kJ/mol, and the index A is 1.87×10¹³min^–1. According to the k(T_p), the stability of the glass decreased with increasing the heating rate, and the heating rate had little effect on the major crystalline phases. The β-wollastonite was the single crystalline phase with the grain sizes of 2–20μm. The atoms in the glass matrix, which involved the network former, the modified cation and the intermediate former as well, were rather complicated. The property of the matrix was similar to that of the glass of Na₂O?SiO₂.

基金项目：

高技术研究发展计划(2006AA06Z381)；山东省优秀中青年科学家奖励基金计划(BS2009CL027/BS2010CL037)；青岛市科技计划(11-2-4-4(7)-jch)资助项目。

作者简介：

姚树玉(1971—)，男，博士，副教授。

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