硅酸盐学报2013，Vol.41Issue(1)：122-128,7.DOI:10.7521/j.issn.0454-5648.2013.01.23
晶化温度对CaO-Al2O3-SiO2-Fe2O3系粉煤灰微晶玻璃析晶及性能的影响
Effect of Crystallization Temperature on Crystallization and Properties of CaO-Al2O3-SiO2-Fe2O3 Glass Ceramics from Coal Fly Ash
曹超 1彭同江 1丁文金2
作者信息
- 1. 西南科技大学,固体废物处理与资源化省部共建教育部重点实验室,四川绵阳621010
- 2. 西南科技大学矿物材料及应用研究所,四川绵阳621010
- 折叠
摘要
Abstract
The glass-ceramics with the anorthite, augite and nepheline as the crystalline phases were prepared with coal fly ash, limestone and sodium carbonate by a two-step sintering process. Effect of crystallization temperature (850-1 100 ℃) on the crystallization behavior, microstructure and properties of glass-ceramics samples were analyzed by means of differential thermal analysis, X-ray diffraction, scanning electron microscopy and other methods as well. The results show that the contents of anorthite and nepheline firstly increase and then decrease with the increase of the crystallization temperature, while, the augite content increases invariably. Also, the crystal grew up gradually, and its morphology changed from spherical grains to prismatic crystals and finally grew to a mature flake microcrystalline with increasing the crystallization temperature. The increase of crystallization temperature can improve the sintering densification of the coal fly ash glass-ceramics in a certain range. The glass-ceramics samples with the highest linear shrinkage rate (17.04%), highest bulk density (2.76 g/cm3) and the minimum water absorption (0.01%) were obtained by crystallizing at 950 ℃. However, the extortionate crystallization temperature (> 1 100 ℃) could prevent the sintering densification.关键词
粉煤灰/微晶玻璃/晶化温度/性能Key words
coal fly ash/ glass-ceramics/ crystallization temperature/ properties分类
化学化工引用本文复制引用
曹超,彭同江,丁文金..晶化温度对CaO-Al2O3-SiO2-Fe2O3系粉煤灰微晶玻璃析晶及性能的影响[J].硅酸盐学报,2013,41(1):122-128,7.
