Nano-crystal glass-ceramics obtained by crystallization of vitrified coal fly ash
Nano-crystal glass-ceramics obtained by crystallization of vitrified coal fly ash
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DOI：
10.1016/j.fuel.2004.04.008
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发表时间：
2004-10
期刊：
影响因子：
7.4
通讯作者：
F. Peng;K. Liang;A. Hu;Hua Shao
中科院分区：
文献类型：
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作者：
F. Peng;K. Liang;A. Hu;Hua Shao
用Na2O+CaO和BaO+CaO作为助熔剂，熔融中国北部某电厂的飞灰，制得玻璃。通过热处理将得到的玻璃转变为纳米微晶玻璃。X射线衍射图表明，两种微晶玻璃的主晶相均为硅灰石(CaSiO_3)。晶体均匀地分散在母玻璃中。平均晶体尺寸小于300 nm，并随热处理工艺的不同而不同。测试了两种玻璃的密度、热膨胀系数、硬度和抗弯强度等物理机械性能，并讨论了相应的微观结构。结果表明，这两种微晶玻璃都具有广泛的建筑应用潜力。
Glass has been obtained by melting coal fly ash from a power plant in North China with Na2O+CaO and BaO+CaO as fluxing additives. A thermal treatment was employed to convert the obtained glass to nano-crystal glass-ceramics. X-ray diffraction patterns show that the main crystalline phase in both the glass-ceramics is wollastonite (CaSiO3). The crystals are homogeneously dispersed within the parent glass. The average crystal size is below 300 nm, and varies according to heat treatment process used. Physical and mechanical properties, such as density, thermal expansion coefficient, hardness, and bending strength, of the two glasses have been examined and the corresponding microstructures are discussed. The results demonstrate that both glass-ceramics have potential for a wide range of construction application.