利用高铝粉煤灰制备堇青石微晶玻璃的实验研究

The preparation of cordierite glass-ceramics from high alumina fly ash

以高铝粉煤灰为主要原料，制备了堇青石微晶玻璃。通过差热分析（DTA）和X射线粉末衍射分析（XRD）确定了合适的热处理条件：核化温度807℃，核化时间2h，晶化温度960℃，晶化时间3h。XRD分析显示，制得微晶玻璃的主晶相为堇青石。SEM分析表明，基础玻璃晶化完全，微晶玻璃中微晶体呈不规则柱状、棒状，微晶体长度为5～15μm，长径比为5～10。

The cordierite glass-ceramics were prepared using high alumina fly ash as the main raw material. On the basis of DTA and XRD analysis, nucleation experiments were carried out at 807℃ for 2h and crystallization experiments were performed at 960℃ for 3h. X-ray diffraction analysis reveals that the main crystalline phase of the synthesized glass-ceramics is cordierite. SEM observations indicate that the based glass is crystallized completely and the microcrystals in the prepared glass-ceramics are of the anomalous rod-like shape, with the length of 5-15 μm and the aspect ratio ranging from 5 to 10.