TiO2加入量对高炉渣微晶玻璃析晶的影响

以高炉渣微晶玻璃为研究对象，改变配料中晶核剂TiO2的含量，制得微晶玻璃样品. 以不同的升温速率对样品进行差热分析，根据升温速率和差热分析曲线上的晶化峰温度，采用3种不同的方法计算微晶玻璃样品的析晶活化能. 结果表明，随着TiO2含量的增加，析晶活化能呈现出先减小后增大的趋势，在TiO2的加入量为3.1%时，微晶玻璃的析晶活化能最低，此时拟合出的3种析晶活化能最小值分别为135.7, 143.9, 151.7 kJ/mol. 样品的红外谱图表明，TiO2的含量为3%~4%时析出晶体较多. TiO2含量为3%和4%的样品的X射线衍射图谱表明，样品中析出了以透辉石为主晶相、金红石为次晶相的晶体.

Effect of TiO2 Addition on Crystallization of Glass-ceramic Made from Blast Furnace Slag

Glass-ceramic made from blast furnace slag was studied.Glass-ceramic samples were produced by changing the content of TiO_2 as nucleation-agent in the parent glass,and the samples were analyzed by a differential thermal analyzer(DTA)at different heating rates.Based on heating rate and the peak crystallization temperatures from the DTA curves,three different methods were used to calculate crystallization activation energy of glass-ceramic samples.The results showed that as TiO_2 content increased,the values of activation energy first decreased,then increased.When the content of TiO_2 was 3.1%,the activation energy was the lowest,135.7,143.9, or 151.7 kJ/mol,as calculated by the three different methods.Infrared spectra showed that the crystallization was the easiest when the content of TiO_2 was between 3% and 4%.X-ray diffraction analysis showed that when the content of TiO_2 was between 3% and 4%,the formed glass-ceramic had the crystal phases of diopside as main phase and rutile as subordinate crystal phase.