关键词: 微晶玻璃, 晶核剂, 析晶活化能, 差热分析, 红外分析, X射线衍射分析

Abstract: Glass-ceramic made from blast furnace slag was studied. Glass-ceramic samples were produced by changing the content of TiO2 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 TiO2 content increased, the values of activation energy first decreased, then increased. When the content of TiO2 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 TiO2 was between 3% and 4%. X-ray diffraction analysis showed that when the content of TiO2 was between 3% and 4%, the formed glass-ceramic had the crystal phases of diopside as main phase and rutile as subordinate crystal phase.

Key words: glass-ceramic, nucleation-agent, nucleation-agent, crystallization activation energy, differential thermal analyzer, IR, XRD