Effect of TiO2 on crystallization of the glass ceramics prepared from granite tailings

Abstract

The effect of TiO 2 on the crystallization behaviors of the glass ceramics prepared from granite tailings was investigated by differential scanning calorimetry (DSC), X-ray diffraction (XRD), and fi eld emission scanning electron microscopy (FESEM). The results showed that the crystallization peak temperature decreased fi rstly, and then increased with the increase of TiO 2 content. The optimum addition amount of TiO 2 was 8 wt%. With a single-step heat treatment at 924 ℃ for 1 h, augite precipitated as the only crystalline phase both on the surface and in the interior. The avrami parameter of the sample was 3.25, suggesting a twodimensional crystallization mechanism. The activation energies for phase separation and crystallization of augite were 321.75 and 698.83 kJ/mol, respectively.

Exploration of Basalt Glasses as High-Temperature Sensible Heat Storage Materials

“…Compared with ordinary glasses and ores, basalts contain more iron oxide (4−7 mol %), which will have a great impact on the thermophysical properties such as crystallization temperature and viscosity. 24,25 Among the studied samples, the content of alumina in the network intermediate showed a weak variation. Alumina can combine with the free oxygen in the glass to participate in the network formation with the four-coordinate [AlO 4 ], which plays the role of network compensation.…”