| Effects of Iron Oxide on the Crystallization Kinetics
of Baiyunebo Tailing Glass-Ceramics |
Li Baowei, Du Yongsheng*, Zhang Xuefeng, Jia Xiaolin1, Zhao Ming and Chen Hua
pages : 119-123
DOI : 10.1080/0371750X.2013.795718 |
| Abstract |
| Glass-ceramics in the CaO-MgO-Al2O3-SiO2 system were prepared using Baiyunebo tailing and fly ash as the main
raw materials. The effects of iron oxide (Fe2O3) on the crystallization kinetics of augite-based glass-ceramics were
studied by using differential thermal analysis (DTA), X-ray powder diffraction (XRD), electron backscatter diffraction
(EBSD), energy dispersive spectrometer (EDS) and Raman microscopy. The results of Raman and EBSD examinations
confirmed the presence of magnetite phase within the glass after nucleation treatment. Augite was the main crystal
phase of the studied glass-ceramics. Our result suggested magnetite nuclei to be the starting points of augite
crystallization. In addition, the activation energy of crystallization (Ec) for augite crystal growth, obtained from
Kissinger equation, first increased up to a maximum, then decreased with the increase of additional iron oxide,
varying between 331 and 426 kJ.mol–1. The variation of activation energy might be related to the viscosity of glass,
which was influenced by the iron oxide content in the glass-ceramics. |
| Full text : Subscribe to Download Full Text |
| [Go Back] |
|
