| Influence of Ferrum on Crystallization and Microstructure
of Steel Slag Based Glass-Ceramics |
Zhaobo Liu, Yanbing Zong*, Huan Feng1 and Daqiang Cang
Pages : 29-34
DOI : 10.1080/0371750X.2014.988831 |
| Abstract |
| The influence of iron content and oxidation state on the crystallization and microstructure of steel slag based
glass-ceramics was investigated in the CaO-Al2O3-SiO2-MgO-FeOx system. The crystallization mechanism of parent
glass and microstructure of final products were studied by thermogravimetry and differential thermal analysis
(TG-DTA), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and field emission scanning
electron microscopy (FESEM). The results indicate that part of Fe3+ appeared as six-coordinated [FeO6] octahedron
and acted as network modifier with more ferrous or metallic irons being further oxidized to ferric irons. The crystalline
temperatures of glass samples shifted to higher values as the iron content became lower supported by the result
of crystallization activation energy. The crystal morphology of low iron content samples appeared mainly in the
form of cluster or column and limited amount of granule, while sample with high iron content was principally
composed of granular crystals.
[Keywords: Glass-ceramics, Steel slag, Ferrum, Crystallization, Microstructure] |
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