ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty


STRUCTURE AND PROPERTIES OF GLASS-CERAMICS FROM BLAST FURNACE SLAG WITH DIFFERENT A l₂O₃/S iO₂ RATIO
 
Li Zuhao 1, He Feng 1,2, Zhang Wentao 1, Xie Junlin 2 , 1
 
1 State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China
2 School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China

Keywords: Glass-ceramics, Blast furnace slag, Al₂O₃/SiO₂, Structure, Sintering
 

Different Al₂O₃/SiO₂ glass-ceramics were prepared from blast furnace slag by sintering method. The structure and properties of glasses or glass-ceramics were investigated by DSC, XRD, SEM, FTIR, 27Al MAS NMR. The DSC results showed that with the increase of Al₂O₃/SiO₂, the glass transition temperature (Tg) first decreased and then increased, reached the minimum when Al₂O₃/SiO₂ was 0.34. The volume density, bending strength and microhardness of glass-ceramics also showed the same variation rule. Structural analysis showed that when the Al₂O₃/SiO₂ increased from 0.19 to 0.34, Q₂ gradually transformed into Q₁ and Q₃; when the Al₂O₃/SiO₂ continued to increase from 0.34 to 0.39, Q₁ and Q₃ decreased while Q₂ increased. The variation of [AlO4] and [AlO6] made the glass network structure the loosest when Al₂O₃/SiO₂ was 0.34. Gehlenite was the main crystalline phase in glass-ceramics, and with the increase of Al₂O₃/SiO₂, the precipitation of gehlenite increased, while the precipitation of diopside and hyalophane decreased.


doi: 10.13168/cs.2021.0018
 
 
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