Network structure evolution and properties of CaO–MgO–Al2O3–SiO2 glass-ceramics from BaO-bearing blast furnace slag. Issue 10 (15th May 2023)

• Record Type: Journal Article
• Authors: Liu, Wenguo; Zuo, Haibin; Xing, Xiangdong; Xu, Yijun; Ding, Wang; Wang, Jingsong; Xue, Qingguo
• Is Part Of: Ceramics international. Volume 49:Issue 10(2023)
• Page Start: 16323
• Page End: 16331
• Publication Date: 2023-05-15
• Subjects: Glass-ceramics -- Blast furnace slag -- BaO -- Crystals -- Structure; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2023.01.233
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this study, the influence of BaO content on the network structure evolution and properties of glass-ceramics prepared from blast furnace (BF) slag was investigated based on Raman and 27 Al magic angles spinning nuclear magnetic resonance ( 27 Al MAS NMR) spectra. The crystalline phases and microstructure changes were identified through X-ray diffraction (XRD) and field emission scanning electron microscope (FESEM). The results showed that a moderate addition of BaO enhanced the relative concentrations of Q 0 and Q 1 in Si-based structure, with a descent in [AlO4 ] unit in Al-based structure, decreasing the viscosity and the migration resistance of ions. The diopside and augite were generated and the related peak intensity was greater when BaO concentration was about 3 wt %. The tiny crystal number increased and grain size reduced significantly as BaO content raised to 3 wt %, generating the densified structure with uniform distribution of crystals. However, an excessive BaO content presented the negative effects on the structure densification. When BaO content was about 3 wt %, the glass-ceramics presented the better comprehensive performances with the density of 3.115 g/cm 3, flexural strength of 153.56 MPa, Vickers hardness of 7.69 GPa, and the corrosion resistance more than 96%.