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Preparation and properties of diopside-based CaO-MgO-Al2O3-SiO2 glass-ceramic using biomass fly ash

•Glass-ceramic was prepared from biomass fly ash by using a powder sintering method.•The crystallization behavior was dominated by surface crystallization.•Fine diopside grains (0.2–1 μm) were observed in the glass-ceramic.•The highest bending strength of glass-ceramic reached 212 MPa when sintered...

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Published in:Journal of non-crystalline solids 2023-01, Vol.600, p.122015, Article 122015
Main Authors: Wang, Hong-Yang, Li, Yu, Jiao, Shu-Qiang, Chou, Kuo-Chih, Zhang, Guo-Hua
Format: Article
Language:English
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Summary:•Glass-ceramic was prepared from biomass fly ash by using a powder sintering method.•The crystallization behavior was dominated by surface crystallization.•Fine diopside grains (0.2–1 μm) were observed in the glass-ceramic.•The highest bending strength of glass-ceramic reached 212 MPa when sintered at 920 ℃ for 1 h. In this work, diopside-based CaO-MgO-Al2O3-SiO2 glass-ceramic was prepared from biomass fly ash (BFA) by powder sintering method. The parent glass powder was prepared by melting 76%BFA-9%CaO-6%Al2O3–9%MgO (in mass) at 1450 ℃ followed by water quenching and ball milling. The glass powder was sintered at 830, 850 and 920 ℃ for 1–16 h to obtain the glass-ceramic. It was found that the crystallization behavior was controlled by surface crystallization, and diopside was the major crystalline phase. The mechanical properties of glass-ceramic were improved by prolonging the sintering time from 4 to 16 h at 830 ℃. However, the sizes of pores in glass-ceramic increased as increasing the sintering time at 850 ℃, which deteriorated the properties of the glass-ceramic. The glass-ceramic sintered at 920 ℃ for 1 h has a high crystallinity and fine grains, and showed the highest bending strength of 212 MPa.
ISSN:0022-3093
1873-4812
DOI:10.1016/j.jnoncrysol.2022.122015