Chemical durability and weathering resistance of canasite based glass and glass-ceramics

DENG, Wei, CHENG, Jin-shu, TIAN, Pei-jing and WANG, Mi-tang (2012). Chemical durability and weathering resistance of canasite based glass and glass-ceramics. Journal of Non-Crystalline Solids, 358 (21), 2847-2854.

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Classic composition 8.4Na2O·5K2O·10.8CaO·64SiO2·10.5CaF2·1.3Al2O3 (G1/GC1) and high silicon composition 7.6Na2O·4K2O·8.4CaO·71SiO2·8CaF2·1.0Al2O3 (G2/GC2) canasite-based glass and glass-ceramics were prepared, and the chemical durability and weathering of samples were studied with XRD, ICP-AES, SEMand optical microscopy. Interestingly, a kind of color fringe pattern caused by the acid leachingwas directly observed on the glass ceramic surface under opticalmicroscopy. The 20 day weight losses of glass and glass ceramic in acid (1 M HCl) and alkali (1 M NaOH/1 M Na2CO3) solution weremeasured. Accelerated weathering was used to demonstrate that increasing silicon content contributes to the weathering performance of glass and glass-ceramics. For differentmicro-structures and compositions, the weight loss of each glass and glass-ceramic is quite different. In general, through increasing the network interconnectivity of residual glass network and suppressing the crystallization of the less durable canasite phase, the addition of SiO2 (from 60 mol% to 71 mol%) enhanced the chemical durability of canasite-based glass and glass ceramic relatively under acid, alkali and weathering conditions.

Item Type: Article
Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute
Identification Number:
Page Range: 2847-2854
Depositing User: Carmel House
Date Deposited: 06 Jan 2017 12:47
Last Modified: 18 Mar 2021 22:15

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