Effects of alkali oxides and ion-exchange on the structure of zinc-alumino-silicate glasses and glass-ceramics. Issue 2 (February 2022)

• Record Type: Journal Article
• Authors: Guo, Yunlan; Liu, Chao; Wang, Jing; Ruan, Jian; Xie, Jun; Han, Jianjun; Deng, Zhao; Zhao, Xiujian
• Is Part Of: Journal of the European Ceramic Society. Volume 42:Issue 2(2022)
• Page Start: 576
• Page End: 588
• Publication Date: 2022-02
• Subjects: Glass-ceramic -- ZnO -- β-Zn2SiO4 -- Glass structure -- Ion-exchange; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2021.10.016
• Languages: English
• ISSNs: 0955-2219

Abstract

Highlights: Effects of Na2 O/K2 O ratio on crystallization properties of ZnO and β-Zn2 SiO4 nanocrystals were investigated. Crystallization of ZnO and β-Zn2 SiO4 nanocrystals can improve ion-exchange properties. Na + and K + ions doped into ZnO and β-Zn2 SiO4 crystalline phases. Ion-exchange further promotes the incorporation of Na + and K + ions into ZnO and β-Zn2 SiO4 crystalline phases. Abstract: Types and contents of alkali metal ions play important role on crystallization and ion-exchange properties in glasses. In this work, effects of Na2 O/K2 O ratio on crystallization and ion-exchange properties of zinc-alumino-silicate glasses were investigated. The crystalline phases precipitated in glasses changes from ZnO to β-Zn2 SiO4 with the progressive replacement of K2 O by Na2 O in parent glasses. Ion-exchange depth of layer (DOL) decreases gradually with the increase in Na2 O content in parent glasses. Precipitation of ZnO and β-Zn2 SiO4 nanocrystals facilitated the ion-exchange and enlarged the DOL. Na + and K + ions were doped into ZnO and β-Zn2 SiO4 nanocrystals during heat-treatment, and the extent of doping was facilitated by ion-exchange. Vickers hardness were improved significantly with the crystallization and ion-exchange. Results reported here are valuable for the controlled preparation and chemical strengthening of ZnO and β-Zn2 SiO4 glass-ceramics.