Microstructure and ion-exchange properties of glass-ceramics containing ZnAl2O4 and β-quartz solid solution nanocrystals. Issue 10 (August 2021)

• Record Type: Journal Article
• Authors: Guo, Yunlan; Wang, Jing; Ruan, Jian; Han, Jianjun; Xie, Jun; Liu, Chao
• Is Part Of: Journal of the European Ceramic Society. Volume 41:Issue 10(2021)
• Page Start: 5331
• Page End: 5340
• Publication Date: 2021-08
• Subjects: Glass-ceramic -- ZnAl2O4 -- β-Quartz solid solution -- 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.2021.04.015
• Languages: English
• ISSNs: 0955-2219

Abstract

Highlights: Glass-ceramics containing ZnAl2 O4 and β-quartz solid solution nanocrystals were prepared. Compared with the specimen with simultaneous precipitation of ZnAl2 O4 and β-quartz solid solution nanocrystals, glass-ceramics with sequential crystallization of ZnAl2 O4 and β-quartz solid solution nanocrystals show smaller grain size and more uniform structure and higher transparency. Ion-exchange depth of layer increased significantly with the crystallization, which was related to the reduction in content of zinc and five coordinated aluminum in the residual glass matrix. It was found that ionexchange process took place at the boundaries between nanocrystals and glass matrix, which was also considered to be responsible for the enhanced depth of layer. Abstract: Crystallization of glass has significant effects on glass structure and the resultant ion-exchange behaviors. In this work, transparent glass-ceramics (GCs) with sequential crystallization of ZnAl2 O4 and β-quartz solid solution nanocrystals (NCs) were prepared, and effects of the crystallization on microstructure and ion-exchange properties were investigated. Compared with the specimen with simultaneous precipitation of ZnAl2 O4 and β-quartz solid solution NCs, GCs with sequential crystallization of ZnAl2 O4 and β-quartz solid solution NCs show smaller grain size and more uniform structure and higher transparency. Ion-exchange depth of layer (DOL) increases significantly with the crystallization of the specimens due to the reduction in content of zinc and five coordinated aluminum in the residual glass matrix. High residual compressive stress and Vickers hardness can be obtained after ion-exchange in KNO3 molten salt.