Pressure-induced changes in interdiffusivity and compressive stress in chemically strengthened glass

Mouritz N. Svenson, Lynn M. Thirion, Randall E. Youngman, John C. Mauro, Sylwester J. Rzoska, Michal Bockowski, Morten M. Smedskjaer

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Abstract

Glass exhibits a significant change in properties when subjected to high pressure because the short-And intermediate-range atomic structures of glass are tunable through compression. Understanding the link between the atomic structure and macroscopic properties of glass under high pressure is an important scientific problem because the glass structures obtained via quenching from elevated pressure may give rise to properties unattainable under standard ambient pressure conditions. In particular, the chemical strengthening of glass through K+-for-Na+ ion exchange is currently receiving significant interest due to the increasing demand for stronger and more damage-resistant glass. However, the interplay among isostatic compression, pressure-induced changes in alkali diffusivity, compressive stress generated through ion exchange, and the resulting mechanical properties are poorly understood. In this work, we employ a specially designed gas pressure chamber to compress bulk glass samples isostatically up to 1 GPa at elevated temperature before or after the ion exchange treatment of a commercial sodium-magnesium aluminosilicate glass. Compression of the samples prior to ion exchange leads to a decreased Na+-K+ interdiffusivity, increased compressive stress, and slightly increased hardness. Compression after the ion exchange treatment changes the shape of the potassium-sodium diffusion profiles and significantly increases glass hardness. We discuss these results in terms of the underlying structural changes in network-modifier environments and overall network densification.

Original languageEnglish (US)
Pages (from-to)10436-10444
Number of pages9
JournalACS Applied Materials and Interfaces
Volume6
Issue number13
DOIs
Publication statusPublished - Jul 9 2014

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Svenson, M. N., Thirion, L. M., Youngman, R. E., Mauro, J. C., Rzoska, S. J., Bockowski, M., & Smedskjaer, M. M. (2014). Pressure-induced changes in interdiffusivity and compressive stress in chemically strengthened glass. ACS Applied Materials and Interfaces, 6(13), 10436-10444. https://doi.org/10.1021/am5019868