Chemical Strengthening of Alkali-Free Glass via Pressure Vessel Ion Exchange

John C. Mauro, Carlton M. Truesdale, Kaveh Adib, Alana M. Whittier, Arthur W. Martin

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Ion exchange is a popular technique for chemically strengthening alkali-containing glass articles, such as Corning® Gorilla® Glass. The ion exchange process is based on a replacement of small alkali ions in the glass with larger alkali ions from a molten salt bath through inter-diffusion. As the larger alkali ions from the salt bath supplant the smaller alkali ions in the glass, a compressive stress profile is generated near the surface of the glass, which increases its strength and damage resistance. However, certain applications of high-tech glasses require alkali-free environments, such as glasses used as substrates for flat panel display applications. In this paper, we report the first successful chemical strengthening of an alkali-free glass. This is achieved via an aqueous ion exchange of barium salts under high pressure and temperature. X-ray photoelectron spectroscopy reveals that Ba2+ replaces both Ca2+ and B3+ in the glass, producing surface compressive stress values near 200 MPa. This technology may enable chemical strengthening for a wide range of applications, including flat panel display substrates.

Original languageEnglish (US)
Pages (from-to)446-451
Number of pages6
JournalInternational Journal of Applied Glass Science
Volume7
Issue number4
DOIs
StatePublished - Dec 1 2016

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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