GLASS COMPOSITIONS THAT RETAIN HIGH COMPRESSIVE STRESS AFTER POST-ION EXCHANGE HEAT TREATMENT
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United States of America Patent
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Issued Date -
Nov 9, 2017
app pub date -
Apr 28, 2017
filing date -
May 6, 2016
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Abstract
Ion exchangeable glasses containing SiO2, Na2O, MgO, and, optionally, at least one of Li2O and ZrO2. These glasses are also free of at least one of B2O3, K2O, CaO, and P2O5. These glasses may be ion-exchanged to achieve a depth of compressive layer of at least about 40 μm or up to about 50 μm and a maximum surface compressive stress of at least about 950 MPa, in some embodiments, at least 1000 MPa and, in other embodiments, at least about 1100 MPa. The ion-exchanged glasses, when subsequently heat-treated, have a retained compressive stress of at least about 600 MPa at the surface of the glass and, in some embodiments, at least about 750 MPa. The glasses also exhibit high levels of durability when exposed to strong acid.
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