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GLASS COMPOSITIONS THAT RETAIN HIGH COMPRESSIVE STRESS AFTER POST-ION EXCHANGE HEAT TREATMENT
GLASS COMPOSITIONS THAT RETAIN HIGH COMPRESSIVE STRESS AFTER POST-ION EXCHANGE HEAT TREATMENT
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机译:离子交换后热处理后仍保持高压缩应力的玻璃成分
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摘要
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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