Fusion-formable glass-based articles including a metal oxide concentration gradient
An oxide, glass technology, applied in the field of fused formable glass-based articles containing a concentration gradient of metal oxides, capable of solving problems such as failure to exhibit stress distribution
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Embodiment 1
[0258] Examples 1A-1G include a glass substrate having a nominal composition of about 63.46 mole % SiO 2 , 15.71 mol% Al 2 o 3 , 6.37 mol% Li 2 O, 10.69 mol% Na 2 O, 0.06 mol% MgO, 1.15 mol% ZnO, 2.45 mol% P 2 o 5 and 0.04 mol% SnO 2 . The thickness of the glass substrate was 0.8 mm. The glass substrates of Examples 1A-1G contained 100% NaNO 3 And the ion exchange is carried out in a molten salt bath with a temperature of about 390°C, according to the conditions shown in Table 2. The resulting glass-based articles exhibited maximum CT values at Figure 10 plotted as a function of ion exchange time in .
[0259] Table 2: Ion exchange conditions for Examples 1A-1G
[0260]
[0261] The stress distribution of Example IE was measured using the RNF method as described herein. Figure 11 The measured stress is shown as a function of depth extending into the glass-based article from the surface of the glass-based article of Example IE. Shown in Table 3 are the stres...
Embodiment 2
[0265] Example 2A included a glass substrate having the same composition as Example 1, and had a thickness of 0.8 mm. The glass substrate contains 51% KNO in 3 and 49% NaNO 3 And ion exchange in a single molten salt bath with a temperature of about 380°C for 3.75 hours. The resulting glass-based articles exhibited the stress distribution shown in Table 4.
[0266] Table 4: Stress distribution of Example 2A
[0267]
[0268] The glass-based article according to Example 2A was subjected to the AROR test as described herein. One set of glass-based articles was abraded with a pressure or load of 5 psi, a second set of glass-based articles was abraded with a pressure or load of 25 psi, and a third set of glass-based articles was abraded with a pressure or load of 45 psi. AROR data such as Figure 12 shown. like Figure 12 As shown, all glass-based articles according to Example 2A exhibited an average load to failure of greater than about 20 kgf.
[0269] A glass-based ar...
Embodiment 3
[0276] Example 3A included a glass substrate having the same composition as Example 1, and had a thickness of 0.8 mm. Comparative Example 3B included a glass substrate having the same composition as Comparative Example 2D, and had a thickness of 0.8 mm. The glass substrate of Example 3A was chemically strengthened in a single step using a single bath, as described in Table 6. The glass substrate of Comparative Example 3B was ion-exchanged in a two-step process, as described in Table 6.
[0277] Table 6: Ion exchange conditions of Example 3A and Comparative Example 3B
[0278]
[0279] Glass-based articles according to Example 3A and Comparative Example 3B were retrofitted on the same mobile phone device. The telephone unit was dropped onto 30 grit sandpaper from height increments starting at 20 cm. The height at which the glass-based article fails the test on 30 grit sandpaper is plotted on Figure 14 middle. like Figure 14 As shown, the glass-based article of Exampl...
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