Method for strengthening flat glass plate for display
A glass plate and plane technology, applied in the manufacture of instruments, ships or lead-in wires, optics, etc., can solve problems such as inhomogeneity and ion exchange instability
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example 1
[0023] Potassium nitrate (KNO3) and alumina (Al 2 o 3 ) powder mixture is placed on the surface of a silicate glass plate containing 4.8w / w% Na 2 O, 6.2w / w%K 2 O, 1.66w / w% MgO, 5.25w / w% CaO, 7.2w / w% SrO, 8w / w% BaO, 2.7w / w% ZrO 2 , 6.7w / w% Al 2 o 3 and 57.3w / w% SiO as the main component 2 .
[0024] The glass plate with the solid layer was placed in a furnace, heated to 480° C. over 1 hour, and held at this temperature for 1 hour. The heat-treated glass plate was allowed to cool to 20° C. over 2 hours and then washed with distilled water to remove the residual powder layer.
[0025] A 100 g load was applied at 5 points with a Vickers hardness tester to determine the average microhardness (MPa) of each glass plate ((1-1) to (1-6)) obtained above, and these average microhardness The microhardness was compared to the hardness of the original untreated glass plate (control). The results are shown in Table 1. The change in the microhardness of the glass plate as a function...
example 2
[0029] Potassium nitrate (KNO 3 ), alumina (Al 2 o 3 ) and aluminum trichloride (AlCl 3 ) mixture was placed on the surface of the same glass plate as in Example 1 to form a solid layer 1 mm to 2 mm thick thereon.
[0030] The glass plate with the solid layer was placed in a furnace, heated to 460° C. over 1 hour, and then held at this temperature for 1 hour. The heat-treated glass plate was allowed to cool to 20° C. over 2 hours and then washed with distilled water to remove the residual powder layer.
[0031] A load of 100 g was applied at 5 points using a Vickers hardness tester to determine the average microhardness (MPa) of each of the glass plates ((2-1) to (2-4)) obtained above was determined. The results are shown in Table 2. exist figure 2 Shown in is the SEM photograph of the surface of a glass plate treated with a mixture of 50 mol% potassium nitrate, 40 mol% alumina and 10 mol% aluminum trichloride.
[0032] sample
[0033] As shown in table 2, ac...
example 3
[0035] Except using a mixture of 35 mol% potassium nitrate and 65 mol% alumina, the heat treatment (ion exchange) temperature was changed as shown in Table 3, and the procedure of Example 1 was repeated to prepare various glass plates.
[0036] A load of 100 g was applied at 5 points with a Vickers hardness tester to determine the average microhardness (MPa) of each of the glass plates ((3-1) to (3-5)) obtained above. The results are shown in Table 3.
[0037] sample
ion exchange temperature
(℃)
Average Microhardness
(MPa)
standard deviation
control
-
583.5
13.8
(3-1)
360
595.1
10.6
(3-2)
380
599.4
8.7
(3-3)
400
610.2
6.6
(3-4)
450
618.4
5.3
(3-5)
500
620.6
6.2
[0038] As shown in Table 3, glass sheets heat-treated at temperatures below 400°C showed unsatisfactory strength, w...
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