Reinforcement method of aluminosilicate glass

A technology of aluminosilicate glass and strengthening treatment, which is applied in glass tempering, glass manufacturing equipment, manufacturing tools, etc. It can solve the problems that the exchange layer cannot reach the bending strength, thin glass is deformed, and the glass surface is easily damaged.

Active Publication Date: 2015-04-29
CSG HOLDING
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Problems solved by technology

[0012] However, the current high-temperature ion exchange method is rarely used. The high-temperature ion exchange method has the problem that the glass surface is easily damaged by molten salt corrosion during strengthening treatment, and it is difficult to obtain a glass substrate suitable for use as a cover glass for portable equipment. Deform the thin glass, the deformation rate exceeds 20%, and the exchange layer is too deep to reach the designed bending strength

Method used

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  • Reinforcement method of aluminosilicate glass
  • Reinforcement method of aluminosilicate glass
  • Reinforcement method of aluminosilicate glass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～42

[0093] The composition of the aluminosilicate glass in Examples 1-42 is shown in Table 1. The numerical value corresponding to each raw material in Table 1 is the molar percentage of the raw material.

[0094] Table 1

[0095]

[0096] When preparing the aluminosilicate glass of Examples 1-42, weigh the raw materials according to the ratio of each raw material in Table 1, mix them thoroughly, put them into a platinum crucible, and put them into a resistance heating electric furnace at 1550°C for 5 hours melting and clarification. Pour the molten glass into a mold to form it, heat it at 580°C for 30 minutes for annealing, and then cool it to room temperature with the furnace to obtain a glass block. The glass blocks were made into standard specimens to test the density, coefficient of thermal expansion, modulus of elasticity and flexural strength. The relevant data are shown in Table 2.

[0097] Wherein, the density is measured according to GB / T5432-2008 standard.

[009...

Embodiment 11

[0121] The glass in Example 11 is a typical soda-lime-silica glass, since it does not contain Al substantially 2 o 3 , so the material of the crystallization layer obtained after ion exchange is lithium silicate. It can be seen from the table that its strengthening effect is poor.

[0122] In Examples 12-36, aluminosilicate glass with the same composition was used for strengthening under different spraying process parameters. Among them, pure LiCl is used for spraying in Examples 12-31, and the ion exchange time and ion exchange temperature are different. The results show that ion exchange can be carried out at 650 ° C to 825 ° C for 3 minutes to 15 minutes to obtain a crystallized layer , and the more suitable ion exchange temperature is 800°C, and the more suitable ion exchange time is 10min. It can be seen from Examples 26 and 32-36 that when the composition of the strengthening treatment agent is 85%wtLiCl+15%wtNaCl, the bending strength and light transmittance of the st...

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Abstract

The invention relates to a reinforcement method of aluminosilicate glass, which comprises the following steps: preheating aluminosilicate glass to 500-600 DEG C, wherein the aluminosilicate glass contains silicon dioxide, aluminum oxide and alkali oxide, and the alkali oxide is selected from at least one of sodium oxide and potassium oxide; coating a reinforcement treating agent on the surface of the aluminosilicate glass, wherein the reinforcement treating agent contains molten salts, the molten salts comprise 70-100% of lithium salt and 0-30% of sodium salts, the lithium salt is a mixture of at least one of lithium nitrate and lithium sulfate with lithium chloride or lithium chloride, and the sodium salt is selected from at least one of sodium chloride, sodium nitrate and sodium sulfate; and carrying out ion exchange on the reinforcement treating agent and aluminosilicate glass at 650-825 DEG C for 3-15 minutes to form a crystallized layer. The reinforcement method of aluminosilicate glass can enhance the strength of the reinforced glass, and has the advantage of short time consumption.

Description

technical field [0001] The invention relates to a strengthening method of aluminosilicate glass. Background technique [0002] In recent years, devices such as smartphones and tablet computers have become more and more popular, and they are showing a trend of thinning and lightweighting. One problem with thinning is that the strength of the glass decreases as the thickness decreases. In order to meet the requirements of use, the display glass must still have high strength at a small thickness. To achieve this, the glass needs to be strengthened. [0003] At present, in the composition of the aluminosilicate glass used, in order to ensure the ion exchange capacity and take into account factors such as glass meltability, formability, and devitrification resistance, the content of alkali metal oxides is relatively high. When strengthening aluminosilicate glass, because the glass is thin, the effect of physical toughening is not significant, so the chemical toughening method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B27/03
CPCC03C21/002
Inventor 王杏娟戴斌薛建鹏陈健
Owner CSG HOLDING
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