Method for chemically strengthening lithium-aluminum-silicon glass

Abstract

The invention discloses a method for chemically strengthening lithium-aluminum-silicon glass. The method comprises the following steps: 1) preheating the lithium-aluminum-silicon glass for the first time, and carrying out strengthening for the first time by adopting a mixed molten liquid of potassium nitrate and sodium nitrate as a strengthening salt solution, wherein the temperature of strengthening for the first time is 380-395 DEG C, and the time of strengthening for the first time is 4-6 hours; 2) performing heat dissipation on the glass subjected to strengthening treatment for the first time, and carrying out cleaning by adopting purified water; 3) preheating the glass obtained in the step (2) for the second time, and carrying out strengthening for the second time by adopting the mixed molten liquid of potassium nitrate and sodium nitrate as the strengthening salt liquid, wherein the temperature of strengthening for the second time is 395-410 DEG C, and the time of strengthening for the second time is 2-4 hours; and 4) performing heat dissipation on a product subjected to strengthening for the second time, and carrying out cleaning with the purified water so as to obtain strengthened lithium-aluminum-silicon glass. The method provided by the invention can improve CS and DOL of the product and better monitor the influence of a salt solution on strengthening performance, sothe product has good impact resistance and bending resistance.

Description

technical field

[0001] The technical field of glass preparation of the present invention particularly relates to a method for chemically strengthening lithium aluminum silicon glass. Background technique

[0002] Strengthened glass has been widely used in electronic devices such as mobile phones, tablet computers, notebooks, and electronic watches. Therefore, the performance index of tempered glass is also a quality standard for measuring a product. How to improve the performance of existing products has become the top priority.

[0003] Chemical strengthening is to place the product in a molten state of potassium nitrate or a mixed solution of sodium nitrate and potassium nitrate for a certain period of time. The Na+ ions with a smaller ionic radius in the glass and the larger K+ ions in the salt solution The ions are exchanged, and the Li+ ions in the glass are exchanged with the K+ ions and Na+ ions in the salt solution. Finally, compressive stress is formed on the sur...

Examples

Embodiment 1

[0040] The chemical strengthening method of lithium aluminum silicate glass, concrete steps are:

[0041] 1. Select lithium-aluminum-silicon products and preheat them in a preheating furnace. The preheating temperature is 360°C and the time is 2 hours;

[0042] 2. The preheated product is strengthened once, and the ratio of sodium nitrate:potassium nitrate=65% is selected for the strengthening liquid. Strengthening time: 6h, strengthening temperature: 380°C.

[0043] 3. After the product is strengthened, move the product to the preheated furnace, open the furnace cover, turn off the heating switch, and cool down with the room temperature. When it is cooled to 100°C, perform pure water cleaning. The conditions for pure water cleaning are: rinse with pure water in two sinks in sequence. The temperature of pure water in the first sink is 55°C for 1 hour. The temperature of the pure water in the water is normal temperature, and the soaking time is: 1h. The pure water in the two...

Embodiment 2

[0050] The chemical strengthening method of lithium aluminum silicate glass, concrete steps are:

[0051] 1. Select lithium-aluminum-silicon products and preheat them in a preheating furnace. The preheating temperature is 370°C and the time is 3 hours;

[0052] 2. The preheated product is strengthened once, and the ratio of the strengthening liquid is: sodium nitrate: potassium nitrate = 75%. Strengthening time: 4h, strengthening temperature: 395°C.

[0053] 3. After the product is strengthened, move the product to the preheated furnace, open the furnace cover, and turn off the furnace heating switch, and cool down with the room temperature. When it is cooled to 100°C, perform pure water cleaning. The conditions for pure water cleaning are as follows: use pure water in two tanks for cleaning in sequence, the water tanks are flowing water, the water temperature in the first tank is 75°C, and the time is 30 minutes. , the temperature of the pure water in the second water tank ...

Embodiment 3

[0059] The chemical strengthening method of lithium aluminum silicate glass, concrete steps are:

[0060] 1. Select lithium-aluminum-silicon products and preheat them in a preheating furnace. The preheating temperature is 380°C and the time is 2.5 hours;

[0061] 2. The preheated product is strengthened once, and the proportion of the strengthening liquid is: sodium nitrate: potassium nitrate = 85%, and 0.5wt% of silicic acid is added to the strengthening liquid. Strengthening time: 5h, strengthening temperature: 390°C.

[0062] 3. After the product is strengthened, move the product to the preheated furnace, open the furnace cover, and turn off the furnace heating switch, and cool down with the room temperature. When cooled to 100°C, clean with pure water. The conditions for pure water cleaning are: clean with pure water from two tanks in sequence, the water tank is flowing water, the water temperature in the first tank is 65°C, and the time is 45 minutes. , the pure water t...

technical field

[0001] The technical field of glass preparation of the present invention particularly relates to a method for chemically strengthening lithium aluminum silicon glass. Background technique

[0002] Strengthened glass has been widely used in electronic devices such as mobile phones, tablet computers, notebooks, and electronic watches. Therefore, the performance index of tempered glass is also a quality standard for measuring a product. How to improve the performance of existing products has become the top priority.

[0003] Chemical strengthening is to place the product in a molten state of potassium nitrate or a mixed solution of sodium nitrate and potassium nitrate for a certain period of time. The Na+ ions with a smaller ionic radius in the glass and the larger K+ ions in the salt solution The ions are exchanged, and the Li+ ions in the glass are exchanged with the K+ ions and Na+ ions in the salt solution. Finally, compressive stress is formed on the sur...

Examples

Embodiment 1

[0040] The chemical strengthening method of lithium aluminum silicate glass, concrete steps are:

[0041] 1. Select lithium-aluminum-silicon products and preheat them in a preheating furnace. The preheating temperature is 360°C and the time is 2 hours;

[0042] 2. The preheated product is strengthened once, and the ratio of sodium nitrate:potassium nitrate=65% is selected for the strengthening liquid. Strengthening time: 6h, strengthening temperature: 380°C.

[0043] 3. After the product is strengthened, move the product to the preheated furnace, open the furnace cover, turn off the heating switch, and cool down with the room temperature. When it is cooled to 100°C, perform pure water cleaning. The conditions for pure water cleaning are: rinse with pure water in two sinks in sequence. The temperature of pure water in the first sink is 55°C for 1 hour. The temperature of the pure water in the water is normal temperature, and the soaking time is: 1h. The pure water in the two...

Embodiment 2

[0050] The chemical strengthening method of lithium aluminum silicate glass, concrete steps are:

[0051] 1. Select lithium-aluminum-silicon products and preheat them in a preheating furnace. The preheating temperature is 370°C and the time is 3 hours;

[0052] 2. The preheated product is strengthened once, and the ratio of the strengthening liquid is: sodium nitrate: potassium nitrate = 75%. Strengthening time: 4h, strengthening temperature: 395°C.

[0053] 3. After the product is strengthened, move the product to the preheated furnace, open the furnace cover, and turn off the furnace heating switch, and cool down with the room temperature. When it is cooled to 100°C, perform pure water cleaning. The conditions for pure water cleaning are as follows: use pure water in two tanks for cleaning in sequence, the water tanks are flowing water, the water temperature in the first tank is 75°C, and the time is 30 minutes. , the temperature of the pure water in the second water tank ...

Embodiment 3

[0059] The chemical strengthening method of lithium aluminum silicate glass, concrete steps are:

[0060] 1. Select lithium-aluminum-silicon products and preheat them in a preheating furnace. The preheating temperature is 380°C and the time is 2.5 hours;

[0061] 2. The preheated product is strengthened once, and the proportion of the strengthening liquid is: sodium nitrate: potassium nitrate = 85%, and 0.5wt% of silicic acid is added to the strengthening liquid. Strengthening time: 5h, strengthening temperature: 390°C.

[0062] 3. After the product is strengthened, move the product to the preheated furnace, open the furnace cover, and turn off the furnace heating switch, and cool down with the room temperature. When cooled to 100°C, clean with pure water. The conditions for pure water cleaning are: clean with pure water from two tanks in sequence, the water tank is flowing water, the water temperature in the first tank is 65°C, and the time is 45 minutes. , the pure water t...

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