Chemical tempering method for glass

A chemical tempering and glass technology, applied in the field of glass preparation, can solve problems such as time-consuming and chemical solution replacement, and achieve the effects of improving efficiency, increasing strength and reducing costs

Inactive Publication Date: 2020-04-10
北海市龙浩光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing chemical tempering method takes a long time, and the chemical solution used needs to be replaced frequently

Method used

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  • Chemical tempering method for glass
  • Chemical tempering method for glass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Preheating for the first time: place the 0.55mm thick glass to be tempered in the preheating furnace of the automatic tempering furnace equipment, and preheat for 1 hour at a temperature of 300°C to obtain the first preheated piece;

[0022] (2) The first tempering: immerse the preheated parts for the first time in the potassium nitrate molten salt of the tempering furnace of the automatic tempering furnace equipment, in which sodium ions account for 0 wt% of the total amount of metal ions, and the first time is carried out at a temperature of 410 ° C. Ion exchange for 6 hours to obtain the first tempered piece;

[0023] (3) The first drop of salt: raise the first tempered piece and drop the salt for 10 minutes;

[0024] (4) The first annealing: After the salt drop is completed, move the first tempered piece to the annealing furnace of the tempering furnace equipment, anneal for 2 hours, reduce the temperature to below 100°C, and take it out of the furnace to obtain...

Embodiment 2

[0030] (1) Preheating for the first time: place the 0.55mm thick tempered glass in the preheating furnace of the automatic tempering furnace equipment, preheat for 3 hours at a temperature of 100°C, and obtain the first preheated part;

[0031] (2) The first tempering: the first preheated piece is immersed in the potassium nitrate molten salt of the tempering furnace of the automatic tempering furnace equipment, wherein sodium ions account for 0.6wt% of the total amount of metal ions, and the temperature is 420°C. One time of ion exchange for 5 hours to obtain the first tempered piece;

[0032] (3) The first drop of salt: raise the first tempered piece and drop the salt for 20 minutes;

[0033] (4) The first annealing: After the salt drop is completed, move the first tempered piece to the annealing furnace of the tempering furnace equipment, anneal for 3 hours, reduce the temperature to below 100°C, and take it out of the furnace to obtain the first annealed piece;

[0034] (...

Embodiment 3

[0039] This embodiment is comparative example one

[0040] (1) Preheating: Put the 0.55mm thick Corning 2320 glass to be tempered into a preheating furnace, and preheat for 3 hours at a temperature of 200°C.

[0041] (2) Tempering: transfer the preheated Corning 2320 glass into a tempering furnace containing molten salt (potassium nitrate containing 0.1% sodium ions), and perform ion exchange at a temperature of 420°C for 6h30min.

[0042](3) Dropping salt: drop salt on the tempered Corning 2320 glass for 30 minutes

[0043] (4) Annealing: Transfer the Corning 2320 glass after dripping salt to an annealing furnace, cool slowly to 320°C, and after 3.5 hours, take it out of the furnace for salt washing test.

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Abstract

The invention discloses a chemical tempering method for glass. The chemical tempering method mainly comprises the following steps: preheating aluminosilicate glass at 100-300 DEG C for 1-3 hours; immersing a first preheated part into a first molten salt, and carrying out primary ion exchange for 5-6 hours at the temperature of 410-420 DEG C; rising an obtained first tempered part for dripping saltfor 10-20 minutes; annealing the first tempered part for 2-3 hours to reduce the temperature to be lower than 100 DEG C; standing an obtained first annealed part for 10-30 min, and preheating the first annealed part for 1-3 h at the temperature of 100-300 DEG C; immersing a second preheated part into a second molten salt, and carrying out primary ion exchange for 10-20 minutes at the temperatureof 380-400 DEG C; rising a second tempered part for dripping salt for 10-20 minutes; and carrying out direct drop annealing on the second tempered part to finish tempering. According to the chemical tempering method, the thickness of a stress layer is increased by adopting a relatively high temperature in the first tempering process, and the surface stress is increased by adopting a relatively lowtemperature and an annealing direct drop mode in the second tempering, so that the strength is ensured, the time required by tempering is greatly shortened, frequent replacement of molten salt is avoided, the cost is reduced, and the efficiency is improved.

Description

technical field [0001] The invention relates to a chemical tempering method for glass, which belongs to the technical field of glass preparation. Background technique [0002] With the continuous increase of smartphone screens, glass has become one of the important structural parts in the structural design of the whole machine. During the destructive test, the drop test of the whole machine often breaks the touch glass cover. The theoretical strength of ordinary flat glass is greater than 10,000MPa, but the test results show that the actual strength of the glass is only 30-80MPa. Factors affecting the actual strength of glass: such as storage environment, surface machining, sample size, mechanical scratches, and internal defects such as bubbles, stones, etc. Among them, the existence of microcracks has the greatest impact on the actual strength of glass, especially the microcracks on the outer surface of the glass. The causes of microcracks can be summarized as internal def...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C21/00
CPCC03C21/002
Inventor 石大恒郭权龙
Owner 北海市龙浩光电科技有限公司
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