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A method of chemically tempering cover glass capable of reducing defect rate

A technology of cover glass and chemical tempering, which is applied in glass tempering, glass production, glass manufacturing equipment, etc., and can solve problems such as poor tempering

Active Publication Date: 2019-05-28
DONGXU OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The chemical toughening of the cover glass is to put the glass into the molten salt liquid at 400-500 ℃, and use the difference in the volume of alkali ions to form the surface compressive stress of the glass through ion exchange. Depending on the type, size, and edge treatment, the breakage rate is above 40%, resulting in poor tempering, and the preheated glass is also about 10% defective before and after tempering due to improper preheating temperature.

Method used

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  • A method of chemically tempering cover glass capable of reducing defect rate
  • A method of chemically tempering cover glass capable of reducing defect rate
  • A method of chemically tempering cover glass capable of reducing defect rate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) 84 samples of cover glass with the same size and thickness, no melting defects, and after grinding, chamfering and annealing were placed in a vertical stainless steel sample holder, and the cover glass was separated vertically Place it on the sample rack, then put the sample rack carrying the cover glass sample into an oven and heat it up to 240°C, and keep it at a constant temperature for 10 minutes; quench the constant temperature cover glass with 25°C water cold;

[0043] (2) Raise the temperature of the cover glass sample that has not exploded after quenching to 248°C, and keep it at this temperature for 10 minutes;

[0044] (3) Raise the temperature of the cover glass sample that has not burst after quenching to 8°C higher than the last constant temperature, and repeat step (2) until all the cover glass samples burst, and the temperature of each heating is higher than that of the previous constant temperature. At the last constant temperature of 8°C;

[0045]...

Embodiment 2

[0054] (1) 100 samples of cover glass with the same size and thickness, no melting defects, and after grinding, chamfering and annealing are placed in side-shaped stainless steel partition brackets, and the cover glass is placed on the side placed on the sample rack separately, and then put the sample rack carrying the cover glass sample into an oven to raise the temperature to 180°C, and keep it at a constant temperature for 15 minutes; water quenching;

[0055] (2) Raise the temperature of the cover glass sample that has not exploded after quenching to 190°C, and keep it at this temperature for 15 minutes;

[0056] (3) Raise the temperature of the cover glass sample that has not exploded after quenching to 10°C higher than the last constant temperature, and repeat step (2) until all the cover glass samples burst, and the temperature of each heating is higher than At the last constant temperature of 10°C;

[0057] The number of effective cycles with cover glass bursting aft...

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Abstract

The invention discloses a method for chemically tempering cover glass capable of reducing defective rate, the method comprises preheating the cover glass to the preheating temperature T2, and then putting the cover glass into the tempered molten salt liquid; wherein, the method further comprises the steps of: The measurement method of the step is measured to obtain the preheating temperature T2: (1), a plurality of samples of the cover glass are heated to G, and kept at a constant temperature at this temperature for 5-15 minutes, and the constant temperature cover glass is used with L Quenching liquid quenching; (2), with the cover glass sample that does not burst after quenching, replace the G cycle of the previous cycle with the G' of the new cycle to repeat the operation of step (1); (3 ), cycle through step (2) until all the cover glass samples burst; then calculate the preheating temperature T2. After preheating at the above preheating temperature, chemical tempering can make the breakage rate of the cover glass less than 2%, which greatly reduces the defect rate and obtains better production efficiency.

Description

technical field [0001] The invention relates to glass tempering technology, in particular to a method for chemically tempering cover glass capable of reducing defective rate. Background technique [0002] The chemical toughening of the cover glass is to put the glass into the molten salt liquid at 400-500 ℃, and use the difference in the volume of alkali ions to form the surface compressive stress of the glass through ion exchange. Depending on the type, size, and edge treatment, the breakage rate is above 40%, resulting in poor tempering, and the preheated glass is about 10% defective before and after tempering due to improper preheating temperature. Contents of the invention [0003] The object of the present invention is to provide a method for chemically toughening cover glass that can reduce the defect rate. After the cover glass is preheated at the preheating temperature determined by the method of the present invention, it is chemically toughened, and the breakage r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B27/03
CPCY02P40/57
Inventor 李刚李俊锋闫冬成王丽红郑权
Owner DONGXU OPTOELECTRONICS TECH CO LTD