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Glass annealing method and application thereof

A glass and annealing technology, which is applied to the glass annealing method and its application field of float production, and can solve the problems of low strength and uneven glass

Active Publication Date: 2016-03-02
CDGM OPTICAL GLASS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although the existing process of this kind can strengthen the glass to improve its tempering performance, usually in the production process, due to the high content of refractory Al in the components 2 o 3 The resulting glass inhomogeneity and the stress inhomogeneity caused by the float glass in the annealing process make its own strength significantly lower than the theoretical strength, so the tempering performance of the glass obtained after actual strengthening is significantly lower than the glass tempering performance in the expected design

Method used

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  • Glass annealing method and application thereof
  • Glass annealing method and application thereof
  • Glass annealing method and application thereof

Examples

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Embodiment 2

[0047] In Example 2, the tempering stress values ​​obtained at different tempering temperatures are different. Generally speaking, within the same tempering time, the higher the tempering temperature, the deeper the stress layer of the glass and the lower the stress value. The dispersion of the stress value after glass tempering has no obvious relationship with the tempering temperature of the glass. Generally, the tempering temperature of glass suitable for chemical tempering has a relatively wide range, and tempered glass that meets the tempering performance can be obtained with the tempering time.

Embodiment 3

[0048] In Example 3, the influence of different annealing holding temperatures on the toughening performance, generally speaking, when the annealing temperature is lowered, the time for reorganization of the internal structure of the glass will be lengthened. Under the same holding time, when the temperature is higher, the glass interior reaches The degree of balance will increase. But there is a premise here, because the glass plate will be deformed by its own gravity during the annealing process, so a relatively low temperature should be selected during the annealing process or a short time should be kept at high temperature to prevent glass deformation. The heat preservation time of the sample is 6 hours, and the glass can achieve the purpose of improving the tempering performance.

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Abstract

The invention discloses a glass annealing method and application thereof, and particularly relates to a float-produced glass annealing method and application thereof. The glass annealing method comprises the steps that the temperature of glass is increased to T1 DEG C, and T1 is the glass-transition temperature Tg or temperature 10 DEG C-30 DEG C below the Tg when the glass is prepared; after heat preservation is performed on the glass for 1-20 hours at T1 DEG C, the temperature is lowered to T2 DEG C at the constant speed, a temperature difference value of the T1 and the T2 serves as a temperature lowering range, and the temperature lowering range is 60 DEG C-120 DEG C; in the temperature lowering range, the temperature lowering rate of the temperature of the glass is kept at minus 60 DEG C / h-minus 2 DEG C / h. According to the glass prepared through the glass annealing method, the stress distribution is more uniform, surface stress values are determined according to a surface stress method, and the dispersion coefficients of the surface stress values can be controlled within 0.05 after statistical calculation is performed.

Description

technical field [0001] The invention relates to a glass annealing method and its application, in particular to a glass annealing method produced by a float method and its application. Background technique [0002] Chemically strengthened glass is glass that will be suitable for chemical strengthening, such as Na 2 O-Al 2 o 3 -SiO 2 The glass of the system is immersed in a solution containing potassium ions to exchange Na-K ions, such as KNO 3 solution, so as to obtain the strengthened glass with high pressure stress on the surface. After the glass is strengthened, the hardness, scratch resistance and impact resistance of the glass will be significantly improved. [0003] Although the existing process of this kind can strengthen the glass to improve its tempering performance, usually in the production process, due to the high content of refractory Al in the components 2 o 3 The resulting glass inhomogeneity and the stress inhomogeneity caused by the float glass in the ...

Claims

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Application Information

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IPC IPC(8): C03B25/00
Inventor 王东俊陈雪梅李小春龚财云蒋焘
Owner CDGM OPTICAL GLASS
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