Method for improving glass strength and reducing strength dispersion by adopting variable-temperature two-step ion exchange and reinforced glass

A technology of strength dispersion and ion exchange, applied in the field of glass reinforcement and reinforced glass, it can solve the problems of high temperature and low glass strength in two-step processing, and achieve the effects of good glass stability, simple processing technology and high strength.

Inactive Publication Date: 2010-12-22
CHINA BUILDING MATERIALS ACAD
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Problems solved by technology

However, this method has problems such as low glass strength due to the relatively high temperature of the two-step treatment.

Method used

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  • Method for improving glass strength and reducing strength dispersion by adopting variable-temperature two-step ion exchange and reinforced glass
  • Method for improving glass strength and reducing strength dispersion by adopting variable-temperature two-step ion exchange and reinforced glass
  • Method for improving glass strength and reducing strength dispersion by adopting variable-temperature two-step ion exchange and reinforced glass

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Embodiment Construction

[0017] The invention adopts a two-step temperature-changing ion exchange method to increase the strength of the glass and reduce the dispersion of the glass strength. The variable temperature two-step ion exchange is carried out in a two-slot tempering furnace. Such as figure 1 As shown, the heating temperature difference between the two tanks is achieved by using different arrangement positions of the heating wires. The high temperature tank can realize the change of 450℃~550℃, and the low temperature tank can realize the change of 380℃~450℃. The ion exchange medium consists of 97% commercially pure KNO by weight 3 and 0.5% Al 2 o 3 , 2%K 2 CO 3 , 0.5% KOH is used as an additive composition, which is added to the high temperature tank and the low temperature tank. The original glass sheet undergoes two steps of ion exchange, the first step is high temperature treatment, ion exchange is carried out in a high temperature tank, the temperature range is 490 ° C ~ 510 ° C, ...

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Abstract

The invention provides a method for improving glass strength and reducing strength dispersion by adopting variable-temperature two-step ion exchange and reinforced glass, belonging to the technical field of glass reinforcement. The method comprises the step of sequentially processing glass substrates in an ion exchange medium at high temperature and low temperature, wherein during high-temperature processing, the temperature is between 490 and 510 DEG C, and the processing time lasts for 0.5h -1h; during low-temperature processing, the temperature is between 400 and 420 DEG C, and the processing time lasts for 48h-72h; and the ion exchange medium comprises 97% of industrial pure KNO3, 0.5% of Al2O3, 2% of K2CO3 and 0.5% of KOH. The variable-temperature two-step iron-exchange glass has high glass strength and good stability and can make up the shortage of the performance of the traditional single-step iron-exchange glass, and the reinforced glass provided in the invention can be used as windshield glass for high-speed trains, airplanes and the like.

Description

technical field [0001] The invention belongs to the field of glass materials and relates to a glass strengthening technology, in particular to a method for increasing glass strength and reducing strength dispersion through ion exchange and the reinforced glass obtained by the method. Background technique [0002] In the field of glass manufacturing, ion exchange is commonly used to increase the strength of glass. The thickness of the stress layer of the traditional single-step ion exchange glass is small, and the maximum stress is at a relatively shallow position on the glass surface. The existence of defects makes the glass easy to expand rapidly from the defects when it is stressed, which reduces the strength of the glass and increases the dispersion of the glass strength. [0003] In recent years, Green et al. (D J Green, R Tandon, V M Sglavo. Crack arrest and multiple cracking in glass through the use of designed residual stress profiles [J]. Science, 283 (1999) 1295.) ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C21/00
Inventor 张保军许杰赵芳红吴云龙霍永琛马眷荣
Owner CHINA BUILDING MATERIALS ACAD
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