Method for improving strength and reducing strength dispersity of glass by high-temperature treatment and ion exchange and reinforced glass

A technology of strength dispersion and ion exchange, applied in the field of glass reinforcement and reinforced glass, can solve the problems of complex two-step process, inconvenient process manufacturing, increased cost, etc., and achieve good reinforcement effect, cost reduction, and good stability.

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

[0006] The two-step ion exchange process can obtain glass with small dispersion under certain conditions, but because the two-step method involves the use of KNO 3 / NaNO 3 Mix molten salt, the mixing ratio of molten salt is strictly controlled, and the replacement of molten salt also brings inconvenience to the process manufacturing, and at the same time increases the cost, and the two-step method has the problem of complicated process

Method used

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Embodiment Construction

[0014] After cleaning and drying the glass, place it in an ion exchange medium (molten salt) for 16 hours at 450°C, take it out from the ion exchange medium to obtain an ion exchange glass; then place the ion exchange glass directly in a muffle In the furnace, heat treatment at a high temperature of 300-350°C in air for 0.5-2.5 hours, and then cool naturally.

[0015] In the present invention, the ion exchange medium is made of 97% industrial pure KNO by weight 3 and additive 0.5% Al 2 o 3 , 2%K 2 CO 3 , 0.5% KOH composition.

[0016] The flexural strength of the glass was tested by double-ring method, and the strength distribution was analyzed by Weibull function. Table 1 compares the strength and dispersion coefficient of glass with different treatment temperatures and treatment times.

[0017] Table 1 Comparison of strength and dispersion coefficient of glass at different treatment temperatures and treatment times

[0018] Processing temperature

Processi...

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Abstract

The invention provides a method for improving the strength and reducing the strength dispersity of glass by high-temperature treatment and ion exchange and reinforced glass, belonging to the technical field of glass reinforcement. The method comprises the following steps of: placing and treating glass sheets in an ion exchange medium at 450 DEG C for 16 hours to obtain ion exchange glass; treating the ion exchange glass in air at 300-350 DEG C for 0.5-2.5 hours; and then naturally cooling, wherein the ion exchange medium comprises the following components in percentage by weight: 97 percent of industrial pure KNO3, 0.5 percent of Al2O3 as an additive, 2 percent of K2CO3 and 0.5 percent of KOH. The ion exchange glass has the advantages of high strength, low strength dispersity, simple process and low treatment cost, and the provided reinforced glass can be used as the windshield glass of rapid 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] Glass is widely used in the fields of construction, automobile, aviation and aerospace because of its good light transmission performance and simple processing and molding process. Due to the presence of microcracks on the surface of glass, the actual strength is 2 to 3 orders of magnitude lower than the theoretical strength, generally only 100 to 200 MPa. In order to improve the strength of the glass, people use the method of ion exchange, the Na of the glass + with KNO 3 K in molten salt + Make an exchange. Thanks to K + The radius ratio of Na + The large, glass surface creates a stress layer. The external force must first overcome the stress to make the gl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C21/00
Inventor 张保军许杰李文才赵芳红吴云龙马眷荣
Owner CHINA BUILDING MATERIALS ACAD
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