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High-strength alkali-aluminosilicate glass

A technology of aluminosilicate glass and alkali metal, which is applied in the fields of instruments, electrical digital data processing, transportation and packaging, etc., and can solve the problem of low liquidus viscosity

Inactive Publication Date: 2013-12-11
KORNERSTONE MATERIALS TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such liquidus viscosities are too low to be successfully used in the down-draw process

Method used

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  • High-strength alkali-aluminosilicate glass
  • High-strength alkali-aluminosilicate glass

Examples

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Embodiment Construction

[0064] The glass compositions listed in Table 1 below were melted and refined using high purity feedstock from the mixture in a 2 liter pan, which was directly heated electrically at 1580°C. The molten mass was then homogenized using mechanical agitation.

[0065] The molten mass is then processed into rods or billets.

[0066] The ion exchange treatment is then carried out in an electrically heated pan salt bath furnace. The treatment temperature is selected on the basis of the respectively measured transition temperature of the glass which is less than the transition temperature 90-120K. Ion exchange treatment times vary from 2 to 16 hours.

[0067] The measurement of the surface compressive stress of the glass and the depth of the compressive stress layer (based on birefringence) were determined by using a polarizing microscope (Berek compensator) on a section of the glass. The compressive stress of the glass surface was calculated from the measured birefringence assumin...

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Abstract

The invention provides high-strength alkali-aluminosilicate glass. The alkali-aluminosilicate glass is characterized by excellent meltability, fineability and processibility. The alkali-aluminosilicate glass is showed in the following formula: 60.5 to 69.0 weight percent of SiO2; 7.0 to 11.8 weight percent of Al2O3; 0 to 4.0 weight percent of B2O3; 2.0 to 8.5 weight percent of MgO; 0 to 4.0 weight percent of CaO; 0 to 5.0 weight percent of ZnO; 0 to 3.0 weight percent of ZrO2; 15.0 to 17.5 weight percent of Na2O; 0 to 2.7 weight percent of K2O; 0 to 2.0 weight percent of Li2O; and 0 to 1.5 weight percent of a fining agent such as As2O3, Sb2O3 CeO2, SnO2, Cl-, F-, (SO4) 2- and combinations thereof. The glass allows for adequate conditions for an alkali ion exchange treatment in a short time period (4 to 8 hours) and can also be produced according to the established, continuous, vertically downward directed drawing process such as the overflow down-draw method or the fusion method, the die slot or the slot down-draw method, or combinations thereof. The viscosity-temperature profile of the glass allows the use of the conventional fining agents in combination at the lowest amounts possible and additionally allows the production of the glass that are free of or contain only small amounts of either or both of antimony oxide and arsenic oxide.

Description

technical field [0001] The present invention relates to high-strength alkali-aluminosilicate glass, a method for producing the high-strength alkali-aluminosilicate glass and applications and uses of the high-strength alkali-aluminosilicate glass. Background technique [0002] The recent increase in popularity and use of mobile computing and communication devices has created a need for cover glass (cover glass) for touch panels, for protecting displays, and for improving the appearance of such devices. Due to the need for such devices to be small and lightweight, the cover glass used in such devices must be as thin and lightweight as possible. Therefore, a need arises to manufacture a cover glass that meets these requirements but at the same time maintains sufficient durability not to crack or break when the device is dropped by a user and is extremely scratch resistant. Such conflicting requirements make it highly desirable to increase the strength of such cover glasses. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/087C03C3/091C03C21/00G06F3/041G06F3/044
CPCC03C3/087C03C3/091C03C21/002G06F3/041Y10T428/315C03C21/00C03C3/085
Inventor B·屈内曼M·伯特格S·拉特克
Owner KORNERSTONE MATERIALS TECH
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