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Chemically and thermally pre-stressable lithium aluminosilicate float glass of high temperature resistance

A float glass, thermal stability technology, used in glass tempering, glass manufacturing equipment, manufacturing tools, etc., can solve problems such as chemical tempering defects

Active Publication Date: 2005-11-09
SCHOTT AG
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  • Abstract
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AI Technical Summary

Problems solved by technology

Low Li 2 O content of 0.5-2% by weight means a defect for chemical tempering

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 33

[0135] In this example, which is not listed in Table 2, four plates measuring 250mm x 250mm x 5mm were prepared from glass No. 9 of Table 1 and polished on both sides. The panels were thermally tempered in a tempering furnace by heating to 700°C and then blowing cold air over them.

[0136] The refractory time was then tested for 120 minutes in a refractory test, compared to similarly thermally tempered alkali borosilicate glass of the same size. The test conditions were the same for both glass types.

[0137] As expected, no premature failure occurred for either glass; it was only possible to determine the main difference in deformation caused by the flow and subsequent expansion of the pane of glass; in the case of alkali borosilicate glass the largest deformation was at Between 24 and 28 mm, whereas the maximum deformation of the glass of Example 31 is only 6 mm. Such low deformation values ​​allow for very long fire resistance.

[0138] Further thermally tempered sample...

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Abstract

The invention provides a lithium aluminosilicate flat float glass with a high thermal stability which can be chemically and thermally tempered and is suitable for economical and environmentally friendly production. The lithium aluminosilicate flat float glass which can be chemically and thermally tempered, is refined without using a standard refining agent such as arsenic oxide and / or antimony oxide and has excellent thermal stability is constituted so as to contain 2.5-6.0 wt.% Li2O, 0<4 wt.% in total of Na2O+K2O, 0-4 wt.% B2O3, 15-30 wt.% Al2O3, 55-75 wt.% SiO2and <2 wt.% in total of TiO2+ZrO2(the undesirable crystallization of [beta]-quartz and / or keatite solid solution is prevented) as main components per the weight of the total compositions.

Description

technical field [0001] The present invention relates to a lithium aluminosilicate flat float glass with high thermal stability, which can be chemically and thermally tempered. Background technique [0002] Many specialty glass applications require flat glass, for example in the form of glass panes as viewing windows, for display purposes and as hard disk storage substrates. Such flat glass is produced from glass melts using known methods, such as rolling, drawing, casting or float. Float glass is widely used because it is economical and produces flat glass of high surface quality. [0003] The production of soda-lime glass and special glasses, such as borosilicate glass or aluminosilicate glass, by the float process is known. [0004] To increase the strength of glasses, they are chemically or thermally tempered in this technique. [0005] (Thermally tempered) fire-resistant glasses have been developed which meet the requirements of fire resistance class G (DIN 4102 part ...

Claims

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Application Information

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IPC IPC(8): C03B27/04C03C3/083C03C3/085C03C3/087C03C3/091C03C3/093C03C3/097C03C3/112C03C3/118C03C21/00G11B5/73
CPCC03C3/112C03C3/085C03C21/008C03C21/002C03C3/083C03C3/087C03C3/093C03C3/097C03C3/118
Inventor F·斯巴尔斯G·劳滕舒拉格K·舒奈德A·斯潘格
Owner SCHOTT AG
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