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

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 ...