Optically detectable, floatable, arsenic- and antimony-free, ceramisable lithium-aluminium-silicate glass

Abstract

Optically detectable, arsenic- and antimony free, ceramic lithium-aluminosilicate float glass, in prestressed from, comprises e.g. silicon dioxide (55-69 wt.%), aluminum oxide (19-25 wt.%), lithium oxide (3.2-5 wt.%), sodium oxide (0-1.5 wt.%), potassium oxide (0-1.5 wt.%), magnesium oxide (0-2.2 wt.%), calcium oxide (0-2 wt.%), strontium oxide (0-2 wt.%), barium oxide (0-2.5 wt.%), zinc oxide (0 to less than 1.5 wt.%), titanium dioxide (1-3 wt.%), zirconium oxide (1-2.5 wt.%), tin oxide (0.1 to less than 1 wt.%), phosphorus pentoxide (0-3 wt.%) and boric oxide (0-2 wt.%). Optically detectable, arsenic- and antimony free, ceramic lithium-aluminosilicate float glass, in prestressed from, comprises silicon dioxide (55-69 wt.%), aluminum oxide (19-25 wt.%), lithium oxide (3.2-5 wt.%), sodium oxide (0-1.5 wt.%), potassium oxide (0-1.5 wt.%), magnesium oxide (0-2.2 wt.%), calcium oxide (0-2 wt.%), strontium oxide (0-2 wt.%), barium oxide (0-2.5 wt.%), zinc oxide (0 to less than 1.5 wt.%), titanium dioxide (1-3 wt.%), zirconium oxide (1-2.5 wt.%), tin oxide, (0.1 to less than 1 wt.%), phosphorus pentoxide (0-3 wt.%), neodymium oxide (0.01-0.6 wt.%, or 100-3000 ppm), cobalt oxide (0-0.005 wt.%), fluorine (0-1 wt.%) and boric oxide (0-2 wt.%), where the sum of titanium dioxide, zirconium oxide and tin oxide is 2.5-5 wt.%.

Description

Technical field [0001] The invention relates to a ceramizable lithium-aluminosilicate glass that is free of arsenic and antimony and can be optically detected and can be prepared by a float method, and can be prestressed. The invention also relates to the conversion of the lithium-aluminosilicate glass. Glass ceramics. Background technique [0002] Plates made of glass ceramics and their precursor glasses are especially widely used in cooking countertops (Kochfelder), oven trays, fireplace display panels and fire-resistant windows due to their excellent thermal properties. In many applications of the glass, in order to increase the strength as a safety glass or to protect people, the glass plate is prestressed by thermal or chemical methods. [0003] In order to achieve high optical quality, the glass is prepared by the float process. Transparent glass panels can no longer be visually distinguished from window glass (potassium-sodium glass). Compared with other forming methods, t...

AI Technical Summary

Problems solved by technology

However, tin clarification also has disadvantages, especially when it is ceramicized, it produces interfering Sn/Ti colored complexes that absorb in the short-wave to medium-wave part of visible light

Although this col

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