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Lithium aluminosilicate glass and glass ceramic produced therefrom, producing method and use

A technology of lithium aluminum silicate and glass ceramics, which is applied in the field of LAS glass ceramics and glass ceramics, which can solve the problems of deepening color, increasing difference in refractive index, increasing scattering, etc.

Pending Publication Date: 2021-08-31
SCHOTT AG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Increased refractive index difference increases scattering and darkens colors

Method used

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  • Lithium aluminosilicate glass and glass ceramic produced therefrom, producing method and use
  • Lithium aluminosilicate glass and glass ceramic produced therefrom, producing method and use
  • Lithium aluminosilicate glass and glass ceramic produced therefrom, producing method and use

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Embodiment Construction

[0219] For the limit line G 1 and G 2 Be applicable:

[0220] G 1 : Y*=1.83 c*+84.4;

[0221] G 2 : Y*=1.83·c*+86.1.

[0222] Table 1 contains the compositions and properties of crystallizable LAS glasses according to the invention and comparative glasses. Table 2 shows the properties of the crystallizable glass after transformation into a transparent glass-ceramic containing high quartz mixed crystals as the main crystal phase. Table 3 shows the properties after transition to glass ceramics containing keatite mixed crystals as the main crystal phase.

[0223] Crystallizable LAS glasses 1 to 11 according to the invention and comparative glasses 12 to 17 were obtained from the batch raw materials customary in the glass industry at a temperature of 1620° C. for 4 hours.

[0224] Optionally, the following ingredients are selected: lithium carbonate, aluminum oxide, aluminum hydroxide, aluminum metaphosphate, quartz sand, sodium and potassium nitrate, sodium and potassium c...

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Abstract

The invention relates to crystallizable lithium aluminosilicate glass used for manufacturing transparent glass ceramic. The crystallizable lithium aluminosilicate glass comprises following components, based on oxides: 3 wt% to 4.5wt% (not inclusive) of Li2O, 19-24wt% of Al2O3, 62-70wt% of SiO2, 0-1.5wt% of Na2O, 0-1.5wt% of K2O, 0.01wt% to 0.5wt% (not inclusive) of MgO, 0-1.5wt% of CaO, 0-1.5wt% of SrO, 0-3wt% of BaO, 0-3wt% of ZnO, 1.6wt% (not inclusive) to 2.8wt% of TiO2, 1wt% to 2.5wt% (not inclusive) of ZrO2, 0 to 4wt% (not inclusive) of P2O5, 0.005-0.025wt% of Fe2O3 and 0.1-2wt% of As2O3, with the condition of 1.3<Na2O+K2O+CaO+SrO+BaO<3.5 (based on wt%, the condition B1).

Description

technical field [0001] The invention relates to a crystallizable lithium aluminosilicate glass according to the preamble of claim 1 , which can be transformed into a LAS glass-ceramic. [0002] The invention also relates to glass-ceramics produced therefrom, to processes for their production and to their use. Background technique [0003] LAS glass ceramics are widely used due to their special material properties, such as their low coefficient of expansion associated with high temperature differential strength and temperature change stability, their high strength, their chemical stability and their transparency. In general, the thermal expansion behavior is set such that the material has a very low coefficient of expansion, typically α, over the temperature range of its application 20 / 700 <0±1.5·10 -6 / K. Requirements for use at high temperatures include that glass-ceramics maintain desired properties (e.g. thermal expansion, transmission, temperature resistance) durin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/12C03C1/00C03C1/04C03C3/097C03C3/087C03B32/02
CPCC03C10/0027C03C1/004C03C1/04C03C3/097C03C3/087C03B32/02C03C10/0045C03B27/012C03B19/1095
Inventor F·西贝斯E·韦斯
Owner SCHOTT AG
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