Alkali-aluminosilicate glass
AssigneeTaiwan Glass Inc. Corp.
InventorsChia-Hung Lin, Sven Wiltzsch, Lars Bienneck, Gunter Carl, Hans-Juergen Linz
Life of this patent
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Abstract
The present disclosure relates to an alkali-aluminosilicate glass which contains between 47.5 and 55 wt.% SiO2, between 21 and 27.5% Al2O3; and between 12 and 16 wt.% Na2O. The molar ratio of Al2O3 and Na2O amounts to between 1:0.9 and 1:1.2. This glass is characterized by high hardness and high surface strengths after its chemical toughening, whereby the resulting extremely high scratch resistance favors its use as a display glass. A further preferred feature of this glass is its much lower viscosity for this group of glasses.
Claims18
A glass, comprising between 47.5 and below 55 wt. % SiO2;
- between 21 and 27.5 wt. % Al2O3;
- and between 12 and 16 wt. % Na2O;
- and in that a molar ratio of Al2O3 to Na2O lies between 0.94:1 and 1.1:1;
- wherein the glass is free of CaO;
- wherein the glass includes between 4.5 and 6 wt. % MgO;
- wherein the glass contains between 1.5 and 2.5 wt. % K2O;
- wherein the glass contains between >0 and 1 wt. % SnO2;
- wherein the glass contains between >0 and 0.6 wt. % CeO2;
- wherein the glass contains between 1.8 and 3.5 wt. % ZrO2;
- and wherein the glass has a pre-hardening Vickers hardness of between 6400 and 6600 MPa.
A glass article comprising:
- a glass comprising between 47.5 and below 55 wt. % SiO2;
- between 21 and 27.5 wt. % Al2O3;
- between 4.5 and 6 wt. % MgO;
- and between 12 and 16 wt. % Na2O;
- and wherein a molar ratio of Al2O3 to Na2O lies between 0.94:1 and 1.1:1, wherein the glass has a diffusion layer at least sectionally at its surface, wherein a K content of the glass is increased with respect to a base composition and a Li content and a Na content of the glass are lowered with respect to the base composition, wherein the glass is free of CaO, wherein the glass includes between 1.5 and 2.5 wt. % K2O, wherein the glass includes between >0 and 1 wt. % SnO2, wherein the glass includes between >0 and 0.6 wt. % CeO2, wherein the glass contains between 1.8 and 3.5 wt. % ZrO2, and wherein the glass has a pre-hardening Vickers hardness of between 6400 and 6600 MPa.
Dependencies are inferred from the claim text.