Alkali-doped and alkali-free boroaluminosilicate glass
First Claim
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1. A glass, the glass comprising:
- from about 50 mol % to about 70 mol % SiO2;
from greater than 6 mol % to 10 mol % Al2O3;
from 18 mol % to 30 mol % B2O3;
up to about 5 mol % MgO;
up to about 10 mol % CaO;
up to about 5 mol % SrO, and 0 mol % BaO, wherein MgO+CaO+SrO≦
Al2O3, and wherein a sum of alkali metal oxide modifiers is less than or equal to about 1 mol %.
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Abstract
Alkali-doped boroaluminosilicate glasses are provided. The glasses include the network formers SiO2, B2O3, and Al2O3. The glass may, in some embodiments, have a Young'"'"'s modulus of less than about 65 GPa and/or a coefficient of thermal expansion of less than about 40×10−7/° C. The glass may be used as a cover glass for electronic devices, a color filter substrate, a thin film transistor substrate, or an outer clad layer for a glass laminate.
28 Citations
66 Claims
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1. A glass, the glass comprising:
- from about 50 mol % to about 70 mol % SiO2;
from greater than 6 mol % to 10 mol % Al2O3;
from 18 mol % to 30 mol % B2O3;
up to about 5 mol % MgO;
up to about 10 mol % CaO;
up to about 5 mol % SrO, and 0 mol % BaO, wherein MgO+CaO+SrO≦
Al2O3, and wherein a sum of alkali metal oxide modifiers is less than or equal to about 1 mol %. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
- from about 50 mol % to about 70 mol % SiO2;
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22. A glass comprising SiO2, from 18 mol % to 30 mol % B2O3, from greater than 6 mol % to 10 mol % Al2O3, and 0 mol % BaO, wherein MgO+CaO+SrO≦
- Al2O3, wherein a sum of alkali metal oxide modifiers is less than or equal to about 1 mol % and the glass is substantially free of P2O5, and wherein the glass has at least one of a Young'"'"'s modulus of less than 60 GPa and a coefficient of thermal expansion of less than about 40×
10−
7/°
C. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 66)
- Al2O3, wherein a sum of alkali metal oxide modifiers is less than or equal to about 1 mol % and the glass is substantially free of P2O5, and wherein the glass has at least one of a Young'"'"'s modulus of less than 60 GPa and a coefficient of thermal expansion of less than about 40×
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39. A glass laminate, the glass laminate comprising a core glass and a clad glass laminated onto an outer surface of the core glass, the clad glass comprising SiO2, from 18 mol % to 30 mol % B2O3, from greater than 6 mol % to 10 mol % Al2O3, and 0 mol % BaO, wherein MgO+CaO+SrO≦
- Al2O3, the clad glass is substantially free of P2O5, and a sum of alkali metal oxide modifiers in the clad glass is less than or equal to about 1 mol %, and wherein the clad glass has a first coefficient of thermal expansion of less than about 40×
10−
7/°
C. and the core glass has a second coefficient of thermal expansion that is greater than the first coefficient of thermal expansion. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
- Al2O3, the clad glass is substantially free of P2O5, and a sum of alkali metal oxide modifiers in the clad glass is less than or equal to about 1 mol %, and wherein the clad glass has a first coefficient of thermal expansion of less than about 40×
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53. A method of making a glass, the method comprising:
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a. providing a glass melt, the glass melt comprising from about 50 mol % to about 70 mol % SiO2, from 18 mol % to 30 mol % B2O3, from greater than 6 mol % to 10 mol % Al2O3, up to about 5 mol % MgO, up to about 10 mol % CaO, up to about 5 mol % SrO, and 0 mol % BaO, wherein MgO+CaO+SrO≦
Al2O3 and a sum of alkali metal oxide modifiers in the glass melt is less than or equal to about 1 mol %; andb. down-drawing the glass melt to form the glass. - View Dependent Claims (54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65)
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Specification