Coated article including soda-lime-silica glass substrate with lithium and/or potassium to reduce sodium migration and/or improve surface stability and method of making same
First Claim
Patent Images
1. A coated article comprising:
- a glass substrate;
a low-E coating supported by the glass substrate, the low-E coating including at least one infrared (IR) reflecting layer comprising silver sandwiched between at least first and second dielectric layers;
wherein the glass substrate is comprised of a glass composition comprising;
Ingredientwt. % SiO267-75%
wherein the glass composition of the glass substrate further comprises from about 0.1 to 6.0% lithium oxide in order to reduce mobility of alkali ions in the glass substrate and thus reduce sodium migration.
Na2O6-20%CaO5-15%Al2O3
0-7%K2O
0-7%
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Abstract
A coated article includes a glass substrate that supports a coating such as a low-E (low emissivity) coating. In certain example embodiments, the glass substrate is formed of a soda-lime-silica based glass composition manufactured using a float process. In certain example embodiments, lithium oxide (e.g., LiO2) and/or potassium oxide (K2O) is used in the soda-lime-silica based glass substrate in order to reduce sodium migration and/or improve surface stability. Such coated articles are useful, for example and without limitation, in architectural, vehicular and/or residential glass window applications.
41 Citations
22 Claims
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1. A coated article comprising:
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a glass substrate;
a low-E coating supported by the glass substrate, the low-E coating including at least one infrared (IR) reflecting layer comprising silver sandwiched between at least first and second dielectric layers;
wherein the glass substrate is comprised of a glass composition comprising;
Ingredient wt. % SiO2 67-75% Na2O 6-20% CaO 5-15% Al2O3
0-7%K2O
0-7%wherein the glass composition of the glass substrate further comprises from about 0.1 to 6.0% lithium oxide in order to reduce mobility of alkali ions in the glass substrate and thus reduce sodium migration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A coated article comprising:
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a glass substrate;
a low-E coating supported by the glass substrate, the low-E coating including at least one infrared (IR) reflecting layer;
wherein the glass substrate is comprised of a glass composition comprising;
Ingredient wt. % SiO2 67-75% Na2O 6-20% CaO 5-15% Al2O3
0-7%wherein the glass composition of the glass substrate further comprises from about 0.1 to 6.0% lithium oxide and/or potassium oxide in order to reduce mobility of alkali ions in the glass substrate. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A heat treated coated article comprising:
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a heat treated glass substrate;
a low-E coating supported by the glass substrate, the low-E coating including at least one infrared (IR) reflecting layer comprising silver;
wherein the glass substrate is comprised of a glass composition comprising;
Ingredient wt. % SiO2 67-75% Na2O 6-20% CaO 5-15% Al2O3
0-7%K2O
0-7%wherein the glass composition of the heat treated glass substrate further comprises from about 0.1 to 6.0% lithium oxide. - View Dependent Claims (20)
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21. Heat treated glass comprising:
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22. A method of making soda-lime-silica based glass, the method comprising:
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providing a glass formulation comprising;
Ingredient wt. % SiO2 67-75% Na2O 6-20% CaO 5-15% Al2O3
0-7%reducing the amount of Na2O in the glass composition and replacing it with from about 0.1 to 6.0% lithium oxide and/or potassium oxide.
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Specification