Fining agents for silicate glasses
First Claim
1. A method of making a silicate glass having a seed concentration of less than about 1 seed/cm3, wherein the method comprises:
- melting at a first temperature a glass batch comprising 60-70 mol % SiO2;
6-14 mol % Al2O3;
0-3 mol % B2O3;
0-1 mol % Li2O;
8-18 mol % Na2O;
0-5 mol % K2O;
0-2.5 mol % CaO;
above 0 to 3 mol % ZrO2; and
a fining agent, wherein 12 mol %≤
Li2O +Na2O+K2O≤
20 mol %, and wherein the glass batch comprises less than 50 ppm As2O3; and
heating at a second temperature greater than the first temperature for a time sufficient to produce the silicate glass having a seed concentration of less than about 1 seed/cm3,wherein the fining agent is selected from the group consisting of SnO2, CeO2, and combinations thereof, and the fining agent comprises from 0-1 mol % SnO2 and 0-1 mol % CeO2 of the glass batch.
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Abstract
A fining agent for reducing the concentration of seeds or bubbles in a silicate glass. The fining agent includes at least one inorganic compound, such as a hydrate or a hydroxide that acts as a source of water. In one embodiment, the fining agent further includes at least one multivalent metal oxide and, optionally, an oxidizer. A fusion formable and ion exchangeable silicate glass having a seed concentration of less than about 1 seed/cm3 is also provided. Methods of reducing the seed concentration of a silicate glass, and a method of making a silicate glass having a seed concentration of less than about 1 seed/cm3 are also described.
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Citations
30 Claims
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1. A method of making a silicate glass having a seed concentration of less than about 1 seed/cm3, wherein the method comprises:
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melting at a first temperature a glass batch comprising 60-70 mol % SiO2;
6-14 mol % Al2O3;
0-3 mol % B2O3;
0-1 mol % Li2O;
8-18 mol % Na2O;
0-5 mol % K2O;
0-2.5 mol % CaO;
above 0 to 3 mol % ZrO2; and
a fining agent, wherein 12 mol %≤
Li2O +Na2O+K2O≤
20 mol %, and wherein the glass batch comprises less than 50 ppm As2O3; andheating at a second temperature greater than the first temperature for a time sufficient to produce the silicate glass having a seed concentration of less than about 1 seed/cm3, wherein the fining agent is selected from the group consisting of SnO2, CeO2, and combinations thereof, and the fining agent comprises from 0-1 mol % SnO2 and 0-1 mol % CeO2 of the glass batch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of making a silicate glass having a seed concentration of less than about 1 seed/cm3, wherein the method comprises:
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melting at a first temperature a glass batch comprising 60-70 mol % SiO2;
0-3 mol % B2O3;
0-1 mol % Li2O;
8-18 mol % Na2O;
0-5 mol % K2O;
0-2.5 mol % CaO;
above 0 to 3% mol ZrO2; and
a fining agent, wherein 12 mol %<
Li2O+Na2O+K2O≤
20 mol %, and wherein the glass batch is substantially free of As2O3; andheating at a second temperature greater than the first temperature for a time sufficient to produce the silicate glass having a seed concentration of less than about 1 seed/cm3, wherein the fining agent is selected from the group consisting of SnO2, CeO2, and combinations thereof, and the fining agent comprises 0-1 mol % SnO2 and 0-1 mol % CeO2 of the glass batch. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of making a silicate glass having a seed concentration of less than about 1 seed/cm3, wherein the method comprises:
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melting at a first temperature a glass batch comprising 60-70 mol % SiO2;
6-14 mol % Al2O3;
0-15 mol % B2O3;
0-1 mol % Li2O;
0-20 mol % Na2O;
0-10 mol % K2O;
0-10 mol % CaO;
0-5 mol % ZrO2;
wherein 12 mol %≤
Li2O+Na2O+K2O≤
20 mol %, wherein the glass batch comprises less than 50 ppm As2O3, wherein the glass batch comprises a fining agent comprising a multivalent metal oxide, an oxidizer, and at least one inorganic compound that acts as of a source of water at a temperature where a melt is formed; andheating at a second temperature greater than the first temperature for a time sufficient to produce the silicate glass having a seed concentration of less than about 1 seed/cm3. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification