Fining agents for silicate glasses
AssigneeCorning Incorporated
InventorsMatthew John Dejneka, Sinue Gomez
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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.
Claims8
A silicate glass, the silicate glass having a seed concentration of less than about 1 seed/cm3, wherein the silicate glass comprises:
- 60-72 mol % SiO2;
- 6-14 mol % Al2O3;
- 0-15 mol % B2O3;
- 0-1 mol % Li2O;
- 0-20 mol % Na2O;
- 0-10 mol % K2O;
- 0-8 mol % MgO;
- 0-10 mol % CaO;
- 0-5 mol % ZrO2;
- 0-1 mol % SnO2;
- 0-1 mol % CeO2;
- less than 50 ppm As2O3;
- and less than 50 ppm Sb2O3;
- wherein 12 mol %≦Li2O+Na2O+K2O≦20 mol % and 0 mol %≦MgO+CaO≦10 mol %, wherein the silicate glass is formed from a batch or raw materials that includes at least one fining agent, wherein the fining agent comprises at least one inorganic compound and is substantially free of antimony and arsenic.
Dependencies are inferred from the claim text.