초록 ▼

A low infrared absorbing lithium glass includes FeO in the range of 0.0005-0.015 wt. %, more preferably 0.001-0.010 wt. %, and a redox ratio in the range of 0.005-0.15, more preferably in the range of 0.005-0.10. The glass can be chemically tempered and used to provide a ballistic viewing cover for

A low infrared absorbing lithium glass includes FeO in the range of 0.0005-0.015 wt. %, more preferably 0.001-0.010 wt. %, and a redox ratio in the range of 0.005-0.15, more preferably in the range of 0.005-0.10. The glass can be chemically tempered and used to provide a ballistic viewing cover for night vision goggles or scope. A method is provided to change a glass making process from making a high infrared absorbing lithium glass having FeO in the range of 0.02 to 0.04 wt. % and a redox ratio in the range of 0.2 to 0.4 to the low infrared absorbing lithium glass by adding additional oxidizers to the batch materials. A second method is provided to change a glass making process from making a low infrared absorbing lithium glass to the high infrared absorbing lithium glass by adding additional reducers to the batch material. In one embodiment of the invention the oxidizer is CeO2. An embodiment of the invention covers a glass made according to the method.

대표청구항 ▼

1. A glass composition consisting essentially of: ComponentRangeSiO260-63 wt %Na2O10-12wt %Li2O4-5.5wt %Al2O317-19wt %ZrO22-5wt %(Al2O3 + ZrO2)21.5-24wt %FeO0.0005-0.015wt %Fe2O3 (total iron)50-less than 800 ppm;and an oxidizer selected from the group of cerium oxide in the range of greater than 0 t

1. A glass composition consisting essentially of: ComponentRangeSiO260-63 wt %Na2O10-12wt %Li2O4-5.5wt %Al2O317-19wt %ZrO22-5wt %(Al2O3 + ZrO2)21.5-24wt %FeO0.0005-0.015wt %Fe2O3 (total iron)50-less than 800 ppm;and an oxidizer selected from the group of cerium oxide in the range of greater than 0 to 0.50 wt. % and/or manganese oxide in the range of greater than 0 to 0.75 wt. %, and a redox ratio in the range of 0.005-0.15, wherein the glass within the ultraviolet (“UV”) wavelength range of 295-395 nm has a transmission in the range of 50-85%; within a visible (“LTC/2°”) wavelength range of 395-775 nm has a transmission in the range of range of 89-92%;within an infrared (“IR”) wavelength range of 775-2125 nm has a transmission in the range of range of 80-92%; and within a total solar energy transmittance (“TSET”) wavelength range of 275-2125 nm has a transmission in the range of 82-92%, wherein the glass has a thickness of 0.223 inch (5.7 millimeters). 2. The glass composition according to claim 1, wherein cerium oxide is in the range of 0.01 to 0.15 wt. %. 3. The glass composition according to claim 1, wherein the FeO is selected from one of the ranges of 0.0005 to 0.015 wt. % and 0.001 to 0.010 wt. %, the Fe2O3 (total iron) is selected from one of the ranges of 0.005 to 0.06 wt. % and 0.005 to 0.03 wt. %, and the redox ratio is selected from one of the ranges of 0.005 to 0.15 wt. % and 0.005 to 0.10 wt. %. 4. A glass composition consisting essentially of: ComponentRangeSiO260-63wt. %Na2O10-12wt. %Li2O4-5.5wt. %Al2O317-19wt. %ZrO23.5-5wt. %(Al2O3 + ZrO2)21.5-24wt. %FeO0.0005-0.015wt. %Fe2O3 (total iron)800-1200ppm;and a redox ratio in the range of 0.006-0.13; and an oxidizer selected from the group of cerium oxide in the range of greater than 0 to 0.50 wt. % and/or manganese oxide in the range of greater than 0 to 0.75 wt. %, wherein glass within the ultraviolet (“UV”) wavelength range of 295-395 nm has a transmission in the range of 67-74%; the glass within a visible (“LTC/2°”) wavelength range of 395-775 nm has a transmission in the range of 88-90%: the glass within an infrared (“IR”) wavelength range of 775-2125 nm has a transmission in the range of 70-79%; and the glass within a total solar energy transmittance (“TSET”) wavelength range of 275-2125 nm has a transmission in the range of 78-84%, wherein the glass given above have a thickness of 0.223 inch (5.7 millimeters). 5. The glass composition according to claim 4, wherein the FeO is selected from one of the ranges of 0.002 to 0.015 wt. %; 0.002 to 0.001 wt. %; 0.0035 to 0.001 wt. % and 0.003 to 0.0038 wt. %, the Fe2O3 (total iron) is selected from one of the ranges of 0.08 to 0.12 wt. % and 0.09 to 0.10 wt. %, and the redox ratio is selected from one of the range of 0.01 to 0.13 and 0.015 to 0.10. 6. The glass composition according to claim 4, wherein the FeO is in the range of 0.002-0.012 wt. %; the total iron is in the range of 0.08-0.12 wt. %; the redox ratio is in the range of 0.02 to 0.10. 7. A device for viewing radiated infrared energy, the device comprising a housing having at least one passageway, the passageway having a first open end and a second open end, a lens system for viewing radiated infrared energy, the improvement comprising: a chemically tempered ballistic glass lens mounted adjacent to one end of the passageway, the ballistic glass lens comprising a first surface, an opposite second surface and a glass segment between the first and the second surfaces of the ballistic glass lens, the glass segment consisting essentially of: ComponentRangeSiO260-63wt. %Na2O10-12wt. %Li2O4-5.5wt. %Al2O317-19wt. %ZrO23.5-5wt. %(Al2O3 + ZrO2)21.5-24wt. %FeO0.0005-0.015wt. %Fe2O3 (total iron)50-less than 800ppm;and an oxidizer selected from the group of cerium oxide in the range of greater than 0 to 0.50 wt. % and/or manganese oxide in the range of greater than 0 to 0.75 wt. %, and a redox ratio in the range of 0.005-0.15, wherein the lens has a visible transmission of greater than 88%, an infrared transmission of greater than 80%, and an infrared viewing transmission of greater than 80%, the transmissions are for a glass lens having a thickness 0.223 inch (5.7 millimeter). 8. The device according to claim 7, wherein the FeO of the glass segment is in the range of 0.001-0.010 wt. %. 9. The device according to claim 8, wherein the redox ratio of the glass segment is in the range of 0.005 to 0.10. 10. A glass composition consisting essentially of: ComponentRangeSiO260-63 wt %Na2O10-12wt %Li2O4-5.5wt %Al2O317-19wt %ZrO22-5wt %(Al2O3 + ZrO2)21.5-24wt %FeO0.02-0.05wt %Fe2O3 (total iron)800-1200 ppmand a redox ratio of 0.20-0.40, wherein the glass within the ultraviolet (“UV”) wavelength range of 295-395 nm has a transmission in the range of 50-85%; the glass within a visible (“LTC/2°”) wavelength range of 395-775 nm has a transmission in the range of 89-92%: the glass within an infrared (IR) wavelength range of 775-2125 nm has a transmission in the range of 80-90%; and the glass within a total solar energy transmittance (“TSET”) wavelength range of 275-2125 nm has a transmission in the range of 82-92%, wherein the glass given above have a thickness of 0.223 inch (5.7 millimeters). 11. The glass composition according to claim 10, wherein the FeO is in the range of 0.020-0.035 wt. %; the total iron is in the range of 0.05-0.12 wt %; and a redox ratio in the range of 0.2 to 0.35. 12. The glass composition according to claim 10, wherein the FeO is selected from one of the ranges of 0.02 to 0.035 wt. %; 0.035 to 0.4 wt. %; and 0.03 to 0.038 wt. %, and the Fe2O3 (total iron) is selected from one of the ranges of 0.05 to 0.12 wt. % and 0.06 to 0.10 wt. %, and the redox ratio is 0.20 to 0.35. 13. A laminated transparency comprising a plurality of chemically strengthened glass sheets and optionally plastic sheets laminated together by plastic interlayers, wherein at least one of the glass sheets has a glass composition consisting essentially of: ComponentRangeSiO260-63wt. %Na2O10-12wt. %Li2O4-5.5wt. %Al2O317-19wt. %ZrO23.5-5wt. %(Al2O3 + ZrO2)21.5-24wt. %and a selection from one of Group A and B, Group A consisting essentially of: FeO0.0005-0.015wt. %Fe2O3 (total iron)50-less than 800ppmand an oxidizer consisting essentially of cerium oxide in the range of greater than 0 to 0.50 wt. % and/or manganese oxide in the range of greater than 0 to 0.75 wt. %, and a redox ratio in the range of 0.0005-0.15, such that the glass within the ultraviolet (“UV”) wavelength range of 295-395 nm has a transmission in the range of 50-85%; within a visible (“LTC/2°”) wavelength range of 395-775 nm has a transmission in the range of range of 89-92%; within an infrared (“IR”) wavelength range of 775-2125 nm has a transmission in the range of range of 80-92%; and within a total solar energy transmittance (“TSET”) wavelength range of 275-2125 nm has a transmission in the range of 82-92%, wherein the glass has a thickness of 0.223 inch (5.7 millimeters); and Group B consisting essentially of: FeO0.02-0.05wt. %Fe2O3 (total iron)800-1200ppm;a redox ratio0.20-0.40such that the glass within the ultraviolet (“UV”) wavelength range of 295-395 nm has a transmission in the range of 50-85%; the glass within a visible (“LTC/2°”) wavelength range of 395-775 nm has a transmission in the range of 89-92%: the glass within an infrared (IR) wavelength range of 775-2125 nm has a transmission in the range of 80-90%; and the glass within a total solar energy transmittance (“TSET”) wavelength range of 275-2125 nm has a transmission in the range of 82-92%, wherein the glass given above has a thickness of 0.223 inch (5.7 millimeters). 14. The laminated transparency according to claim 13, wherein the laminated transparency is selected from the group of aircraft windows, and land, air, space, on the water, and below the water vehicle windows. 15. The laminated transparency according to claim 14, wherein the window is a windshield.