Abstract: Methods for reducing the oxygen concentration in an enclosure including a platinum-containing vessel through which molten glass is flowing are disclosed. The methods include injecting hydrogen gas into an oxygen-containing atmosphere flowing between the enclosure and a reaction chamber. The atmosphere is heated with a heating element in the reaction chamber, whereupon oxygen in the oxygen-containing atmosphere reacts with the hydrogen. In other embodiments, the hydrogen gas and oxygen-containing atmosphere can be exposed to a catalyst comprising platinum positioned in the reaction chamber.

Abstract: According to one embodiment, a glass may include from about 50 mol. % to about 70 mol. % SiO2; from about 12 mol. % to about 35 mol. % B2O3; from about 4 mol. % to about 12 mol. % Al2O3; greater than 0 mol. % and less than or equal to 1 mol. % alkali metal oxide, wherein Li2O is greater than or equal to about 20% of the alkali metal oxide; from about 0.3 mol. % to about 0.7 mol. % of Na2O or Li2O; and greater than 0 mol. % and less than 12 mol. % of total divalent oxide, wherein the total divalent oxide includes at least one of CaO, MgO and SrO, and wherein a ratio of Li2O (mol. %) to (Li2O (mol. %)+(Na2O (mol. %)) is greater than or equal 0.4 and less than or equal to 0.6. The glass may have a relatively low high temperature resistivity and a relatively high low temperature resistivity.

Abstract: A method of reducing bubble lifetime on the free surface of a volume of molten glass contained within or flowing through a vessel including a free volume above the free surface, thereby, minimizing re-entrainment of the bubbles back into the volume of molten glass and reducing the occurrence of blisters in finished glass products.

Abstract: In embodiments, a melter for melting glass may include an inlet wall, an outlet wall opposite the inlet wall, and sidewalls extending from the inlet wall to the outlet wall. The inlet wall, outlet wall, and sidewalls define a glass melting space enclosed by a floor and a top. In embodiments, the inlet wall may comprise a glass contact wall comprising a glass contact surface facing the glass melting space. A superstructure of the inlet wall comprises a jack arch positioned over the glass contact wall and at least a portion of the glass melting space. A plane of an interior face of the jack arch and a plane of the glass contact surface are off-set in a horizontal direction. A vertical distance from the floor to an underside of the jack arch is less than a vertical distance from the floor to an underside of the top.

Abstract: Methods are disclosed for shrinking bubbles on the free surface of a volume of molten glass contained within or flowing through a vessel, thereby minimizing re-entrainment of the bubbles into the volume of molten glass and reducing the occurrence of bubbles in finished glass products produced from the molten glass. Methods of identifying a source location for the bubbles is also described.

Abstract: A method for reconditioning a glass manufacturing system includes establishing a reducing atmosphere in a glass melting vessel and draining a glass melt composition from the melting vessel while the reducing atmosphere is in the vessel. The pressure of the reducing atmosphere is greater than the pressure of the atmosphere surrounding the melting vessel and the reducing atmosphere is established by operating at least one combustion burner in the melting vessel in a fuel-rich condition.

Abstract: Methods for making a glass article are described that include flowing molten glass through a metallic vessel, and supplying alternating electrical currents to multiple electrical circuits, each electrical circuit including a power supply, a pair of adjacent electrical flanges connected to the power supply, and a portion of the metallic vessel extending between and in electrical communication with the pair of adjacent flanges. At least two adjacent electrical circuits of the multiple electrical circuits share an electrical flange that is a common electrical path for the two adjacent electrical circuits, the two adjacent electrical circuits being supplied with alternating electrical currents, wherein at least one of the electrical currents is cut by a phase-fired controller.

Abstract: Methods for reducing the oxygen concentration in an enclosure including a platinum-containing vessel through which molten glass is flowing are disclosed. The methods include injecting hydrogen gas into an oxygen-containing atmosphere flowing between the enclosure and a reaction chamber. The atmosphere is heated with a heating element in the reaction chamber, whereupon oxygen in the oxygen-containing atmosphere reacts with the hydrogen. In other embodiments, the hydrogen gas and oxygen-containing atmosphere can be exposed to a catalyst comprising platinum positioned in the reaction chamber.

Abstract: A glass melt delivery system vessel has at least one sidewall and floor made of a refractory material, such as zirconia, and at least one electrode extending through the refractory material. The at least one electrode is configured to heat a glass melt in contact with the refractory material at an average temperature of at least about 1600 C° without exceeding a breakdown condition of the refractory material in contact with the glass melt.

Abstract: A method of reducing bubble lifetime on the free surface of a volume of molten glass contained within or flowing through a vessel including a free volume above the free surface, thereby minimizing re-entrainment of the bubbles back into the volume of molten glass and reducing the occurrence of blisters in finished glass products.

Abstract: A method for forming a laminated glass article may include flowing a molten first glass composition having a first R2O concentration and a first fining agent with a first fining agent concentration. The method may also include flowing a molten second glass composition having a second R2O concentration less than the first R2O concentration of the first glass composition and a second fining agent with a second fining agent concentration that is greater than or equal to the first fining agent concentration of the first glass composition. The molten first glass composition may be contacted with the molten second glass composition to form an interface between the molten first glass composition and the molten second glass composition.

Abstract: A method for forming a laminated glass article may include flowing a molten first glass composition having a first R2O concentration and a first fining agent with a first fining agent concentration. The method may also include flowing a molten second glass composition having a second R2O concentration less than the first R2O concentration of the first glass composition and a second fining agent with a second fining agent concentration that is greater than or equal to the first fining agent concentration of the first glass composition. The molten first glass composition may be contacted with the molten second glass composition to form an interface between the molten first glass composition and the molten second glass composition.

Abstract: A method for reconditioning a glass manufacturing system includes establishing a reducing atmosphere in a glass melting vessel and draining a glass melt composition from the melting vessel while the reducing atmosphere is in the vessel. The pressure of the reducing atmosphere is greater than the pressure of the atmosphere surrounding the melting vessel and the reducing atmosphere is established by operating at least one combustion burner in the melting vessel in a fuel-rich condition.

Abstract: In embodiments, a melter for melting glass may include an inlet wall, an outlet wall opposite the inlet wall, and sidewalls extending from the inlet wall to the outlet wall. The inlet wall, outlet wall, and sidewalls define a glass melting space enclosed by a floor and a top. In embodiments, the inlet wall may comprise a glass contact wall comprising a glass contact surface facing the glass melting space. A superstructure of the inlet wall comprises a jack arch positioned over the glass contact wall and at least a portion of the glass melting space. A plane of an interior face of the jack arch and a plane of the glass contact surface are off-set in a horizontal direction. A vertical distance from the floor to an underside of the jack arch is less than a vertical distance from the floor to an underside of the top.

Abstract: According to one embodiment, a glass may include from about 50 mol. % to about 70 mol. % SiO2; from about 12 mol. % to about 35 mol. % B2O3; from about 4 mol. % to about 12 mol. % Al2O3; greater than 0 mol. % and less than or equal to 1 mol. % alkali metal oxide, wherein Li2O is greater than or equal to about 20% of the alkali metal oxide; from about 0.3 mol. % to about 0.7 mol. % of Na2O or Li2O; and greater than 0 mol. % and less than 12 mol. % of total divalent oxide, wherein the total divalent oxide includes at least one of CaO, MgO and SrO, and wherein a ratio of Li2O (mol. %) to (Li2O (mol. %)+(Na2O (mol. %)) is greater than or equal 0.4 and less than or equal to 0.6. The glass may have a relatively low high temperature resistivity and a relatively high low temperature resistivity.

Abstract: A glass melt delivery system vessel has at least one sidewall and floor made of a refractory material, such as zirconia, and at least one electrode extending through the refractory material. The at least one electrode is configured to heat a glass melt in contact with the refractory material at an average temperature of at least about 1600 C° without exceeding a breakdown condition of the refractory material in contact with the glass melt.

Abstract: According to one embodiment, a glass may include from about 50 mol. % to about 70 mol. % SiO2; from about 12 mol. % to about 35 mol. % B2O3; from about 4 mol. % to about 12 mol. % Al2O3; greater than 0 mol. % and less than or equal to 1 mol. % alkali metal oxide, wherein Li2O is greater than or equal to about 20% of the alkali metal oxide; from about 0.3 mol. % to about 0.7 mol. % of Na2O or Li2O; and greater than 0 mol. % and less than 12 mol. % of total divalent oxide, wherein the total divalent oxide includes at least one of CaO, MgO and SrO, and wherein a ratio of Li2O (mol. %) to (Li2O (mol. %)+(Na2O (mol. %)) is greater than or equal 0.4 and less than or equal to 0.6. The glass may have a relatively low high temperature resistivity and a relatively high low temperature resistivity.

Abstract: According to embodiments disclosed herein, light-scattering laminated glass articles may include a first glass layer, a second glass layer, and a light-scattering component. The first glass layer may be formed from a first glass composition. The second glass layer may be formed from a second glass composition and fused to the first glass layer. The light-scattering component may be disposed at an interface of the first glass layer and the second glass layer. The light-scattering component may include a different composition or material phase than the first glass layer and the second glass layer. Also disclosed herein are methods for producing light-scattering laminated glass articles.

Abstract: A method for forming a laminated glass article may include flowing a molten first glass composition having a first R2O concentration and a first fining agent with a first fining agent concentration. The method may also include flowing a molten second glass composition having a second R2O concentration less than the first R2O concentration of the first glass composition and a second fining agent with a second fining agent concentration that is greater than or equal to the first fining agent concentration of the first glass composition. The molten first glass composition may be contacted with the molten second glass composition to form an interface between the molten first glass composition and the molten second glass composition.

Abstract: According to one embodiment, a glass may include from about 50 mol. % to about 70 mol. % SiO2; from about 12 mol. % to about 35 mol. % B2O3; from about 4 mol. % to about 12 mol. % Al2O3; greater than 0 mol. % and less than or equal to 1 mol. % alkali metal oxide, wherein Li2O is greater than or equal to about 20% of the alkali metal oxide; from about 0.3 mol. % to about 0.7 mol. % of Na2O or Li2O; and greater than 0 mol. % and less than 12 mol. % of total divalent oxide, wherein the total divalent oxide includes at least one of CaO, MgO and SrO, and wherein a ratio of Li2O (mol. %) to (Li2O (mol. %) +(Na2O (mol. %)) is greater than or equal 0.4 and less than or equal to 0.6. The glass may have a relatively low high temperature resistivity and a relatively high low temperature resistivity.