An alkali-free glass substrate contains, as represented by mass % based on oxides: 54% to 68% of SiO.sub.2; 10% to 25% of Al.sub.2O.sub.3; 0.1% to 5.5% of B.sub.2O.sub.3; and 8% to 26% of MgO+CaO+SrO+BaO. The alkali-free glass substrate has β-OH of 0.15 mm.sup.−1 to 0.35 mm.sup.−1, and a Cl content of 0.15 to 0.3 mass %. A bubble growth index I of the alkali-free glass substrate given by the following formula is 320 or more: I=590.5×[β-OH]+874.1×[Cl]−5.7×[B.sub.2O.sub.3]−33.3. In the formula, [β-OH] is β-OH of the alkali-free glass substrate in mm.sup.−1, [Cl] is the Cl content of the alkali-free glass substrate in mass %, and [B.sub.2O.sub.3] is a B.sub.2O.sub.3 content of the alkali-free glass substrate in mass %.

A method of making glass having a basic soda-lime-silica glass portion, and a colorant portion, the colorant portion including total iron as Fe.sub.2O.sub.3 in the range of at least 0.00 to no more than 0.02 weight percent, a redox ratio in the range of 0.35 to 0.6, and tin metal providing tin in an amount within the range of greater than 0.005 to 5.0 weight percent; the glass product has a tin side and an opposite air side, said tin side of the glass having a higher concentration of tin than the air side, the air side having a uniform concentration of tin from the air side of the glass product towards the tin side of the glass product.

A method of making glass having a basic soda-lime-silica glass portion, and a colorant portion, the colorant portion including total iron as Fe.sub.2O.sub.3 in the range of at least 0.00 to no more than 0.02 weight percent, a redox ratio in the range of 0.35 to 0.6, and tin metal providing tin in an amount within the range of greater than 0.005 to 5.0 weight percent; the glass product has a tin side and an opposite air side, said tin side of the glass having a higher concentration of tin than the air side, the air side having a uniform concentration of tin from the air side of the glass product towards the tin side of the glass product.

A process and an apparatus for refining molten glass. The apparatus includes a porous body having an inlet, an outlet, and a plurality of pores through which molten glass can flow between the inlet and the outlet. The plurality of pores are defined by walls having wall surfaces that are configured to interact with the molten glass as the molten glass flows between the inlet and the outlet to help refine the molten glass.

An apparatus for manufacturing glass includes a furnace. A doghouse of the furnace receives and melts solid-glass forming material using one or more submerged combustion burners. An elongated tank positioned downstream of the doghouse includes a melting chamber, a refining chamber, and a thermal conditioning. The melting chamber has in inlet through which molten glass is received from the doghouse. The refining chamber is positioned downstream of the melting chamber and receives molten glass from the melting chamber. The thermal conditioning chamber is positioned downstream of the refining chamber and receives molten glass from the refining chamber. Additionally, the thermal conditioning chamber delivers molten glass to a glass forming machine.

A glass fining system, glass fining device, and method are disclosed. The glass fining device in accordance with one aspect of the disclosure includes at least one heated orifice through which molten glass flows from a glass melter to produce at least one superheated glass stream; and a low-pressure chamber disposed downstream from the heated orifice, where the at least one superheated glass stream flows from the at least one heated orifice and into the low-pressure chamber, and where the low-pressure chamber surrounds the at least one superheated glass stream. In some embodiments, the low-pressure chamber may include at least one surface extender.

A glass refining system, glass refining device, and method are disclosed. The apparatus in accordance with one aspect of the disclosure includes an objective having a laterally outer extremity, where a molten metal stream flows from an opening in the objective and over the objective, and separates from the objective at a molten metal separation location that is inboard of the extremity; and a molten metal receptacle disposed below the objective and configured to receive the molten metal stream, wherein a molten glass stream flows downwardly toward the objective and over the molten metal stream, and wherein the molten glass stream separates from the molten metal stream at a molten glass separation location that is laterally outboard of the molten metal separation location and flows into a molten glass receptacle.

An additive manufacturing ink composition may include a fluid medium. The ink may further include a chalcogenide glass suspended within the fluid medium to form a chalcogenide glass mixture. The ink may also include a surfactant. A method for forming an additive manufacturing ink may include wet milling a chalcogenide glass in a fluid medium and a surfactant to produce a chalcogenide glass mixture. The method may also include, after wet milling the chalcogenide glass, processing the chalcogenide glass mixture to reduce an average particle size of the chalcogenide glass.

A device formation method may include printing a chalcogenide glass ink onto a surface to form a chalcogenide glass layer, where the chalcogenide glass ink comprises chalcogenide glass and a fluid medium. The method may further include sintering the chalcogenide glass layer at a first temperature for a first duration. The method may also include annealing the chalcogenide glass layer at a second temperature for a second duration. A device may include a substrate and a printed chalcogenide glass layer on the substrate, where the printed chalcogenide glass layer includes annealed chalcogenide glass, and where the printed chalcogenide glass layer is free from cracks.

A device formation method may include printing a chalcogenide glass ink onto a surface to form a chalcogenide glass layer, where the chalcogenide glass ink comprises chalcogenide glass and a fluid medium. The method may further include sintering the chalcogenide glass layer at a first temperature for a first duration. The method may also include annealing the chalcogenide glass layer at a second temperature for a second duration. A device may include a substrate and a printed chalcogenide glass layer on the substrate, where the printed chalcogenide glass layer includes annealed chalcogenide glass, and where the printed chalcogenide glass layer is free from cracks.