Abstract: A lining material for glass melting furnaces comprises platinum or platinum alloy as a base material containing osmium as an impurity in an amount no more than 20 ppm. The lining material is used for that part of the melting furnace which comes into contact with molten glass. The low osmium content prevents the formation of bubbles in molten glass, thereby providing high-quality glass products.

Abstract: The invention pertains to a stirrer apparatus for glass melts. A stirring element and a stirrer shaft are provided, each comprised of a metal or a metal alloy having a high melting point temperature. A drive shaft for the stirring element comprises a different metallic material, for example an ODS alloy on the basis of iron or nickel. The junction between the stirrer shaft and the drive shaft is located approximately in the region in which the level of the surface of the glass melt is located during use. The end portion of the drive shaft or the end portion of the stirrer shaft, which can be covered by the melt during use, are isolated by a platinum casing.

Abstract: Spinner discs for use in the fiberization of glass in rotary fiberization processes are made of intermetallic compounds of aluminides of nickel (Ni3Al and NiAl).

Abstract: A process for producing a glass substrate for an information recording medium comprising: (a) providing a chemical reinforcement tank comprising a chemical reinforcement liquid contained therein, and a holding means for holding a glass substrate; and (b) chemically strengthening the glass substrate by immersing the glass substrate in the chemical reinforcement liquid, wherein ions are exchanged on the surface of the glass substrate with ions in the chemical reinforcement liquid having a diameter larger than that in the glass substrate; wherein at least one of a wall surface of the chemical reinforcement tank and the holding means is made from a stainless alloy which exhibits corrosion resistance in a high temperature region of the chemical reinforcement liquid, the stainless alloy being made from a martensitic stainless alloy or an austenitic stainless alloy. Such process prevents the adhesion of particles, such as fine iron particles onto the glass substrate.

Abstract: A glassware forming mold that includes a body of heat conductive construction having a central portion with a forming surface for shaping molten glass and a peripheral portion spaced radially outwardly of the central portion. A plurality of coolant passages extend in a spaced array through the peripheral portion of the mold body, and liquid coolant is directed through such passages for extracting heat from the body by conduction from the forming surface. A plurality of openings extend axially into the body radially between at least some of the liquid coolant passages and the forming surface for retarding heat transfer from the forming surface to liquid coolant in the passages.

Abstract: A lining material for glass melting furnaces comprises platinum or platinum alloy as a base material containing osmium as an impurity in an amount no more than 20 ppm. The lining material is used for that part of the melting furnace which comes into contact with molten glass. The low osmium content prevents the formation of bubbles in molten glass, thereby providing high-quality glass products.

Abstract: The invention pertains to a stirrer apparatus for glass melts. A stirring element and a stirrer shaft are provided, each comprised of a metal or a metal alloy having a high melting point temperature. A drive shaft for the stirring element comprises a different metallic material, for example an ODS alloy on the basis of iron or nickel. The junction between the stirrer shaft and the drive shaft is located approximately in the region in which the level of the surface of the glass melt is located during use. The end portion of the drive shaft or the end portion of the stirrer shaft, which can be covered by the melt during use, are isolated by a platinum casing.

Abstract: In a glass melter, a precious metal insert is used to protect a gas bubbler from corrosion at the orifice of the bubbler through which gas is injected into the melt. The use of a precious refractory metal insert at the bubbler orifice prevents the attack of molten glass on the bubbler. The precious metal is chosen from the refractory group of metals and the platinum group of metals. Preferably the precious metal from the platinum group is platinum or one of its alloys or one of ruthenium, rhodium, palladium, osmium and iridium. The precious metal from the refractory group is preferably chromium.

Abstract: A method of manufacturing a 2-5 inch diameter glass substrate for a magnetic disc in which a plate glass is press molded using a mold formed of a super-hard material and having a surface of a prescribed roughness. Ion implantation using nitrogen ions is performed on the surface of the mold, after which ion implantation using palladium ions, platinum ions, and carbon ions is performed in the order given. Finally, the surface of the mold is coated with a graphite or amorphous diamond-like carbon coating.

Abstract: A method of manufacturing a 1-inch diameter glass substrate for a magnetic disc in which a plate glass is press molded using a mold formed of a super-hard material and having a surface of a prescribed roughness. Ion implantation using nitrogen ions is performed on the surface of the mold, after which ion implantation using palladium ions, platinum ions, and carbon ions is performed in the order given. Finally, the surface of the mold is coated with a graphite or amorphous diamond-like carbon coating.

Abstract: To provide a press mold for molding glass that is relatively less expansible than a mold material. The mold is configured so that the content volume of the mold is approximately equal to the volume of molded glass at the time of press molding, and a side face member of the mold is divided into a plurality of pieces so as to be capable of moving toward an outside but incapable of moving toward an inside. Thereby, over-tightening of mold side face can be prevented effectively, and a satisfactory molding operation can be performed by transmitting a molding pressure uniformly to a molded member without opening any mold side face.

Abstract: The invention relates to a contact member or covering (1) for covering structures (4,9) that come into contact with glass objects (12) during their forming process. The covering is a relatively compact non-woven fiber web (2) with apertures (10) and comprised of randomly oriented fibers which are composed, for example, of stainless steel. This covering can, for example, be used to cover tempering and pressure rings which are used in the process of forming glass plates.

Abstract: The present invention provides an improvement to a fiber optic draw furnace having a heating element (22) arranged inside a furnace shell (20) for drawing an optical fiber (F) from a preform (P). The fiber optic draw furnace (10) has one or more pieces of fiber draw furnace insulation (14, 16, 18) to separate the heating element (22) from the furnace shell (20) for reducing the thermal transfer therebetween. At least one of the pieces of fiber draw furnace insulation (14, 16, 18) is made from rigidified high purity graphite felt that provides highly efficient thermal insulation between the heating element (22) and the outer furnace shell (20). The rigidified high purity graphite felt insulation (14), (16, 18) includes either a bottom insulation ring (14), a cylindrical insulation insert (16) or a cylindrical insulation canister (18).

Abstract: A lining material for glass melting furnaces comprises platinum or platinum alloy as a base material containing osmium as an impurity in an amount no more than 20 ppm. The lining material is used for that part of the melting furnace which comes into contact with molten glass. The low osmium content prevents the formation of bubbles in molten glass, thereby providing high-quality glass products.

Abstract: Process and apparatus are disclosed for delivering molten thermoplastic material from one chamber to another through a throat in a refractory wall separating said chambers. A refractory metal conduit is positioned within said refractory throat below the level of the floor of said chambers, and standpipes at each end of said conduit extending above the level of said floors, create stagnant thermoplastic material about the conduit so as to prevent corrosion products from flowing away from about the conduit and thereby also preventing fresh thermoplastic from replacing it. The stagnant material becomes enriched with corrosion products, which with the absence of flow retards further corrosion of the refractory about the conduit.

Abstract: The invention relates to a method of manufacturing a bushing baseplate, and to a bushing baseplate. The bushing baseplate is characterized in that it comprises tips (18) constituted by hollow tubular elements of outside diameter slightly smaller than the inside diameter of holes (16) in the plate (12) forming the bushing baseplate, which tips are subjected to a step of being expanded radially relative to their axes. The method is simpler and less expensive.