Abstract: To provide a material for use at high temperatures of several 100° C. which is simple and quick to produce, the invention provides a composite having a layer structure and a process for producing it, which comprises the following steps: a) provision of at least two plates which each have at least one main area of extension, b) stacking of the plates in such a way that a main area of extension of one plate is essentially opposite a main area of extension of the subsequent plate in the stack, c) joining of the stacked plates to form a block using a sinterable composition, d) carrying out a heat treatment on the block so that at least sintering of the sinterable composition occurs and a strong composite body is formed from the block.

Abstract: A process is disclosed for simple and rapid production of a shaped body comprising fused silica and a shaped body which leads to virtually no contamination of a melt in contact with the shaped body even at high temperatures. The disclosed process comprises the steps of: a) provision of fused silica in the form of essentially amorphous SiO2 grains of which not more than 5% have a diameter greater than 15 mm, b) addition of water to the fused silica grains to produce a slip, c) casting of the slip into a mold which comprises a hollow body having the inverse shape of the shaped body to be produced, and d) drying of the slip to give an intermediate body, which is then sintered and cooled. A shaped body producible in accordance with the aforementioned process is also disclosed, which comprises at least 99.0 mol % of SiO2.

Abstract: The method provides an improved quartz glass body, especially an improved quartz glass crucible for melting non-metals, non-ferrous metals, or silicon. The quartz glass body is made by a method in which a quartz glass-water mixture is supplied to a gypsum casting mold comprising an outer part and an inner part, dried in the gypsum mold, and put under an overpressure via a system of ducts in the form of textile tubes embedded in the mold during the drying. Later a resulting green glass body is removed from the mold. At least a portion of the shaping surfaces of the inner part of the gypsum mold are surfaces of a water-impermeable substance. The method provides a cast body with a reduced tendency to crack and with a smaller open porosity.

Abstract: A method for producing permanent integral connections of oxide-dispersed metallic materials by welding. The materials or components to be connected are overlapped to form an overlapping region in a joining region of the overlapping region. The materials or components are heated below the melting temperatures of the materials and are welded to at least partially form a diffusion bond by a welding method. A noble metal foil may be between the components to be connected. The diffusion bond is heated subsequently to a temperature below the melting temperature of the materials or components and the bond is mechanically recompacted by hammering.

Abstract: A method for producing permanent integral connections of oxide-dispersed metallic materials by welding. The materials or components to be connected are overlapped to form an overlapping region in a joining region of the overlapping region. The materials or components are heated below the melting temperatures of the materials and are welded to at least partially form a diffusion bond by a welding method. A noble metal foil may be between the components to be connected. The diffusion bond is heated subsequently to a temperature below the melting temperature of the materials or components and the bond is mechanically recompacted by hammering.

Abstract: For simple and rapid production of a shaped body comprising fused silica and a shaped body which leads to virtually no contamination of a melt in contact with the shaped body even at high temperatures, the invention provides a process comprising the steps: a) provision of fused silica in the form of essentially amorphous SiO2 grains of which not more than 5% have a diameter greater than 15 mm, b) addition of water to the fused silica grains to produce a slip, c) casting of the slip into a mould which comprises a hollow body having the inverse shape of the shaped body to be produced, d) drying of the slip to give an intermediate body, e) sintering of the intermediate body at a sintering temperature at which at least part of the fused silica is transformed from the amorphous modification into a crystalline modification, f) cooling of the sintered shaped body to a temperature below 300° C., so that a microstructure containing crystalline SiO2 is formed, and also a shaped body which comprises at least 99.

Abstract: To provide a material for use at high temperatures of several 100° C. which is simple and quick to produce, the invention provides a composite having a layer structure and a process for producing it, which comprises the following steps: a) provision of at least two plates which each have at least one main area of extension, b) stacking of the plates in such a way that a main area of extension of one plate is essentially opposite a main area of extension of the subsequent plate in the stack, c) joining of the stacked plates to form a block using a sinterable composition, d) carrying out a heat treatment on the block so that at least sintering of the sinterable composition occurs and a strong composite body is formed from the block.

Abstract: The invention includes an improved quartz glass body, especially an improved quartz glass crucible for melting non-metals, non-ferrous metals, or silicon, and a method and casting mold for making it The quartz glass body is made by a method in which a quartz glass-water mixture is supplied to a casting mold comprising an outer part and an inner part, dried in the mold, and put under an overpressure during the drying. Later a resulting green glass body is removed from the mold. At least a portion of the shaping surfaces of the inner part of the mold are surfaces of a water-impermeable substance. The method provides a cast body with a reduced tendency to crack and with a smaller open porosity.

Abstract: A method for producing permanent integral connections of oxide-dispersed metallic materials by welding. The materials or components to be connected are overlapped to form an overlapping region in a joining region of the overlapping region. The materials or components are heated below the melting temperatures of the materials and are welded to at least partially form a diffusion bond by a welding method. A noble metal foil may be between the components to be connected. The diffusion bond is heated subsequently to a temperature below the melting temperature of the materials or components and the bond is mechanically recompacted by hammering.

Abstract: A method for producing permanent integral connections of oxide-dispersed metallic materials by welding. The materials or components to be connected are overlapped to form an overlapping region in a joining region of the overlapping region. The materials or components are heated below the melting temperatures of the materials and are welded to at least partially form a diffusion bond by a welding method. A noble metal foil may be between the components to be connected. The diffusion bond is heated subsequently to a temperature below the melting temperature of the materials or components and the bond is mechanically recompacted by hammering.

Abstract: A method for producing permanent integral connections of oxide-dispersed metallic materials by welding. The materials or components to be connected are overlapped to form an overlapping region in a joining region of the overlapping region. The materials or components are heated below the melting temperatures of the materials and are welded to at least partially form a diffusion bond by a welding method. A noble metal foil may be between the components to be connected. The diffusion bond is heated subsequently to a temperature below the melting temperature of the materials or components and the bond is mechanically recompacted by hammering.

Abstract: The container is a glass bottle (10) encased with a plastic coating (4) from its base section (3) to a sealing rim (2) around its mouth (M) in order to protect against shattering or explosive failure. The glass bottle, preferably a glass inlet, is fillable under pressure with a sprayable medically active substance and a propellant and provided with a delivery element attached to the sealing rim. To facilitate lower injection molding temperatures and pressures and to permit autoclaving at high temperatures the glass bottle with the plastic coating (4) is made by a method which includes injecting at least one reactively cross-linkable plastic capable of being heat-softened into a mold surrounding the glass bottle and forming the plastic coating (4) by a reaction injection molding (RIM) method.

Abstract: A method for producing permanent integral connections of oxide-dispersed metallic materials by welding. The materials or components to be connected are overlapped to form an overlapping region in a joining region of the overlapping region. The materials or components are heated below the melting temperatures of the materials and are welded to at least partially form a diffusion bond by a welding method. A noble metal foil may be between the components to be connected. The diffusion bond is heated subsequently to a temperature below the melting temperature of the materials or components and the bond is mechanically recompacted by hammering.

Abstract: This invention relates to optical, preferably ophthalmic lenses with a body made of plastic, in particular for spectacle glasses, and the plastic incorporates cycloolefinic polymers and the plastic body is coated with a transparent coating resistant to corrosion. Another object of this invention is a process for the production of these lenses. The lenses according to the invention are especially resistant to greases, sweat and/or solvents.

Abstract: Process for the production of decorative glass ceramic articles, the design being sunk entirely or partially into the surface of the glass ceramic, wherein the surface, to be decorated, of the not-yet ceramed base glass is connected as the anode of the region of its glass transition temperature Tg up to Tg+100.degree. C. and a current is allowed to flow evoking an alteration of the surface of the base glass, and wherein the current is permitted to flow until the surface has been altered to a desired depth.

Abstract: In a window for ovens, in particular household baking ovens, with a window structure that consists of several panes (10, 28, 32), at least one of the panes (28) is angled in comparison to the other panes (10, 32). Because of this a lower outer surface temperature results on the outer pane (32) of the multiple pane arrangement turned away from the oven inner chamber (12) with elevated temperature. The frame (16, 34) of the multiple pane arrangement can also have openings (36) on the top and bottom in the area between the outside pane (32) and the center pane (28). In combination with this measure, which permits convection of the outside air through the outer pane intermediate space (arrows 38), an additional reduction of the temperature of the outer pane (32) can be achieved. This air convection can be increased by the fact that the angled center pane (28) converges toward the outer pane (32) at the top.