Abstract:
The invention starts from a known method for producing a glass body, comprising forming a cylindrical blank by successive deposition of a plurality of material layers on the outer surface of a substrate body which is rotating about its longitudinal axis, by using an arrangement of a plurality of depositors which are directed onto the substrate body and which are fed via supply lines with process media for material layer deposition and which are moved without a reversing movement relative to the longitudinal axis of the substrate body. Starting therefrom, to provide a method for producing a glass body of high homogeneity that can be realized in a constructionally simple way, the invention suggests that the movement of the depositor arrangement along the longitudinal axis of the substrate body should be accompanied by a displacement of the substrate body. An apparatus suited for performing the method is distinguished by a displacement device for a displacement of the soot body which is accompanied by the movement of the depositor arrangement along the longitudinal axis of the substrate body.
Abstract:
A known method for producing a hollow cylinder of synthetic quartz glass comprises the steps of: (a) providing an inner tube of synthetic quartz glass having an inner bore defined by an inner wall, (b) cladding the inner tube (3′) with an SiO2 soot layer (4′), and (c) sintering the SiO2 soot layer with formation of the hollow cylinder. Starting therefrom, to indicate a method in which on the one hand the sintering process is completed before the hollow cylinder is further processed together with the core rod, and in which on the other hand a complicated machining of the inner bore of the hollow cylinder of quartz glass is not required, the invention suggests that during sintering the surface temperature of the inner wall of the inner tube should be kept below the softening temperature.
Abstract:
Known methods for producing a semifinished product for an optical component of synthetic quartz glass of high homogeneity require a great number of forming or shaping steps for homogenization, which is troublesome in terms of energy and time and entails the risk that impurities might be introduced. To avoid these drawbacks, a method modification is suggested that comprises the following method steps: (a) feeding a silicon-containing start compound, which can be converted by oxidation or hydrolysis into SiO2, to a deposition burner, and forming amorphous SiO2 particles in a burner flame assigned to the deposition burner, (b) forming a substantially solid-cylinder SiO2 blank by depositing the SiO2 particles onto a support with a longitudinal axis by way of successive layers, of which most extend in parallel with the longitudinal axis of the support and which extend in the direction of the outer surface of the blank, (c) homogenizing the SiO2 blank, including twisting along an axis of rotation extending coaxially to or in parallel with the longitudinal cylinder axis while forming the semifinished product. A blank suited for performing the method of the invention and shaped in the form of a substantially solid-cylinder SiO2 soot body from successive SiO2 layers is characterized in that most of the layers extend in parallel with the longitudinal axis of the soot body and in the direction of the outer surface of the soot body.