Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zum Herstellen einer Siliziumdioxidsuspension beinhaltend die Verfahrensschritte: Bereitstellen eines Siliziumdioxidpulvers und einer Flüssigkeit; Mischen des Siliziumdioxidpulvers mit der Flüssigkeit unter Erhalt einer Aufschlämmung; Behandeln der Aufschlämmung mit Ultraschall unter Erhalt einer Vorläufersuspension; Leiten zumindest eines Teils der Vorläufersuspension durch eine erste mehrstufige Filtervorrichtung, wobei die erste mehrstufige Filtervorrichtung zumindest eine erste, eine zweite und eine dritte Filterstufe aufweist, wobei jede Filterstufe mindestens einen Filter beinhaltet wobei die zweite Filterstufe stromabwärts von der ersten Filterstufe und die dritte Filterstufe stromabwärts von der zweiten Filterstufe angeordnet ist, wobei die erste Filterstufe eine Filterfeinheit von 5 μm oder mehr, wobei die zweite Filterstufe eine Filterfeinheit in einem Bereich von 0,5 bis 5 μm aufweist, wobei die dritte Filterstufe eine Filterfeinheit von 1 μm oder weniger aufweist, und wobei mindestens eine der Filterstufen ausgewählt aus der ersten, zweiten und dritten Filterstufe eine Abscheiderate von 99,5% oder mehr aufweist. Die Erfindung betrifft auch eine so erhältlich Siliziumdioxidsuspension, daraus erzeugbare Granulate und Folgeprodukte.
Abstract:
Es sind Verfahren zur Herstellung einer Antiresonanten Hohlkernfaser bekannt, die einen sich entlang einer Faser-Längsachse erstreckenden Hohlkern und einen den Hohlkern umgebenden inneren Mantelbereich aufweist, der mehrere Antiresonanzelemente umfasst. Die bekannten Verfahren umfassen die Verfahrensschritte: des Bereitstellens eines Hüllrohres, das eine Hüllrohr- Innenbohrung und eine Hüllrohr-Längsachse aufweist, entlang der sich eine von einer Innenseite und einer Außenseite begrenzte Hüllrohr-Wandung erstreckt; des Bereitstellens einer Anzahl von rohrförmigen Antiresonanzelement-Vorformlingen; des Anordnens der Antiresonanzelement-Vorformlinge an Soll-Positionen der Innenseite der Hüllrohr-Wandung unter Bildung einer primären Vorform, die einen hohlen Kernbereich und einen inneren Mantelbereich aufweist; der Weiterverarbeitung der primären Vorform zu einer sekundären Vorform, wobei die Weiterverarbeitung ein Elongieren umfasst, und des Ziehens der sekundären Vorform zu der Hohlkernfaser. Um hiervon ausgehend eine hohe Präzision und eine exakte Positionierung der Antiresonanzelemente in einer ausreichend stabilen und reproduzierbaren Weise zu erreichen, wird erfindungsgemäß vorgeschlagen, dass beim Elongieren der primären Vorform mindestens einem Teil der vormaligen rohrförmigen Antiresonanzelement-Vorformlinge der primären Vorform eine ovale Außenquerschnittsform aufgeprägt wird, indem im hohlen Kernbereich und in den rohrförmigen Antiresonanzelement-Vorformlingen derselbe Innendruck erzeugt und aufrechterhalten wird.
Abstract:
Apparatus and method for producing elongated glass components with low bow. The apparatus may include a heating element to heat a bulk glass component where a strand may be drawn from the bulk glass component in a downward direction and a gripper device including a clamping element to support the strand while pulling or drawing it from the bulk glass component in a linear motion, and a low- friction mounting element attached to the clamping element which allows translational movement of the clamping element in an x-y plane. The gripper device may further be used to reduce bow in the strand while it is being drawn by moving the clamping element on the mounting element in a direction opposite the direction of any measured transverse acceleration.
Abstract:
The invention relates to a method for producing a glass article having a compressive stress zone close to the surface by redrawing a preform having a rectangular cross-section. The preform comprises at least a first and a second glass, wherein both glasses are not connected to each other in the preform in a force-fitting manner. The second glass has a higher thermal expansion coefficient than the first glass and is located in the preform in the interior of the glass tube of the first glass. The invention further relates to a glass laminate having increased strength, which is composed as an at least three-layer composite material of at least two different glasses. The individual layers of the layer composite are connected to each other over the entire area and in a non-positive manner, in particular by melting, and the glass laminate has a thermally stable compressive stress zone in the areas close to the surface of the layer composite and a tensile stress zone in the inner region of the layer composite.
Abstract:
A method of forming an opaque quartz glass component is provided. The method includes (a) providing a starting preform made of quartz glass; (b) heating at least a portion of the starting preform to a predetermined temperature at which the quartz glass of the starting preform has a viscosity in a range of 10E2 to 10E12 poise; and (c) deforming at least a portion of the heated preform at the predetermined temperature to change a shape and/or dimension(s) of the heated perform in order to form the opaque quartz glass component. The starting preform and the heated preform have respective densities of at least 2.15 g/cm 3 and at least 2.10 g/cm 3 . The starting perform and the opaque quartz glass component have respective direct spectral transmissions of approximately 0.1-1% and 0.2-3% in the wavelength range of λ=190 nm to λ=4990 nm at a wall thickness of 3 mm and a diffuse reflectance of at least 60% in a wavelength range of λ=190 nm to λ=2500 nm.
Abstract translation:提供了形成不透明石英玻璃部件的方法。 该方法包括(a)提供由石英玻璃制成的起始预制件; (b)将起始预型件的至少一部分加热到预定温度,在预定温度下,起始预型件的石英玻璃的粘度在10E2至10E12泊的范围内; 和(c)使加热的预制件的至少一部分在预定温度下变形,以改变加热的表面的形状和/或尺寸,以便形成不透明的石英玻璃组分。 起始预成型件和加热的预制件具有至少2.15g / cm 3和至少2.10g / cm 3的相应密度。 起始性能和不透明石英玻璃组分在λ= 190nm至λ= 4990nm的波长范围内在壁厚为3mm的情况下分别具有约0.1-1%和0.2-3%的直接光谱透射率,漫反射率 在λ= 190nm至λ= 2500nm的波长范围内至少为60%。
Abstract:
In a known method for producing a tube of quartz glass by elongating a hollow cylinder of quartz glass having an outer diameter AD, said cylinder is continuously supplied to a heating zone with a vertically oriented heating tube having an inner diameter d, with the proviso that the diameter ratio d/AD is set to a value ranging from 1.02 to 1.7. The hollow cylinder is softened therein zonewise, and a tubular strand is drawn off from the softened region and shortened to obtain the tube. Starting therefrom, in order to optimize the dimensional stability of the quartz glass tube obtained, it is suggested according to the invention that the heating zone should have a length L which is set such that the ratio L/d is smaller than 0.9..
Abstract:
A plasma torch (40) deposits silica on a target rod (30). The torch (40) traverses along the lathe (24) multiple times, so as to build up the preform (34).
Abstract:
A manufacturing method of an optical lens characterized by comprising a 1st optical member base material producing process in which a 1st optical member base material (40), made of 1st light transmitting material so as to have a pillar shape and having a curved-surface 1st optical action unit (11) on its side plane, is produced, a primary drawing process in which the 1st optical member base material produced in the 1st optical member base material producing process is drawn until it has a required outer diameter, and a 1st optical member producing process in which the 1st optical member base material (40) drawn in the primary drawing process is sliced to produce a pillar-shaped 1st optical member (2). Since the shape of the optical lens, particularly the shape of the 1stoptical action unit (11) can be determined in a base material stage before the primary drawing process by the manufacturing method of an optical lens like this, the base material can be processed in a sufficiently large dimension state, so that the processing works can be practiced easily and accurately.
Abstract:
According to a prior art method for producing a cylindrical component comprised of silica glass, a cylinder comprised of a softened silica glass mass is drawn in a predetermined drawing direction along a drawing axis by means of a drawing device which acts upon said cylinder. The aim of the invention is to provide a method which prevents, to the greatest possible extent, warping of the drawn cylinder and other deviations from the ideal cylinder dimensions and to prevent, to the greatest possible extent, the outer surface of the drawn cylinder from being touched. To these ends, the invention provides that the drawing device comprises a plurality of guide elements which are arranged one behind the other along the drawing axis, and which can be displaced independently of one another in a drawing direction and in a direction opposite thereto. At least two of said guide elements which maintain an engaging distance from one another are simultaneously displaced, in a frictionally engaged manner, on the cylinder in a drawing direction and with an identical drawing speed. A device suited for carrying out the inventive method comprises a feed device, a heating zone and a drawing device by means of which a cylinder is drawn along a drawing axis and in a predetermined drawing direction with a controlled drawing speed. The drawing device comprises a number of guide elements which are arranged one behind the other along the drawing axis and which can be displaced independently of one another in a drawing direction and in a direction opposite thereto.
Abstract:
The present invention describes a glass honeycomb structure (100) having a variety of shapes and sizes depending on its ultimate application. Unlike prior art honeycomb structures made from ceramics, the inventive glass honeycomb can be readily bent and/or redrawn. Furthermore, the inventive honeycomb structure is light-weight, yet able to support heavy loads on its end faces (10a, 10b). Therefore, the inventive honeycomb can be used as a light-weight support for such objects as mirrors. Other useful properties of the extruded glass honeycomb are its high softening temperature, its transparency to ultraviolet and visible light, and its ability to be redrawn. Embodiments that rely upon one or more of these properties include: a bio-reactor, a membrane reactor, a capillary flow controller, a high efficiency filtration system, in-situ water treatment, high temperature dielectric material, and photonic band gap material.