Patents Assigned to Heraeus Quarzglas GmbH & Co., KG
  • Publication number: 20200131069
    Abstract: A known method for homogenizing glass includes the following steps: providing a cylindrical blank composed of the glass, having a cylindrical outer surface which extends between a first end face and a second end face, forming a shear zone in the blank by softening a longitudinal section of the blank and subjecting it to a thermal-mechanical intermixing treatment, and moving the shear zone along the longitudinal axis of the blank. To reduce the risk of cracks and fractures during homogenizing, it is proposed that a thermal radiation dissipator is used that at least partially surrounds the shear zone, the lateral dimension of which in the direction of the longitudinal axis of the blank is greater than the shear zone and smaller than the length of the blank, the thermal radiation dissipator being moved synchronously with the shear zone along the longitudinal axis of the blank.
    Type: Application
    Filed: October 24, 2019
    Publication date: April 30, 2020
    Applicant: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Stephan Thomas, Jan Vydra, Martin Trommer, Michael Huenermann, Andreas Langner, Walter Lehmann, Stefan Hengster, Klaus Becker
  • Publication number: 20200131071
    Abstract: A method for homogenizing glass includes the method: providing a cylindrical blank composed of the glass having a cylindrical outer surface that extends along a longitudinal axis of the blank between a first end face and a second end face, forming a shear zone in the blank by softening a longitudinal section of the blank and subjecting it to a thermal-mechanical intermixing treatment, and displacing the shear zone along the longitudinal axis of the blank. To enable a radial mixing within the shear zone in addition to the tangential mixing with the lowest possible time and energy input, starting from this method, cylindrical sections of the blank are adjacent to the shear zone on both sides, the first cylindrical section having a first central axis and the second cylindrical section having a second central axis, the first central axis and the second central axis being temporarily non-coaxial with each other.
    Type: Application
    Filed: October 24, 2019
    Publication date: April 30, 2020
    Applicant: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Stephan Thomas, Jan Vydra, Martin Trommer, Michael Huenermann, Andreas Langner, Walter Lehmann, Stefan Hengster, Klaus Becker
  • Publication number: 20200123039
    Abstract: One aspect relates to a process for the preparation of a quartz glass body including: i.) providing a silicon dioxide granulate, ii.) making a first glass melt out of the silicon dioxide granulate, iii.) making a glass product out of at least one part of the glass melt, iv.) reducing the size of the glass product to obtain a quartz glass grain, v.) making a further glass melt from the quartz glass grain and vi.) making a quartz glass body out of at least one part of the further glass melt. Furthermore, one aspect relates to a quartz glass body obtainable by this process. Furthermore, one aspect relates to a reactor, which is obtainable by further processing of the quartz glass body.
    Type: Application
    Filed: June 13, 2018
    Publication date: April 23, 2020
    Applicant: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Boris Gromann, Marcus Constantin Goebel, Nils Christian Nielsen, Michael Huenermann, Kathrin Wissel-Stoll
  • Patent number: 10618833
    Abstract: The invention relates to a process for the preparation of a quartz glass grain comprising the process steps i.) Providing a silicon dioxide granulate from a pyrogenically produced silicon dioxide powder, ii.) Making a glass melt out of silicon dioxide granulate, iii.) Making a quartz glass body out of at least part of the glass melt and iv.) Reducing the size of the quartz glass body to obtain the quartz glass grain. The invention further relates to a quartz glass grain which is obtainable by this process. The invention further relates to opaque quartz glass bodies, which are obtainable by further processing of the quartz glass grain.
    Type: Grant
    Filed: December 16, 2016
    Date of Patent: April 14, 2020
    Assignee: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Martin Arndt, Matthias Otter, Walter Lehmann, Michael Hünermann, Nils Christian Nielsen, Nigel Robert Whippey, Boris Gromann, Abdoul-Gafar Kpebane
  • Publication number: 20200109078
    Abstract: A method of producing a capillary tube from glass includes zonally softening a tubular preform having an outer diameter DOD, an inner diameter DID and a diameter ratio Drel—with Drel=DOD/DID—in a heating zone heated to a draw temperature Tdraw and drawing off continuously from the softened region a capillary strand having an outer diameter dAD, an inner diameter dID and a diameter ratio drel—with drel=dOD/dID—at a draw speed vdraw and cutting the capillary to length therefrom. For cost-effective production of a thick-walled capillary by drawing from a preform without strict requirements for the geometry and dimensional accuracy of the preform, the capillary bore is subjected in the heating zone to a shrinkage process based on the action of draw temperature Tdraw and surface tension, such that the diameter ratio drel of the capillary strand is adjusted to a value greater than the diameter ratio Drel of the preform by at least a factor of 5.
    Type: Application
    Filed: October 9, 2019
    Publication date: April 9, 2020
    Applicant: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Stefan Weidlich, Clemens Schmitt, Joerg Werner
  • Patent number: 10590022
    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.
    Type: Grant
    Filed: January 22, 2015
    Date of Patent: March 17, 2020
    Assignees: HERAEUS QUARTZ NORTH AMERICA LLC, HERAEUS QUARZGLAS GMBH & CO. KG
    Inventors: Georges Levon Fattal, James E. Beavers, Jr., Oliver Ganz, Kai Huei Chang
  • Publication number: 20200033272
    Abstract: One aspect is an apparatus for analyzing particles a capillary as a measuring cell with a hollow channel for receiving or passing through a test sample containing the particles includes a light source for generating a light beam, an optical device for coupling the light beam into the hollow channel at an input point for the purpose of illuminating the test sample, and a detector for detecting scattered light exiting the hollow channel. In one aspects, the hollow channel has an internal diameter DH in the range of 10 ?m to 60 ?m, that the light beam has a radial light intensity distribution with a minimum beam diameter DL, wherein the following applies to the diameter ratio DL/DH: 0.05<DL/DH<2.00, and that the light beam has an angle of incidence of less than 2 degrees in relation to the hollow channel's longitudinal axis on entering the hollow channel.
    Type: Application
    Filed: July 26, 2019
    Publication date: January 30, 2020
    Applicant: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Stefan Weidlich, Markus Schmidt
  • Patent number: 10544056
    Abstract: A method and apparatus are provided for producing a tube of glass by zonewise heating and softening of a hollow cylinder by a movable heating zone while rotating about its rotation axis. The glass tube is continuously formed by radial expansion of the softened region under action of centrifugal force and/or internal overpressure applied in the hollow-cylinder bore. The method and apparatus make it possible to deform the hollow cylinder in a single or a small number of forming steps into a glass tube having a larger outer diameter and high dimensional accuracy by determining a circumferential position at which the wall thickness is comparatively small, and during heating and softening of the rotating hollow cylinder a coolant is dispensed from a coolant source onto the deformation zone only when or predominantly when the circumferential position having the comparatively small wall thickness passes the coolant source.
    Type: Grant
    Filed: March 26, 2018
    Date of Patent: January 28, 2020
    Assignee: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Boris Gromann, Matthias Söhn, Alexander Blumenau
  • Patent number: 10513454
    Abstract: A method for producing synthetic fused quartz is provided. The method includes evaporating a feedstock material which contains at least one polymerizable polyalkylsiloxane compound, and supplying the feedstock material vapor to a reaction zone, wherein the feedstock material vapor is converted by oxidation and/or by hydrolysis into SiO2 particles. The feedstock material vapor is passed through a membrane filter as a cleaning device to reduce the formation of gel, which is typically associated with the production of synthetic fused quartz.
    Type: Grant
    Filed: February 17, 2016
    Date of Patent: December 24, 2019
    Assignee: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Norbert Otto, Martin Trommer
  • Patent number: 10508973
    Abstract: A method for determining the refractive index profile of a preform is provided.
    Type: Grant
    Filed: October 17, 2017
    Date of Patent: December 17, 2019
    Assignee: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Maximilian Schmitt, Bodo Kühn
  • Patent number: 10464837
    Abstract: Methods for producing glass components and obtainted glass component, e.g. optical fiber preform. A method includes providing a cladding tube (110) with a longitudinal axis including a first and a second bore separated by a chamfered region (114); inserting a spacer (120) into the first bore; inserting a rod (130) into the first bore (116); moving the spacer (120) into the chamfered section (114), causing the spacer (120) to rotate within the chamfered region (114); and rotating the cladding tube (110) into a vertical orientation, whereby the spacer (120) is prevented from entering the second bore (118) and supports the rod (130). Each portion of the chamfered region has a height perpendicular to the longitudinal axis greater than the height of the second bore.
    Type: Grant
    Filed: June 2, 2015
    Date of Patent: November 5, 2019
    Assignees: HERAEUS QUARTZ NORTH AMERICA LLC, HERAEUS QUARZGLAS GMBH & CO. KG
    Inventors: Alexander Rudl, Timothy D. Jenkins
  • Patent number: 10468712
    Abstract: A method for producing carbon particles having a core/shell structure includes infiltrating a pore-containing template material with a first precursor for carbon of a first variety, carbonizing the first precursor to form a deposit of the carbon of the first variety, infiltrating the remaining pore space with a second precursor for carbon of a second variety to form a second deposit of the carbon of the second variety which has a second porosity lower than the first porosity, and removing the template material to form the carbon particles. The template material is provided as template particles and the first precursor is provided as precursor particles of meltable and polymerizable material. The infiltration occurs in the molten phase so that the first precursor is foamed before or during the carbonization to form a pore-containing carbon foam. In an intermediate product, pores of the template material are at least partially filled.
    Type: Grant
    Filed: January 26, 2015
    Date of Patent: November 5, 2019
    Assignee: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Matthias Otter, Jörg Becker, Sascha Pihan, Christian Neumann
  • Patent number: 10358373
    Abstract: A method for producing a pore-containing opaque quartz glass includes: (a) producing porous SiO2 granulate particles from synthetically produced SiO2, (b) thermally densifying the SiO2 granulate particles to form partly densified SiO2 granulate particles, (c) forming a dispersion from the partly densified SiO2 granulate particles, (d) comminuting the partly densified SiO2 granulate particles to form a slip containing comminuted SiO2 granulate particles, (e) shaping the slip into a shaped body and forming a porous SiO2 green body with a green density rG, and (f) sintering the SiO2 green body into opaque quartz glass. To produce opaque quartz glass that is also suited for the use of spray granulate, during step (b), partly densified SiO2 granulate particles are produced with a specific surface BET-(A) between 0.025 and 2.5 m2/g, and during step (d), comminuted SiO2 granulate particles are produced with a specific surface BET-(B) between 4 and 10 m2/g.
    Type: Grant
    Filed: May 23, 2017
    Date of Patent: July 23, 2019
    Assignee: HERAEUS QUARZGLAS GMBH & CO. KG
    Inventors: Christian Schenk, Gerrit Scheich, Nadine Tscholitsch
  • Patent number: 10340512
    Abstract: The invention relates to a composite made of a porous carbon and an active material containing sulphur and to method for producing same. A method for producing a composite made of a porous carbon structure and sulphur is disclosed, said composite being characterized by a high capacitance and a low capacitance loss, when used as an electrode material for a lithium-sulphur secondary battery. According to the invention, a dispersion of carbon powder, an active material containing sulphur and an aqueous medium are treated hydrothermally at a temperature sufficient for melting sulphur. The liquid phase which forms, which contains the melted sulphur and water, infiltrates the pores of the porous carbon.
    Type: Grant
    Filed: May 23, 2017
    Date of Patent: July 2, 2019
    Assignee: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Matthias Otter, Jörg Becker, Sascha Pihan, Christian Neumann
  • Patent number: 10336645
    Abstract: A method for producing rare earth metal-doped quartz glass includes the steps of (a) providing a blank of the rare earth metal-doped quartz glass, and (b) homogenizing the blank by softening the blank zone by zone in a heating zone and by twisting the softened zone along a rotation axis. Some rare earth metals, however, show a discoloration of the quartz glass, which hints at an unforeseeable and undesired change in the chemical composition or possibly at an inhomogeneous distribution of the dopants. To avoid this drawback and to provide a modified method which ensures the production of rare earth metal-doped quartz glass with reproducible properties, during homogenization according to method step (b), the blank is softened under the action of an oxidizingly acting or a neutral plasma.
    Type: Grant
    Filed: June 27, 2017
    Date of Patent: July 2, 2019
    Assignee: Heraeus Quarzglas GmbH & Co., KG
    Inventors: Hardy Baierl, Stephan Grimm, Kay Schuster, Jan Dellith, Andreas Langner, Gerhard Schoetz, Walter Lehmann, Thomas Kayser
  • Patent number: 10322962
    Abstract: A method for producing substrate tubes of quartz glass includes continuously supplying a hollow cylinder of quartz glass to a heating zone, softening the hollow cylinder zonewise in the heating zone, and drawing off a tubular strand from the softened portion. The hollow cylinder has an outer diameter Ca, an inner diameter Ci and an inner bore. The tubular strand has an outer diameter Ta and an inner diameter Ti. The following parameters are applicable to the hollow cylinder and the tubular strand: Ca>180 mm, Cr>3 with Cr=Ca/Ci, Tr<1.6 with Tr=Ta/Ti and Ci/Ti<2.5. The blow pressure in an inner bore is adjusted to a value in the range of 4 to 10 mbar. Substrate tubes, obtained by cutting the tubular strand to the desired length, serve as semi-finished products for the manufacture of preforms for optical fibers.
    Type: Grant
    Filed: June 29, 2016
    Date of Patent: June 18, 2019
    Assignee: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Oliver Ganz, Harald Hain
  • Patent number: 10315947
    Abstract: A method for forming a hollow cylinder, in a single step, into a quartz glass tube with a large outer diameter and high dimensional stability is provided. To produce the tube, the cylinder, while rotating, is softened in portions in a heating zone which is moved at a relative feed rate Va and the softened portion is radially expanded by a centrifugal force and/or internal overpressure applied in the hollow cylinder bore so as to form a deformation zone. The radial expansion of the softened portion is carried out at a location-dependent radial expansion rate Vr, the profile of which along the deformation zone has a maximum value Vr,max which is smaller than 20 cm/min. The temperature in a rear heating portion of the heating zone, assigned to the end of the deformation zone, is lower than in a front heating portion assigned to the beginning of the deformation zone.
    Type: Grant
    Filed: July 12, 2017
    Date of Patent: June 11, 2019
    Assignee: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Boris Gromann, Nigel Whippey
  • Publication number: 20190162678
    Abstract: Measurement methods are known for determining the concentration of an ingredient in a body of ceramic or glassy material, in which the optical path length or the signal propagation time of a measurement wave penetrating the body of ceramic or glassy material in a measurement direction is determined and evaluated. Starting therefrom, in order to indicate a non-destructive method for determining a concentration of an ingredient in a body of ceramic or glassy material, which is also suitable for measurement in the production process of the body concerned, it is suggested according to one embodiment that modulated gigahertz radiation is used as the measurement wave.
    Type: Application
    Filed: November 28, 2018
    Publication date: May 30, 2019
    Applicant: Heraeus Quarzglas GmbH & Co. KG
    Inventor: Helmut FRIEDRICH
  • Publication number: 20190152827
    Abstract: One aspect relates to a process for the preparation of a quartz glass body, including providing a silicon dioxide granulate, making a glass melt out of silicon dioxide granulate and making a quartz glass body out of at least part of the glass melt. The silicon dioxide granulate is obtained by providing and processing a silicon dioxide powder. One aspect also relates to silicon dioxide granulate, which is obtained by providing a silicon dioxide powder and processing it. One aspect further relates to a quartz glass body which is obtainable by this process. One aspect further relates to a light guide, an illuminant and a formed body, which are each obtainable by further processing of the quartz glass body.
    Type: Application
    Filed: December 16, 2016
    Publication date: May 23, 2019
    Applicant: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Matthias OTTER, Walter LEHMANN, Michael HÜNERMANN, Nils Christian NIELSEN, Martin TROMMER
  • Patent number: 10287705
    Abstract: In a known method for pulling a semiconductor single crystal according to the Czochralski method, a semiconductor melt is produced in a silica glass crucible and the semiconductor single crystal is pulled from said melt. The inner wall of the silica glass crucible and the exposed melt surface are in contact with one another and with a respective melt atmosphere in the region of a contact zone running radially around the crucible inner wall, and primary oscillations of the melt are triggered in said contact zone. On this basis, in order to provide a method characterized by reduced melt vibrations and in particular by a simple, short accretion process, according to the invention primary oscillations are triggered which differ from one another in their frequency.
    Type: Grant
    Filed: December 6, 2017
    Date of Patent: May 14, 2019
    Assignee: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Michael Hünermann, Thomas Kayser, Walter Lehmann