Patents Assigned to H. C. Starck GmbH
  • Patent number: 9879333
    Abstract: A process for producing a component includes providing a composition comprising hard material particles and a binder metal, and sintering the composition at a sintering temperature of from 1250° C. to 1400° C. for a period of from 3 to 15 minutes. The hard material particles comprise an inner core comprising fused tungsten carbide and an outer shell comprising tungsten carbide. The binder metal is selected from the group consisting of Co, Ni, Fe and alloys comprising at least one metal selected from Co, Ni and Fe.
    Type: Grant
    Filed: October 26, 2012
    Date of Patent: January 30, 2018
    Assignee: H. C. STARCK GMBH
    Inventors: Christian Gerk, Markus Zumdick
  • Patent number: 9856546
    Abstract: The invention provides for a cermet powder containing 75-90% by weight of at least one hard material powder, from 10 to 25% by weight of one or more matrix metal powders and up to 3% by weight of at least one modifier, wherein the matrix metal powder or powders contain from 0 to 38% by weight of cobalt, from 0 to 38% by weight of nickel, from 0 to 20% by weight of aluminum, from 0 to 90% by weight of iron and from 10 to 35% by weight of chromium and the sum of the contents of iron and chromium is in the range from 10 to 95% by weight and the sum of the contents of cobalt, nickel and iron is in the range from 65 to 95% by weight. The invention also relates to a cermet and a process to make the cermet containing the cermet powder and shaped article coated with the cermet powder and a process to make the shaped article.
    Type: Grant
    Filed: September 21, 2007
    Date of Patent: January 2, 2018
    Assignee: H. C. Starck GmbH
    Inventors: Jürgen Fischer, Aloys Eiling, Frank Schrumpf, Stefan Zimmermann, Peter Thienel, Roland Scholl
  • Patent number: 9821372
    Abstract: A method for producing a composite material includes providing a composition comprising at least one hardness carrier and a base binder alloy, and sintering the composition. The base binder alloy comprises from 66 to 93 wt.-% of nickel, from 7 to 34 wt.-% of iron, and from 0 to 9 wt.-% of cobalt, wherein the wt.-% proportions of the base binder alloy add up to 100 wt.-%.
    Type: Grant
    Filed: May 24, 2012
    Date of Patent: November 21, 2017
    Assignee: H. C. STARCK GMBH
    Inventor: Benno Gries
  • Patent number: 9540715
    Abstract: A cermet powder includes a) from 50 to 90 wt-% of at least one hard material, and b) from 10 to 50 wt-% of a matrix metal composition. The wt.-% for a) and b) are based on a total weight of the cermet powder. The matrix metal composition comprises i) from 40 to 75 wt-% of iron and nickel, ii) from 18 to 35 wt-% of chromium, iii) from 3 to 20 wt.-% of molybdenum, and iv) from 0.5 to 4 wt-% of copper. The wt-% for i) to iv) are based in each case on a total weight of the matrix metal composition. A weight ratio of iron to nickel is from 3:1 to 1:3.
    Type: Grant
    Filed: September 4, 2012
    Date of Patent: January 10, 2017
    Assignee: H. C. STARCK GMBH
    Inventors: Stefan Zimmermann, Benno Gries
  • Patent number: 9085468
    Abstract: A niobium suboxide powder comprising niobium suboxide particles having a bulk nitrogen content of between 500 to 20,000 ppm. The nitrogen is distributed in the bulk of the powder particles. The nitrogen at least partly is present in the form of at least one of Nb2N crystals or niobium oxynitride crystals.
    Type: Grant
    Filed: May 9, 2012
    Date of Patent: July 21, 2015
    Assignee: H. C. STARCK GMBH
    Inventors: Christoph Schnitter, Holger Brumm, Christine Rawohl, Colin McCracken
  • Patent number: 8995112
    Abstract: At least one of a valve metal sintered capacitor anode body and a suboxide valve metal sintered capacitor anode body with a particle density of >88% of a theoretical density.
    Type: Grant
    Filed: August 25, 2009
    Date of Patent: March 31, 2015
    Assignee: H. C. Starck GmbH
    Inventors: Christoph Schnitter, Holger Brumm
  • Patent number: 8992635
    Abstract: A process for producing anodes includes providing a foil comprising tantalum or niobium. A surface of the foil is oxidized so as to form oxides on the foil surface. The foil is heated so that the oxides formed on the foil surface diffuse into the foil. A paste comprising a powder selected from the group consisting of a tantalum powder, a niobium powder, a niobium oxide powder and mixtures thereof is applied to the foil. The foil with the applied paste is sintered.
    Type: Grant
    Filed: October 25, 2012
    Date of Patent: March 31, 2015
    Assignee: H. C. Starck GmbH
    Inventor: Ralph Otterstedt
  • Patent number: 8840861
    Abstract: A method for producing a workpiece comprising a layer of an additive-free silicon nitride includes providing a base body of the workpiece. A layer of a slip comprising a silicon powder is applied to an inside of the base body so as to obtain a coated base body. The coated base body is subjected to a reactive firing under nitrogen so as to convert the silicon powder to the additive-free silicon nitride.
    Type: Grant
    Filed: January 14, 2011
    Date of Patent: September 23, 2014
    Assignee: H. C. Starck GmbH
    Inventors: Rolf Wagner, Manuel Matussek
  • Patent number: 8815983
    Abstract: A dispersion comprising hard material particles and at least one organic binder and/or at least one plasticizer. The hard material particles comprise an inner core comprising a fused tungsten carbide and an outer shell comprising tungsten carbide.
    Type: Grant
    Filed: April 4, 2011
    Date of Patent: August 26, 2014
    Assignee: H. C. Starck GmbH
    Inventors: Christian Gerk, Ulf Waag
  • Patent number: 8801829
    Abstract: Process for the production of valve metal powders, in particular niobium and tantalum powder, by reduction of corresponding valve metal oxide powders by means of vaporous reducing metals and/or hydrides thereof, preferably in the presence of an inert carrier gas, wherein the reduction is performed at a vapor partial pressure of the reducing metal/metal hydride of 5 to 110 hPa and an overall pressure of less than 1000 hPa, and tantalum powder obtainable in this way having a high stability of the powder agglomerate particles.
    Type: Grant
    Filed: October 22, 2010
    Date of Patent: August 12, 2014
    Assignee: H. C. Starck GmbH & Co. KG
    Inventors: Helmut Haas, Ulrich Bartmann, Tadashi Komeya, Nobuyuki Sato
  • Patent number: 8802191
    Abstract: Disclosed is a process for the reprocessing or production of a sputter target or an X-ray anode wherein a gas flow forms a gas/powder mixture with a powder of a material chosen from the group consisting of niobium, tantalum, tungsten, molybdenum, titanium, zirconium, mixtures of two or more thereof and alloys thereof with at least two thereof or with other metals, the powder has a particle size of 0.5 to 150 ?m, wherein a supersonic speed is imparted to the gas flow and the jet of supersonic speed is directed on to the surface of the object to be reprocessed or produced.
    Type: Grant
    Filed: April 28, 2006
    Date of Patent: August 12, 2014
    Assignee: H. C. Starck GmbH
    Inventors: Stefan Zimmermann, Uwe Papp, Heinrich Kreye, Tobias Schmidt
  • Patent number: 8790607
    Abstract: Elemental boron with a boron content of at least 96.8% by weight, an oxygen content of at most 1.6% by weight, a nitrogen content of at most 0.2% by weight, a crystallinity of 30% by weight or less, and a particle size distribution with a d100 value of 9 ?m or less.
    Type: Grant
    Filed: August 28, 2009
    Date of Patent: July 29, 2014
    Assignee: H. C. Starck GmbH
    Inventor: Friedrich Wilhelm Karau
  • Patent number: 8747488
    Abstract: A process for producing a solid electrolyte capacitor with an anode comprising a sintered fine NbOx powder, where 0.5<x<1.7, includes forming a green anode body. The forming is essentially performed without applying a pressure. The green anode body is sintered so as to provide a sintered anode body. The sintered anode body is electrolytically oxidized so as to provide an electrolytically oxidized anode body. The electrolytically oxidized anode body is provided with a cathode so as to provide the solid electrolyte capacitor.
    Type: Grant
    Filed: December 7, 2009
    Date of Patent: June 10, 2014
    Assignee: H. C. Starck GmbH
    Inventors: Ralph Otterstedt, Marianne Gottschling
  • Patent number: 8440161
    Abstract: The invention is directed to ammonium paratungstate decahydrate containing at least 75% of crystals having a length of at least 200 ?m and having a ratio of length to width of less than 4.5:1.
    Type: Grant
    Filed: May 29, 2012
    Date of Patent: May 14, 2013
    Assignee: H. C. Starck GmbH
    Inventors: Viktor Stoller, Michael Erb, Juliane Meese-Marktscheffel, Michael Lohse, Klaus-Jürgen Marschall, Frank Schrumpf
  • Patent number: 8382880
    Abstract: A process for digesting molybdenum oxide concentrates includes suspending a molybdenum-containing starting material in an aqueous solution so as to obtain a suspension. While stirring, an oxidizing agent and an alkali solution of at least one alkali metal are metered to the suspension so as to set a pH and produce a product having a molybdenum content of at least 98% of the molybdenum-containing starting material. The alkali metal is selected from the group consisting of Na, K and Li.
    Type: Grant
    Filed: November 4, 2008
    Date of Patent: February 26, 2013
    Assignee: H. C. Starck GmbH
    Inventors: Josef Schmoll, Brigitte Schimrosczyk, Gisbert Ebeling, Joerg Henze
  • Patent number: 8187567
    Abstract: Disclosed is a niobium suboxide powder for the manufacture of capacitors with higher break down voltages, higher temperatures of operation and elongated lifetimes. The powder is doped with nitrogen which is at least partly present in the form homogeneously distributed, x-ray detectable Nb2N-crystal domains. The niobium suboxide powder contains niobium suboxide particles having a bulk nitrogen content of between 500 to 20,000 ppm.
    Type: Grant
    Filed: May 31, 2006
    Date of Patent: May 29, 2012
    Assignee: H. C. Starck GmbH
    Inventors: Christoph Schnitter, Holger Brumm, Christine Rawohl, Colin McCracken
  • Publication number: 20120033350
    Abstract: A process for producing a solid electrolyte capacitor with an anode comprising a sintered fine NbOx powder, where 0.5<x<1.7, includes providing a green anode body. The green anode body is sintered so as to provide a sintered anode body. The sintered anode body is formed so as to provide a formed anode body, wherein the forming is essentially performed without applying a pressure. The formed anode body is provided with a cathode so as to provide the solid electrolyte capacitor.
    Type: Application
    Filed: December 7, 2009
    Publication date: February 9, 2012
    Applicant: H. C. STARCK GMBH
    Inventors: Ralph Otterstedt, Marianne Gottschling
  • Patent number: 8058135
    Abstract: The invention relates to a process for the production of electrolyte capacitors having a low equivalent series resistance and low residual current, electrolyte capacitors produced by this process and the use of such electrolyte capacitors.
    Type: Grant
    Filed: September 13, 2006
    Date of Patent: November 15, 2011
    Assignee: H. C. Starck GmbH
    Inventors: Udo Merker, Wilfried Lövenich, Klaus Wussow, Ralph Tillmann
  • Patent number: 8052956
    Abstract: Process for the production of a powdered spherical tungstic acid by acidification of an aqueous alkaline tungstate solution with mineral acid at elevated temperature, preferably in a continuous stirred tank or a cascade of at least 2 continuous stirred tanks, and tungstic acid obtainable in this way, which is characterized by a high bulk density and spherical morphology.
    Type: Grant
    Filed: April 28, 2005
    Date of Patent: November 8, 2011
    Assignee: H. C. Starck GmbH
    Inventors: Sven Albrecht, Armin Olbrich, Michael Reiss, Frank Schrumpf, Juliane Meese-Marktscheffel, Uwe Kutzler
  • Patent number: 8029762
    Abstract: Porous anode bodies suitable for use in solid state capacitors, the porous anode bodies prepared by processes which include providing a niobium suboxide powder comprising niobium suboxide particles having a bulk nitrogen content of 500 to 20,000 ppm, and agglomerating and coalescing the powder; and capacitors incorporating such anode bodies.
    Type: Grant
    Filed: June 1, 2006
    Date of Patent: October 4, 2011
    Assignee: H. C. Starck GmbH
    Inventors: Christoph Schnitter, Holger Brumm, Christine Rawohl, Colin McCracken