Patents Assigned to H.C. Starck Ltd.
  • METHOD FOR PRODUCTION OF NIOBIUM AND TANTALUM POWDER
    Publication number: 20110067527
    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 vapour 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: Application
    Filed: October 22, 2010
    Publication date: March 24, 2011
    Applicants: H. C. Starck GmbH, H. C. Starck Ltd.
    Inventors: Helmut HAAS, Ulrich BARTMANN, Tadashi KOMEYA, Nobuyuki SATO
  • REFRACTORY METAL TOOL FOR FRICTION STIR WELDING COMPRISING A SHOULDER MADE OF TUNGSTEN, MOLYBDENUM, TANTALUM, NIOBIUM OR HAFNIUM ALLOY AND A COATED OR TREATED SURFACE
    Publication number: 20100279146
    Abstract: A tool for friction stir welding or forming is provided. The tool comprises a shoulder portion (40b) and optionally a pin portion (5Ob)l the shoulder portion (40b) comprised of at least 60% by weight and up to 100% by weight of tungsten, molybdenum, tantalum, niobium or hafnium, the balance being alloying materials, if used. The tool has at least one surface treatment or coating. Articles welded by the tools are also provided.
    Type: Application
    Filed: August 15, 2007
    Publication date: November 4, 2010
    Applicant: H.C. Starck Ltd.
    Inventors: Charles E.D. Rowe, Jonathan R. Tuck, David George Staines, Wayne Morris Thomas
  • Method for the production of niobium and tantalum powder
    Patent number: 7824463
    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: April 9, 2005
    Date of Patent: November 2, 2010
    Assignees: H. C. Starck GmbH, H.C. Starck Ltd.
    Inventors: Helmut Haas, Ulrich Bartmann, Tadashi Komeya, Nobuyuki Sato
  • Method for the Production of Niobium and Tantalum Powder
    Publication number: 20070227305
    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 vapour 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: Application
    Filed: April 9, 2005
    Publication date: October 4, 2007
    Applicants: H. C. Starck GmbH & Co. KG, H. C. Starck Ltd.
    Inventors: Helmut Haas, Ulrich Bartmann, Tadashi Komeya, Nobuyuki Sato