Abstract: The invention relates to a process for the production of electrolyte capacitors having a low equivalent series resistance and low residual current, and which comprise a solid electrolyte of conductive polymers and an outer layer comprising conductive polymers applied in the form of a dispersion. Electrolyte capacitors produced by this process and the use of such electrolyte capacitors are also provided.
Type:
Grant
Filed:
April 10, 2006
Date of Patent:
May 27, 2008
Assignee:
H.C. Starck GmbH
Inventors:
Udo Merker, Klaus Wussow, Friedrich Jonas
Abstract: A process for recovery of valuable metals from superalloys by electrochemical decomposition is described, both electrodes being formed by the superalloy and the polarity of the electrolysis current being reversed with a frequency of from 0.005 to 5 Hz.
Type:
Application
Filed:
June 21, 2007
Publication date:
May 15, 2008
Applicant:
H.C. Starck GmbH
Inventors:
Viktor Stoller, Armin Olbrich, Juliane Meese-Marktscheffel, Wolfgang Mathy, Michael Erb, Georg Nietfeld, Gerhard Gille
Abstract: The invention relates to a method that involves (a) removing graphite from at least one surface of a metal graphite composite material; (b) chemically cleaning or plasma etching the surface of the metal graphite composite material; (c) applying a metal-containing material to the surface of the chemically cleaned or plasma etched metal graphite composite material, and thereby forming an intermediate layer; (d) applying a metal coating on the intermediate layer, and thereby forming a composite material. The invention also relates to a composite material comprising (a) a metal graphite composite substrate having at least one surface that is substantially free of graphite; (b) a metal-containing intermediate layer located on a surface of the substrate; and (c) a metal coating on the intermediate layer.
Type:
Grant
Filed:
January 14, 2004
Date of Patent:
May 6, 2008
Assignees:
H.C. Starck Inc., Metal Matrix Cast Composites, Inc.
Inventors:
Richard Wu, James Cornie, Stephen Cornie, Hank Breit, Larry Ballard, Richard Malen, Prabhat Kumar, John Shields, Robert Desberg
Abstract: A substrate for semiconductor and integrated circuit components including: a core plate containing a Group VIB metal from the periodic table of the elements and/or an anisotropic material, having a first major surface and a second major surface and a plurality of openings extending, at least partially, from the first major surface to the second major surface; and a Group IB metal from the periodic table of the elements or other high thermally conductive material filling at least a portion of the space encompassed by at least some of the openings; and optionally, a layer containing a Group IB metal from the periodic table or other high thermally conductive material disposed over at least a portion of the first major surface and at least a portion of the second major surface.
Type:
Application
Filed:
October 27, 2005
Publication date:
May 1, 2008
Applicant:
H.C. Starck Inc.
Inventors:
Henry F. Breit, Rong-Chen R. Wu, Prabhat Kumar
Abstract: A tantalum powder consisting of agglomerated primary particle with a minimum primary particle dimension of 0.2 to 0.8 ?m, a specific surface area of 0.9 to 2.5 m2/g and a particle size distribution determined to ASTM B 822 corresponding to a D10 value of 5 to 25 ?m, a D50 value of 20 to 140 ?m and a D90 value of 40 to 250 ?m, wherein the powder does not comprise an effective content of sintering protection agents.
Abstract: The invention relates to the production of valve metal powders, in particular, tantalum powders by reduction of a corresponding valve metal compound, for example, K2TaF7, with an alkali metal in the presence of a diluent salt, whereby the reduction is carried out in the presence of a particle diminution agent, preferably, Na2SO4, which is added to the reaction mixture continuously or in aliquots.
Abstract: Multifunctional 3,4-alkylenedioxythiophene derivatives represented by formula (I) are described, In formula (I), n and m each independently of each other, and independently for each o, are an integer from 1 to 5, and o is 3 or 4. The groups R1, R2, R3 and R4 are independently of each other and independently for each o, selected from, for example, hydrogen, halogen and optionally substituted linear or branched C1-C20-alkyl. The group R— of formula (I) may be, independently for each o, hydrogen or a thiophene represented by the following formula (II), in which m, n, R1, R2, R3 and R4 are as described in formula (I). The group X— of formula (I) is a polyvalent linking unit (e.g., a triphenylamine radical). Also described are electrically conductive oligomers and polymers comprising the multifunctional 3,4-alkylenedioxythiophene derivatives of the present invention as a repeating or crosslinking unit.
Abstract: A method of producing a refractory metal powder by (A) combining (i) an oxide particle component and (ii) a reducing agent; (B) forming a substantially uniform mixture of (i) and (ii); (C) continuously feeding the mixture into a furnace; (D) igniting the mixture at a reaction zone and starting a reaction that is sufficiently exothermic to form a high temperature flash; (E) starting a reaction that is sufficiently exothermic to form a high temperature self-sustaining flash; and (F) producing a free-flowing reduced oxide powder.
Type:
Grant
Filed:
June 21, 2004
Date of Patent:
April 8, 2008
Assignee:
H.C. Starck Inc.
Inventors:
Leonid Natan Shekhter, Edward V. McCormick, Leah F. Simkins, Edward K. Schiele
Abstract: Methods comprising: (a) providing a silica sol having a BET surface area of 15 to 1000 m2/g and a solids content of up to 45% by weight of silicon dioxide, based on the silica sol; (b) mixing the silica sol and an anionic polyether carboxylate to form a mixture, wherein the anionic polyether carboxylate is mixed with the silica sol in an amount of 0.01 to 10% by weight, based on the mixture; and (c) concentrating the mixture to form a concentrated mixture having a solids content of 20 to 70% by weight of silicon dioxide, based on the concentrated mixture; and the concentrated sols prepared thereby.
Abstract: Electrolyte capacitors containing certain polythiophenes are described. More particularly, the polythiophenes have backbones containing repeating units of the following general formula (I) and/or repeating units of the following general formula (II), wherein A is, for example, a C1-C5-alkylene radical, R is, for example, a C1-C18-alkyl radical, and x is an integer from 0 to 8. Also described are dispersions comprising such polythiophenes, and the use of such polythiophenes or dispersions thereof for producing conductive layers.
Type:
Grant
Filed:
July 12, 2004
Date of Patent:
March 11, 2008
Assignee:
H.C. Starck GmbH
Inventors:
Knud Reuter, Udo Merker, Friedrich Jonas
Abstract: A method is described for preparing a niobium suboxide represented by the formula, NbOx, in which 0.7<x<1.3. The method involves reacting NbOy (in which y<1.8<2.1) with a stoichiometric amount of niobium metal, in the presence of hydrogen. The niobium suboxide produced by such method may be used to fabricate anodes for solid electrolyte capacitors.
Abstract: Deoxidation of valve metal powders, in particular of niobium powders, tantalum powders or their alloys, by treating the valve metal powder with calcium, barium, lanthanum, yttrium or cerium as deoxidising agent, and valve metal powders that are distinguished by a ratio of the sum of the contents of sodium, potassium and magnesium to the capacitance of less than 3 ppm/10,000 ?FV/g.
Abstract: Aqueous polymeric dispersions comprising a mixture of: (a) a component selected from the group consisting of polyvinylacetates, polyvinylacetate copolymers, and combinations thereof; and (b) SiO2 particles having an average particle diameter of 1 to 400 nm; their use as adhesives and coatings; processes for preparing such dispersions; and substrates coated and/or adhered therewith.
Type:
Application
Filed:
May 10, 2007
Publication date:
December 20, 2007
Applicant:
H.C. Starck GmbH & Co. KG
Inventors:
Dietrich Pantke, Stephan Kirchmeyer, Rudiger Musch, Knud Panskus
Abstract: The invention relates to a process for producing a molding, characterized in that a silicatic solid is mixed with a solution comprising a first silicatic binder and the mixture is then press-molded, and the compression molding is then post-treated with a solution comprising a second silicatic binder, and to silicatic moldings obtainable by this process, and also to their use as construction material, insulator material, gasket material or fire-resistant material.
Type:
Grant
Filed:
March 30, 2004
Date of Patent:
November 20, 2007
Assignee:
H.C. Starck GmbH
Inventors:
Dietrich Pantke, Peter-Nikolaus Schmitz, Hartmut Melzer
Abstract: The invention relates to a method for dispersing and passivating particulate powders in water and aqueous media. It is particularly advantageously applicable in the handling and processing of non-oxidic powders, e.g., in the ceramic and hard-metal industry. In the method claimed auxiliaries are added due to the process. According to the invention this method is characterized in that polyvinylamines and/or the initial products thereof are used as these auxiliaries.
Type:
Application
Filed:
April 13, 2005
Publication date:
November 8, 2007
Applicants:
FRAUNHOFER-GESELLSCHAFT ZUR FOEDERUNG DER ANGEWAND TEN FORSCHUNG E .V., G.U.S. BETEILIGUNGS GMBH, WOLFRAM BERGBAU – UND HUETTEN-GMBH NFG. KG, H.C. STARCK GMBH, KENNAMETAL GMBH & CO. KG, WERKZEUGE + HARTSTOFFE, KENNAMETAL WIDIA GMBH & CO. KG, GUEHRING OHG, HARTMETALL AG, CERATIZIT S.A.
Inventors:
Gottfried Boden, Sven Thiele, Manfred Nebelung
Abstract: The present invention relates to a process for preparing compounds of the formula (I), where n is an integer from 2 to 5, R1 is H or a C1-C20-alkyl group which may be interrupted by one or more O or S atoms, silylene, phosphonoyl or phosphoryl groups and Ar is substituted or unsubstituted 1,4-phenylene, 2,7-fluorene or 2,5-thiophene, with Ar being able to be identical or different, semiconductive layers comprising these compounds and their use in semiconductor technology.
Abstract: Process for the production of electrolytic capacitors with low equivalent series resistance and low residual current, having a solid electrolyte formed from conducting polymers and an outer layer containing conducting polymers and a binder, electrolytic capacitors produced by the process and their use.
Abstract: The present invention relates to calix[4]arenes which effectively bind alkali metal ions (Na+, K+) and transport them over phase boundaries, their preparation and use.
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 characterised by a high bulk density and spherical morphology.
Type:
Application
Filed:
April 28, 2005
Publication date:
September 27, 2007
Applicant:
H.C. Starck GmbH & Co. KG
Inventors:
Sven Albrecht, Armin Olbrich, Michael Reib, Frank Schrumpf, Juliane Meese-Marktscheffel, Uwe Kutzler
Abstract: The present invention is directed to bearings produced from a silicon nitride material. The silicon nitride material consists of a sintering aid selected from the group consisting of Al2O3 and Y2O3, silicon dioxide, and optionally, up to 10 mole %, based on the amount of silicon nitride, of an additive that reacts with silicon nitride, said additive selected from the group consisting of TiO2, WO3, MoO3 and mixtures thereof.
Type:
Grant
Filed:
October 19, 2006
Date of Patent:
July 17, 2007
Assignee:
H.C. Starck Ceramics GmbH & Co. KG
Inventors:
Gerhard Wötting, Mathias Herrmann, Grit Michael, Stefan Siegel, Lutz Frassek