Patents Assigned to H. C. Starck GmbH
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Patent number: 8951328Abstract: 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.Type: GrantFiled: December 9, 2004Date of Patent: February 10, 2015Assignee: H.C. Starck GmbHInventors: Josua Löffelholz, Frank Behrens, Siegfried Schmieder
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Patent number: 8883250Abstract: In various embodiments, a sputtering target initially formed by ingot metallurgy or powder metallurgy and comprising a sputtering-target material is provided, the sputtering-target material (i) comprising a metal, (ii) defining a recessed furrow therein, and (iii) having a first grain size and a first crystalline microstructure. A powder is spray-deposited within the furrow to form a layer therein, the layer (i) comprising the metal, (ii) having a second grain size finer than the first grain size, and (iii) having a second crystalline microstructure more random than the first crystalline microstructure. Spray-depositing the powder within the furrow forms a distinct boundary line between the layer and the sputtering-target material.Type: GrantFiled: June 18, 2013Date of Patent: November 11, 2014Assignees: H.C. Starck Inc., H.C. Starck GmbHInventors: Steven A. Miller, Prabhat Kumar, Rong-chein Richard Wu, Shuwei Sun, Stefan Zimmermann, Olaf Schmidt-Park
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Publication number: 20140322064Abstract: 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: ApplicationFiled: October 26, 2012Publication date: October 30, 2014Applicant: H.C. STARCK GMBHInventors: Christian Gerk, Markus Zumdick
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Publication number: 20140302338Abstract: A valve metal powder having a particle shape factor mean value f, as determined by SEM image analysis, of 0.65?f?1, said powder has an average agglomerate particle size D50 value, as determined with a MasterSizer in accordance with ASTM B 822, of 40 to 200 ?m and wherein the valve metal powder is niobium.Type: ApplicationFiled: April 3, 2014Publication date: October 9, 2014Applicant: H.C. Starck GmbHInventors: Josua Löffelholz, Jürgen Hilpert
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Patent number: 8840861Abstract: 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: GrantFiled: January 14, 2011Date of Patent: September 23, 2014Assignee: H. C. Starck GmbHInventors: Rolf Wagner, Manuel Matussek
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Patent number: 8815983Abstract: 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: GrantFiled: April 4, 2011Date of Patent: August 26, 2014Assignee: H. C. Starck GmbHInventors: Christian Gerk, Ulf Waag
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Publication number: 20140234548Abstract: 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: ApplicationFiled: September 4, 2012Publication date: August 21, 2014Applicant: H.C. STARCK GMBHInventors: Stefan Zimmermann, Benno Gries
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Patent number: 8802191Abstract: 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: GrantFiled: April 28, 2006Date of Patent: August 12, 2014Assignee: H. C. Starck GmbHInventors: Stefan Zimmermann, Uwe Papp, Heinrich Kreye, Tobias Schmidt
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Patent number: 8801829Abstract: 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: GrantFiled: October 22, 2010Date of Patent: August 12, 2014Assignee: H. C. Starck GmbH & Co. KGInventors: Helmut Haas, Ulrich Bartmann, Tadashi Komeya, Nobuyuki Sato
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Patent number: 8790607Abstract: 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: GrantFiled: August 28, 2009Date of Patent: July 29, 2014Assignee: H. C. Starck GmbHInventor: Friedrich Wilhelm Karau
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Publication number: 20140185190Abstract: A process for producing an anode for an electrolytic capacitor includes pressing a tantalum powder around a tantalum wire, a tantalum ribbon, or a tantalum sheet to form a pressed body. The pressed body is sintered to form a porous sintered body. The porous sintered body is cooled to form a cooled porous sintered body. The cooled porous sintered body is treated with at least one oxidant comprising at least one of a gaseous oxidant and a liquid oxidant to form a treated sintered body. The treated sintered body is anodically oxidized in an electrolyte to form a dielectric layer.Type: ApplicationFiled: August 8, 2012Publication date: July 3, 2014Applicant: H.C. STARCK GMBHInventors: Helmut Haas, Marcel Hagymasi, Holger Brumm, Christoph Schnitter
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Patent number: 8747488Abstract: 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: GrantFiled: December 7, 2009Date of Patent: June 10, 2014Assignee: H. C. Starck GmbHInventors: Ralph Otterstedt, Marianne Gottschling
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Publication number: 20140138586Abstract: A mixed oxide catalyst includes a support material selected from the group comprising aluminum oxide, magnesium oxide, titanium oxide, and mixtures of aluminum oxide, magnesium oxide, and titanium oxide, and a catalyst active component comprising cobalt oxide and molybdenum oxide. The catalyst active component is nanodispersed in the support material.Type: ApplicationFiled: June 13, 2012Publication date: May 22, 2014Applicant: H.C. STARCK GMBHInventors: Juliane Meese-Marktscheffel, Armin Olbrich, Matthias Jahn, Stefan Vodegel, Christoph Immisch
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Publication number: 20140086782Abstract: 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: ApplicationFiled: May 24, 2012Publication date: March 27, 2014Applicant: H.C. STARCK GMBHInventor: Benno Gries
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Patent number: 8623112Abstract: Processes comprising: melting a mixture comprising a valve metal precursor and a diluting agent in at least one first vessel under a first set of temperature and residence time conditions; transferring the mixture to at least one second vessel; and initiating, in the at least one second vessel, a reaction of the valve metal precursor to form a valve metal under a second set of temperature and residence time conditions; valve metal powder prepared thereby and uses therefor.Type: GrantFiled: September 7, 2006Date of Patent: January 7, 2014Assignee: H.C. Starck GmbHInventors: Josua Löffelholz, Jürgen Hilpert
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Publication number: 20130306902Abstract: A process for producing a homogenous multi compound system which is hydroxide- and/or oxide-based includes a first alternative process comprising providing a first and a second refractory metal in respective hydrofluoric solutions, and mixing the first and second hydrofluoric solutions to provide a mixed hydrofluoric solution comprising a dissolved first and second refractory metal. A second alternative process comprises dissolving the first and the second refractory metal in an alternative mixed hydrofluoric solution. The mixed hydrofluoric solution or the alternative mixed hydrofluoric solution is precipitated with a precipitant to provide a solids mixture in a suspension. The first and second refractory metal is from the group consisting of Mo, W, Nb, Re, Zr, Hf, V, Sb, Si, Al, and Ta. The first and second refractory metal are different. At least one of the first and second refractory metal is provided as a fluoro and/or as an oxyfluoro complex.Type: ApplicationFiled: February 3, 2012Publication date: November 21, 2013Applicant: H.C. STARCK GMBHInventors: Karsten Beck, Sven Albrecht, Christoph Schnitter, Timo Langetepe, Ralph Otterstedt
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Patent number: 8545794Abstract: The invention relates to a powder compound of the formula NiaMbOx(OH)y, wherein M represents Co and at least one element selected from the group consisting of Fe, Zn, Al, Sr, Mg, or Ca and mixtures thereof, or M represents Co Mn and Fe, wherein 0.6?a<1.0, 0<b?0.4, 0<x?0.60, and 1.4?y<2, wherein the powder compound has a particle size distribution d50 value, measured in accordance with ASTM B 822, of <5 ?m, and wherein a ratio of tap density, measured in accordance with ASTM B 527, to the particle size distribution d50 value is at least 0.4 g/cm3. The invention also relates to a process for preparing the compound and its uses.Type: GrantFiled: September 2, 2008Date of Patent: October 1, 2013Assignee: H.C. Starck GmbHInventors: Matthias Jahn, Gerd Malkowske, Stefan Malcus, Juliane Meese-Marktscheffel, Armin Olbrich, Rüdiger Zertani
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Patent number: 8523976Abstract: The present invention relates to a metal powder mixture that is suitable for producing sintered bodies. The powder mixture is suitable as a binder for hard metals and contains: a) at least one prealloyed powder selected from the group of iron/nickel, iron/cobalt, iron/nickel/cobalt and nickel/cobalt; b) at least one element powder selected from the group of iron, nickel and cobalt or a prealloyed powder selected from the group consisting of iron/nickel, iron/cobalt, iron/nickel/cobalt and nickel/cobalt which is different from component a). The invention also relates to a cemented hard material which uses the inventive powder mixture and a hard material powder, wherein the overall composition of the components a) and b) together contains not more than 90% by weight of cobalt and not more than 70% by weight of nickel and the iron content.Type: GrantFiled: September 21, 2007Date of Patent: September 3, 2013Assignee: H.C. Starck GmbHInventors: Benno Gries, Leo Prakash
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Patent number: 8454931Abstract: 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: GrantFiled: September 23, 2011Date of Patent: June 4, 2013Assignee: H.C. Starck GmbHInventors: Sven Albrecht, Armin Olbrich, Michael Reiβ, Frank Schrumpf, Juliane Meese-Marktscheffel, Uwe Kutzler
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Patent number: 8449855Abstract: The invention is related to a boride of a metal of transition group four of the periodic table of the elements, wherein at least 40 wt. % of the particles have a grain size of more than 106 ?m, determined by sieve analysis according to ASTM B 214, and these particles consist of grown, monocrystalline grains. The invention also relates to a cermet, wettable powder and a surface coating which contain the boride. The invention further relates to a process to prepare the boride. The invention additionally relates to a process to prepare a cermet or a wettable powder.Type: GrantFiled: February 18, 2011Date of Patent: May 28, 2013Assignee: H.C. Starck GmbH & Co. KGInventors: Frank Schrumpf, Wolfgang Kiliani, Stefan Frässle, Thomas Schmidt