Mixture Contains Particles Of Nonmetal Patents (Class 75/252)
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Patent number: 6605129Abstract: The present invention relates to a powdered niobium for a capacitor having a good specific leakage current value, a sintered body using the powdered niobium, a capacitor using the sintered body and production method of the capacitor. A powdered niobium for a capacitor, characterized in that the content of each of the elements such as iron, nickel, cobalt, silicon, sodium, potassium and magnesium is about 100 ppm by weight or less and/or the total content thereof is about 350 ppm by weight or less is used. A niobium sintered body or a capacitor is constructed using the powdered niobium. A niobium sintered body for a capacitor, comprises at least one of niobium monoxide crystal and a diniobium mononitride crystal.Type: GrantFiled: February 25, 2000Date of Patent: August 12, 2003Assignee: Showa Denko Kabushiki KaishaInventor: Kazumi Naito
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Publication number: 20030145680Abstract: An ultrafine metal powder slurry with high dispersibility includes an organic solvent; a surfactant having a hydrophilic group and a lipophilic group; and an ultrafine metal powder in an amount more than 60% by mass and less than 95% by mass. In the slurry, the hydrophilic group of the surfactant is at least one selected from a sulfonato group, sulfo group, sulfonyldioxy group, polyoxyethylene group with carboxyl group, and polyoxyethylene group with phosphate group, and the lipophilic group is an alkyl containing 12 or more carbon atoms or an alkylphenyl. The ultrafine metal powder slurry includes no aggregated particles, exhibits good dispersibility and is useful as a metal material for conductive pastes. The slurry can save a part of process steps in conventional conductive paste production processes, can shorten a process time and can save in labor.Type: ApplicationFiled: December 13, 2002Publication date: August 7, 2003Applicant: KAWATETSU MINING CO., LTD.Inventor: Morishige Uchida
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Patent number: 6602315Abstract: Improved methods for coating particulate materials at low shear conditions and preferably below the melting point of the coating material are provided. In one aspect, metallurgical compositions are provided that contain a metal-based powder bound to an alloying powder or powders by way of a low melting polymer or wax binding agent, which is preferably polyethylene. The binding agent is blended with the metal-based and alloying powders at elevated temperatures preferably below the melting point of the binding agent. The bonded metallurgical composition can be used in compaction processes to manufacture compacted parts that can be sintered to impart strength.Type: GrantFiled: July 20, 2001Date of Patent: August 5, 2003Assignees: Hoeganaes Corporation, Ameka, Inc.Inventors: William Hendrickson, Sydney Luk
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Publication number: 20030140730Abstract: The present invention relates to improved metallurgical powder compositions that incorporate solid lubricants, methods for preparing and using the same, and methods of making compacted parts. Ejection properties, such as stripping pressure and sliding pressure, of compacted parts can be improved by using the solid lubricants. The solid lubricants contain functionalized polyalkylene lubricants have the formula: R1—Q—R2 where Q is a linear or branched, polyalkylene containing from about 10 to about 200 carbon atoms, and R1 and R2 are each independently a hydroxyl group, a carboxylic acid group or a metal salt thereof, an amine group, a mono- or di-C1 to C25 alkyl substituted amine group, or an alkylene oxide group having the formula: —[(CH2)qO]nH where q is from about 1 to about 7, n is from about 1 to about 100.Type: ApplicationFiled: January 25, 2002Publication date: July 31, 2003Inventors: Sydney Luk, George Poszmik
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Patent number: 6599345Abstract: A powder metal blend for making a powder metal part especially a valve guide 14 for an internal combustion engine particularly suited for operation where there is little or no engine oil lubricant at the valve stem 30 and valve guide 14 interface. The powder metal blend having a chemical composition on a weight percent basis of about 2 to about 10 percent copper; about 0.5 to about 5.0 percent solid lubricant; about 1.0 to about 3.0 percent graphite; about 1.0 to about 8.0 percent bronze; about 0.2 to about 1.5 percent copper-and/or iron phosphorus; about 0.3 to about 1.0 percent fugitive lubricant; and the balance being a low alloy steel powder containing about 0.3 to about 1.0 percent manganese.Type: GrantFiled: October 2, 2001Date of Patent: July 29, 2003Assignee: Eaton CorporationInventors: Yushu Wang, Sundaram L. Narasimhan, Heron A. Rodrigues
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Publication number: 20030110887Abstract: A powder for metal injection molding of has a silicon content of less than 0.1%. Silica inclusions are substantially eliminated in the finished molded product.Type: ApplicationFiled: December 19, 2001Publication date: June 19, 2003Applicant: Honeywell International Inc.Inventors: Kenneth J. Bartone, Santosh K. Das
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Patent number: 6578539Abstract: A surface layer for forming a cylinder barrel wall of a combustion engine block is proposed. The surface layer has separate phases of components that are separated from the phase of the remaining materials. The surface layer is produced by plasma spraying an iron containing spraying powder, incorporating all components of the layer to be produced. Such a surface layer may be applied easily and shows a significantly improved behavior regarding the machining thereof, without negatively influencing other important characteristics of the layer material, like wear resistance and coefficient of friction vis-à-vis the material of the piston rings. Preferred components of the spraying powder are, besides Fe, Cr, MN, S and C. Moreover, the spraying powder can contain As, Te, Se, Sb and/or Bi.Type: GrantFiled: May 15, 2001Date of Patent: June 17, 2003Assignee: Sulzer Metco AGInventor: Gérard Barbezat
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Patent number: 6573225Abstract: The invention concerns a metal powder composition for warm compaction comprising an iron-based powder and lubricant powder consisting of a polycarboxylic acid amide wax having a melting point peak in the range of 180° to 210° C.Type: GrantFiled: February 19, 2002Date of Patent: June 3, 2003Assignee: Höganäs ABInventors: Hilmar Vidarsson, Sigurd Berg
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Patent number: 6572670Abstract: A composition for forming metal objects includes (a) first particles containing a jewelry-metal, and (b) second particles containing a refractory metal oxide. The composition allows the preparation of jewelry-metal in a large variety of colors.Type: GrantFiled: November 14, 2000Date of Patent: June 3, 2003Assignee: Board of Trustees of University of IllinoisInventors: Billie Jean Theide, Rimas T. VisGirda
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Publication number: 20030098090Abstract: The invention concerns a nickel based powdered metallic material comprising in addition to nickel 0-4.5 wt % of copper, 0-5.0% by weight of iron, whereby the total amount of copper and iron is at least 2.5% by weight, 0.05-5.0% by weight of a carbide forming element 0.5-2.0% by weight of boron, 1.0-4.0% by weight of silicon, 0.5-4.0% by weight of phosphorus, 0.01-0.5% by weight of C and less than 2% by weight of inevitable impurities.Type: ApplicationFiled: November 20, 2001Publication date: May 29, 2003Inventors: Hans Hallen, Lars Ake Nilsson
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Publication number: 20030094075Abstract: A powder composition for warm compaction comprising an iron-based powder and a lubricant powder consisting essentially of an amide described by the following formula D-Cm-B-A-B-Cm-D wherein D is —H, COR, CNHR, wherein R is a straight or branched aliphatic or aromatic group including 2-21 C atoms; C is the group —NH (CH)n CO—; B is amino or carbonyl; A is alkylene having 4-16 C atoms optionally including up to 4 O atoms m is an integer 1-10 and n is an integer 5-11.Type: ApplicationFiled: July 25, 2002Publication date: May 22, 2003Inventors: Hilmar Vidarsson, Per Knutsson
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Publication number: 20030094076Abstract: This invention aims at providing a method of obtaining fine alloy powders, which are extremely small in particle size, high in purity, and uniform in composition, providing fine alloy powders obtained by this method, and providing molding materials, slurries, and electromagnetic shielding materials, which use these fine alloy powders. This invention provides a fine alloy powder production method, which is characterized in that after performing the process of mixing at least a trivalent titanium compound and a complexing agent, which binds with the trivalent titanium ion, in an aqueous solution containing two or more types of metal ion, the two or more types of metal are made to deposit simultaneously.Type: ApplicationFiled: January 13, 2003Publication date: May 22, 2003Applicant: Sumitomo Electric Industries, Ltd.Inventors: Akihisa Hosoe, Shinji Inazawa, Masatoshi Majima, Katsuya Yamada, Hiroshi Okazaki, Souji Nishikawa, Toshio Shimotsuji
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Patent number: 6565621Abstract: An adhesive composition is provided for bonding two or more different members which can give a bonded material having excellent heat resistance characteristics while inhibiting breakage of the materials to be bonded by reducing the expansion coefficient, the Young's modulus and the proof stress value. A method for bonding two or more different members using the adhesive composition, and a composite member comprising two or more different members bonded by the above method can be provided by the adhesive composition which comprises a hard solder and a mixture of at least two fine particle materials differing in wettability with the hard solder and which is controlled in expansion coefficient, Young's modulus and proof stress value.Type: GrantFiled: June 24, 2002Date of Patent: May 20, 2003Assignee: NGK Insulators, Ltd.Inventors: Masayuki Shinkai, Masahiro Kida
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Publication number: 20030084753Abstract: Disclosed is a rapidly expanding metallic mixture treated for oxidation prevention thereof at room temperature, comprising a metal salt and a metal powder, which prevents its spontaneous explosion due to oxidation of the metal powder in the mixture at room temperature during storage, or dysfunction of the mixture upon blasting work because of altered mixing ratios between the metal salt and the metal powder. The rapidly expanding metallic mixture is characterized in that the mixture is added with a water repellent such as oil or an inorganic preservative, or is coated with a resin and formed to the size of 0.1-100 mm3.Type: ApplicationFiled: October 24, 2002Publication date: May 8, 2003Inventor: Chang Sun Kim
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Patent number: 6558448Abstract: The method of the invention is based on the unique electron-carrying function of a photocatalytic unit such as the photosynthesis system I (PSI) reaction center of the protein-chlorophyll complex isolated from chloroplasts. The method employs a photo-biomolecular metal deposition technique for precisely controlled nucleation and growth of metallic clusters/particles, e.g., platinum, palladium, and their alloys, etc., as well as for thin-film formation above the surface of a solid substrate. The photochemically mediated technique offers numerous advantages over traditional deposition methods including quantitative atom deposition control, high energy efficiency, and mild operating condition requirements.Type: GrantFiled: December 8, 2000Date of Patent: May 6, 2003Assignee: UT-Battelle, LLCInventor: Zhong-Cheng Hu
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Patent number: 6558447Abstract: Metal powder Ta and/or Nb, with or without one or metals from the group Ta, Nb, Ti, Mo, W, V, Zr and Hf, is made in a fine powder form by reduction of metal oxide by contact with a gaseous reducing agent, preferably an alkaline earth metal, to near complete reduction, leaching, further deoxidation and agglomeration, the powder so produced being sinterable to capacitor anode form and processable to other usages.Type: GrantFiled: March 16, 2001Date of Patent: May 6, 2003Assignee: H.C. Starck, Inc.Inventors: Leonid N. Shekhter, Terrance B. Tripp, Leonid L. Lanin, Karlheinz Reichert, Oliver Thomas, Joachim Vieregge
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Patent number: 6554884Abstract: A process for producing sintered pellets made from blends of refractory metal and refractory metal nitride powders were found to have a higher fraction of intra-agglomerate pores than those made from the refractory metal or refractory metal nitride alone resulting in improved capacitor grade powders, anodes and finished capacitors therefrom. The pellet porosity and total intrusion volume maximizes when the mixture is in the 50-75 W/W % refractory metal nitride range. The total pellet pore surface area was found to be relatively independent of refractory metal nitride concentration above 50%. A substrate consisting of a 50/50 or 25/75 W/W % refractory metal/refractory metal nitride powder mixture should produce solid capacitors with higher capacitance recovery and lower ESR.Type: GrantFiled: October 24, 2000Date of Patent: April 29, 2003Assignee: H.C. Starck, Inc.Inventors: Terrance B. Tripp, Barbara L. Cox
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Publication number: 20030075016Abstract: In order to improve machinability of a sintered compact, a phosphate compound of an alkali earth metal (calcium phosphate compound or the like) is mixed with an iron-based powder, or an alkali earth metal fluoride (calcium fluoride, or the like) is further mixed with the iron-based powder. Alternatively, the alkali earth metal fluoride, together with a graphite powder, is preferably fixed to recesses of the iron-based powder.Type: ApplicationFiled: February 21, 2002Publication date: April 24, 2003Applicant: Kawasaki Steel CorporationInventors: Satoshi Uenosono, Junichi Ohta, Akio Sonobe
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Publication number: 20030075018Abstract: The invention relates to a process for the production of metallic and metal-ceramic composite components by powder injection molding of a system comprising a metal composite powder, a binder and optionally a ceramic component, where the metal composite powder used is mixed with a protecting liquid in an inert atmosphere before the mixing with the binder. The invention furthermore relates to molybdenum/copper and tungsten/copper composite powders which have a primary metal particle size of predominantly <2 &mgr;m, an oxygen content of <0.8% by weight and optionally a ceramic component, to the use of these composite powders for the production of composite components by powder injection molding, and to a process for the preparation of composite powders in which oxides of molybdenum or tungsten and of copper are mixed, dry-ground and reduced using hydrogen at a temperature of from 800 to 1050° C., and a ceramic component is optionally admixed with the resultant metal composite powder.Type: ApplicationFiled: November 21, 2002Publication date: April 24, 2003Inventors: Helmut Meinhardt, Bernd Meyer, Matthias Knuwer, Dietmar Fister, Wolfgang Wiezoreck
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Publication number: 20030075017Abstract: The invention concerns a method of preparing an iron-based powder comprising the steps of mixing and heating an iron-based powder, at least one oligomer amide type lubricant, at least one fatty acid and optionally one or more additives to a temperature above the melting point of the lubricant and subsequently cooling the obtained mixture. The invention also comprises the mixture of the iron-based powder, the oligomer amide type lubricant and the fatty acid.Type: ApplicationFiled: July 25, 2002Publication date: April 24, 2003Inventor: Bjorn Johansson
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Patent number: 6551376Abstract: A method by which the distribution of the particulates of a plurality of metal powders, the metals of each powder being of different densities, may be uniformly disbursed within a dry mixture of the powders and by which this uniform dispersion of the different density powders can be sustained through subsequent handling and/or storage of the mixture. In accordance with one aspect of the present invention, a quantity of each of a plurality of metal powders is admixed with a dry stabilizing non-metal powder. One particularly useful non-metal powder is a micronized polymer, preferably micronized polyethylene.Type: GrantFiled: April 21, 2000Date of Patent: April 22, 2003Assignee: Doris Nebel Beal Inter Vivos Patent TrustInventor: Harold F. Beal
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Publication number: 20030061905Abstract: A powder metal blend for making a powder metal part especially a valve guide 14 for an internal combustion engine particularly suited for operation where there is little or no engine oil lubricant at the valve stem 30 and valve guide 14 interface. The powder metal blend having a chemical composition on a weight percent basis of about 2 to about 10 percent copper; about 0.5 to about 5.0 percent solid lubricant; about 1.0 to about 3.0 percent graphite; about 1.0 to about 8.0 percent bronze; about 0.2 to about 1.5 percent copper and/or iron phosphorus; about 0.3 to about 1.0 percent fugitive lubricant; and the balance being a low alloy steel powder containing about 0.3 to about 1.0 percent manganese.Type: ApplicationFiled: October 2, 2001Publication date: April 3, 2003Applicant: Eaton CorporationInventors: Yushu Wang, Sundaram L. Narasimhan, Heron A. Rodrigues
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Publication number: 20030061906Abstract: A hard metal granulate is produced by wet milling and spray drying in a spray tower using pure water as the liquid phase. The spray tower is configured and operated in such a way that a ratio of the quantity of water added via the slurry (in liters per hour) to tower volume (in m3) is between 0.5 and 1.8 and in that a maximum of 0.17 kg of slurry is atomized per m3 of incoming drying gas. The slurry has a solid particle concentration within a range of 65-85% by weight. Under these conditions, the addition of a water-soluble, long-chain polyglycol to the slurry prior to spraying previously required in order to prevent oxidation of the hard metal granulate is no longer necessary.Type: ApplicationFiled: November 22, 2002Publication date: April 3, 2003Inventors: Gerhard Knunz, Helmut Beirer, Andreas Lackner, Wolfgang Glatzle, Erwin Hartlmayr
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Patent number: 6533836Abstract: An iron-based mixed powder for use in powder metallurgy and excellent in die filling property and compressibility and without segregation, includes an iron-based powder in which alloying powder(s) is adhered to the surface by a binder and, further, a free lubricant. The iron-based powder includes a mixed iron powder of atomized iron powder and reduced iron powder.Type: GrantFiled: July 3, 2001Date of Patent: March 18, 2003Assignee: Kawasaki Steel CorporationInventors: Satoshi Uenosono, Yukiko Ozaki
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Publication number: 20030047033Abstract: A method of producing a material library of surface areas having different properties is described, in which mixtures of substances are applied to a substrate by a combinatory method so that a combinatory system is obtained. At least two suspensions are used to produce the mixtures.Type: ApplicationFiled: August 8, 2002Publication date: March 13, 2003Inventors: Gerd Scheying, Thomas Brinz
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Publication number: 20030047028Abstract: Exchangeable metal ions are removed from an amorphous composite metal oxide and different metal ions are introduced to manufacture a nanomaterial of composite metal oxide. Based on this method, it is possible to reliably form composite metal oxide nanomaterials over a wide range of compositions.Type: ApplicationFiled: August 8, 2002Publication date: March 13, 2003Inventors: Toyoki Kunitake, Izumi Ichinose, Rie Takaki, Junhui He
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Publication number: 20030035975Abstract: An adhesive composition is provided for bonding two or more different members which can give a bonded material having excellent heat resistance characteristics while inhibiting breakage of the materials to be bonded by reducing the expansion coefficient, the Young's modulus and the proof stress value. A method for bonding two or more different members using the adhesive composition, and a composite member comprising two or more different members bonded by the above method can be provided by the adhesive composition which comprises a hard solder and a mixture of at least two fine particle materials differing in wettability with the hard solder and which is controlled in expansion coefficient, Young's modulus and proof stress value.Type: ApplicationFiled: June 24, 2002Publication date: February 20, 2003Applicant: NGK Insulators, Ltd.Inventors: Masayuki Shinkai, Masahiro Kida
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Publication number: 20030033904Abstract: These connecting rods are made from prealloyed manganese, sulfur, ferrous based powder. The prealloyed powder then is mixed with copper and carbon. The copper content is at higher than normal copper contents. The resulting forged connecting rods had an improvement in tensile strength and an improvement in fatigue strength.Type: ApplicationFiled: July 31, 2001Publication date: February 20, 2003Inventor: Edmond Ilia
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Publication number: 20030029272Abstract: A powder composition for warm compaction comprising an iron-based powder and a lubricant powder consisting essentially of an amide described by the following formula D—Cm—B—A—B—Cm—D wherein D is —H, COR, CNHR, wherein R is a straight or branched aliphatic or aromatic group including 2-21 C atoms; C is the group —NH(CH)nCO—; B is amino or carbonyl; A is alkylene having 4-16 C atoms optionally including up to 4 O atoms m is an integer 1-10 and n is an integer 5-11.Type: ApplicationFiled: May 10, 2001Publication date: February 13, 2003Inventors: Hilmar Vidarsson, Per Knutsson
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Patent number: 6511945Abstract: The invention concerns new lubricants comprising a combination of a polyethylene oxide and an oligomer amide and an improved metallurgical powder composition comprising a major amount of an iron-based powder and a minor amount of this new lubricant. Furthermore, the invention concerns a method requiring low ejection force and low ejection energy for producing green products having high green strength. The method comprises the steps of mixing an iron-based powder and optional additives with the new lubricant and compacting the obtained powder composition.Type: GrantFiled: January 17, 2002Date of Patent: January 28, 2003Assignee: Höganäs ABInventor: Maria Ramstedt
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Patent number: 6503290Abstract: The invention is a corrosion resistant powder useful for deposition through thermal spray devices. The powder consists essentially of, by weight percent, 30 to 60 tungsten, 27 to 60 chromium, 1.5 to 6 carbon, a total of 10 to 40 cobalt plus nickel and incidental impurities plus melting point suppressants.Type: GrantFiled: March 1, 2002Date of Patent: January 7, 2003Assignee: Praxair S.T. Technology, Inc.Inventors: William John Crim Jarosinski, Lewis Benton Temples
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Publication number: 20020194956Abstract: A high velocity oxygen fuel thermal spray powder comprising a superalloy having the formula MCrAlY-X, wherein M is at least one metal taken from the group consisting of nickel, cobalt, and iron; X is at least one reactive element taken from the group consisting of hafnium, rhenium, lanthanum, and tantalum; and yttrium is present in levels greater than 1% by weight of the total composition and up to about 6% by weight of the total composition. In addition, the powder may be blended with an agglomeration of M′CrAlY and a ceramic, wherein M′ is at least one metal taken from the group consisting of nickel, cobalt, and iron. The invention offers improved high temperature oxidation, corrosion and creep resistance.Type: ApplicationFiled: October 5, 2001Publication date: December 26, 2002Applicant: Sulzer Metco (US) Inc.Inventors: Lysa Russo, Mitchell R. Dorfman, Kerry LaPierre
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Publication number: 20020178863Abstract: The invention concerns a method of preparing an iron-based powder comprising the steps of mixing and heating an iron-based powder, at least one oligomer amide type lubricant, at least one fatty acid and optionally one or more additives to a temperature above the melting point of the lubricant and subsequently cooling the obtained mixture. The invention also comprises the mixture of the iron-based powder, the oligomer amide type lubricant and the fatty acid.Type: ApplicationFiled: May 10, 2001Publication date: December 5, 2002Inventor: Bjorn Johansson
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Publication number: 20020152842Abstract: An object of the present invention is to provide nitrogen-containing metallic powder at high productivity, which powder contains a metal such as niobium or tantalum containing nitrogen uniformly, and enables production of an anode electrode that has high specific capacitance and low leakage current and that exhibits excellent reliability for a prolonged period of time. There is provided nitrogen-containing metallic powder which is a solid solution containing 50-20,000 ppm nitrogen, in which the metal that constitutes the metallic powder is niobium or tantalum. The nitrogen-containing metallic powder is produced through the process in which while a metallic compound is reduced with a reducing agent, a nitrogen-containing gas is introduced into a reaction system to thereby form metal, and nitrogen is simultaneously incorporated into metal.Type: ApplicationFiled: June 20, 2002Publication date: October 24, 2002Applicant: CABOT SUPERMETALS K.K.Inventors: Yukio Oda, Tomoo Izumi, Yoshikazu Noguchi
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Publication number: 20020155050Abstract: The invention provides a remediation method of soil, water and/or gases by prompt dehalogenation of halogenated hydrocarbons by allowing the halogenated hydrocarbons contained at least in one of the soil, water and/or gases to contact an iron powder containing about 0.03 to about 2% by mass of sulfur preferably on the surface, and an iron powder for use in the remediation method.Type: ApplicationFiled: November 7, 2001Publication date: October 24, 2002Inventors: Hiroki Nakamaru, Haruhiko Miyazawa, Yoshiei Kato
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Patent number: 6464751Abstract: An iron-based mixed powder for use in powder metallurgy has an apparent density of at least about 3.1 Mg/m3, is excellent in die filling property and compressibility and without segregation, and includes an iron-based powder to which alloying powder is adhered at the surface by binder and free lubricant. The iron-based powder includes an atomized iron powder, or a mixed powder of an atomized iron powder and a reduced iron powder.Type: GrantFiled: July 3, 2001Date of Patent: October 15, 2002Assignee: Kawasaki Steel CorporationInventors: Satoshi Uenosono, Yukiko Ozaki
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Publication number: 20020146341Abstract: The invention concerns a method of improving the dynamic properties of compacted and sintered products having a density between 6.8 and 7.6 g/cm3, preferably between 7.0 and 7.4 g/cm3. According to this method an iron based powder, graphite and a solid particular lubricant having a vaporizing temperature less the sintering temperature, preferably less than about 800° C. is compacted and sintered and the maximum particle size of the lubricant is selected so that the largest pores of a compacted and sintered product prepared from the composition are equal to or less than the largest pores obtained in a compacted and sintered product prepared from the composition without lubricant. The invention also concerns composition of an iron based powder, graphite and a solid particular lubricant having a vaporizing temperature less the sintering temperature, preferably less than about 800° C. and a maximum particle size less than about 0.Type: ApplicationFiled: January 24, 2001Publication date: October 10, 2002Inventors: Owe Mars, Bjorn Lindqvist, Asa Ahlin
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Method of manufacture of a powder-based firearm ammunition projectile employing electrostatic charge
Publication number: 20020134197Abstract: A first metal powder having a density greater than the density of lead is mixed with a second metal powder having a density not greater than the density of lead and a matrix micronized polymeric powder which is itself a poor electrical conductor but susceptible to accumulation of an electrostatic charge thereon during handling and/or transportation thereof. The mixing of these metal powders and the micronized polymeric powder is performed under conditions which maintain, promote or enhance the electrostatic environment within a mixing vessel with the result that the metal and nonmetal powders become substantially uniformly distributed throughout the mixture, and retain their uniform distribution after removal from the mixing vessel, and carry forward such uniform distribution into and throughout subsequent conversion of the mixture into ammunition projectiles without the heavy and light metal powder particulates separating, according to their respective densities, into semi-layers or strata.Type: ApplicationFiled: December 31, 2001Publication date: September 26, 2002Inventor: Harold F. Beal -
Patent number: 6451082Abstract: An iron-based powder composition is provided that is greatly flowable and compactible and less dependent on temperature with respect to flowability and compactibility at room temperature or during warming. The iron-based powder composition includes an iron-based powder, a lubricant melted and fixed to the iron-based powder, an alloying powder bonded to the iron-based powder with the aid of the lubricant, and a free lubricant. One or more constituent members are coated with an organosiloxane layer in a coating ratio of greater than about 80%. The organosiloxane has phenyl groups as a functional group. The lubricant melted and fixed to the iron-based powder is a composite melt composed of a calcium soap and a lithium soap, or a composite melt composed of a calcium soap and an amide lubricant. The free lubricant is a mixed powder composed of an amide lubricant and a methyl polymethacrylate powder, or a lithium soap powder. A process for producing the iron-based powder composition is also provided.Type: GrantFiled: December 28, 2000Date of Patent: September 17, 2002Assignee: Kawasaki Steel CorporationInventors: Yukiko Ozaki, Satoshi Uenosono, Kuniaki Ogura
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Publication number: 20020121156Abstract: Aqueous dispersion containing a silicon-aluminum mixed oxide powder, the powder containing 0.1 to 99.9 wt. % Al2O3 and Si—O—Al-bonds. The dispersion can be produced using dispersing and/or grinding devices which a achieve an energy input of at least 200 KJ/m3. The dispersion can be used for the chemical-mechanical polishing of semiconductor substrates.Type: ApplicationFiled: February 21, 2002Publication date: September 5, 2002Applicant: DEGUSSA AGInventors: Frank Menzel, Wolfgang Lortz, Helmut Mangold
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Patent number: 6444008Abstract: A coating formulation is described in which includes a solvent, a binder, and a metal additive comprising tantalum, niobium, alloys thereof, or mixtures thereof. Also described is a cellulose-based substrate which contains a cellulose-based reinforcing agent, a binder, and a metal additive comprising tantalum, niobium, alloys thereof, or mixtures thereof. Also described is a cement-based or plaster-based substrate containing a cement-based or plaster-based material and a metal additive comprising tantalum, niobium, alloys thereof, or mixtures thereof.Type: GrantFiled: March 19, 1999Date of Patent: September 3, 2002Assignee: Cabot CorporationInventor: James A. Fife
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Patent number: 6436166Abstract: The present invention concerns powder compositions including iron-containing powders, additives, lubricant and flow agents. The powder compositions essentially consist of iron-containing particles having additive particles bonded thereto by a molten and subsequently solidified lubricant for the formation of aggregate particles and from about 0.005 to about 2 percent by weight of a flow agent having a particle size below 200 nanometers.Type: GrantFiled: January 25, 2001Date of Patent: August 20, 2002Assignee: Höganäs ABInventors: Johan Arvidsson, Hilmar Vidarsson
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Publication number: 20020108468Abstract: An iron-based mixed powder for use in powder metallurgy has an apparent density of at least about 3.1 Mg/m3, is excellent in die filling property and compressibility and without segregation, and includes an iron-based powder to which alloying powder is adhered at the surface by binder and free lubricant. The iron-based powder includes an atomized iron powder, or a mixed powder of an atomized iron powder and a reduced iron powder.Type: ApplicationFiled: July 3, 2001Publication date: August 15, 2002Applicant: Kawasaki Steel CorporationInventor: Satoshi Uenosono
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Patent number: 6432159Abstract: A magnetic mixture comprising at least two kinds of powders which are uniformly mixed with each other. Each powder exhibits a significant magnetic property when its constituent elements have a predetermined composition ratio. Magnetic properties of each powder are retained in the magnetic mixture which exhibits, as a whole, a soft magnetic property. The magnetic mixture is useful as a raw material for a powder magnetic core.Type: GrantFiled: September 28, 2000Date of Patent: August 13, 2002Assignee: Daido Tokushuko Kabushiki KaishaInventors: Takanobu Saito, Satoshi Takemoto, Toshiaki Yashiro, Haruo Koyama, Shinichiro Yahagi
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Patent number: 6428596Abstract: A multiplex powder composite for use in a cored wire electrode to be deployed in a thermal spray or welding apparatus. The composite comprises micron-sized particles and sub-micron-sized particles, including nano-scale particles, the particles mechanically cooperating to promote smooth powder flow, which facilitates compaction of the cored wire electrode.Type: GrantFiled: November 13, 2000Date of Patent: August 6, 2002Assignee: Concept Alloys, L.L.C.Inventors: David John Urevich, Joseph Paul Hughes
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Patent number: 6423110Abstract: A powder composition for a capacitor comprising a tantalum or niobium and a compound having a silicon-oxygen bond, at least a part of which may be nitrided and which has an average particle size of from about 0.1 to about 5 &mgr;m; a sintered body using the composition; and a capacitor constituted by the sintered body as one part electrode, and another part electrode. A capacitor favored with high reliability, lower dissipation level of power and smaller deterioration of capacitance than conventional tantalum capacitors using tantalum can be produced by using a sintered body of the powder composition for a capacitor.Type: GrantFiled: October 11, 2000Date of Patent: July 23, 2002Assignee: Showa Denko K.K.Inventors: Kazumi Naito, Kazuhiro Omori, Nobuyuki Nagato
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Publication number: 20020088505Abstract: A composition of metal powder for powder metallurgy applications comprising an iron-based powder metal admixed with a minority fraction of a ferrite powder having a lesser particle-size distribution. The ferrite particles are associated with an exterior surface of the iron-based particles and, after compression molding by a powder metallurgy technique, are incorporated into the microstructural pores between adjacent particles of iron-based powder. A composite structure formed from the composition of the present invention has an improved overall permeability and overall resistivity. A binder, such as a thermoplastic polyacrylate, may be added to the admixture of iron-based and ferrite powders for promoting the association of the ferrite powder with the iron-based powder.Type: ApplicationFiled: January 9, 2001Publication date: July 11, 2002Inventor: David Earl Gay
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Patent number: 6413919Abstract: The invention concerns a process for the preparation of a lubricant combination including to steps of selecting a first and a second lubricant; mixing the lubricants and subjecting the mixture to conditions for adhering the particles of the second lubricant to the particles of the first lubricant in order to form a lubricant combination of aggregate particles having a core of the first lubricant, the surface of the core being coated with particles of the second lubricant. The invention also concerns a surface modified lubricant combination including a core of a first lubricant, the surface of which is coated with particles of a second lubricant.Type: GrantFiled: January 26, 2001Date of Patent: July 2, 2002Assignee: Höganäs ABInventor: Hilmar Vidarsson
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Publication number: 20020073803Abstract: Metallurgical powder compositions are provided that include silicon carbide to enhance the strength, ductility, and machine-ability of the compacted and sintered parts made therefrom. The compositions generally contain a metal powder, such as an iron-based powder, that constitutes the major portion of the composition. A silicon carbide-containing powder is blended with the metal powder, preferably in the form of a silicon carbide powder. Optionally, common alloying powders, lubricants, binding agents, and other powder metallurgy additives can be blended into the metallurgical composition. The metallurgical powder composition is used by compacting it in a die cavity to produce a “green” compact that is then sintered, preferably at relatively high temperatures.Type: ApplicationFiled: November 5, 2001Publication date: June 20, 2002Applicant: Hoeganaes CorporationInventors: Kalathur S. Narasimhan, Nikhilesh Chawla
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Patent number: 6399018Abstract: Solid objects are made by means of a novel multi-step forming, debinding, sintering and infiltrating process, using a metal-ceramic composition. In this process, the mixture is held for a period of time to degas and settle the powdered material from a liquid binder. The packed geometry is then heated to above the melting temperature of the binder to remove the binder portion of the solid geometry. Upon removal of the binder the binder-free solid geometry is raised to a temperature where the metal pre-sinters together into a three-dimensional rigid matrix with interconnected porosity to form a solid precursor. The porous matrix includes the particulate ceramic material and a first metal, which are at least partially sintered. A molten second metal is then introduced to the fill the porous matrix and form an infiltrated matrix.Type: GrantFiled: April 16, 1999Date of Patent: June 4, 2002Assignee: The Penn State Research FoundationInventors: Randall M. German, Timothy J. Weaver, Julian A. Thomas, Sundar V. Atre, Anthony Griffo