Chemical Blending Patents (Class 419/34)
  • Patent number: 9406445
    Abstract: A capacitor for use in relatively high voltage environments is provided. During formation, anodization may be carried out in a manner so that the dielectric layer possesses a relatively thick portion that overlies an external surface of the anode and a relatively thin portion that overlies an interior surface of the anode. In addition to employing a dielectric layer with a differential thickness, the solid electrolyte is also formed from the combination of pre-polymerized conductive polymer particles and a hydroxy-functional nonionic polymer.
    Type: Grant
    Filed: July 15, 2013
    Date of Patent: August 2, 2016
    Assignee: AVX Corporation
    Inventors: Jan Petrzilek, Martin Biler
  • Patent number: 8992827
    Abstract: A process is provided for producing aluminum-titanium-boron grain refining master alloys containing soluble titanium aluminide and insoluble aluminum boride particles, the process comprising mixing aluminum-boron alloy powder and K2TiF6 salt to obtain a blended mixture, heat treating the mixed powder blend thus obtained in an inert gas furnace just below the melting point of aluminum, at approximately 650 degrees Celcius sufficiently long and compacting the heated powder blend in the form of tablets. The cast grain size of an aluminum- 7 wt % silicon foundry alloy after inoculation with this master alloy at an addition level of 0.02% Ti was less than 200 microns for contact times of upto 15 minutes.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: March 31, 2015
    Assignee: Tubitak
    Inventor: Yucel Birol
  • Patent number: 8636948
    Abstract: The present invention provides iron-based infiltration methods for manufacturing powder metallurgy components, compositions prepared from those methods, and methods of designing those infiltration methods. Iron-based infiltration methods table include the steps of providing an iron-based infiltrant composed of a near eutectic liquidus composition of a first iron based alloy system and an iron-based base compact composed of a near eutectic solidus powder composition of a second iron based alloy system. The base compact is placed in contact with the infiltrant and heated to a process temperature above the melting point of the infiltrant to form a liquid component of the infiltrant. Lastly, the base compact is infiltrated with the liquid component of the infiltrant. During infiltration, the liquid component of the infiltrant flows into the pores of the base compact.
    Type: Grant
    Filed: December 3, 2004
    Date of Patent: January 28, 2014
    Assignee: Hoeganaes Corporation
    Inventors: Frederick J. Semel, Kalathur S. Narasimhan
  • Patent number: 8501048
    Abstract: The present invention provides a metal-graphite composite material favorable to two-dimensional diffusion of heat and having a high thermal conductivity in two axial directions, and a production method therefor. The metal-graphite composite material of the present invention includes: 20 to 80% by volume of a scaly graphite powder; and a matrix selected from the group consisting of copper, aluminum and alloys thereof, wherein the scaly graphite powder in which a normal vector to a scaly surface thereof is tilted at 20° or higher with respect to a normal vector to a readily heat-conducting surface of the metal-graphite composite material is 15% or less relative to a whole amount of the scaly graphite powder, and the metal-graphite composite material has a relative density of 95% or higher.
    Type: Grant
    Filed: October 14, 2008
    Date of Patent: August 6, 2013
    Assignee: Shimane Prefectural Government
    Inventors: Toshiyuki Ueno, Takashi Yoshioka
  • Patent number: 8119203
    Abstract: A method of treating a substrate by applying a layer of at least one metal to the substrate to form an applied metal layer on the substrate and followed by curing of the applied metal layer at sub-atmospheric pressure to form a metal protective layer. A method of treating a substrate by applying a layer of at least one metal to a substrate of an unassembled component of a reactor system to form an applied metal layer on the substrate of the unassembled component and curing the applied metal layer on the substrate of the unassembled component to form a metal protective layer. A method of treating a substrate by applying a layer of at least one metal to the substrate to form an applied metal layer, curing the applied metal layer at a first temperature and pressure for a first period of time, and curing the applied metal layer at a second temperature and pressure for a second period of time, wherein the curing forms a metal protective layer.
    Type: Grant
    Filed: May 30, 2006
    Date of Patent: February 21, 2012
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Robert L. Hise, Geoffrey E. Scanlon, Joseph Bergmeister, III, Daniel B. Knorr
  • Patent number: 8025710
    Abstract: Provided are an ancillary material, used for shape processing, which is capable of shortening a processing time, avoiding a reduction in quality of a shape provided to a workpiece material, and allowing a relatively low manufacturing cost; a processing method using the ancillary material; and a method of manufacturing the ancillary material. The tungsten alloy grains (1) comprise: tungsten of greater than or equal to 80% by mass and less than or equal to 98% by mass; nickel; at least one kind of metal selected from the group consisting of iron, copper, and cobalt; and an inevitable impurity, a maximum diameter thereof is greater than or equal to 0.1 mm and less than or equal to 5.00 mm, and a specific surface area thereof is less than or equal to 0.02 m2/g. The tungsten alloy grains (1, 10), the workpiece material (30), an abrasive (20) are blended in a container (100) and the container is rotated, thereby processing the shape of the workpiece material (30).
    Type: Grant
    Filed: November 20, 2006
    Date of Patent: September 27, 2011
    Assignee: A.L.M.T. Corp.
    Inventors: Shinji Kikuhara, Hitoshi Inoue, Noboru Uenishi, Satoshi Umemoto
  • Patent number: 7871561
    Abstract: An artificial bone which is excellent in the ability to form bone in a living body, reliably thereof, and has high mechanical strength. The process comprises the steps of: mixing granules, composed of a titanium or a titanium alloy powder and an organic binder, with a particulate pore-forming material, pressure-molding the mixture to obtain a molded body, firing the molded body at 1200° C. to obtain a porous body, bringing the porous body into contact with an aqueous alkali solution, subsequently with water of 35° C. or higher for a period longer than that of contacting with the aqueous alkali solution and then heating the porous body at 100 to 650° C., preferably 200 to 600° C.
    Type: Grant
    Filed: March 22, 2006
    Date of Patent: January 18, 2011
    Assignee: Japan Science and Technology Agency
    Inventors: Tadashi Kokubo, Takehiro Shibuya
  • Patent number: 7842231
    Abstract: An article made of constituent elements is prepared by furnishing at least one nonmetallic precursor compound, wherein all of the nonmetallic precursor compounds collectively contain the constituent elements. The constituent elements include a titanium-base metallic composition, boron present at a level greater than its room-temperature solid solubility limit, and, optionally, a stable-oxide-forming additive element present at a level greater than its room-temperature solid solubility limit. The precursor compounds are chemically reduced to produce a material comprising a titanium-base metallic composition having titanium boride particles therein, without melting the titanium-base metallic composition. The titanium-base metallic composition having the titanium boride particles therein is consolidated without melting.
    Type: Grant
    Filed: April 18, 2008
    Date of Patent: November 30, 2010
    Assignee: General Electric Company
    Inventors: Andrew Philip Woodfield, Eric Allen Ott, Clifford Earl Shamblen, Michael Francis Gigliotti, David Alan Utah, Alan Glen Turner
  • Patent number: 7833472
    Abstract: An article is prepared by furnishing a plurality of powder particle substrates made of a substrate metal, providing a nonmetallic precursor of a metallic coating material, wherein the metallic coating material comprises an alloying element that is thermophysically melt incompatible with the substrate metal, contacting the powder particle substrates with the nonmetallic precursor, chemically reducing the nonmetallic precursor to form coated powder particles comprising the powder particle substrates having a surface-enriched layer of the metallic coating material thereon without melting the powder particle substrates, and processing the coated powder particles to form the article, without melting the powder particle substrates.
    Type: Grant
    Filed: June 1, 2005
    Date of Patent: November 16, 2010
    Assignee: General Electric Company
    Inventors: Eric Allen Ott, Andrew Philip Woodfield, David Paul Mourer, John Frederick Ackerman, Jon Raymond Groh, Robert Edward Schafrik, Kenneth Rees Bain, Michael Francis Xavier Gigliotti, Matthew Bernard Buczek
  • Patent number: 7771649
    Abstract: Disclosed herein is a method of producing an ultrafine crystalline TiN/TiB2 composite cermet. In the method, titanium nitride (TiN)/titanium boride (TiB2)/stainless steel composite nanopowder is produced through a reaction milling process using titanium (Ti), boron nitride (BN), and stainless steel powders as raw material powders, and the resulting composite nanopowder is liquid-phase sintered. The method comprises a first step of mixing titanium powder and boron nitride powder at a molar ratio of 3:2, a second step of mixing 5-60 wt % stainless steel powder and the powder mixture, a third step of feeding the powder mixture along with a ball having a predetermined diameter into a jar and conducting a high energy ball milling process to produce titanium nitride/titanium boride/stainless steel composite nanopowder, and a fourth step of shaping and sintering the resulting composite nanopowder.
    Type: Grant
    Filed: November 19, 2007
    Date of Patent: August 10, 2010
    Assignee: Korea Institute of Science and Technology
    Inventors: Jae Hyeok Shim, Ji Woo Kim, Young Whan Cho
  • Patent number: 7722804
    Abstract: In a method of manufacturing a pressed scandate dispenser cathode, firstly, scandium nitrate, barium nitrate, calcium nitrate, aluminum nitrate and ammonium metatungstate (AMT) are dissolved in de-ionized water, respectively, and then mixed with a solution of a cross-link agent such as citric acid and H2O2. After water bathing, the mixed aqueous solution turns into gel, and the powders are obtained after the gel calcination. Secondly, the calcined powders are reduced by hydrogen. Finally, the reduced powders are pressed into shapes and then sintered in the furnace with the atmosphere of hydrogen or by Spark Plasma Sintering (SPS 3.202-MK-V) in vacuum.
    Type: Grant
    Filed: August 8, 2007
    Date of Patent: May 25, 2010
    Assignee: Beijing University of Technology
    Inventors: Jinshu Wang, Wei Liu, Meiling Zhou, Yiman Wang, Hongyi Li, Tieyong Zuo
  • Patent number: 7510680
    Abstract: A metallic alloy having at least two metallic constituents is produced by first furnishing at least two non-oxide compounds, wherein the non-oxide compounds collectively comprise each of the metallic constituents, and wherein each of the non-oxide compounds is soluble in a mutual solvent. The method further includes dissolving the non-oxide compounds in the mutual solvent to produce a solution containing the metallic constituents, thereafter heating the solution to remove the mutual solvent and oxidize the metallic constituents to produce a mixed metallic oxide, thereafter cooling the mixed metallic oxide to form a substantially homogeneous mixed metallic oxide solid mass, and thereafter chemically reducing the mixed metallic oxide solid mass to produce a metallic alloy. The metallic alloy may be consolidated or otherwise processed.
    Type: Grant
    Filed: December 13, 2002
    Date of Patent: March 31, 2009
    Assignee: General Electric Company
    Inventors: James Dale Steibel, Andrew Philip Woodfield
  • Patent number: 7459031
    Abstract: A method for producing an Nb3Sn superconductive wire material using a powder process is provided, in which a powdered raw material is filled in a sheath made of Nb or an Nb-based alloy, and the above sheath is subjected to diameter reduction to form a wire, followed by heat treatment to form a superconducting layer at the interface between the sheath and the filled powder. The above powdered raw material contains powdered Sn, powdered Cu, and a powdered alloy or a powdered intermetallic compound, which is formed from Sn and at least one metal selected from the group consisting of Ti, Zr, Hf, V, and Ta.
    Type: Grant
    Filed: September 12, 2005
    Date of Patent: December 2, 2008
    Assignee: Kabushiki Kaisha Kobe Seiko Sho
    Inventors: Takayoshi Miyazaki, Hiroyuki Kato, Kyoji Zaitsu, Kyoji Tachikawa
  • Patent number: 7410610
    Abstract: An article made of constituent elements is prepared by furnishing at least one nonmetallic precursor compound, wherein all of the nonmetallic precursor compounds collectively contain the constituent elements. The constituent elements include a titanium-base metallic composition, boron present at a level greater than its room-temperature solid solubility limit, and, optionally, a stable-oxide-forming additive element present at a level greater than its room-temperature solid solubility limit. The precursor compounds are chemically reduced to produce a material comprising a titanium-base metallic composition having titanium boride particles therein, without melting the titanium-base metallic composition. The titanium-base metallic composition having the titanium boride particles therein is consolidated without melting.
    Type: Grant
    Filed: November 12, 2004
    Date of Patent: August 12, 2008
    Assignee: General Electric Company
    Inventors: Andrew Philip Woodfield, Eric Allen Ott, Clifford Earl Shamblen, Michael Francis Xavier Gigliotti, David Alan Utah, Alan Glen Turner
  • Patent number: 7384596
    Abstract: A method for preparing a metallic article made of metallic constituent elements includes furnishing a mixture of nonmetallic precursor compounds of the metallic constituent elements. The method further includes chemically reducing the mixture of nonmetallic precursor compounds to produce an initial metallic material, without melting the initial metallic material, and consolidating the initial metallic material to produce a consolidated metallic article, without melting the initial metallic material and without melting the consolidated metallic article.
    Type: Grant
    Filed: July 22, 2004
    Date of Patent: June 10, 2008
    Assignee: General Electric Company
    Inventors: Andrew Philip Woodfield, Clifford Earl Shamblen, Eric Allen Ott, Michael Francis Xavier Gigliotti
  • Patent number: 7288224
    Abstract: A sputtering target contains a target material including as constituent elements Ag, In, Te and Sb with the respective atomic percents (atom. %) of ?, ?, ? and ? thereof being in the relationship of 0.5??<8, 5???23, 17???38, 32???73, ???, and ?+?+?+?=100, and a method of producing the above sputtering target is provided.
    Type: Grant
    Filed: September 25, 2003
    Date of Patent: October 30, 2007
    Assignee: Ricoh Company, Ltd.
    Inventors: Yukio Ide, Hiroko Iwasaki, Yoshiyuki Kageyama, Yujiro Kaneko, Katsuyuki Yamada, Michiaki Shinotsuka, Makoto Harigaya, Hiroshi Deguchi
  • Patent number: 7172725
    Abstract: In W—Cu alloy having a homogeneous micro-structure and a fabrication method thereof, the method includes forming mixed powders by mixing tungsten powders with W—Cu composite powders; forming a compact by pressurizing-forming the mixed powders; forming a skeleton by sintering the compact; and contacting copper to the skeleton and performing infiltration. W—Cu alloy having a homogeneous structure fabricated by the present invention shows better performance by being used as a material for high voltage electric contact of a contact braker, a material for heat sink of an IC semiconductor and a shaped charge liner.
    Type: Grant
    Filed: November 28, 2003
    Date of Patent: February 6, 2007
    Assignee: Agency For Defense Development
    Inventors: Moon-Hee Hong, Ja-Ho Choi, Seoung Lee, Eun-Pyo Kim, Sung-Ho Lee, Joon-Woong Noh
  • Patent number: 6991686
    Abstract: To provide a method for producing a magnetostrictive material of excellent magnetostrictive characteristics. The method for producing a magnetostrictive material, wherein a mixture composed of Starting Materials A, B and C is sintered, where A is represented by Formula 1 (TbxDy1-x)Ty (T is at least one metallic element selected from the group consisting of Fe, Ni and Co, 0.35<x?0.50 and 1.70?y?2.00), B is represented by Formula 2 DytT1-t (0.37?t?1.00), and C contains T, to produce a magnetostrictive material represented by Formula 3 (TbvDy1-v)Tw (0.27?v<0.50, and 1.70?w?2.00), wherein oxygen content is set at 500 to 3,000 ppm for Starting Material A and at 2,000 to 7,000 ppm for Starting Material B.
    Type: Grant
    Filed: January 25, 2005
    Date of Patent: January 31, 2006
    Assignee: TDK Corporation
    Inventors: Seigo Tokoro, Teruo Mori
  • Publication number: 20040253136
    Abstract: An article of aluminum base-metal alloyed with an alloying element is prepared by mixing a chemically reducible nonmetallic base-metal precursor compound of the aluminum base-metal and a chemically reducible nonmetallic alloying-element precursor compound of an alloying element to form a precursor compound mixture. The alloying element may be, but is not necessarily, thermophysically melt incompatible with the aluminum base metal. The method further includes chemically reducing the precursor compound mixture to a metallic alloy, without melting the metallic alloy, and thereafter consolidating the metallic alloy to produce a consolidated metallic article, without melting the metallic alloy and without melting the consolidated metallic article.
    Type: Application
    Filed: June 12, 2003
    Publication date: December 16, 2004
    Inventors: Clifford Earl Shamblen, Andrew Philip Woodfield, Eric Allen Ott, Michael Francis Xavier Gigliotti
  • Publication number: 20040211293
    Abstract: A martensitic steel metallic article (20) made of metallic constituent elements is fabricated from a mixture of nonmetallic precursor compounds of the metallic constituent elements. The mixture of nonmetallic precursor compounds is chemically reduced to produce a metallic martensitic steel, without melting the metallic martensitic steel. The metallic martensitic steel is consolidated to produce a consolidated metallic article (20), without melting the metallic martensitic steel and without melting the consolidated metallic article (20).
    Type: Application
    Filed: April 25, 2003
    Publication date: October 28, 2004
    Inventors: Clifford Earl Shamblen, Andrew Philip Woodfield, Eric Allen Ott, Michael Francis Xavier Gigliotti
  • Publication number: 20040208773
    Abstract: A method for preparing an article of a base metal alloyed with an alloying element includes the steps of preparing a compound mixture by the steps of providing a chemically reducible nonmetallic base-metal precursor compound of a base metal, providing a chemically reducible nonmetallic alloying-element precursor compound of an alloying element, and thereafter mixing the base-metal precursor compound and the alloying-element precursor compound to form a compound mixture. The compound mixture is thereafter reduced to a metallic alloy, without melting the metallic alloy. The step of preparing or the step of chemically reducing includes the step of adding an other additive constituent. The metallic alloy is thereafter consolidated to produce a consolidated metallic article, without melting the metallic alloy and without melting the consolidated metallic article.
    Type: Application
    Filed: May 17, 2004
    Publication date: October 21, 2004
    Applicant: General Electric Comapny
    Inventors: Andrew Philip Woodfield, Eric Allen Ott, Clifford Earl Shamblen, Michael Francis Xavier Gigliotti
  • Publication number: 20040163491
    Abstract: High purity refractory metals, valve metals, refractory metal oxides, valve metal oxides, or alloys thereof suitable for a variety of electrical, optical and mill product/fabricated parts usages are produced from their respective oxides by metalothermic reduction of a solid or liquid form of such oxide using a reducing agent that establishes (after ignition) a highly exothermic reaction, the reaction preferably taking place in a continuously or step-wise moving oxide such as gravity fall with metal retrievable at the bottom and an oxide of the reducing agent being removable as a gas or in other convenient form and unreacted reducing agent derivatives being removable by leaching or like process.
    Type: Application
    Filed: March 3, 2004
    Publication date: August 26, 2004
    Inventors: Leonid N. Shekhter, Terrance B. Tripp, Leonid L. Lanin, Anastasia M. Conlon, Howard V. Goldberg
  • Publication number: 20040159185
    Abstract: A metallic article made of metallic constituent elements is fabricated from a mixture of nonmetallic precursor compounds of the metallic constituent elements. The mixture of nonmetallic precursor compounds contains more of a base-metal element, such as nickel, cobalt, iron, iron-nickel, and iron-nickel-cobalt than any other metallic element. The mixture of nonmetallic precursor compounds is chemically reduced to produce a metallic superalloy material, without melting the metallic superalloy material. The metallic superalloy material is consolidated to produce a consolidated metallic article, without melting the metallic superalloy material and without melting the consolidated metallic article.
    Type: Application
    Filed: February 19, 2003
    Publication date: August 19, 2004
    Inventors: Clifford Earl Shamblen, Andrew Philip Woodfield, Eric Allen Ott, Michael Francis Xavier Gigliotti
  • Publication number: 20040141869
    Abstract: An article has a metallic matrix made of its constituent elements with a dispersoid distributed therein. The article is prepared by furnishing at least one nonmetallic matrix precursor compound. All of the nonmetallic matrix precursor compounds collectively include the constituent elements of the metallic matrix in their respective constituent-element proportions. A mixture of an initial metallic material and the dispersoid is produced. The matrix precursor compounds are chemically reduced to produce the initial metallic material, without melting the initial metallic material, and the dispersoid is distributed in the initial metallic material. The mixture of the initial metallic material and the dispersoid is consolidated to produce a consolidated article having the dispersoid distributed in the metallic matrix comprising the initial metallic material. The initial metallic material, the dispersoid, and the consolidated article are not melted during the consolidation.
    Type: Application
    Filed: January 22, 2003
    Publication date: July 22, 2004
    Inventors: Eric Allen Ott, Andrew Philip Woodfield, Clifford Earl Shamblen, Michael Francis Xavier Gigliotti
  • Patent number: 6652806
    Abstract: A sputtering target contains a target material including as constituent elements Ag, In, Te and Sb with the respective atomic percents (atom. %) of &agr;, &bgr;, &ggr; and &dgr; thereof being in the relationship of 0.5≦&agr;<8, 5≦&bgr;≦23, 17≦&ggr;≦38, 32≦&dgr;≦73, &agr;≦&bgr;, and &agr;+&bgr;+&ggr;+&dgr;=100, and a method of producing the above sputtering target is provided. An optical recording medium includes a recording layer containing a phase-change recording material which includes as constituent elements Ag, In, Te and Sb with the respective atomic percents of &agr;, &bgr;, &ggr; and &dgr; thereof being in the relationship of 1≦&agr;<6, 7≦&bgr;≦20, 20≦&ggr;≦35, 35≦&dgr;≦70, and &agr;+&bgr;+&ggr;+&dgr;=100, and is capable of recording and erasing information by utilizing the phase change of the recording material in the recording layer.
    Type: Grant
    Filed: September 19, 2001
    Date of Patent: November 25, 2003
    Assignee: Ricoh Company, Ltd.
    Inventors: Yukio Ide, Hiroko Iwasaki, Yoshiyuki Kageyama, Yujiro Kaneko, Katsuyuki Yamada, Michiaki Shinotsuka, Makoto Harigaya, Hiroshi Deguchi
  • Publication number: 20030156964
    Abstract: Rare earth magnetic alloy fine powders are manufactured by placing a mixture of a rare earth metal and a transition metal as raw materials in a crucible, induction heating it in an Ar gas atmosphere, melting metal elements contained in the above mixture, injecting an Ar gas at a predetermined pressure from above the molten alloy to expel the above molten alloy in a downward direction from the nozzle port of the above crucible, and applying a jet stream of an inert gas to the above expelled molten alloy to collide the above expelled molten alloy with the above inert gas so as to scatter the above molten alloy and solidify it by quenching.
    Type: Application
    Filed: December 16, 2002
    Publication date: August 21, 2003
    Inventor: Masami Kikuchi
  • Publication number: 20030124016
    Abstract: The present invention relates to a method of producing W—Cu based composite powder, which is used in heat-sink materials for high-power integrated circuits, electric contact materials, etc, and to a method of producing a W—Cu based sintered alloy by using the composite powder. The method of producing tungsten-copper based composite powder includes first preparing composite oxide powder by dissolving ammonium metatungstate, [(NH4)6(H2W12O40).
    Type: Application
    Filed: October 16, 2002
    Publication date: July 3, 2003
    Inventors: Byoung Kee Kim, Seong Hyeon Hong, Yong Won Woo
  • Publication number: 20030094075
    Abstract: 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: Application
    Filed: July 25, 2002
    Publication date: May 22, 2003
    Inventors: Hilmar Vidarsson, Per Knutsson
  • Patent number: 6478845
    Abstract: A boron addition for making potassium-doped tungsten powder is described herein. Boron is added to a potassium-doped starting material, preferably in the form of boric acid, and then the mixture is reduced to form a potassium-doped tungsten powder. The boron addition results in increased potassium incorporation in the potassium-doped tungsten powder and also effects an increase in potassium retention in sintered compacts of the potassium-doped tungsten powder.
    Type: Grant
    Filed: July 9, 2001
    Date of Patent: November 12, 2002
    Assignee: Osram Sylvania Inc.
    Inventors: Hans-Joachim Lunk, Michael Salmen, Anna S. Nached, Maria B. Winnicka, Henry J. Stevens
  • Patent number: 6409794
    Abstract: A method for producing composite powders based on silver-tin oxide, by chemically reductive precipitation of silver onto particulate tin oxide. A solution of a silver compound and a solution of a reducing agent are simultaneously added in stoichiometrically equivalent amounts, separately and continuously with intensive mixing, to an aqueous suspension of tin oxide. The resulting composite powders have very high homogeneity, and can be processed to make electrical contact materials. The method is particularly suitable for producing composite powders based on silver-tin oxide doped with indium oxide, to be used in the manufacture of electrical contact materials.
    Type: Grant
    Filed: April 4, 2001
    Date of Patent: June 25, 2002
    Assignee: DMC
    Inventors: Roger Wolmer, Mechthild Mueller, Frank Heringhaus, Dietrich Ruehlicke, Dan Goia
  • Patent number: 6245288
    Abstract: A pressable powder is formed by a method comprising [I] mixing, in essentially deoxygenated water, [A] a first powder selected from the group consisting of a transition metal carbide and transition metal with [B] an additional component selected from the group consisting of (i) a second powder comprised of a transition metal carbide, transition metal or mixture thereof; (ii) an organic binder and (iii) combination thereof and [II] drying the mixed mixture to form the pressable powder, wherein the second powder is chemically different than the first powder. The pressable powder may then be formed into a shaped part and subsequently densified into a densified part, such as a cemented tungsten carbide.
    Type: Grant
    Filed: January 31, 2000
    Date of Patent: June 12, 2001
    Assignee: OMG Americas, Inc.
    Inventor: Daniel F. Carroll
  • Patent number: 6238456
    Abstract: The present invention discloses a tantalum powder for capacitors and a method for making said tantalum powder wherein agglomerated tantalum powder is produced by means of thermal agglomeration of starting tantalum powders in the presence of hydrogen.
    Type: Grant
    Filed: August 19, 1999
    Date of Patent: May 29, 2001
    Assignee: H. C. Starck GmbH & Co. KG
    Inventors: Rüdiger Wolf, Karlheinz Reichert, Heike Biermann, Josua Löffelholz, Detlef Breithaupt
  • Patent number: 6228138
    Abstract: Machinability is drastically improved while maintaining some degree of hardness in an Fe-based sintered alloy. A good machinability Fe-based sintered alloy has an overall composition of, in percent by weight, at least one element selected from the group consisting of P in an amount of 0.1 to 1.0% and Si in an amount of 2.0 to 3.0%, B in an amount of 0.003 to 0.31%, 0 in an amount of 0.007 to 0.69%, C in an amount of 0.1 to 2.0%, and the balance consisting of Fe and unavoidable impurities, has a matrix hardness ranging from Hv 150 to 250, and has free graphite dispersed therein.
    Type: Grant
    Filed: November 4, 1999
    Date of Patent: May 8, 2001
    Assignee: Hitachi Powdered Metals Co., Ltd.
    Inventors: Yuuji Yamanishi, Tadayuki Tsutsui, Kei Ishii
  • Patent number: 6165412
    Abstract: A method of making a potassium-doped tungsten powder is described comprising forming a mixture of ammonium paratungstate or ammonium metatungstate and a potassium-containing compound selected from a thermally unstable potassium-containing salt or a potassium tungstate, and reducing the mixture in a single step without adding additional dopants to form a potassium-doped tungsten powder. The potassium-doped tungsten powder produced by the method of this invention can be pressed, sintered and drawn to produce a non-sag tungsten wire.
    Type: Grant
    Filed: September 7, 1999
    Date of Patent: December 26, 2000
    Assignee: Osram Sylvania Inc.
    Inventors: Hans-Joachim Lunk, Michael Salmen, Henry J. Stevens
  • Patent number: 6149861
    Abstract: It is an object of the present invention to provide a method for manufacturing a raw material alloy powder that can be utilized effectively in the regeneration of surplus or defective R--Fe--B type sintered magnets while leaving the main phase crystal grains alone, and a method for manufacturing an R--Fe--B type magnet. Surplus or defective R--Fe--B type sintered magnets are pulverized, acid washed, and dried, after which this product is subjected to a calcium reduction treatment and washed to remove the calcium component, which allows a raw material alloy powder composed of an Nd.sub.2 Fe.sub.14 B main phase system, which contributes the most to magnet characteristics, to be regenerated efficiently. An alloy powder for compositional adjustment that improves sintering and adjusts the composition is added to this main phase system raw material alloy powder to produce a sintered magnet, which facilitates the manufacture of a sintered magnet with superior magnet characteristics.
    Type: Grant
    Filed: April 6, 2000
    Date of Patent: November 21, 2000
    Assignee: Sumitomo Special Metals Co., Ltd.
    Inventors: Yuji Kaneko, Yasuhide Sasakawa, Katsuya Kase, Takashi Hashikawa, Kaname Takeya
  • Patent number: 6129890
    Abstract: It has been discovered that potassium retention in NS tungsten processing may be improved by double doping tungsten blue oxide (TBO) prior to reduction. The novel `double-doping` process consists of dry doping standard singly doped K--Al--Si TBO with potassium nitrate, KNO.sub.3, followed by the standard reduction, acid washing, sintering, rolling and drawing steps. In another aspect, the novel method includes an aqueous extraction of heteropolytungstate anion [SiW.sub.11 O.sub.39 ].sup.8- from a sample of the singly doped tungsten blue oxide to predict potassium retention.
    Type: Grant
    Filed: September 7, 1999
    Date of Patent: October 10, 2000
    Assignee: Osram Sylvania Inc.
    Inventors: Hans-Joachim Lunk, Henry J. Stevens, Thomas J. Patrician, Harry D. Martin, III
  • Patent number: 6045748
    Abstract: A method for forming molded articles in any shape from ceramic, glass, or metal powders which comprises: preparing a slurry by dispersing more than one powder selected from a group consisting of ceramic, glass, and metal materials in a dispersing medium using a dispersing agent, and curing by adding a reactive substance that reacts with the dispersing agent to make the dispersibility of the dispersing agent disappear or lower.
    Type: Grant
    Filed: July 29, 1998
    Date of Patent: April 4, 2000
    Assignee: NGK Insulators, Ltd.
    Inventor: Shinzo Hayashi
  • Patent number: 6010661
    Abstract: The methods of the present invention provide efficient mechanical milling or alloying of stock materials of titanium and aluminum in order to increase yield of the titanium stock and reduce cost in connection with the production of a titanium-aluminum-based alloy sinter. Sponge titanium, which has a particle size of 1 to 20 mm and which contains hydrogen at 3.5 mass % or more, is used as the titanium stock. The sponge titanium is ball-milled with an aluminum stock in an argon atmosphere to produce a hydrogen-containing titanium-aluminum-based alloy powder. Furthermore, this powder may be sintered, as required.
    Type: Grant
    Filed: March 11, 1999
    Date of Patent: January 4, 2000
    Assignee: Japan as represented by Director General of Agency of Industrial Science and Technology
    Inventors: Toshihiko Abe, Hitoshi Hashimoto, Young Ho Park
  • Patent number: 5966582
    Abstract: A method for extruding a stiffer powder mixture at lower extrusion pressure involves providing an aqueous mixture of inorganic powder that can be metal, ceramic, glass, glass ceramic, molecular sieve, and/or carbon, fatty acid the main chain of which has at least 12 carbon atoms, thermally gellable cellulose ether binder, and wax that can be paraffin and/or propylene glycol hydroxystearate, wherein the powder is coated with the fatty acid component. If clay is included in the mixture, it is provided as either calcined or hydrous. The mixture is passed through an extruder and through an extrusion die to produce a green extrudate at an extrusion pressure that is equal to or lower than it would be absent the combination of the fatty acid, the cellulose ether binder, and the wax. The mixture in the extruder and the extrudate are stiffer than without this combination.
    Type: Grant
    Filed: October 17, 1997
    Date of Patent: October 12, 1999
    Assignee: Corning Incorporated
    Inventors: Devi Chalasani, Ronald E. Johnson
  • Patent number: 5963772
    Abstract: Electrical contact material made from intimate mixtures of silver powder and a powder of a second phase material is shown in which the powder of the second phase material is milled to produce a selected grain distribution of approximately 90% less than 7-10 microns, approximately 50% between 2 and 5 microns and approximately 10% less than 0.8 to 1.0 microns. The powder of the second phase material is added to a silver salt solution, ammonium hydroxide and hydrazine hydrate to form a precipitate of second phase material particles covered with silver. For applications in which the particles need to be free flowing the particles are compacted together without any binder, broken into chunks and milled to provide granules. In one embodiment homogeneously doped tin oxide particles are disclosed in which tin oxide and the oxide of the dopant are dissolved in nitric acid to produce finely dispersed tin oxide and dopant oxide. The oxides are calcined and ground to the selected grain size distribution.
    Type: Grant
    Filed: December 3, 1998
    Date of Patent: October 5, 1999
    Assignee: Chemet Corporation
    Inventors: Ernest M. Jost, Kirk McNeilly
  • Patent number: 5943545
    Abstract: The object of the present invention is to provide an acid treatment for enhancing the high-rate discharge characteristic, cycle characteristic, and other characteristics of a hydrogen-absorbing alloy electrode to a large extent. The object can be achieved by subjecting a hydrogen-absorbing alloy as a negative electrode active material to an acid treatment comprising the steps of acid-treating the surface of the hydrogen-absorbing alloy by using a metallic ion-containing treatment solution which contains metallic ions and whose initial pH is in the range of 0.5 to 3.0; and heat-treating the hydrogen-absorbing alloy in an atmosphere with the presence of hydrogen.
    Type: Grant
    Filed: November 26, 1997
    Date of Patent: August 24, 1999
    Assignee: Sanyo Electric Co., Ltd.
    Inventor: Tadashi Ise
  • Patent number: 5908588
    Abstract: A process of molding inorganic materials into desired shapes comprises mixing the material with a dispersant, milling, molding the mixture, drying the mixture and sintering.
    Type: Grant
    Filed: February 17, 1998
    Date of Patent: June 1, 1999
    Assignee: Eastman Kodak Company
    Inventors: Syamal K. Ghosh, Dilip K. Chatterjee, James S. Reed, Steven R. Arrasmith
  • Patent number: 5842108
    Abstract: A method for producing high density and ultrafine W/Cu bulk material by a mechano-chemical process is disclosed. In the method of this invention, metal salts as start materials are spray-dried and prepare W--Cu precursor powder having uniformly-dispersed tungsten and copper components. The W--Cu precursor powder in turn is subjected to a desalting and milling process, thus preparing W--Cu oxide composite powder. Thereafter, the W--Cu oxide composite powder may be formed into a formed green body prior to reducing and sintering under hydrogen atmosphere.
    Type: Grant
    Filed: August 13, 1997
    Date of Patent: November 24, 1998
    Assignee: Korea Institute of Machinery & Materials
    Inventors: Byoung-Kee Kim, Gil-Geun Lee, Gook-Hyun Ha, Dong-Won Lee
  • Patent number: 5494634
    Abstract: Graphite or carbon particles with a graphitic skin are intercalated with a compound including an oxidized form of a metal and then reduced in a hydrogen atmosphere. This process reduces the driving force for the galvanic reaction between the particles and active metals in aqueous environments. The particles may be present as a reinforcement for a metal matrix (e.g., graphite/aluminum metal matrix composites) or as a reinforcement for a non-metallic material (e.g., graphite/polyimide, graphite/polyester or graphite/cyanate composites). In the latter case, the composite is adjacent to a metal in a structure.By way of example, the graphite or carbon particle may be a fiber, the metal subject to attack may be aluminum or magnesium, and the intercalation compound may be NiCl.sub.2.
    Type: Grant
    Filed: January 15, 1993
    Date of Patent: February 27, 1996
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Alan S. Edelstein, Richard K. Everett, Patricia P. Trzaskoma, Benji Maruyama
  • Patent number: 5484468
    Abstract: Cemented carbide inserts are available containing WC and cubic phases of carbide and/or carbonitride in a binder phase based on cobalt and/or nickel with a binder phase enriched surface zone. The binder phase content along a line essentially bisecting the rounded edge surfaces increases toward the edge and cubic phase is present. As a result, the edge toughness of the cutting inserts is improved.
    Type: Grant
    Filed: February 7, 1994
    Date of Patent: January 16, 1996
    Assignee: Sandvik AB
    Inventors: Ake Ostlund, Ulf Oskarsson, Per Gustafson, Leif Akesson
  • Patent number: 5427601
    Abstract: A sintered metal body is disclosed of composition consisting essentially of in weight percent about 5 to 40 Cr, about 2 to 30 Al, 0 to about 5 special metal, 0 to about 4 rare earth oxide additive, and the balance Fe group metal and unavoidable impurities,the composition including at least one component selected from component A and/or component B, component A being special metal, and component B being at least an effective amount of rare earth oxide additive,the special metal being a first special metal component, and optionally, a second special metal component when rare earth oxide additive is 0, the first special metal component consisting of at least one of: Y, lanthanides, Zr, Hf, Ti, Si, and B, and the second special metal component consisting of at least one of: alkaline earth metal, Cu, and Sn, and the special metal being a third special metal component when rare earth oxide additive is >0, the third special metal component consisting of at least one of Y, lanthanides, Zr, Hf, Ti, Si, alkaline ear
    Type: Grant
    Filed: September 30, 1991
    Date of Patent: June 27, 1995
    Assignees: NGK Insulators, Ltd., Corning Inc.
    Inventors: Takashi Harada, Yoshihiro Fujiwara, Fumio Abe, Tsuneaki Ohashi, Hiroshige Mizuno, Kevin R. Brundage, Srinivas H. Swaroop, David F. Thompson, Raja R. Wusirika, David S. Weiss
  • Patent number: 5366687
    Abstract: A method is taught for the preparation of ceramic fibers by electrophoretic deposition of metal oxide upon a conductive fiber core, which core may be subsequently removed.
    Type: Grant
    Filed: December 10, 1993
    Date of Patent: November 22, 1994
    Assignee: United Technologies Corporation
    Inventors: William J. Dalzell, Jr., Robert J. Wright, Jarrett L. Spence
  • Patent number: 5360494
    Abstract: A powdered magnesium composition is mixed with lithium dispersed in an inert, non-water absorbent, liquid medium to produce a substantially homogenous admixture that is heated to melt the lithium and vaporize the liquid medium to thereby obtain a decovered powdered alloy comprising aluminum and lithium. The liquid medium has first and second liquid constituents, wherein the first liquid constituent has a boiling point below the melting point of lithium and the second liquid constituent has a boiling point above the melting point of lithium but below the melting point of the alloy being produced.
    Type: Grant
    Filed: July 29, 1993
    Date of Patent: November 1, 1994
    Inventor: Sanford W. Brown
  • Patent number: 5292478
    Abstract: The present invention relates to a copper-molybdenum composite material having utility in electrical applica- tions and the process for forming the composite material. The composite material is characterized by a continuous copper matrix having a plurality of discrete molybdenum particles embedded therein. The molybdenum particles have an aspect ratio in the range of from about 1:1 to about 4:1 so as to create a thermal path through the matrix from a first side of the composite material to a second side of the composite material. The resulting composite material exhibits improved through-thickness thermal conductivity as a result of the molybdenum particles being within the aforementioned range.
    Type: Grant
    Filed: June 24, 1991
    Date of Patent: March 8, 1994
    Assignee: Ametek, Specialty Metal Products Division
    Inventor: Clive Scorey
  • Patent number: 5252255
    Abstract: A conductive metal-filled substrate is formed by intermingling copper or nickel particles into the substrate, contacting the metal particles with a specified developing agent, and heating the metal particles and the developing agent. The filled substrates are electrically conductive and are useful for a variety of uses such as EMI shielding.
    Type: Grant
    Filed: June 11, 1990
    Date of Patent: October 12, 1993
    Assignee: Akzo America Inc.
    Inventors: Paul Y. Y. Moy, William J. E. Parr, Dieter Frank, Ronald E. Hutton