Base Metal One Or More Of Copper(cu) Or Noble Metal Patents (Class 75/247)
  • Patent number: 6090178
    Abstract: A frangible metal bullet, a method for making it, and ammunition made therefrom. The frangible metal bullet is formed from a mixture of metal particles and metal or metalloid binder forming material which is compacted into the desired shape, heated to a temperature above that needed to form at least one intermetallic compound but below the temperature of joining of the metal particles by sintering and below the temperature of formation of substantial amounts of a ductile alloy of the metal of the particles and the metal or metalloid binder forming material and then cooled. Such bullets have sufficient strength to maintain their integrity during firing but disintegrate into powder on impact and can be formulated to be lead-free.
    Type: Grant
    Filed: November 5, 1998
    Date of Patent: July 18, 2000
    Assignee: SinterFire, Inc.
    Inventor: Joseph C. Benini
  • Patent number: 6074454
    Abstract: The invention relates to bullets having increased frangibility (or which can be easily fragmented) and to materials and processes for the manufacture of such bullets. The bullets of the present invention are typically made from copper or copper alloy powders (including brass, bronze and dispersion strengthened copper) which are pressed and then sintered under conditions so as to obtain bullets with the desired level of frangibility. In preferred embodiments of the invention, the bullets also contain several additives that increase or decrease their frangibility.
    Type: Grant
    Filed: July 11, 1996
    Date of Patent: June 13, 2000
    Assignee: Delta Frangible Ammunition, LLC
    Inventors: John T. Abrams, Anil V. Nadkarni, Roy Kelly
  • Patent number: 6039785
    Abstract: The invention concerns a material for the powder-metallurgical production from a powder mixture containing at least approximately 50 wt. % copper in particular of valve seat rings or valve guides with high resistance to wear and corrosion and high heat conductivity. The starting powder mixture consists of between 50 and 90 wt. % of a basic powder, containing the copper portion, and between 10 and 50 wt. % of a powdery molybdenum-containing alloy flux. The basic powder is a copper powder which is dispersion-hardened by Al.sub.2 O.sub.3, has an Al.sub.2 O.sub.3 content of between 0.1 and 1.1 wt. %, and is produced by pulverizing a Cu--Al melt followed by heating in an oxidizing atmosphere. The invention further concerns the use of a dispersion-hardened powder of this type for the powder-metallurgical production in particular of wear and corrosion-resistant valve seat rings or valve guides with high heat conductivity. Finally, the invention concerns a method of producing such valve seat rings or valve guides.
    Type: Grant
    Filed: October 15, 1998
    Date of Patent: March 21, 2000
    Assignees: Bleistahl Produktions-GmbH & Co. KG, SCM Metal Products, Inc.
    Inventors: Kirit Dalal, Ekkehard Kohler, Anil V. Nadkarni
  • Patent number: 6022629
    Abstract: There is described a copper-based sliding layer comprising a matrix of copper or a copper alloy with softer metallic inclusions of at least 10 wt-% which form particles having sectional areas separate from each other with respect to an observation plane parallel to the layer. To combine favorable strength values with good tribological properties, it is suggested that when adding up the sectional areas of the particles starting with the smallest sectional area and proceeding according to ascending area size the sectional area (F.sub.50) of that particle which completes the subtotal of the sectional areas up to its own area size to 50% of the final total corresponds to a maximum of ten times the sectional area (F.sub.5) of the particle completing the subtotal to 5% of the final total, but at least one fifth of the largest individual sectional area (F.sub.100).
    Type: Grant
    Filed: January 9, 1998
    Date of Patent: February 8, 2000
    Assignee: Miba Gleitlager Aktiengesellschaft
    Inventors: Thomas Rumpf, Walter Gartner
  • Patent number: 6004370
    Abstract: A sintered friction material especially suitable for use in a braking system has a matrix of a copper-system metal such as copper, tin, nickel and aluminum, and contains a specific additive, graphite and potassium titanate as friction conditioners. The specific additive consists of at least one material selected from a group consisting of zirconium oxide, silica, dolomite, orthoclase and magnesium oxide. The specific additive, the graphite and the potassium titanate are preferably blended in volume ratios of 1 to 15%, 10 to 50% and 5 to 30% respectively. The form of the potassium titanate is at least one of whiskery, platy and spherical forms and preferably plate-like or spherical. The sintered friction material has good abrasion resistance, low abrasion of the counterpart, a high friction coefficient, excellent material strength, good chattering resistance, and good squealing resistance.
    Type: Grant
    Filed: August 31, 1998
    Date of Patent: December 21, 1999
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Takatoshi Takemoto, Yukinori Yamashita
  • Patent number: 6001149
    Abstract: A contact material, a shaped article or contact piece and a process for producing a shaped article from a contact material based on silver, include forming a powder mixture from silver and a metal oxide, and metallurgically processing the powder to form the shaped article with the metal oxide being reduced to metal. Since metal oxide powders are obtainable with a very much smaller particle size than metal powders, it is possible to obtain a contact material with a mean particle size of the metal incorporated as an active component of less than 1 .mu.m. Such a contact material has particularly favorable switching properties as a result of the fine particle size.
    Type: Grant
    Filed: July 27, 1998
    Date of Patent: December 14, 1999
    Assignee: Siemens Aktiengesellschaft
    Inventors: Franz Hauner, Gunter Tiefel
  • Patent number: 5993731
    Abstract: The process for producing net shape or near net shape metal parts is improved by sintering a compact in a reducing atmosphere where the compact contains a metal and chemically-bound oxygen in the form of a metal oxide, for example, and the chemically-bound oxygen is in an amount sufficient to improve the sintering of the compact. Improved sintering is facilitated when the metal oxide forms a metal/metal oxide eutectic during reduction of the chemically-bound oxygen in a reducing atmosphere during the sintering process. The compact can contain a metal oxide and a solution compound to produce an alloy part, provided the chemically-bound oxygen is present in an amount sufficient to improve sintering. In a preferred embodiment, the compact also contains a reinforcement compound and is sintered to make a metal matrix composite. The resultant density of the near net shape metal parts made by the improved sintering process is preferably about 97% or more of the theoretical density.
    Type: Grant
    Filed: November 7, 1997
    Date of Patent: November 30, 1999
    Assignee: Brush Wellman, Inc.
    Inventors: David E. Jech, Juan L. Sepulveda, Anthony B. Traversone
  • Patent number: 5972070
    Abstract: A sintered friction material includes a copper alloy base and hard particles. The copper alloy base includes copper and at least one of, and preferably both, Zn and Ni within a total range of 5 to 40 wt % of the copper alloy base. The hard particles are uniformly dispersed in a matrix formed by the original composite copper alloy powder constituting the base, in a content amount j within a range of 10 to 30 wt % of the friction material.
    Type: Grant
    Filed: August 22, 1997
    Date of Patent: October 26, 1999
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Katsuyoshi Kondoh, Yoshishige Takano
  • Patent number: 5955686
    Abstract: A brazing material having 0.25-0.9 wt % of titanium oxide added to a basic formula consisting of 60-94.25 wt % Ag, 5-30 wt % Cu and 0.5-4.5 wt % of an active metal is processed to form a paste, which is applied to an AlN substrate and overlaid with a copper plate and heat treated to form a joint between the AlN substrate and the copper plate. A resist is applied to the copper plate to form a circuit pattern, which is etched to form a metallized circuit, thereby producing a metal-ceramics composite substrate capable of operation on high electrical power. The substrate is improved in various characteristics of a power module device over the composite substrates produced by using the conventional brazing materials.
    Type: Grant
    Filed: May 2, 1997
    Date of Patent: September 21, 1999
    Assignee: Dowa Mining Co., Ltd.
    Inventors: Masami Sakuraba, Masami Kimura, Junji Nakamura, Takashi Ono
  • Patent number: 5956561
    Abstract: A method for making dies or molds from powdered metals is disclosed. The method includes the steps of: providing a pattern of a desired shape to define the mold or die cavity configuration; providing a canister; placing the pattern in the canister and filling the canister with a selected powdered metal; hot isostatic pressing the canister and powdered metal to produce a consolidated and densified compact; and sectioning the compact along a plane to enable removal of the pattern and thus providing the desired die or mold cavity in the fully densified powdered metal die or mold set so formed.
    Type: Grant
    Filed: January 14, 1998
    Date of Patent: September 21, 1999
    Assignee: Dynamet Incorporated
    Inventors: Clifford M. Bugle, Carl A. Lombard
  • Patent number: 5935485
    Abstract: A piezoelectric material includes a PZT ceramic, and a noble metal component. The noble metal component is added to the PZT ceramic in an amount of 0.35 parts by volume or more with respect to 100 parts by volume of the PZT ceramic, and is at least one element selected from the group consisting of Ru, Rh, Pd, Os, Ir, Pt and Au, or is an alloy of silver (Ag) and the noble metal element. A piezoelectric element includes a pair of external electrodes, at least a pair of piezoelectric layers, and a conductive layer. The piezoelectric layers are formed of the PZT ceramic, and are disposed between the external electrodes. The conductive layer is formed of the noble metal component, and is insulated from the external electrodes. The piezoelectric layers and the conductive layer are formed lamellarly, and are laminated alternately in a direction connecting the external electrodes.
    Type: Grant
    Filed: October 30, 1997
    Date of Patent: August 10, 1999
    Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho
    Inventors: Takao Tani, Hiroaki Makino, Nobuo Kamiya
  • Patent number: 5925837
    Abstract: A manufacturing method and products of metallic friction materials includes processes of 1. preparing powder materials, 2. mixing copper as a base, proper proportion of iron powder or steel wool, aluminum powder, zinc or tin or lead powder, graphite powder and alumina or silicon dioxide powder, 3. pressing mixed materials into green bodies under 375.about.625 MPa at room temperature, 4. pre-heat treating the green bodies in an air furnace with temperature raised to 100.about.300.degree. C. for 1.about.3 hours, 5. sintering the green bodies into test samples under 350.about.750 MPa for 24.about.60 hours to gain sintered friction materials having an oxidized layer of less than 1 mm thick, 6. processing and grinding the sintered test samples with grinders to remove the oxidized layer, 7. washing the outer surface of the sintered test samples ground into finished products. The method of the invention may reduce largely difficulty in manufacturing processes, the investment and productive cost.
    Type: Grant
    Filed: September 16, 1998
    Date of Patent: July 20, 1999
    Assignees: Chien-Ping Ju, Jiin-Huey Chen Lin
    Inventors: Chien-Ping Ju, Jiin-Huey Chen Lin, Sun-Zen Chen
  • Patent number: 5897962
    Abstract: A method of making flowable tungsten/copper composite powder by milling an aqueous slurry of a mixture of the desired weight ratio of tungsten powder and copper oxide powder and, optionally, a small amount of cobalt powder, spray-drying the slurry to form spherical, flowable agglomerates, and reducing the agglomerates in a hydrogen atmosphere.
    Type: Grant
    Filed: July 13, 1995
    Date of Patent: April 27, 1999
    Assignee: Osram Sylvania Inc.
    Inventors: David L. Houck, Nelson Kopatz, Muktesh Paliwal, Sanjay Sampath
  • Patent number: 5882493
    Abstract: A sputtering target, for forming a recording layer of an optical recording medium in which information is written and erased through a transition between two phases by utilizing electromagnetic wave energy, consists of a heat-treated and sintered composition represented by the formula:Ag.sub..alpha. In.sub..beta. Te.sub..gamma. Sb.sub..delta.wherein2.ltoreq..alpha..ltoreq.303.ltoreq..beta..ltoreq.3010.ltoreq..gamma..ltoreq.5015.ltoreq..delta..ltoreq.83.alpha.+.beta.+.gamma.+.delta.=100A method of producing the sputtering target, an optical recording medium having a recording layer formed through sputtering by use of the sputtering target, and a method of forming the recording layer are also disclosed.
    Type: Grant
    Filed: October 8, 1997
    Date of Patent: March 16, 1999
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroko Iwasaki, Yoshiyuki Kageyama, Makoto Harigaya, Masaetsu Takahashi, Hiroshi Deguchi, Katsuyuki Yamada, Yoshitaka Hayashi, Yukio Ide
  • Patent number: 5869778
    Abstract: Apparatus for use in cooling an integrated circuit structure. The apparatus includes a heat sink having a first portion configured for thermal engagement with an integrated circuit device and a second portion configured for the dissipation of heat into an ambient fluid, such as air. The heat sink is made from a powdered metal which, in one preferred embodiment, includes copper. The heat sink may be formed from the plurality of discrete layers, each layer having a button projecting from one surface, and a depression formed in an opposing surface. The depression is configured to receive a projecting button portion from another layer. In an alternative embodiment the heat sink includes a plurality of plugs projecting from the generally flat surface.
    Type: Grant
    Filed: April 22, 1997
    Date of Patent: February 9, 1999
    Assignee: LSI Logic Corporation
    Inventor: Mark R. Schneider
  • Patent number: 5850047
    Abstract: A method of producing copper powder having little variation in its particle size and an excellent monodispersion properties. A copper complex ion solution is prepared from a copper-containing solution and a complexing agent, then a reducing agent is added to the copper complex ion solution to precipitate metallic copper. The copper-containing solution herein contains copper sulfate, copper formate, copper pyrophosphate, copper chloride or copper carbonate and the complexing agent is at least one carboxylate or phosphate.
    Type: Grant
    Filed: March 11, 1997
    Date of Patent: December 15, 1998
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Hiroji Tani, Naoaki Ogata
  • Patent number: 5846288
    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: November 26, 1996
    Date of Patent: December 8, 1998
    Assignee: Chemet Corporation
    Inventors: Ernest M. Jost, Kirk McNeilly
  • Patent number: 5841044
    Abstract: Silver-iron materials for electrical switching contacts with properties which come very close to those of silver-nickel materials formed of 0.5 to 4.5% by weight iron and 0.05 to 2% by weight of one or more of the oxides magnesium oxide, calcium oxide, yttrium oxide, lanthanum oxide, titanium oxide, zirconium oxide, hafnium oxide, cerium oxide, niobium oxide, tantalum oxide, chromium oxide, manganese oxide, iron oxide, zinc oxide, aluminum oxide, indium oxide, silicon oxide, and tin oxide, the balance being silver.
    Type: Grant
    Filed: November 19, 1996
    Date of Patent: November 24, 1998
    Assignee: Degussa Aktiengesellschaft
    Inventors: Wolfgang Weise, Willi Malikowski, Roger Wolmer, Peter Braumann, Andreas Koffler
  • Patent number: 5841042
    Abstract: The present invention is related to a brake lining material for a heavy-load braking device. The present invention is to provide a novel brake lining material which can have extended useful life under heavy-load conditions, can retain stable coefficients of friction under such heavy load conditions, can have appropriate wear resistance and can reduce the wear of its opponent material significantly. In accordance with the present invention,the novel brake lining material is provided which comprises copper-base metal powder, refractory material powder and graphite powder, the metal powder containing iron powder and titanium powder and being used as a matrix, the refractory material powder and the graphite powder being sintered together with this matrix in a uniformly distributed state in the powder.
    Type: Grant
    Filed: April 29, 1996
    Date of Patent: November 24, 1998
    Assignee: Tokyo Yogyo Kabushiki Kaisha
    Inventor: Yoshinari Kato
  • Patent number: 5831186
    Abstract: An electrical contact for use in an electrical switching device is provided having low contact resistance, high wear resistance and high anti-weld characteristics. The contact includes a material composition of between 0.2 and 8% by weight Gr, between 10 and 90% by weight W and the remaining mixture consisting of Ag. The contact is manufactured using a process which yields a unique microstructure characterized by not having an interconnected Gr network around the Ag thereby providing a strong Ag to Ag bond. This process includes the steps of adding the appropriate amounts of Ag, W and Gr powder material together, blending together under low shear conditions to provide a homogenous powder mixture while prohibiting the Gr from smearing onto the Ag, pressing the material mixture to form a contact, and then sintering and coining the contact.
    Type: Grant
    Filed: April 1, 1996
    Date of Patent: November 3, 1998
    Assignee: Square D Company
    Inventors: Jon W. Oswood, James P. Bodin, Randy L. Siebels, Eugene W. Wehr
  • Patent number: 5824923
    Abstract: A sintered friction material includes a copper alloy base and hard particles. The copper alloy base includes copper and at least one of, and preferably both, Zn and Ni within a total range of 5 to 40 wt % of the copper alloy base. The hard particles are uniformly dispersed in a matrix formed by the original composite copper alloy powder constituting the base, in a content amount within a range of 10 to 30 wt % of the friction material.
    Type: Grant
    Filed: September 28, 1995
    Date of Patent: October 20, 1998
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Katsuyoshi Kondoh, Yoshishige Takano
  • Patent number: 5822674
    Abstract: A material for electric contacts based on silver-tin oxide is obtained by mixing a powder of silver or an alloy mainly containing silver with a powder consisting mainly of tin oxide and 0.01 to 10 wt. % (in relation to the quantity of tin oxide) of an additive consisting of one or more compounds containing silver, oxygen and a metal from sub-groups II to VI of the periodic system and/or antimony, bismuth, germanium, indium and gallium, compacting the mixture and sintering it. The tin oxide may be replaced by zinc oxide.
    Type: Grant
    Filed: May 18, 1995
    Date of Patent: October 13, 1998
    Assignee: Doduco GmbH + Co. Dr. Eugen Durrwachter
    Inventors: Volker Behrens, Thomas Honig
  • Patent number: 5808213
    Abstract: Silver-iron materials for electrical switching contacts with properties which come very close to those of silver-nickel materials formed of 4.6 to 15% by weight iron and 0.05 to 5% by weight of one or more of the oxides magnesium oxide, calcium oxide, yttrium oxide, lanthanum oxide, cerium oxide, chromium oxide, iron oxide, aluminum oxide, indium oxide, silicon oxide, and tin oxide, the balance being silver.
    Type: Grant
    Filed: November 19, 1996
    Date of Patent: September 15, 1998
    Assignee: Degussa Aktiengesellschaft
    Inventors: Wolfgang Weise, Willi Malikowski, Roger Wolmer, Peter Braumann, Andreas Koffler
  • Patent number: 5798468
    Abstract: An electrical contact material for switching rated currents between 20 and 100 Ampere having improved operational life made of 3.2 to 19.9 wt-% tin oxide and 0.05 to 0.4 wt-%, in each case, of indium oxide and bismuth oxide, the remainder being silver. In the course of the manufacture of the material by powder metallurgy more than 60 wt-% of the tin oxide should exhibit a particle size of more than 1 .mu.m.
    Type: Grant
    Filed: January 31, 1996
    Date of Patent: August 25, 1998
    Assignee: Degussa Aktiengesellschaft
    Inventors: Wolfgang Weise, Roger Wolmer, Peter Braumann
  • Patent number: 5796017
    Abstract: Contact material based on silver, use of such a contact material in a switching device in power engineering, and process for preparing the contact material.For contact pieces in low-voltage switches, in particular, substitute materials based on silver-iron oxide are proposed for the silver-nickel hitherto often used in practice. According to the invention, such a material contains, as a further effective component, an oxide of a metal of the third sub-group, yttrium oxide (Y.sub.2 O.sub.3) being especially designed for this purpose. For example, a material of the composition Ag/Fe.sub.2 O.sub.3 10/Y.sub.2 O.sub.3 1 meets, with its favourable temperature behaviour, the properties required with respect to the contact property spectrum. In addition, at least one metal oxide which contains elements of the sixth sub-group of the Periodic Table of the Elements, preferably iron tungstate (FeWO.sub.4), can be present. In particular, a material of the composition Ag/Fe.sub.2 O.sub.3 9/Y.sub.2 O.sub.3 1/FeWO.sub.4 0.
    Type: Grant
    Filed: February 23, 1996
    Date of Patent: August 18, 1998
    Assignee: Siemens Aktiengesellschaft
    Inventor: Franz Hauner
  • Patent number: 5763105
    Abstract: A sintered contact material comprising silver and nickel is characterized according to the invention in that the mass fraction of nickel is between 5 and 50%, and in that the nickel is present in the silver microstructure with average particle sizes (d) 1 .mu.m<d<10 .mu.m in largely homogeneous dispersion. A suitable method for preparing said sintered contact material is characterized in that, prior to sintering the nickel is introduced, in the way of mechanical alloying, into the silver microstructure, this operation taking place under an air atmosphere. Contact facings manufactured therefrom can be formed as strips or sections by means of extrusion, as individual contact pieces by means of a shaped part technique, and in each case as a two-layer structure.
    Type: Grant
    Filed: June 21, 1996
    Date of Patent: June 9, 1998
    Assignee: Siemens Aktiengesellschaft
    Inventor: Claudia Peuker
  • Patent number: 5760331
    Abstract: A projectile, such as a bullet, is made by combining two different metals in proportions calculated to achieve a desired density, without using lead. A base constituent, made of a material having density greater than lead, is combined with a binder constituent having less density. The binder constituent is malleable and ductile metallic phase material that forms projectile shapes when subjected to a consolidation force, such as compression. The metal constituents can be selected, rationed, and consolidated to achieve desired frangibility characteristics.
    Type: Grant
    Filed: December 6, 1996
    Date of Patent: June 2, 1998
    Assignee: Lockheed Martin Energy Research Corp.
    Inventors: Richard A. Lowden, Thomas M. McCoig, Joseph B. Dooley
  • Patent number: 5728194
    Abstract: Silver-iron materials for electrical switching contacts with properties which come very close to those of silver-nickel materials formed of 0.5 to 20% by weight iron 0.5 to 5% by one or more of the elements rhenium, iridium, and ruthenium, and 0.05 to 2% by weight of one or more of the oxides magnesium oxide, calcium oxide, yttrium oxide, lanthanum oxide, titanium oxide, zirconium oxide, hafnium oxide, cerium oxide, niobium oxide, tantalum oxide, chromium oxide, manganese oxide, iron oxide, zinc oxide, copper oxide, aluminum oxide, indium oxide, silicon oxide, and tin oxide, the balance being silver.
    Type: Grant
    Filed: November 19, 1996
    Date of Patent: March 17, 1998
    Assignee: Degussa Aktiengesellschaft
    Inventors: Wolfgang Weise, Willi Malikowski, Roger Wolmer, Peter Braumann, Andreas Koffler
  • Patent number: 5714700
    Abstract: This invention provides a self-lubricating composite material which has excellent strength and oxidation resistnce at a high temperature and can be used in air and in vacuum, and a production method thereof, the composite material is a Cu--Ni--Sn type composite sintered body containing 20 to 70 vol % of mixed particles of graphite and WS.sub.2 as the solid lubricant components and having a porosity of not greater than 25 vol %, and a matrix is a two-phase alloy comprising Cu--Ni alloy particles and an Sn single phase or an Sn--Ni intermetallic compound dispersed uniformly in the grain boundary of the alloy particles and firmly bonding them, and this matrix encompasses the solid lubricant particles. The matrix consists of 5 to 40 wt % of Ni, 4 to 15 wt % of Sn and the balance of Cu and unavoidable impurities as the alloy composition.
    Type: Grant
    Filed: December 18, 1996
    Date of Patent: February 3, 1998
    Assignee: Nippon Steel Corporation
    Inventors: Tokuhiko Nishida, Shoichi Sekiguchi, Toru Ono, Yuko Tsuya
  • Patent number: 5698008
    Abstract: A contact material for a vacuum valve including, a conductive constituent including at least copper, an arc-proof constituent including at least chromium and an auxiliary constituent including at least one selected from the group consisting of tungsten, molybdenum, tantalum and niobium. The contact material is manufactured by quench solidification of a composite body of the conductive constituent, the arc-proof constituent and the auxiliary constituent.
    Type: Grant
    Filed: February 21, 1995
    Date of Patent: December 16, 1997
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tsuneyo Seki, Tsutomu Okutomi, Atsushi Yamamoto, Takashi Kusano
  • Patent number: 5686676
    Abstract: The sinterability of a copper/tungsten green compact is improved by using copper oxide, tungsten oxide or both as the copper and/or tungsten source. Sinterability is further enhanced by including steam in the sintering atmosphere.
    Type: Grant
    Filed: May 7, 1996
    Date of Patent: November 11, 1997
    Assignee: Brush Wellman Inc.
    Inventors: David E. Jech, Juan L. Sepulveda, Anthony B. Traversone
  • Patent number: 5663500
    Abstract: Substitute materials are increasingly proposed for contact pieces in low-voltage switches, which until now frequently consisted of silver-nickel. In the case of such a substitute material which, besides silver, contains at least iron oxide (Fe.sub.2 O.sub.3 /Fe.sub.3 O.sub.4) and zirconium oxide (ZrO.sub.2) as active components, the making capacity with regard to the critical welding current is improved by an addition of a further oxide of the sixth subgroup of the Periodic System and/or of a mixed oxide that consists of iron oxide and the oxide of an element of the sixth subgroup of the Periodic System. In this connection, the further additive is, in particular, ferro-wolframate (FeWO.sub.4).
    Type: Grant
    Filed: June 20, 1996
    Date of Patent: September 2, 1997
    Assignee: Siemens Aktiengesellschaft
    Inventors: Franz Hauner, Manfred Muller, Gunter Tiefel
  • Patent number: 5624475
    Abstract: A composite material comprising a pure copper or dispersion strengthened copper matrix and a boron rich species, such as, but not limited to, elemental boron or boron carbide, for use in the fabrication of baskets that support spent nuclear fuel in nuclear waste containers. A method for manufacturing the composite material using powder metallurgy and hot extrusion.
    Type: Grant
    Filed: December 2, 1994
    Date of Patent: April 29, 1997
    Assignee: SCM Metal Products, Inc.
    Inventors: Anil V. Nadkarni, Jack D. Troxell
  • Patent number: 5623725
    Abstract: Process for producing very pure platinum materials dispersion-reinforced with Y.sub.2 O.sub.3 and having high strength and extensibility, even in the temperature range >800.degree. C., from platinum powder by mechanical alloying, which comprises the process stepspreparing platinum powder of high purity and low particle size of from 2 to 10 .mu.m,introducing and dispersing Y.sub.2 O.sub.3 particles >1 .mu.m in the platinum powder by milling in a platinum vessel using milling media of zirconium oxide,degassing the milled product under a vacuum of better than 10.sup.-3 mbar and with an increase in temperature to at least 1200.degree. C. in a platinum capsule for a period of up to 48 hours,gastight welding of the evacuated capsule and hot isostatic pressing at 1350.degree. C.
    Type: Grant
    Filed: May 16, 1995
    Date of Patent: April 22, 1997
    Assignee: Schott Glaswerke
    Inventors: Joachim Disam, Gerhard Jangg, Johannes Zbiral, Gerhard Schreier, Christian Edtmaier
  • Patent number: 5610347
    Abstract: The invention relates to a material for electric contacts taking silver tin-oxide as basis, consisting of silver or mainly silver-containing alloy, tin oxide and other oxides or carbides of tungsten, molybdenum, vanadium, bismuth, titanium, and/or copper.
    Type: Grant
    Filed: February 21, 1995
    Date of Patent: March 11, 1997
    Assignee: Doduco GmbH & Co. Dr. Eugen Durrwachter
    Inventors: Volker Behrens, Thomas Honig, Andreas Kraus, Karl E. Saeger, Rainer Schmidberger, Theodor Staneff
  • Patent number: 5591926
    Abstract: A silver base electrical contact material is described which contains uniformly in a silver matrix dispersed particles of nickel, nickel oxide, and at least one additive selected from the group consisting of vanadium, manganese, chromium, thallium, titanium, cobalt, and tungsten carbide. The contact material contains 1.3 to 24.8 wt % of nickel, 0.2 to 4.7 wt % of nickel oxide, 0.05 to 3 wt % of the additive, and balance silver. A superior silver base contact material having excellent welding and wear resistances is obtained by adding the metals and the metal carbide to a silver-nickel-nickel oxide contact material.
    Type: Grant
    Filed: September 26, 1995
    Date of Patent: January 7, 1997
    Assignee: Matsushita Electric Works, Ltd.
    Inventors: Hayato Inada, Koji Tsuji
  • Patent number: 5589652
    Abstract: In the metallic member of the invention, ceramic super fine particles, and solid lubricant particles or short size fibers are dispersed, and the grain size of the ceramic particles is smaller than the solid lubricant particle size or fiber diameter.
    Type: Grant
    Filed: February 23, 1994
    Date of Patent: December 31, 1996
    Assignee: Hitachi, Ltd.
    Inventors: Toshiaki Arato, Yasuhisa Aono, Shigeo Tsuruoka, Katsuhiro Komuro
  • Patent number: 5564067
    Abstract: A trapping plug with unique characteristics provides phase separators for cryogenic storage systems for space applications. The plug has a body of high-thermal conductivity metal such as OFHC copper and a multiplicity of holes of uniform, extremely small diameter and uniformly spaced extending through the body. The hole diameters and their uniformity in size and spacing enable precise design of an operating system using disclosed criteria. Hole diameters at the range of interest for systems for long-term storage of cryogenics such as liquid hydrogen, that is, 0.1 to 5.0 microns, may be provided in the plugs. Multiple plugs or clusters of plugs disposed in a plate may be used as required. A storage system making use of the trapping plugs also includes external vent lines and a flow regulator that controls flow of vapor through the vent lines.
    Type: Grant
    Filed: May 29, 1990
    Date of Patent: October 8, 1996
    Assignee: Alabama Cryogenic Engineering, Inc.
    Inventor: John B. Hendricks
  • Patent number: 5561829
    Abstract: A method of preparing a metal alloy product from a powder blend. The method comprising: (a) cold pressing a blend to form a compact, the metal blend comprising a metal powder phase and at least one reinforcement phase having a hardness greater than the metal phase; (b) heating the compact to form a preheated compact; and (c) hot working the heated compact. In a preferred method, the powder metal blend comprises 50 to 90 vol. % of an aluminum alloy powder and 10 to 50 vol. % of silicon carbide; the heating of the compact perforated in a nitrogen atmosphere to form a preheated compact; and the extruded hot compact is hot worked. Hot working may take the form of forging, rolling, upset forging, exuding, compacting or other processes known in the art.
    Type: Grant
    Filed: April 27, 1995
    Date of Patent: October 1, 1996
    Assignee: Aluminum Company of America
    Inventors: Ralph R. Sawtell, Warren H. Hunt, Jr., Thomas J. Rodjom, Erik J. Hilinski, John H. Milsom
  • Patent number: 5551970
    Abstract: A dispersion strengthened copper alloy and a method for producing the alloy are provided. The alloy preferably comprises aluminum, titanium and hafnium as alloying elements that are internally oxidized under controlled conditions to produce a dispersion strengthened copper material having good hardness and high conductivity. A method for reducing the adverse effects of hydrogen on such materials is also provided. The dispersion strengthened material can be useful in many applications, including welding electrodes and electrical contacts.
    Type: Grant
    Filed: August 17, 1993
    Date of Patent: September 3, 1996
    Assignee: Otd Products L.L.C.
    Inventor: Evgeny P. Danelia
  • Patent number: 5540750
    Abstract: A friction material for a lubricated tribological system, particularly for a synchro of a gear box, consists of a bronze or steel matrix containing from 5 to 40% by weight of embedded hard particles. A 90% portion of the embedded hard particles have a particle size of from 50 and 300 micrometers. These hard particles consist of an alloy including Cr, Mo, W, V, Ni, Zr, Al and/or Ti and carbides of Cr, Mo, W and V; nitrides of Al and Mo; and/or oxides of Cr, Ni, Zr and Ti. The hardness of the hard particles is advantageously above 600 HV 0.1. This friction material has a comparatively high friction coefficient which is constant independent of variations of sliding speed.
    Type: Grant
    Filed: May 19, 1994
    Date of Patent: July 30, 1996
    Assignee: Sintermetal, S.A.
    Inventors: Antonio R. Fernandez, Pascal Belair, Seyed H. R. Ghaem Magham Farahni
  • Patent number: 5460639
    Abstract: The invention concerns bronze-based sintered contact components for use as slide components such as clutches and brakes and is intended to provide a sintered component comprising hard particles admixed with and finely and uniformly distributed in a Cu-Sn alloy matrix to provide improved friction coeffiient, and in which the disperesed hard particls are inhibited from coming off the Cu-Sn alloy matrix during contact movement so that the sintered omponent is possessed of good friction contact chracteristics and improved mechanical properties. A sintered contact component comprising Sn, and iron-based intermetallic compound as a hard particle ingredient, and a solid lubricating ingredient which have been passed through the process of mechanical alloying, mechanical grinding or pelletizing, the Sn, iron-based intermetallic compound, and solid lubricating ingredient being uniformly dispersed in a Cu matrix.
    Type: Grant
    Filed: August 4, 1994
    Date of Patent: October 24, 1995
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Katsuyoshi Kondoh
  • Patent number: 5458702
    Abstract: Alloy powder which is low in price and is unlikely to be oxidized on the surface, and a dispersion-type conductor using the alloy powder in which electromigration is not likely to occur. Melt of copper and silver is cooled at a high cooling speed of 10.sup.5 .degree. C./s or higher. Alloy powder having a composition expressed by a chemical formula Cu.sub.x Ag.sub.1-x (where 0.80.ltoreq.X.ltoreq.0.99) is obtained. Also, a dispersion-type conductor is produced by dispersing 100 parts by weight of the alloy powder in between 5-100 parts by weight of a binder. Thus, the low-priced alloy powder and the dispersion-type conductor of high quality and high reliability can be obtained.
    Type: Grant
    Filed: June 24, 1993
    Date of Patent: October 17, 1995
    Assignees: Alps Electric Co., Ltd., Teikoku Piston Ring Co., Ltd., Akihisa Inoue, Tsuyoshi Masumoto
    Inventors: Yasuichi Ono, Akihiro Makino, Akihisa Inoue, Tsuyoshi Masumoto, Yoshio Harakawa
  • Patent number: 5455738
    Abstract: A circuit card assembly thermal core includes a composite material that includes particles of diamond and a conductive metal such as aluminum, copper, nickel and beryllium and which may be made by pressure infiltration casting. The diamond particles are 110 to 160 microns in size and 10 to 80 percent by volume, and preferably 140 to 160 microns in size and 40 to 60 percent by volume. The composite material has both a high thermal conductivity and low density which may be matched with the coefficient of thermal expansion of other materials with which used.
    Type: Grant
    Filed: July 28, 1993
    Date of Patent: October 3, 1995
    Assignee: E-Systems, Inc.
    Inventors: Mark J. Montesano, John T. Wigand, Joseph C. Roesch
  • Patent number: 5443616
    Abstract: A dimensionally stable hydride composition and a method for making such a composition. The composition is made by forming particles of a metal hydride into porous granules, mixing the granules with a matrix material, forming the mixture into pellets, and sintering the pellets in the absence of oxygen. The ratio of matrix material to hydride is preferably between approximately 2:1 and 4:1 by volume. The porous structure of the granules accommodates the expansion that occurs when the metal hydride particles absorb hydrogen. The porous matrix allows the flow of hydrogen therethrough to contact the hydride particles, yet supports the granules and contains the hydride fines that result from repeated absorption/desorption cycles.
    Type: Grant
    Filed: July 14, 1993
    Date of Patent: August 22, 1995
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventor: James W. Congdon
  • Patent number: 5443615
    Abstract: A method of producing a molded ceramic article comprises the first step mixing powdery raw materials and a liquid additive, thereby obtaining a mixed raw material, the second step press-molding the mixed raw material obtained in the first step in a hydrostatically applied condition of pressure, thereby removing an excess of the liquid additive to obtain a preform, and the third step calcining the preform obtained in the second step to obtain a molded ceramic article. The molded ceramic article comprises, as a principal component, copper and, as essential components, Cr and Ni within composition ranges of 0.1.ltoreq.Cr<2 wt. % and 0.1.ltoreq.Ni<10 wt. % and further at least one additive component selected from the group consisting of the following composition ratios: the following composition ratios: 0<Fe<5 wt. %, 0.ltoreq.Co<5 wt. %, 0.ltoreq.Al<10 wt. % 0.ltoreq.Ti<20 wt. %, 0.ltoreq.Mo<3 wt. %, 0.ltoreq.Si<3 wt. % 0.ltoreq.V<3 wt. % 0.ltoreq.Mg<1 wt. % and 0.ltoreq.
    Type: Grant
    Filed: October 22, 1992
    Date of Patent: August 22, 1995
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Mitsuo Kuwabara, Kiyoshi Ikegami, Teruaki Yoshida, Koji Takahashi, Tamotsu Harada, Takeshi Komiyama, Fumio Hirai, Masamichi Hayashi
  • Patent number: 5441579
    Abstract: A method of embrittling cleaned steel particles is described, followed by a grinding and sorting operation. Depending on the initial carbon content of the steel scrap, a reducing and carbon-containing atmosphere may be provided to carburize the particles as they are being embrittled. A quenching operation is provided at the end of the process to embrittle the particles and before the particles are ground. The ground grit which is produced may then be sorted by size and used as an abrasive compound, or, alternatively may be further ground and annealed in a subsequent operation to provide suitable powder for forming sintered parts. Prior to annealing the grit may be further ground in a partial oxidizing atmosphere to preoxidize the powder, in order to provide oxygen directly within the powder to react with any residual carbon so that the carbon monoxide gas can be formed and the powder can be substantially free of both carbon and oxides when the reaction is complete.
    Type: Grant
    Filed: July 28, 1993
    Date of Patent: August 15, 1995
    Inventors: Sydney M. Kaufman, Stephen E. LeBeau
  • Patent number: 5435828
    Abstract: A dispersion-strengthened copper alloy is disclosed having an exceptional combination of strength, ductility, and thermal conductivity. The copper alloy comprises: copper, 0.01 to 2.0 weight % boron and 0.1 to 6.0 weight % cobalt, and cobalt-boride disperoids that range in size between 0.025 and 0.25 microns in diameter. A copper alloy is made by rapid solidification of the melt into a powder. Strong, thermally conductive articles can be made by compacting the powder at temperatures below the melting temperature of the copper alloy.
    Type: Grant
    Filed: December 21, 1993
    Date of Patent: July 25, 1995
    Assignee: United Technologies Corporation
    Inventor: James S. Andrus
  • Patent number: 5429656
    Abstract: In particular for contacts in low-voltage switches, the contact material consists of silver and further active components. In accordance with the invention, there are present as active components, in combination, iron oxide (Fe.sub.2 O.sub.3 /Fe.sub.3 O.sub.4) in a proportion of between 1 and 50% by weight and at least one oxide of a further chemical element in a proportion of between 0.01 and 5% by weight. In particular, contact materials of the constitution AgFe.sub.2 O.sub.3 ReO.sub.2 and AgFe.sub.2 O.sub.3 ZrO.sub.2 have proven suitable in practice. The manufacture of the material and fabricating of the contacts can be effected by methods of powder metallurgy with the inclusion of molding or extrusion technique.
    Type: Grant
    Filed: November 24, 1993
    Date of Patent: July 4, 1995
    Assignee: Siemens Aktiengesellschaft
    Inventors: Franz Hauner, Gunter Tiefel
  • Patent number: 5409519
    Abstract: A contacts material for a vacuum valve including an arc-proof constituent having at least one component selected from the group consisting of tantalum, niobium, tungsten and molybdenum and an auxiliary constituent having at least one component selected from the group consisting of chromium, titanium, yttrium, zirconium, cobalt and vanadium. The contact material further includes a conductive constituent having at least one component selected from the group consisting of copper and silver. The amount of the arc-proof constituent is from 25% to 75% by volume. The total amount of the arc-proof constituent together with the auxiliary constituent is no more than 75% by volume. The amount of the conductive constituent is the balance.
    Type: Grant
    Filed: May 28, 1993
    Date of Patent: April 25, 1995
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tsuneyo Seki, Tsutomu Okutomi, Atsushi Yamamoto