Boron(b) Containing Particles Patents (Class 75/254)
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Patent number: 5401292Abstract: A carbonyl iron powder (CIP) premix composition suitable for metal injection molding is provided herein. The composition comprises (a) CIP having a particle size in the range of about 0.2-7 microns, preferably about 0.2-5 microns, and a narrow particle size distribution; and (b) an alloying material, having a particle size in the range of about 0.02 to 5 microns, preferably about 0.03 to 3.0 microns, and a narrow particle size distribution, comparable to the CIP, and present in an amount of about 0.1-60% by weight of the composition, preferably 0.5-50%. The alloy material substantially covers the surface of the iron particles and is adhered thereto by attractive forces. Preferably the alloy material includes elemental metal powders which are smaller in particle size than the CIP.The premix composition is prepared by intensive mixing of its powder components, e.g.Type: GrantFiled: August 3, 1992Date of Patent: March 28, 1995Assignee: ISP Investments Inc.Inventor: Joseph E. Japka
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Patent number: 5393483Abstract: A nickel based superalloy composition is disclosed that provides increased high temperature stress-rupture strength and improved resistance to fatigue crack propagation at elevated temperatures up to about 760.degree. C. The composition is comprised of, by weight percent, about 10% to 12% chromium, about 17% to 19% cobalt, about 1.5% to 3.5% molybdenum, about 4.5% to 6.5% tungsten, about 3.25% to 4.25% aluminum, about 3.25% to 4.25% titanium, about 2.5% to 3,5% tantalum, about 0.02% to 0.08% zirconium, about 0.005% to 0.03% boron, less than 0.1% carbon, and the balance essentially nickel. Thermomechanical processing including isothermal forging at controlled strain rates and temperature ranges, supersolvus annealing, and slow cooling are disclosed for producing an enlarged grain structure that provides the improved properties in the alloy of this invention.Type: GrantFiled: April 2, 1990Date of Patent: February 28, 1995Assignee: General Electric CompanyInventor: Keh-Minn Chang
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Patent number: 5368630Abstract: An improved metallurgical powder composition capable of being compacted at elevated temperatures is provided comprising an iron-based powder, an alloying powder, a high temperature compaction lubricant, and a binder. The selected binders of this invention permit the bonded powder composition to achieve increased compressibility in comparison to unbonded powder compositions while reducing dusting and segregation of the alloying powder.Type: GrantFiled: April 13, 1993Date of Patent: November 29, 1994Assignee: Hoeganaes CorporationInventor: Sydney Luk
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Patent number: 5358547Abstract: A wear resistant coating includes a mixture or compound of Cobalt and Phosphorous either alone or mixed with one or more alloys to provide a coating for metallic surfaces rendering the metallic surfaces more resistant to wear. A preferred combination of Cobalt and Phosphorous utilized in the present invention consists of 89%, by weight, Cobalt and 11%, by weight, Phosphorous, which combination is at approximately the "eutectic" ratio, that is, that combination of Cobalt and Phosphorous exhibiting the lowest melting point. Preferred environments of application of the inventive coating include surgical blades, files and burrs, guide slots, drills and drill guides, surgical instruments and medical prostheses and for abrasive particles. The subject coatings have achieved a micro-hardness of 1500 DPH (Diamond Pyramid Hardness), approximately equal to the Rockwell C75 hardness.Type: GrantFiled: February 18, 1993Date of Patent: October 25, 1994Inventor: Kenneth H. Holko
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Patent number: 5356453Abstract: A mixed powder for powder metallurgy comprising a Fe powder and an alloy powder mixed together in which the mean particle size and the solidus line temperature of the alloy powder and the amount of the liquid phase formed during sintering are so defined as to attain most suitable sintering behavior, that is, the mean particle size of the alloy powder is smaller than 20 .mu.m, the solidus line temperature of the alloy powder is set to higher than 950.degree. C. and lower than 1300.degree. C. and the amount of the liquid phase formed during sintering is more than 20%. A sintered product having desired properties can be obtained by using the mixed powder described above.Type: GrantFiled: May 28, 1992Date of Patent: October 18, 1994Assignee: Kabushiki Kaisha Kobe Seiko ShoInventor: Jinsuke Takata
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Patent number: 5332422Abstract: A plasma sprayable powder for coating surfaces such as cylinder bores of an internal combustion engine, comprising grain size agglomerates of (i) a plurality of solid lubricant particles selected from the group consisting of graphite, MoS.sub.2, BN, CaF.sub.2, and LiF; and (ii) fusable ingredients adjacent the solid lubricant particles, the ingredients being air-hardenable upon friction-promoting-use, and the lubricants and fusable ingredients being agglomerated together by a low melting medium in the grains.A solid lubricant coating system for use with a metal interface subject to high temperatures and wet lubrication, comprising agglomerates of particles of (i) solid lubricant particles selected from the group consisting of graphite, boron nitride, molybdenum disulfide, lithium fluoride, NaF, WS.sub.Type: GrantFiled: July 6, 1993Date of Patent: July 26, 1994Assignee: Ford Motor CompanyInventor: V. Durga N. Rao
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Patent number: 5234510Abstract: An improved nickel-boron-silicon surfacing alloy containing an effective amount of phosphorous. Alloys of the present invention comprise: from about 0.20% to about 2.0% boron; from about 1.0% to about 5.0% silicon; and from about 0.5% to about 4.5% phosphorous, and contain a dendritic and two interdendritic phases.Type: GrantFiled: February 15, 1991Date of Patent: August 10, 1993Assignee: Wall Colmonoy CorporationInventor: Samuel C. DuBois
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Patent number: 5198137Abstract: An iron powder composition comprising an iron powder coated with a substantially uniform coating of a thermoplastic material and admixed with a boron nitride powder and a method of utilizing the mixture to produce a magnetic core component is provided. The iron powder mixture is formulated with up to about 1% by weight of boron nitride which reduces the stripping and sliding die ejection pressures during high temperature molding and also improves the permeability of the magnetic part over an extended frequency range.Type: GrantFiled: May 17, 1991Date of Patent: March 30, 1993Assignee: Hoeganaes CorporationInventors: Howard G. Rutz, Christopher Oliver, Brooks Quin
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Patent number: 5167914Abstract: An (Fe, Co)-B-R tetragonal type magnet having a high corrosion resistance, which has a boundary phase stabilized by Co and Al against corrosion, and which consists essentially of:0.2-3.0 at % Dy and 12-17 at % of the sum of Nd and Dy;5-10 at % B;0.5-13 at % Co;0.5-4 at % Al; andthe balance being at least 65 at % Fe.0.1-1.0 at % of Ti and/or Nb may be present. Alloy powders therefor can be also stabilized.Type: GrantFiled: May 22, 1991Date of Patent: December 1, 1992Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Setsuo Fujimura, Masato Sagawa, Hitoshi Yamamoto, Satoshi Hirosawa
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Patent number: 5122182Abstract: Two constituent powders of a powder blend for thermal spraying are in the form of composite particles containing subparticles of nickel alloy and benoite for clearance control coatings. The composite particles are formed by spray drying. In one embodiment the volume percentage of metal in one constituent powder is at least 25% greater than in the other powder. In another embodiment the difference is about 10% by volume, and the alloy rich constituent has alloy subparticles sufficiently large to act as core particles to which the finer subparticles of bentonite are bonded.Type: GrantFiled: May 2, 1990Date of Patent: June 16, 1992Assignee: The Perkin-Elmer CorporationInventors: Mitch R. Dorfman, Burton A. Kushner, Anthony J. Rotolico, Brian A. DelRe, Edward R. Novinski
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Patent number: 5080714Abstract: A compound for producing sintered parts in an injection molding process and the molding process used to form the parts. The compound contains materials that allow the parts to be formed at lower temperatures and higher production rates when compared to more conventional processes.Type: GrantFiled: July 18, 1990Date of Patent: January 14, 1992Inventors: Masakazu Achikita, Akihito Ohtsuka
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Patent number: 5055129Abstract: Permanent magnets are prepared by method comprising mixing a particulate rare earth-iron-boron alloy with a particulate transition metal, aligning the magnetic domains of the ixture, compacting the aligned mixture to form a shape, and sintering the compacted shape.Type: GrantFiled: June 18, 1990Date of Patent: October 8, 1991Assignee: Union Oil Company of CaliforniaInventor: Mohammad H. Ghandehari
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Patent number: 5030278Abstract: Process of restructuring a group of finely divided particles, of granulometries lower than 100 microns, wherein the particles to be restructured are placed in a bath of cryogenic liquid which is inert with respect to the particles, the operation of restructuring is allowed to proceed after which the cryogenic liquid is withdrawn for example by evaporation. Applications to the production of metallic alloys, special polymers, paints, inks, carbon black, special ceramics and pharmaceutical or food products.Type: GrantFiled: April 12, 1990Date of Patent: July 9, 1991Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des ProcedesInventor: Pierre Karinthi
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Patent number: 5026419Abstract: Anisotropic hot-worked permanent magnets are made from an R-T-B alloyed powder to which is added a combination internal lubricant including a carbon-based material such as graphite and a glass material such as glass from the B.sub.2 O.sub.3 --SiO.sub.2 --BiO.sub.3 glass system. The internal lubricant provides improved formability during the hot-working step, such as die-upsetting, and provides finished magnet products wherein the individual grains are more uniformly plastically deformed throughout the product.Type: GrantFiled: April 25, 1990Date of Patent: June 25, 1991Assignee: Hitachi Metals, Ltd.Inventors: Katsunori Iwasaki, Shigeho Tanigawa, Masaaki Tokunaga
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Patent number: 5019454Abstract: Powders for producing hard materials in short reaction times are provided, especially for use in electric arc spraying. The powders are produced by bonding metallic and non-metallic starting materials to one another by spray-drying or agglomeration, using an organic or inorganic binder. The metallic starting materials are selected from the group consisting of Al, Ni, Ti, Cr, Mo, V, Zr and Ta, whereas the non-metallic starting materials are selected from the group consisting of Cr.sub.3 C.sub.2, WC, C, SiC, TiB.sub.2, CrB.sub.2, B.sub.4 C, TiC, VC, TiN and Si.sub.3 N.sub.4. In this manner, the metallic and non-metallic starting materials react exothermically during electric arc spraying to produce a hard substance.Type: GrantFiled: July 20, 1988Date of Patent: May 28, 1991Inventor: Karl-Hermann Busse
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Patent number: 5004499Abstract: Permanent magnets are prepared by a method comprising mixing a particulate rare earth-iron-boron alloy with a particulate additive metal powder, compacting the aligned mixture to form a shape, and heating the compacted shape at a temperature at least 150.degree. C. less than the sintering temperature of a rare earth-iron-boron alloy and usually in the range from about 700.degree. C. to less than 850.degree. C.Type: GrantFiled: May 26, 1989Date of Patent: April 2, 1991Assignee: Union Oil Company of CaliforniaInventor: Mohammad H. Ghandehari
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Patent number: 4981513Abstract: Permanent magnets are prepared by a method comprising mixing a particulate rare earth-iron-boron alloy with a particulate transition metal, aligning the magnetic domains of the mixture, compacting the aligned mixture to form a shape, and sintering the compacted shape.Type: GrantFiled: May 11, 1987Date of Patent: January 1, 1991Assignee: Union Oil Company of CaliforniaInventor: Mohammad H. Ghandehari
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Patent number: 4976778Abstract: The present invention relates to an infiltrated ferrous powder metal part containing certain additives, yielding a part having improved dimensional control during infiltration and uniform and predictable distribution of dynamic properties within a given group of commonly manufactured parts.Type: GrantFiled: June 23, 1988Date of Patent: December 11, 1990Assignee: SCM Metal Products, Inc.Inventors: David F. Berry, Erhard Klar, Mark Svilar
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Patent number: 4933009Abstract: Permanent magnets are prepared by a method comprising mixing a particulate rare earth-iron-boron alloy with a particulate rare earth oxide, aligning the magnetic domains of the mixture, compacting the aligned mixture to form a shape, and sintering the compacted shape.Type: GrantFiled: June 3, 1988Date of Patent: June 12, 1990Assignee: Union Oil Company of CaliforniaInventor: Mohammad H. Ghandehari
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Patent number: 4927461Abstract: The machinability characteristics of P/M ferrous sintered compacts are improved when the compact is prepared from a ferrous powder having a maximum particle size less than about 300 microns, and from at least about 0.01 weight percent of a boron nitride powder comprising agglomerates of irregular-shaped, submicron particles.Type: GrantFiled: November 2, 1988Date of Patent: May 22, 1990Assignee: Quebec Metal Powders, Ltd.Inventors: Cavit Ciloglu, Martin Gagne, Edy Laraque, Joel Poirier, Sylvain Tremblay, Yves Trudel
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Patent number: 4923533Abstract: A powder comprising flakes of magnetically soft amorphous alloy having an average thickness of 0.01-1 .mu.m and an aspect ratio of 10-10,000 is blended with a binder to form a coating composition from which a magnetic shield is fabricated. The alloy is basically an Fe-B-Si ternary alloy in which iron may be partially replaced by another metal.Type: GrantFiled: July 29, 1988Date of Patent: May 8, 1990Assignees: TDK Corporation, Tokyo Magnetic Printing Company, Ltd.Inventors: Masao Shigeta, Tsutomu Choh, Hiroyoshi Shimizu, Ippo Hirai, Shohei Mimura, Atsushi Makimura, Hiroshi Hosaka
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Patent number: 4909840Abstract: A process for the production of a secondary powder composition having a nanocrystalline structure and being comprised of binary or quasi-binary substances composed of at least one of the elements Y, Ti, Zr, Hf, Nb, Mo, Ta and W and at least one of the elements V, Cr, Mn, Fe, Co, Ni, Cu and Pd, optionally also containing further ingredients, such as Si, Ge, B and/or oxides, nitrides, borides, carbides, and their possible mixed crystals. The components are in powdered form and are mixed in elementary form or as pre-alloys and have particle sizes ranging from 2 to 250 .mu.m. The powder components are subjected to high mechanical forces in order to produce secondary powders having a nanocrystalline structure. The secondary powders obtained in this way can be processed into molded bodies according to known compression molding processes, but at a temperature below the recrystallization temperature.Type: GrantFiled: April 7, 1988Date of Patent: March 20, 1990Assignee: Fried. Krupp Gesellschaft mit beschrankter HaftungInventor: Wolfgang Schlump
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Patent number: 4904424Abstract: Ceramic alloys or solid solutions are formed by dispersing a powdery metal alloy or intimate mixture of two alloying metals in a precarbonaceous polymer such as polyacrylonitrile, forming the mixture into a molded article such as fibers, and heating the molded articles at a temperature and in a pyrolyzation atmosphere sufficient to carbonize the polymer and cause reaction of the metals with carbon and/or the pyrolyzation gas.Type: GrantFiled: May 29, 1987Date of Patent: February 27, 1990Assignee: Hoechst Celanese CorporationInventor: Robert E. Johnson
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Patent number: 4824482Abstract: Diffusion aluminizing, when applied to titanium is effected with little or no activator to produce more uniform case and less etching.Workpieces are very rapidly pack-diffusion coated by using an excess of energizers in the pack, heating the retort containing the packed workpieces at a rate that brings the workpieces to diffusion-coating temperature and then completing the diffusion coating, all in less than 50 minutes, then cooling the retort.Diffusion aluminizing can also be applied to foils and powder to make pyrophoric product after leaching out much of the introduced aluminum. Powder can also be diffusion boronized. Pyrophoric boron-containing iron or nickel powder mixed with Ba(NO.sub.3).sub.2 will ignite to cause generation of large quantity of NO.sub.2 gas, and generation is improved when powdered boron and/or an oxidizer like NaClO.sub.3 is added.Type: GrantFiled: March 4, 1985Date of Patent: April 25, 1989Assignee: Alloy Surfaces Company, Inc.Inventor: Alfonso L. Baldi
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Patent number: 4810464Abstract: An iron-base, hard facing alloy characterized by the absence of cobalt but having performance characteristics approximating cobalt-base, hard surfacing alloys. The alloys consist essentially of, by weight, from about 3% to about 5% boron, up to about 10% chromium, from about 27% to about 43% nickel, from about 0.1% to about 5% silicon, from about 0.2% to about 1.5% carbon, from about 0.1% to about 2% manganese, with iron comprising the balance.Type: GrantFiled: May 11, 1987Date of Patent: March 7, 1989Assignee: Wear Management ServicesInventors: Richard S. Szereto, Richard O. Drossman
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Patent number: 4755221Abstract: Composite powder particles which are essentially spherical in shape are disclosed which consist essentially of particles of a matrix phase which consists essentially of a metal selected from the group consisting of aluminum and aluminum based alloys and a reinforcement phase which is relatively uniformly dispersed in and bonded to the matrix, the reinforcement phase comprising titanium diboride.A process is disclosed for producing the above composite particles which involves entraining in a carrier gas a plurality of agglomerated powders, at least one of the powders supplying aluminum, at least one of the powders supplying titanium without boron and at least one of the powders supplying boron without titanium. The powders are fed through a high temperature zone to cause essentially complete melting and coalescence of the powders wherein at least a part of the titanium and at least a part of the boron combine to form titanium diboride and thereafter resolidified to form the composite powder particles.Type: GrantFiled: March 24, 1986Date of Patent: July 5, 1988Assignee: GTE Products CorporationInventors: Muktesh Paliwal, Walter A. Johnson
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Patent number: 4747874Abstract: Permanent magnets are prepared by a method comprising mixing a particulate rare earth-iron-boron alloy with particulate aluminum, aligning the magnetic domains of the mixture, compacting the aligned mixture to form a shape, and sintering the compacted shape.Type: GrantFiled: May 30, 1986Date of Patent: May 31, 1988Assignee: Union Oil Company of CaliforniaInventor: Mohammad H. Ghandehari
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Patent number: 4678511Abstract: The present invention provides improved spray micropellets having a particle size of 5-150 .mu.m mainly composed of micropellets of high carbon ferrochrome alloy fine powder having an average particle of 0.5-20 .mu.m, mainly containing Cr 20-80 wt. %, Fe 15-75 wt. %, C 5-10 wt. %, Si less than 10 wt. % and Ti and Mn as unavoidable impurities.The spray micropellets are particularly useful for sliding parts having high sealing effects such as pistons and the like.Type: GrantFiled: September 5, 1985Date of Patent: July 7, 1987Assignee: Awamura Metal Industry Co., Ltd.Inventors: Junichi Yasuoka, Sumio Kamiyama, Kiyomi Ashida, Ryozo Hata
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Patent number: 4671932Abstract: In order to obtain, in a hard alloy based on a nickel-chromium-boron-silicon alloy, particularly advantageous properties with regard to hardness and toughness, carbides of the elements vanadium, niobium, tantalum and/or chromium are added to the hard alloy.Type: GrantFiled: April 27, 1984Date of Patent: June 9, 1987Assignee: Herman C. Starck BerlinInventors: Reinhold Lutz, Helgo Wendt, deceased, Helmut Meinhardt, Heinz Eschnauer, E. Lugscheider
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Patent number: 4626281Abstract: A composition of matter having a Rockwell A hardness of at least 85 is formed from a precursor mixture comprising between 3 and 10 weight percent boron carbide and the remainder a metal mixture comprising from 70 to 90 percent tungsten or molybdenum, with the remainder of the metal mixture comprising nickel and iron or a mixture thereof. The composition has a relatively low density of between 7 to 14 g/cc. The precursor is preferably hot pressed to yield a composition having greater than 100% of theoretical density.Type: GrantFiled: May 7, 1985Date of Patent: December 2, 1986Assignee: The United States of America as represented by the United States Department of EnergyInventor: Haskell Sheinberg
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Patent number: 4619699Abstract: Disclosed are dispersion strengthened composite metal powders having an average particle size of less than about 50 microns and an average grain size within the particle of about 0.05 to 0.6 microns.Type: GrantFiled: May 2, 1985Date of Patent: October 28, 1986Assignee: Exxon Research and Engineering Co.Inventors: Ruzica Petkovic-Luton, Joseph Vallone
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Patent number: 4610726Abstract: A cermet is produced by providing a bulk reaction mixture of particulate reactants plus elemental metal, which reaction mixture is in admixture with a ceramic diluent that is the same as ceramic material formed during sintering of the reaction mixture. Sintering produces a boride-oxide ceramic with the oxide being a metal oxide of the elemental metal. However, the elemental metal is present in the reaction mixture in substantial excess over that amount stoichiometrically required. Sintering is conducted under inert atmosphere, generally after pressing. The invention is particularly directed to boride-based ceramics containing aluminum, which materials are suitable as components of electrolytic cells for the production of aluminum by molten salt electrolysis.Type: GrantFiled: June 29, 1984Date of Patent: September 9, 1986Assignee: Eltech Systems CorporationInventor: Harry L. King
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Patent number: 4584078Abstract: A method of producing fine particles with a particle size of submicron or finer which comprises the steps of:forming closely fine projections on a substrate surface, preferably by sputter-etching using an ionized gas; and thensputtering metallic or non-metallic materials onto the thus treated substrate in an inert gas or a mixed gas of an inert gas and a reactive gas, such as oxygen, the gas pressure of the inert gas or the mixed gas being in the range of from 1.times.10.sup.-4 torr to 1.times.10.sup.-1 torr, and thereby depositing the purposed fine particles in crystalline or amorphous form. The invention method can successfully provide fine particles with desired properties, for example, in size, shape and structure, by adjusting producing conditions or selection of substrate materials and the thus obtained fine particles are very useful in various applications with or without the substrate.Type: GrantFiled: August 1, 1984Date of Patent: April 22, 1986Assignees: Yukio Nakanouchi, Shigehiro Ohnuma, Tsuyoshi Masumoto, Research Development Corporation of JapanInventors: Yukio Nakanouchi, Shigehiro Ohnuma, Tsuyoshi Masumoto
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Patent number: 4576873Abstract: Hardfacing of metal parts employing a thin, homogeneous ductile foil is disclosed. The hardfacing foil has a composition consisting essentially of about 0 to about 25 atom percent cobalt, 0 to about 30 atom percent nickel, 0 to about 30 atom percent chromium, 0 to about 5 atom percent tungsten, 0 to about 4 atom percent molybdenum, about 2 to about 25 atom percent boron, 0 to about 15 atom percent silicon, and 0 to about 5 atom percent carbon, the balance being iron and incidental impurities with the proviso that the total of iron, cobalt, nickel, chromium, tungsten and molybdenum ranges from about 70 to 88 atom percent and the total of boron, silicon and carbon ranges from about 12 to 30 atom percent. The ductile foil permits continuous hardfacing of soft matrix, like low carbon and low alloy steels, imparting superior resistance to wear and corrosion.Type: GrantFiled: February 19, 1985Date of Patent: March 18, 1986Assignee: Allied CorporationInventors: Debasis Bose, Amitava Datta, Nicholas J. DeCristofaro, Claude Henschel
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Patent number: 4561891Abstract: A sintered silicon carbide body having a high thermal conductivity and a high electrical insulation without any drop substantially throughout the sintered body is produced from a powdery silicon carbide composition comprising at least 90% by weight of silicon carbide powders having an average particle size of not more than 10 .mu.m and 0.01 to 4% by weight of powders of beryllium or its compound having a particle size of not more than 30 .mu.m in terms of beryllium atom, a nitrogen content of the composition being not more than 500 ppm.Type: GrantFiled: October 5, 1983Date of Patent: December 31, 1985Assignee: Hitachi, Ltd.Inventors: Kunihiro Maeda, Katsuhisa Usami, Yukio Takeda, Satoru Ogihara, Osamu Asai
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Patent number: 4562040Abstract: The present invention relates to a method for manufacturing a high-strength sintered silicon carbide article and more particularly, to a method for a sintered silicon carbide article having high mechanical strength by mixing a finely divided silicon carbide powder with the definite amounts of a specific carbon-containing material, a boron compound and silicon powder as densification aids, shaping and then sintering said shaped article under an inert atmosphere.Type: GrantFiled: April 9, 1985Date of Patent: December 31, 1985Assignee: Sumitomo Aluminium Smelting Company, Ltd.Inventors: Koichi Yamada, Masahide Mouri, Yoshisaburo Nomura
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Patent number: 4526618Abstract: A coating composition applied to a substrate by a thermal spray process which comprises tungsten carbide and a boron-containing alloy or a mixture of alloys with a total composition of from about 6.0 to 18.0 weight percent boron, 0 to 6 weight percent silicon, 0 to 20 weight percent chromium, 0 to 5 weight percent iron and the balance nickel; the tungsten carbide comprising about 78 to 88 weight percent of the entire composition.Type: GrantFiled: October 18, 1983Date of Patent: July 2, 1985Assignee: Union Carbide CorporationInventors: Madapusi K. Keshavan, Merle H. Weatherly
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Patent number: 4515870Abstract: Hardfacing of metal parts employing a thin, homogeneous ductile foil is disclosed. The hardfacing foil has a composition consisting essentially of about 0 to about 25 atom percent cobalt, 0 to about 30 atom percent nickel, 0 to about 30 atom percent chromium, 0 to about 5 atom percent tungsten, 0 to about 4 atom percent molybdenum, about 2 to about 25 atom percent boron, 0 to about 15 atom percent silicon, and 0 to about 5 atom percent carbon, the balance being iron and incidental impurities with the proviso that the total or iron, cobalt, nickel, chromium, tungsten and molybdenum ranges from about 70 to 88 atom percent and the total of boron, silicon and carbon ranges from about 12 to 30 atom percent. The ductile foil permits continuous hardfacing of soft matrix, like low carbon and low alloy steels, imparting superior resistance to wear and corrosion.Type: GrantFiled: September 19, 1984Date of Patent: May 7, 1985Assignee: Allied CorporationInventors: Debasis Bose, Amitava Datta, Nicholas J. DeCristofaro, Claude Henschel
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Patent number: 4512805Abstract: A process for the production of valve metal powder, which is doped with boron or boron compounds, for electrolytic capacitors having a low relative leakage current and a high specific charge. The doping with boron or boron compounds in amounts of up to 0.5 percent by weight, relative to the metal content, can take place either during the production of the metal powder or the green valve metal anodes.Type: GrantFiled: June 13, 1984Date of Patent: April 23, 1985Assignee: Hermann C. Starck BerlinInventors: Wolf-Wigand Albrecht, Uwe Papp, Dieter Behrens
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Patent number: 4450135Abstract: A method of preparing electrical contacts and electrical contact materials comprises the steps of blending a conductive metallic component, such as silver, with nickel and zirconium diboride which is substantially completely free of oxides, pressing the powder mixture to form a pre-sintered compact, and thereafter liquid phase sintering the compact to a densified body.The zirconium diboride is mixed with about 2 weight percent of a reducing agent, preferably mixed carbon and boron powders, and heated to remove oxides from the surface of the zirconium diboride powder particles prior to the steps of pressing and sintering.Type: GrantFiled: January 4, 1982Date of Patent: May 22, 1984Assignee: GTE Laboratories IncorporatedInventors: Thomas E. Peters, John C. Gustafson, Boon Wong
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Patent number: 4423097Abstract: A seal intended to wear from abrasion for use in contact with a rotor zone of a rotating machine, of the type made up of a dispersion of hollow microspheres in a binder providing cohesion of the microspheres among themselves and their attachment to a metallic support. In order to make it possible to produce the seal by torch spraying from a powdered mixture onto the support, the hollow microspheres are made of an inorganic refractory material and the binder material is a metallic material more fusible than the material of the microspheres.Type: GrantFiled: June 14, 1982Date of Patent: December 27, 1983Assignee: Societe Nationale D'Etude Et De Construction De Moteurs D'Aviation "S.N.E.C.M.A."Inventors: Claude M. Mons, Michel J. Pernot, Roland R. Spinat
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Patent number: 4402776Abstract: A compacted mixture of heat-generating powders including about 1 to 20 weight percent of silicon results in improved heat transfer to unreacted components or to the ambient during condensed state exothermic reaction to form intermetallic products. Gettering of expanding gases from impurities and incomplete compaction is also provided by the silicon addition, thereby increasing overall heat conductivity of the compact and further improving the heat transfer rate from the reacted region.Type: GrantFiled: August 22, 1980Date of Patent: September 6, 1983Assignee: Hughes Aircraft CompanyInventor: Patrick A. Whipps
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Patent number: 4299887Abstract: A temperature sensitive electrical element and method of making the same comprising the steps of applying to the surface of a substrate and firing a mixture of glass frit and particles of titanium dioxide (TiO.sub.2), and titanium metal. The mixture is fired in a non oxidizing, inert, or reducing atmosphere at a temperature which softens of the glass frit. When cooled, an element is provided with a glass film strongly bonded to the substrate and having dispersed therein conductive particles mainly of titanium oxide (Ti.sub.2 O.sub.3). The element produced can be terminated by the use of electroless plating and provides a substantially linear resistance to temperature characteristic and a relatively high temperature coefficient of resistance.Type: GrantFiled: May 7, 1979Date of Patent: November 10, 1981Assignee: TRW, Inc.Inventor: Robert G. Howell
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Patent number: 4271236Abstract: Air fireable nickel boride-based end termination compositions for multilayer capacitors are provided. The nickel boride compounds utilized are either (Ni.sub.3 B).sub.a (Ni.sub.3 Si).sub.b or Ni.sub.3 B.sub.1-x P.sub.x and the compositions also contain a glass whose component oxides have a redox potential of less than -0.5 volt. These compositions, upon firing, afford conductors such as end terminations in multilayer capacitors having excellent solderability and solder leach resistance, adhesion to dielectric substrates and electrical properties substantially equivalent to standard silver/palladium conductors.Type: GrantFiled: October 29, 1979Date of Patent: June 2, 1981Assignee: E. I. Du Pont de Nemours and CompanyInventor: Alfred A. D'Addieco
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Patent number: 4229217Abstract: The production of highly porous sintered bodies useful for the manufacture of electrolytic capacitors by using as a lubricant for the base metal powder, usually tantalum, about 0.01 to about 10% by weight of an inorganic lubricant, namely nitrides of boron or silicon.Type: GrantFiled: November 20, 1978Date of Patent: October 21, 1980Assignee: Hermann C. StarchInventor: Reinhard Hahn
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Patent number: 4194900Abstract: There is provided a hard alloyed powder comprising:B--from 3 to 20% by weight,Al--less than 3% by weight,Si--less than 5% by weight,O--less than 2.5% by weight,at least one metal selected from the group consisting of Cr, Mo, W, Ti, V, Nb, Ta, Hf, Zr, Co and Ni, in the following amounts: Cr from 5 to 35% by weight, Mo from 1 to 35% by weight, W from 0.5 to 30% by weight and each of Ti, V, Nb, Ta, Hf, Zr, Co and Ni--less than 15% by weight, andthe balance being at least 10% by weight of Fe.A method for the production of said alloy powder is also provided and comprises atomizing molten alloy with water or inert gas in a specific manner.Type: GrantFiled: October 5, 1978Date of Patent: March 25, 1980Assignee: Toyo Kohan Co., Ltd.Inventors: Tsuneyuki Ide, Ken-ichi Takagi, Michio Watanabe, Seiichi Ohhira, Masahito Fukumori, Yoshikazu Kondo
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Patent number: 4192672Abstract: A boron-containing nickel or cobalt spray-and-fuse self-fluxing alloy powder contains hard precipitates of chromium boride and, optionally, chromium carbide which are internally precipitated from a melt of said alloy. Such alloy powder is made by atomizing the melt at about the temperature at which the melt is viscous.Type: GrantFiled: January 18, 1978Date of Patent: March 11, 1980Assignee: SCM CorporationInventors: Larry N. Moskowitz, Erhard Klar
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Patent number: 4173685Abstract: Wear and corrosion resistant coatings are obtained using the plasma or d-gun techniques and applying a coating material consisting of carbides and nickel-containing base alloy having 6-18 wt.% boron.Type: GrantFiled: May 23, 1978Date of Patent: November 6, 1979Assignee: Union Carbide CorporationInventor: Merle H. Weatherly
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Patent number: 4098608Abstract: In a mixture of metal powders from which ferrous alloy articles may be made by the process of powder metallurgy, the mixture consisting of the following in percentages by weight; nickel, 0.5 to 4%, manganese, 0.5 to 6%, carbon (graphite), 0.05 to 1.5%, copper, if present, up to 5%, boron, if present, up to 0.4%, iron and usual impurities, balance to 100%, the improvement consisting in that the nickel and manganese are in the form of a powdered binary alloy having a nickel to manganese ratio by weight in the range 15 : 85 to 65 : 35 and all of said powdered alloy passes through a 400 mesh B.S.S. sieve.Type: GrantFiled: November 8, 1976Date of Patent: July 4, 1978Assignee: B.S.A. Sintered Components LimitedInventors: Michael Thomas Matty, Philip James Ridout
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Patent number: 4092158Abstract: A spray powder is provided for the manufacture of layers having a high resistance to wear and burn traces on the bearing surfaces of engine parts which are subject to friction. The spray powder consists essentially of a powder mixture of about 30 to about 80 weight percent iron, about 0.1 to about 60 weight percent of at least one Group VIB metal selected from the group consisting of molybdenum and tungsten, and about 4 to about 50 weight percent boron.Type: GrantFiled: November 28, 1975Date of Patent: May 30, 1978Assignee: Goetzewerke Friedrich Goetze AGInventors: Horst Beyer, Ulrich Buran