Oxide Containing Patents (Class 75/232)
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Patent number: 4602956Abstract: Composite cermets having a central core of a first cermet composition and one or more surrounding layers of different cermet compositions are formed by a multi-step pressing operation, followed by sintering. A tungsten/alumina or molybdenum/alumina composite cermet is useful as an end closure for alumina arc tubes of metal halide discharge lamps.Type: GrantFiled: December 17, 1984Date of Patent: July 29, 1986Assignee: North American Philips Lighting CorporationInventors: Deborah P. Partlow, Shih-Ming Ho
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Patent number: 4602954Abstract: A method of producing metallic strip containing discrete particles of one or more additional metallic or non-metallic materials dispersed therein, includes the step of forming a homogeneous mix of ductile metallic particles and a minor proportion of metallic and/or non-metallic particles having chemical and/or physical properties different from those of the ductile metallic particles. A slurry coating comprising a suspension of the mixed particles in a film forming cellulose derivative is deposited onto a moving support surface, dried and removed from the support surface before being subjected to rolling to effect compaction of the ductile content of the strip and sintering at a temperature at which the metallic particles coalesce to form a matrix containing particles of the additional metallic or non-metallic material(s) which either remain as discrete particles or alloy with the matrix.Type: GrantFiled: April 4, 1985Date of Patent: July 29, 1986Assignee: Mixalloy LimitedInventors: Idwal Davies, John Bellis
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Patent number: 4537323Abstract: Boron, oxygen, or a mixture thereof, is used as a sintering aid in sintering Mo-Ti alloys. Compounds formed between these sintering aids and the Mo or Ti have thermal expansion coefficients consistent with that of alloys of Mo and Ti. An hermetic member may be made using these constituents. The hermetic member may be used to seal an assembly such as a high pressure sodium lamp.Type: GrantFiled: January 9, 1984Date of Patent: August 27, 1985Assignee: GTE Laboratories IncorporatedInventors: Brian M. Ditchek, Thomas R. Middleton
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Patent number: 4509980Abstract: Electrical contacts of high density and high erosion resistance made by sintering a powder compact containing silver, cadmium oxide, cupric nitrate, or any other water soluble copper salt, and optionally silver oxide or silver oxide and barium hydroxide.Type: GrantFiled: May 19, 1983Date of Patent: April 9, 1985Assignee: Chemet CorporationInventor: Ernest M. Jost
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Patent number: 4497669Abstract: An alloy made by water atomizing the charge component into powder, extruding the powder, hot rolling the powder and heat treating the product. The alloy displays superior stress rupture characteristics when compared to a corresponding conventionally wrought alloy.Type: GrantFiled: July 22, 1983Date of Patent: February 5, 1985Assignee: Inco Alloys International, Inc.Inventors: Kathy K. Wang, Mark L. Robinson
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Patent number: 4484644Abstract: An embodiment of the article comprises a metallic body formed, by a powder metallurgy technique, of steel powder and tungsten carbide particles, and forged, having a total density of not less than one hundred percent. The method, then, comprises (a) the powder metallurgy steps of forming and sintering the body, and (b) the subsequent forging step, to produce the one hundred percent total density steel and tungsten carbide article.Type: GrantFiled: September 2, 1980Date of Patent: November 27, 1984Assignee: Ingersoll-Rand CompanyInventors: John P. Cook, Bani R. Banerjee
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Patent number: 4478787Abstract: A process and a product produced thereby, for forming rod or bar or tube stock or strip, comprising a sheath and a densified dispersion strengthened metal core. Powdered dispersion strengthened copper is put into a metal can and compressively reduced to size and density. The relationship between the tensile strength of the core when fully densified and the cold worked tensile strength of the can is important to the nature of the product.Type: GrantFiled: December 14, 1983Date of Patent: October 23, 1984Assignee: SCM CorporationInventors: Anil V. Nadkarni, Prasanna K. Samal, James C. Wang, James E. Sunk
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Patent number: 4450204Abstract: A two-layer contact having a silver backing and a silver cadmium oxide body which backing is relatively free of warpage and macroscopic voids is produced from a mixture of silver oxide, silver acetate and silver.Type: GrantFiled: June 17, 1982Date of Patent: May 22, 1984Assignee: GTE Products CorporationInventors: Han J. Kim, Richard C. Bevington
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Patent number: 4440572Abstract: A process for making a novel alloy of a dispersion strengthened copper by blending dispersion strengthened copper powder and a powdered modifying metal, heat treating the blend to form the alloy, and the compacting and working the compact to densify it.Type: GrantFiled: June 18, 1982Date of Patent: April 3, 1984Assignee: SCM CorporationInventors: Anil V. Nadkarni, Prasanna K. Samal
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Patent number: 4406699Abstract: The present invention relates to a metal-oxide ceramic composition useful in induction heating applications for treating uranium and uranium alloys. The ceramic composition is electrically conductive at room temperature and is nonreactive with molten uranium. The composition is prepared from a particulate admixture of 20 to 50 vol. % niobium and zirconium oxide which may be stabilized with an addition of a further oxide such as magnesium oxide, calcium oxide, or yttria. The composition is prepared by blending the powders, pressing or casting the blend into the desired product configuration, and then sintering the casting or compact in an inert atmosphere. In the casting operation, calcium aluminate is preferably added to the admixture in place of a like quantity of zirconia for providing a cement to help maintain the integrity of the sintered product.Type: GrantFiled: June 9, 1981Date of Patent: September 27, 1983Inventors: David E. Beck, Jack G. Gooch, Cressie E. Holcombe, Jr., David R. Masters
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Patent number: 4389250Abstract: Fine grained copper-based or nickel-based memory alloys having a matrix of .beta.-high temperature phase with metal oxide particles dispersed in the matrix which act to retard grain growth have improved mechanical characteristics such as elongation, toughness and workability, compared to cast and worked alloys. These alloys are produced by powder metallurgy.Type: GrantFiled: March 2, 1981Date of Patent: June 21, 1983Assignee: BBC Brown, Boveri & Company LimitedInventors: Keith Melton, Olivier Mercier, Helmut Riegger
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Patent number: 4341556Abstract: There is described a material for electrical contacts based on silver having 5 to 20 weight % tin oxide and 0.5 to 5 weight % tungsten oxide which has the welding strength reduced further without producing an increased switching temperature. The material contains additionally 0.1 to 5 weight % of bismuth oxide.Type: GrantFiled: April 30, 1981Date of Patent: July 27, 1982Assignee: Degussa - AktiengesellschaftInventors: Wolfgang Bohm, Roger Wolmer, Andreas Szulczyk, Willi Malikowski
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Patent number: 4334926Abstract: A bearing material which is excellent in seizure resistance, wear resistance and conformability. The bearing material is prepared by sintering, on a backing steel sheet, a powder mixture consisting of Cu-Pb base alloy powder or its constituent metal powders and 1 to 30 wt. % of one or more members of hard material powders. The hard material powders mean the powders of Mo, Co, Fe.sub.3 P, Fe.sub.2 P, self-fusing alloys, FeB, Fe.sub.2 B, Fe-Cr, Fe-Mn, Fe-Si, Cr, W; SiC and other carbides, TiN and other nitrides, and SiO.sub.2 and other oxides. The bearing material of the present invention is characterized in that it has excellent sliding characteristics especially relative to the materials having rough surfaces.Type: GrantFiled: March 12, 1980Date of Patent: June 15, 1982Assignee: Taiho Kogyo Co., Ltd.Inventors: Kenichiro Futamura, Tatsuhiko Fukuoka
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Patent number: 4315777Abstract: This invention relates to dispersion strengthening of metals. A coherent mass comprising an intimate blend of alloy powder and oxidant is formed prior to dispersion strengthening. Said coherent mass is easily formed because the alloy powder is not yet strengthened, and undergoes internal oxidation rapidly because of the intimate blend of alloy powder and oxidant.Type: GrantFiled: August 7, 1979Date of Patent: February 16, 1982Assignee: SCM CorporationInventors: Anil V. Nadkarni, Warren J. Haws, Charles I. Whitman
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Patent number: 4311524Abstract: According to the invention, a sintered iron-based friction material comprises copper, tin, graphite, pyroceramic, lead, and zinc sulphide, the ratio of the components expressed in percent by mass being as follows:copper: 1.5 to 3.0tin: 1.0 to 2.0zinc sulphide: 2.0 to 4.0graphite: 6.0 to 10.0pyroceramic: 2.0 to 5.0lead: 10.0 to 20.0the balance being iron.Type: GrantFiled: April 1, 1980Date of Patent: January 19, 1982Inventors: Valery A. Genkin, Alexandr A. Dmitrovich, Efim I. Fishbein
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Patent number: 4293337Abstract: A material and a process for use in making electrical contacts. The material is produced in powder form suitable for later processing into electrical contacts by standard metallurgical techniques generally involving compacting the powdered material to form a compact that preferably has a backing of metallic silver, sintering the compact to form the contact having a fine sintered silver backing and forming or cutting the contact to make it to the desired shape and size. The material, and in most general applications the contact made from the material, essentially consists of silver, approximately 15% cadmium oxide by weight, and lithium carbonate at a proportion of about 0.005 weight percent of lithium, which is approximately equal to 0.04 molecular percent of lithium carbonate.Type: GrantFiled: August 20, 1979Date of Patent: October 6, 1981Assignee: Square D CompanyInventor: Frank S. Brugner, Jr.
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Patent number: 4292079Abstract: An improved dispersion strengthened aluminum-base alloy and an improved method for producing the alloy are provided. A preferred alloy comprises, by weight, about 3 to 5% Mg, about 0.2-2.5% C, and about 0.3 to 4% O and the balance essentially aluminum.Type: GrantFiled: October 4, 1979Date of Patent: September 29, 1981Assignee: The International Nickel Co., Inc.Inventors: Joseph R. Pickens, Robert D. Schelleng, Stephen J. Donachie, Thomas J. Nichol
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Patent number: 4289833Abstract: A liquid phase sintered body for brazed joints having a multiplicity of pores, grooves and/or indented patterns formed on a desired surface. The liquid phase sintered body is produced by a method comprising the steps of forming a compact body of a mixture of a hard refractory material, such as carbides, nitrides, oxides, borides and silicides mixed with cementing metal in powder form, placing on the desired surface any one of coarse grains, strands or plates of a metal having a diameter or a thickness over ten times as great as the grain size of the cementing metal, and sintering the compact body under conditions suitable for melting the coarse grains, strands and/or mesh of strands or plates after densification of the compact body has been completed or substantially completed. The metal forming the coarse grains, strands or plates must have a melting point which is more than 50.degree. C.Type: GrantFiled: March 19, 1979Date of Patent: September 15, 1981Assignee: Kabushiki Kaisha Fujikoshi t/a Nachi-Fujikoshi Corp.Inventor: Takeji Hachisuka
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Patent number: 4282034Abstract: Bulk shapes and solid structures of amorphous metals formed of micron sized particles produced by droplet emulsion technique whereby undercooled droplets are solidified in the amorphous state with a stabilizing coating on the surfaces thereof, the shapes and solid structures being formed by dispersing the stabilizing coating and bringing the particles into intimate metal to metal contact for atomic bonding, without raising the temperature to crystallization temperature.Type: GrantFiled: November 13, 1978Date of Patent: August 4, 1981Assignee: Wisconsin Alumni Research FoundationInventors: Jeffery S. Smith, John H. Perepezko, Don H. Rasmussen, Carl R. Loper, Jr.
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Patent number: 4274875Abstract: The invention consists of a process for the production of articles by powder metallurgy including the step of adding powdered mica to the metal powder before compacting and sintering. It also extends to a sintered metal product containing mica, in particular a valve seat insert and a shock absorber piston ring. The quantity of mica is preferably between 0.5% and 2% by weight of the metal.Type: GrantFiled: July 19, 1978Date of Patent: June 23, 1981Assignee: Brico Engineering LimitedInventors: Terence M. Cadle, Martyn S. Lane
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Patent number: 4256489Abstract: A solid, self lubricating bearing material especially useful as a sliding electrical contact in vacuum environments comprising a high temperature lubricant chosen from AlPO.sub.4, BaF.sub.2, CaF.sub.2 and mixtures thereof, a lower temperature solid lubricant chosen from the chalcogenides which exhibit lubricity, & a silver matrix, the ratio of high temperature lubricant to silver being about 1:4 to 1:10, the ratio of lower temperature lubricant to silver being about 1:2 to 1:8. Filler materials up to 20% by weight chosen from aluminum oxide, silicon nitride, molybdenum silicide, metals from Group 8 of the Periodic Table, and mixtures thereof may be added to alter the hardness of the material.Type: GrantFiled: January 10, 1979Date of Patent: March 17, 1981Assignee: The Boeing CompanyInventor: Jan W. Van Wyk
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Patent number: 4255193Abstract: A mixture of iron powder reinforced with iron oxides, are compressed and sintered to form improved sintered iron pressed pieces.Type: GrantFiled: September 18, 1979Date of Patent: March 10, 1981Assignee: Slovenska akademia viedInventors: Milan Slesar, Vladimir Miskovic, Eva Dudrova
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Patent number: 4234338Abstract: Thermal shock resistant cermet insulators containing 0.1-20 volume % metal present as a dispersed phase. The insulators are prepared by a process comprising the steps of (a) providing a first solid phase mixture of a ceramic powder and a metal precursor; (b) heating the first solid phase mixture above the minimum decomposition temperature of the metal precursor for no longer than 30 minutes and to a temperature sufficiently above the decomposition temperature to cause the selective decomposition of the metal precursor to the metal to provide a second solid phase mixture comprising particles of ceramic having discrete metal particles adhering to their surfaces, said metal particles having a mean diameter no more than 1/2 the mean diameter of the ceramic particles, and (c) densifying the second solid phase mixture to provide a cermet insulator having 0.1-20 volume % metal present as a dispersed phase.Type: GrantFiled: December 28, 1978Date of Patent: November 18, 1980Assignee: The United States of America as represented by the United States Department of EnergyInventors: Chester S. Morgan, William R. Johnson
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Patent number: 4217151Abstract: A cermet type magnetic material whose essential components are Fe, Co and/or Ni and an oxide ceramic such as SiO, Al.sub.2 O.sub.3, SiO.sub.2, MgO or TiO.sub.2. This material features large hardness, high saturation magnetic induction, low coercive force and good durability and can readily be produced in the form of thin film on a substrate. Optionally this magnetic material may additionally comprise at least one of Si, B, P and C, or Cr and/or Mn.Type: GrantFiled: January 26, 1979Date of Patent: August 12, 1980Assignee: Victor Company of Japan, LimitedInventors: Hideaki Mizuno, Susumu Terawaki
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Patent number: 4208209Abstract: A method for preparing formed metallic structures involves admixing finely ground metals with a reactive phosphor or iron containing binder and subjecting the resultant mixture to compression.Type: GrantFiled: March 8, 1978Date of Patent: June 17, 1980Inventor: Kamil Sor
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Patent number: 4183746Abstract: This invention relates to intimate mixtures of ceramic materials and metals, usually referred to as cermets. A cermet of the invention comprises a first phase of ceramic particles and a second phase of a metallic material wherein at least a major proportion of the particles have their surfaces treated with an additive which forms a material capable of bonding together the materials of the first and second phase. The metallic phase may be gold, silver or a platinum group metal. The ceramic phase may be a refractory oxide of alumina and the additive is derived from at least one of the metals yttrium, aluminium, titanium, vanadium, chromium and nickel.The cermet materials of this invention are particularly useful in the manufacture of erosion resistant components used in glass making operations and in the electrical industry.Type: GrantFiled: December 20, 1976Date of Patent: January 15, 1980Assignee: Johnson, Matthey & Co., LimitedInventors: Stephen L. Pearce, Gordon L. Selman
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Patent number: 4155757Abstract: Conducting cermets with volume fractions of nickel down to 0.045 are produced by coating relatively coarse refractory oxide granules with fine metal powder particles are compacting and sintering the coated granules. Using oxide granules in the size range 400 to 800 microns it is possible to make conducting cermets having the same volume fraction of metal and thus the same thermal expansion coefficients as insulating cermets prepared from finer granules of the same oxide. The cermets can be used to fabricate tubes and components for electric lamps and may include integrally formed conducting and insulating regions.Type: GrantFiled: December 8, 1976Date of Patent: May 22, 1979Assignee: Thorn Electrical Industries LimitedInventor: Peter Hing
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Patent number: 4155758Abstract: Conducting cermets with volume fractions of nickel down to 0.045 are produced by coating relatively coarse refractory oxide granules with fine metal powder particles and compacting and sintering the coated granules. Using oxide granules in the size range 400 to 800 microns it is possible to make conducting cermets having the same volume fraction of metal and thus the same thermal expansion coefficients as insulating cermets prepared from finer granules of the same oxide. The cermets can be used to fabricate tubes and components for electric lamps and may include integrally formed conducting and insulating regions.Type: GrantFiled: December 8, 1976Date of Patent: May 22, 1979Assignee: Thorn Electrical Industries LimitedInventors: David T. Evans, Peter Hing, Raymond Marshall
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Patent number: 4141727Abstract: An electrical contact material comprising silver, bismuth oxide and tin oxide with or without tin metal, wherein the amounts of the bismuth and the tin on the basis of the sum weight of the metals in both the metal component and in the metal oxide component are 1.5 to 6 weight percent and 0.1 to 6 weight percent, respectively. This electrical contact material has high resistance to both welding and arc erosion. An advantageous method of making the electrical contact material comprises preparing a metal alloy composed of all the above metals in the above weight ratio and internally oxidizing the bismuth completely in the alloy after shaping the alloy to a desired electrical contact material shape or after crushing the alloy to scaly flakes.Type: GrantFiled: November 29, 1977Date of Patent: February 27, 1979Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Sankichi Shida, Shinji Okuma, Mashiro Oita, Hyogo Hirohata
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Patent number: 4127700Abstract: A metallic material, particularly useful for electrical contacts, comprises a matrix metal, for example silver or copper, with additives embedded therein in powder form. However, while being in powder form the additives are arranged in elongate fiber like lengths preferably parallel fiber like lengths. A method of producing such a distribution is to fill a tube of the matrix metal with the powder and draw it out to wire thickness, bundle a number of such wires together and fuse the outer coverings to form a continuous matrix with embedded fiber like lengths of powder.Type: GrantFiled: October 4, 1974Date of Patent: November 28, 1978Assignee: G. RauInventors: Dieter Stockel, Friedrich Schneider, Hermann Heiss
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Patent number: 4071473Abstract: Highly active catalysts, suitable for use in hydrogenation and other reactions, are prepared from an alloy of one or more of the Group VIII transition metals with yttrium or a rare earth metal. The alloy is ground to the desired particle size and is thereafter reacted with a gas containing carbon monoxide and hydrogen to form an intimate physical admixture of the Group VIII metal or its corresponding carbide with the oxide of yttrium or the rare earth metal.Type: GrantFiled: November 3, 1976Date of Patent: January 31, 1978Assignee: The United States of America as represented by the Secretary of the InteriorInventors: Gary B. Atkinson, Larry J. Nicks
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Patent number: 4069043Abstract: Shaped magnetic articles made from powder material are provided containing about 70 to 85% nickel, more than 10% iron, one or more of 0 to 5% chromium, 0 to 6% molybdenum, 0 to 6% copper, 0 to 2% manganese, 0 to 1% titanium and 0 to 1% niobium, containing also about 0.1 to 2.0% of a refractory metal oxide, and having a unique combination of magnetic and physical properties. A process for making the shaped magnetic articles from metal powder and refractory oxide is also disclosed by which the metal and refractory oxide powder are blended, sintered and worked to provide substantially homogeneous articles having at least 99% theoretical density.Type: GrantFiled: January 19, 1976Date of Patent: January 17, 1978Assignee: Carpenter Technology CorporationInventor: Friedrich W. Ackermann
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Patent number: RE31846Abstract: A material and a process for use in making electrical contacts. The material is produced in powder form suitable for later processing into electrical contacts by standard metallurgical techniques generally involving compacting the powdered material to form a compact that preferably has a backing of metallic silver, sintering the compact to form the contact having a fine sintered silver backing and forming or cutting the contact to make it to the desired shape and size. The material, and in most general applications the contact made from the material, essentially consists of silver, approximately 15% cadmium oxide by weight, and lithium carbonate at a proportion of about 0.005 weight percent of lithium, which is approximately equal to 0.04 molecular percent of lithium carbonate.Type: GrantFiled: April 22, 1983Date of Patent: March 12, 1985Assignee: Square D CompanyInventor: Frank S. Brugner, Jr.