Base Metal One Or More Transition Metal Patents (Class 75/245)
-
Patent number: 4954170Abstract: High density compacts are made by providing a compactable particulate combination of Class 1 metals selected from at least one of Ag, Cu and Al, with material selected from at least one of CdO, SnO, SnO.sub.2, C, Co, Ni, Fe, Cr, Cr.sub.3 C.sub.2, Cr.sub.7 C.sub.3, W, WC, W.sub.2 C, WB, Mo, Mo.sub.2 C, MoB, Mo.sub.2 B, TiC, TiN, TiB.sub.2, Si, SiC, Si.sub.3 N.sub.4, usually by mixing powders of each, step (1); uniaxially pressing the powders to a density of from 60% to 95%, to provide a compact, step (2); hot densifying the compact at a pressure between 352 kg/cm.sup.2 (5,000 psi) and 3,172 kg/cm.sup.2 (45,000 psi) and at a temperature from 50.degree. C. to 100.degree. C. below the melting point or decomposition point of the lower melting component of the compact, to provide densification of the compact to over 97% of theoretical density; step (3); and cooling the compact, step (4).Type: GrantFiled: June 30, 1989Date of Patent: September 4, 1990Assignee: Westinghouse Electric Corp.Inventors: Maurice G. Fey, Natraj C. Iyer, Alan T. Male, William R. Lovic
-
Patent number: 4950450Abstract: A method of making high energy Nd-Fe-B magnets having a mass less than 30 grams wherein an alloy of said materials having a grain size less than that desired in the finished magnet is first prepared and subsequently hot worked to the desired configuration with increased magnetic properties and density by introducing into a cavity formed by a die and punch a Nd-Fe-B alloy powder having a particle size of from 45 .mu.m to 250 .mu.m and a grain size of from 100 to 1500 angstroms, compressing the powder at a temperature of from about 550.degree. C. to 750.degree. C. under a die-punch pressure of at least 10 kpsi under a vacuum of less than 200 millitorr to achieve a permanent magnet having a remanence of at least 7 kilogauss.Type: GrantFiled: July 21, 1988Date of Patent: August 21, 1990Assignee: Eastman Kodak CompanyInventors: Dilip K. Chatterjee, Thomas W. Martin, Paul D. Askins
-
Patent number: 4950327Abstract: A creep-resistant alloy having a tiered structural arrangement of one or several refractory metals Mo, W, Nb, Ta, V, Cr containing certain doping agents, as well as a process for producing the same. The special doping agents are compounds and/or mixed phases of such compounds selected from the group of oxides, nitrides, carbides, borides, silicates or aluminates having a melting point higher than 1500.degree. C. The size of their grains is .ltoreq.1.5 .mu.m, their proportion in the alloy is comprised between 0.005 and 10% by weight. Unlike in the known state of the art, the use of porassium as doping agent is avoided in this alloy. A good reproducible consolidation and in particular high densities during sintering can thus be obtained. Furthermore, this alloy has better ambient temperature, heat and creep resistance properties than known alloys of refractory metal with a tiered structual arrangement.Type: GrantFiled: September 27, 1988Date of Patent: August 21, 1990Assignee: Schwarzkopf Development CorporationInventors: Ralf Eck, Gerhard Leichtfried
-
Patent number: 4946501Abstract: An alloy target for magneto-optical recording having component and composition comprising 10 to 50 atom % of at least one rare earth element from Sm, Nd, Gd, Tb, Dy, Ho, Tm and Er, the balance being substantially at least one transition metal from Co, Fe and Ni, and having a mixed structure comprising a phase of intermetallic compound of the rare earth element and the transition metal and a fine mixed phase of the rare earth element and intermetallic compound of the rare earth element and the transition metal or having a mixed structure comprising the structure above and a phase of the rare earth element alone. The target has uniform composition and high strength free from cracking, etc., shows less composition difference between film and target and less change of the film composition with elapse of sputtering time.Type: GrantFiled: October 16, 1989Date of Patent: August 7, 1990Assignee: Sumitomo Metal Mining Company LimitedInventors: Tasuo Nate, Toshio Morimoto, Kouichi Oka, Shinobu Endo
-
Patent number: 4940490Abstract: An improved flaked tantalum powder and process for making the flaked powder are disclosed. The powder is characterized by having a Scott density greater than about 18 g/in.sup.3 and preferably at least about 90% of the flake particles having no dimension greater than about 55 micrometers. Agglomerates of the flaked tantalum powder, provide improved flowability, green strength and presssing characteristics compared to conventional flaked tantalum powders. The improved flaked tantalum powder can be made by preparing a flaked tantalum and then reducing the flake size until a Scott density greater than about 18 g/in.sup.3 is achieved. The invention also provides pellets and capacitors prepared from the above-described flaked tantalum powder.Type: GrantFiled: June 21, 1988Date of Patent: July 10, 1990Assignee: Cabot CorporationInventors: James A. Fife, Marlyn F. Getz
-
Patent number: 4938798Abstract: A high melting metal silicide sputtering target which comprises a fine texture whose stoichiometric composition grains of MSi.sub.2, where M represents a high melting metal, have a maximum grain size of 20 .mu.m, whose free silicon grains have a maximum grain size of 50 .mu.m and whose oxygen content is not more than 200 ppm and has a density ratio to the theoretical density of 99% or more has good film characteristics including the reduction in the number of grains formed on the sputtered film and is useful as an electrode material or a wiring material in semi-conductor devices.Type: GrantFiled: March 7, 1988Date of Patent: July 3, 1990Assignee: Hitachi Metals, Ltd.Inventors: Yoshitaka Chiba, Noriyoshi Hirao, Toru Sugihara, Kenji Hasegawa
-
Patent number: 4931253Abstract: A method for producing a titanium alloy powder metallurgy article having high resistance to loading and creep at high temperature is described and comprises the steps of simultaneously pressing a preselected quantity of titanium alloy powder at from 15 to 60 ksi and heating the powder to a temperature just below the beta transus temperature of the alloy to promote beta to alpha phase transformation in the alloy, and then slowly cooling the compacted powder under pressure.Type: GrantFiled: August 7, 1989Date of Patent: June 5, 1990Assignee: United States of America as represented by the Secretary of the Air ForceInventors: Daniel Eylon, Francis H. Froes, Gerhard Welsch
-
Patent number: 4929275Abstract: This invention relates to novel permanent magnet alloy compositions and high energy permanent magnets comprising from about 0.5 to about 27 atomic percent R wherein R is at least one rare earth element including Y and Sc, from about 0.1 to about 53 atomic percent A wherein A is at least one actinide element, and the balance being at least one metal wherein at least about 50 weight percent of the balance is at least one metal selected from the group consisting of Fe, Co, Ni, and Mn. Preferably, R is from about 12 to about 18 atomic percent and R is a rare earth element selected from the group consisting of Sm, Nd, Pr, and Dy. It is also preferred that A is from about 1.5 to about 5.1 atomic percent and A is an actinide element selected from the group consisting of Ac, Th, Pa and U. The balance is preferably at least about 90 weight percent of Fe and/or Co, and further comprises from about 0.1 to about 10 weight percent of Zr and/or Cu.Type: GrantFiled: May 30, 1989Date of Patent: May 29, 1990Assignee: SPS Technologies, Inc.Inventor: Yakov Bogatin
-
Patent number: 4927458Abstract: Methods for enhancing the toughness of otherwise brittle powder metallurgy materials are presented. Adding moderate amounts of tough particulate to such brittle material enhances their ductility in excess of that which would be predicted mathematically.Type: GrantFiled: September 1, 1988Date of Patent: May 22, 1990Assignee: United Technologies CorporationInventors: Martin J. Blackburn, Michael P. Smith
-
Patent number: 4923513Abstract: A carefully controlled amount of hydrogen is diffused into titanium or its alloys at an elevated temperature above the transformation temperature. After the elevated temperature is maintained for an approprate duration of time, eutectoid transformation is performed in an inert atmosphere, again for an appropriate period of time, during which or alternatively after which the hydrogen is removed and the metal cooled to room temperature. A sintered titanium alloy component of the type intended for use as a joint replacement subjected to such a treatment displays a fatigue strength which is noticeably improved over a similar article with an equiaxed or lamellar microstructure.Type: GrantFiled: April 21, 1989Date of Patent: May 8, 1990Assignee: Boehringer Mannheim CorporationInventors: Paul Ducheyne, David H. Kohn
-
Patent number: 4917858Abstract: A method for producing foil of titanium aluminide is described which comprises providing a preselected quantity of blended powder of chloride free commercially pure elemental titanium, aluminum and other alloying metal(s) in preselected proportions, rolling the blended powder into a green foil, sintering the green foil, and thereafter pressing the sintered foil to full density.Type: GrantFiled: August 1, 1989Date of Patent: April 17, 1990Assignee: The United States of America as represented by the Secretary of the Air ForceInventors: Daniel Eylon, Francis H. Froes
-
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
-
Patent number: 4906295Abstract: The present invention relates to a method of sintering ceramics and ceramics obtained by said method. According to the present invention, the synthesis and sintering of ceramics can be simultaneously carried out by utilizing the reaction heat generated when at least one metallic element selected from metallic elements of IIIb, IVa, Vb and VIb groups of the Periodic Table is combined with at least one nonmetallic element such as B, C, N and Si without heat or by preliminarily heating the ceramics at temperatures remarkably lower than the usual sintering temperature ceramics, thus-produced are superior in abrasion resistance and corrosion resistance.Type: GrantFiled: February 16, 1988Date of Patent: March 6, 1990Assignees: Sumitomo Electric Industries, Ltd., Yoshinari Miyamoto, Osamu Yamada, Mitsue KoizumiInventors: Yoshinari Miyamoto, Osamu Yamada, Mitsue Koizumi, Osamu Komura, Eiji Kamijo, Masaaki Honda, Akira Yamakawa
-
Patent number: 4897127Abstract: A TiAl composition is prepared to have high strength and to have improved ductility by altering the atomic ratio of the titanium and niobium to have what has been found to be a highly desirable effective aluminum concentration by addition of a combination of manganese and niobium according to the approximate formula Ti.sub.52-42 Al.sub.46-50 Nb.sub.1-5 Mn.sub.1-3.Type: GrantFiled: October 3, 1988Date of Patent: January 30, 1990Assignee: General Electric CompanyInventor: Shyh-Chin Huang
-
Patent number: 4894273Abstract: Bonding additives for refractory metallization compositions allow for circuit traces having good resistivities and adhesion values in excess of 6 kpsi, generally between about 10 and 20 kpsi. The inks are provided in formulations devoid of a glass component, and are suitable for co-sintering circuit traces and vias with 96% alumina substrates, and especially for 99% alumina substrates. Suitable bonding additives are the oxides of molybdenum, tungsten, niobium, manganese, yttrium, and titanium, or mixtures of such oxides.Type: GrantFiled: June 16, 1988Date of Patent: January 16, 1990Assignee: Ceramics Process Systems Corp.Inventors: Sheldon I. Lieberman, Eric A. Barringer, Brian C. Foster
-
Patent number: 4894088Abstract: A pellet for fabricating a metal matrix composite is made of a mixture of a matrix member of a metal powder and at least one reinforcement selected from whiskers, short fibers and suitable particles, the reinforcement being uniformly distributed in a matrix of the metal powder and said mixture being kept in a shape with a binder, wherein said pellet has a surface layer of dried and rigid portion of said mixture which is rigid enough to keep its shape under an external pressure applied thereto. The pellet is formed from a flat cake of the mixture separated from a slurry consisting of a solution medium and the mixture dispersed therein uniformly. Alternatively, the pellet is formed from the mixture in a dried condition with a granulation binder diluted with a solution medium.Type: GrantFiled: December 15, 1987Date of Patent: January 16, 1990Assignee: Kabushiki Kaisha Kobe Seiko ShoInventors: Yoshihiro Yamaguchi, Hiroyuki Murata, Shunichi Mizukami, Kenichiro Ohuchi, Hiroyuki Morimoto, Jun Hirose
-
Patent number: 4889686Abstract: A composite is produced by depositing a slurry of infiltration-promoting material and organic binding material on a layer of boron nitride coated fibrous material forming a tape therewith on drying, firing the tape to burn out organic binding material and infiltrating the resulting porous body with a solution of boron and silicon.Type: GrantFiled: February 17, 1989Date of Patent: December 26, 1989Assignee: General Electric CompanyInventors: Raj N. Singh, Achuta R. Gaddipati
-
Patent number: 4879092Abstract: A TiAl composition is prepared to have high strength and to have improved ductility by altering the atomic ratio of the titanium and aluminum to have what has been found to be a highly desirable effective aluminum concentration by addition of chromium and niobium according to the approximate formula --Ti.sub.50-46 Al.sub.46-50 Cr.sub.2 Nb.sub.2.Type: GrantFiled: June 3, 1988Date of Patent: November 7, 1989Assignee: General Electric CompanyInventor: Shyh-Chin Huang
-
Patent number: 4859255Abstract: A magnetically anisotropic sintered permanent magnet of the FeCoBR system (R is sum of R.sub.1 and R.sub.2) wherein:R.sub.1 is Dy, Tb, Gd, Ho, Er, Tm and/or Yb, andR.sub.2 comprises 80 at % or more of Nd and Pr in R.sub.2, and the balance of other rare earth elements exclusive of R.sub.1,said system consisting essentially of, by atomic percent, 0.05 to 5% of R.sub.1, 12.5 to 20% of R, 4 to 20% of B up to 35% of Co, and the balance being Fe. Additional elements M(Ti, Zr, Hf, Cr, Mn, Ni, Ta, Ge, Sn, Sb, Bi, Mo, Nb, Al, V, W) may be present.Type: GrantFiled: February 29, 1988Date of Patent: August 22, 1989Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Setsuo Fujimura, Masato Sagawa, Yutaka Matsuura, Hitoshi Yamamoto, Norio Togawa
-
Patent number: 4849017Abstract: A magnetic refrigerant for magnetic refrigeration which comprises a sintered body containing at least one of rare earth elements selected from the group consisting of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and yttrium and a balance consisting essentially of at least one of aluminum, nickel and cobalt.This invention provides sintered magnetic bodies which are suited for use as magnetic refrigerants, and also provides significant contribution to the performance improvement of magnetic refrigerators and to the materialization of regenerator-type magnetic refrigerants.Type: GrantFiled: January 30, 1986Date of Patent: July 18, 1989Assignee: Kabushiki Kaisha ToshibaInventors: Masashi Sahashi, Koichiro Inomata
-
Patent number: 4846885Abstract: Disclosed is a nickel-base alloy eminently suited for use as a welding filler material. The alloy contains over 40% molybdenum with an effective content of silicon to provide a valuable combination of engineering properties which includes the combination of high strength, excellent corrosion resistance and welding characteristics. Commercial production of the alloy may be in many forms, for example, castings, powder metallurgy articles, wrought products and the like. A typical alloy of this invention contains about 42% molybdenum, 0.25% silicon and the balance nickel plus modifying elements and impurities.Type: GrantFiled: November 27, 1987Date of Patent: July 11, 1989Assignee: Haynes International, Inc.Inventors: Aziz Asphahani, Steven J. Matthews
-
Patent number: 4840684Abstract: Isotropic permanent magnet formed of a sintered body having a mean crystal grain size of 1-160 microns and a major phase of tetragonal system comprising, in atomic percent, 10-25% of R wherein R represents at least one of rare-earth elements including Y, 3-23% of B and the balance being Fe. As additional elements M, Al, Ti, V, Cr, Mn, Zv, Hf, Nb, Ta, Mo, Ge, Sb, Sn, Bi, Ni or W may be incorporated.The magnets can be produced through a powder metallurgical process resulting in high magnetic properties, e.g., up to 7 MGOe or higher energy product.Type: GrantFiled: December 30, 1983Date of Patent: June 20, 1989Assignee: Sumitomo Special Metals Co, Ltd.Inventors: Setsuo Fujimura, Masato Sagawa, Yutaka Matsuura
-
Patent number: 4836849Abstract: Disclosed is a mixture of about 55% to about 90% by volume powdered niobium alloy and about 10% to about 45% by volume powdered intermetallic compound selected from the group consisting of NbAl.sub.3, NbFe.sub.2, NbCo.sub.2, NbCr.sub.2, and mixtures thereof. The mixture is mechanically alloyed to intermix the intermetallic compound with the particles of the niobium alloy. A shape is made by consolidating the mechanically alloyed powder.Type: GrantFiled: April 30, 1987Date of Patent: June 6, 1989Assignee: Westinghouse Electric Corp.Inventors: Robert C. Svedberg, Robert L. Ammon
-
Process for the production of chromium-aluminum balls for adding chromium into molten aluminum baths
Patent number: 4820483Abstract: The present invention relates to a process for the production of chromium-aluminum balls for adding chromium into molten aluminum baths.In order to obtain balls containing x% of chromium and y% of aluminum, where x and y are gravimetric contents corresponding to the following relationships:70.ltoreq.x.ltoreq.8020.ltoreq.y.ltoreq.30x+y=100an alloy of chromium and aluminum containing gravimetric chromium and aluminum contents approximating to x by an excess and to y by a deficit respectively is prepared by melting and this alloy is then finely ground into a crude powder; the chromium and aluminum contents of the alloy or of the crude powder are determined and, if required, an additional amount of finely divided aluminum is added so as to obtain a powder containing x% of chromium and y% of aluminum, the additional amount of finely divided aluminum corresponding to less than 10% by weight of the crude powder; a compacting is then carried out.Type: GrantFiled: December 22, 1987Date of Patent: April 11, 1989Assignee: Delachaux SAInventor: Alain Defrance -
Patent number: 4793859Abstract: A process for producing a brazable ceramic composite by infiltrating silicon into a porous body at least partly composed of molybdenum to form at least about 5% by volume of a silicide of molybdenum in situ.Type: GrantFiled: July 13, 1987Date of Patent: December 27, 1988Assignee: General Electric CompanyInventor: Charles R. Morelock
-
Patent number: 4792368Abstract: Magnetic materials comprising Fe, B, R (rare earth elements) and Co having a major phase of Fe-Co-B-R intermetallic compound(s) of tetragonal system, and sintered anisotropic permanent magnets consisting essentially of, by atomic percent, 8-30% R (at least one of rare earth elements inclusive of Y), 2-28% B, no less than 50% Co, and the balance being Fe with impurities. Those may contain additional elements M (Ti, Ni, Bi, V, Nb, Ta, Cr, Mo, W, Mn, Al, Sb, Ge, Sn, Zr, Hf) providing Fe-Co-B-R-M type materials and magnets.Type: GrantFiled: July 25, 1983Date of Patent: December 20, 1988Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Masato Sagawa, Setsuo Fujimura, Yutaka Matsuura
-
Patent number: 4773950Abstract: A magnetically anisotropic sintered permanent magnet of the FeBR system in which R is sum of R.sub.1 and R.sub.2 wherein:R.sub.1 is Dy, Tb, Gd, Ho, Er, Tm and/or Yb, andR.sub.2 comprises 80 at % or more of Nd and Pr in R.sub.2 and the balance of at least one of other rare earth elements exclusive of R.sub.1,said system comprising by atomic percent, 0.05 to 5% of R.sub.1, 12.5 to 20% of R, 4 to 20% of B, and the balance being Fe with impurities. Additional elements M(Ti, Zr, Hf, Cr, Mn, Ni, Ta, Ge, Sn, Sb, Bi, Mo, Nb, Al, V, W,) may be present.Type: GrantFiled: September 15, 1983Date of Patent: September 27, 1988Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Setsuo Fujimura, Masato Sagawa, Yutaka Matsuura, Hitoshi Yamamoto, Norio Togawa
-
Patent number: 4770723Abstract: Magnetic materials comprising Fe, B and R (rare earth elements) having a major phase of Fe--B--R intermetallic compound(s) of tetragonal system, and sintered anisotropic permanent magnets consisting essentially of, by atomic percent, 8-30% R (at least one of rare earth elements inclusive of Y), 2-28% B and the balance being Fe with impurities. Those may contain additional elements M (Ti, Ni, Bi, V, Nb, Ta, Cr, Mo, W, Mn, Al, Sb, Ge, Sn, Zr, Hf) providing Fe--B--R--M type materials and magnets.Type: GrantFiled: February 10, 1987Date of Patent: September 13, 1988Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Masato Sagawa, Setsuo Fujimura, Yutaka Matsuura
-
Patent number: 4767474Abstract: Isotropic permanet magnet formed of a sintered body having a mean crystal grain size of 1-130 microns and a major phase of tetragonal system comprising, in atomic percent, 10-25% of R wherein R represents at least one of rare-earth elements including Y, 3-23% of B, no more than 50% of Co and the balance being Fe. As additional elements M, Al, Ti, V, Cr, Mn, Zr, Hf, Nb, Ta, Mo, Ge, Sb, Sn, Bi, Ni or W may be incorporated.The magnets can be produced through a powder meallurgical process resulting in high magnetic properties, e.g., up to 7 MGOe or higher energy product.Type: GrantFiled: December 30, 1983Date of Patent: August 30, 1988Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Setsuo Fujimura, Masato Sagawa, Yutaka Matsuura
-
Patent number: 4722827Abstract: This is a high quality zirconium or hafnium sponge, a fuel element cladding liner having material of the quality of this sponge and a process utilizing this quality sponge to fabricate liner material for lined fuel element cladding. The sponge contains 250-about 350 ppm of oxygen impurity, 50-300 ppm of iron impurity, and a total of 500-1,000 ppm of impurity. This material is much purer than conventional sponge and approaches the quality of crystal bar.Type: GrantFiled: September 26, 1985Date of Patent: February 2, 1988Assignee: Westinghouse Electric Corp.Inventor: Young J. Kwon
-
Patent number: 4714587Abstract: A process for producing titanium alloy articles by Hot Isostatic Pressing of a rapidly-solidified titanium alloy powder is provided wherein such pressing is carried out at a pressure greater than 30 ksi, and a temperature of about 60 to 80 percent of the beta-transus temperature of the alloy, in degrees C. Hot Isostatic Pressing under these conditions allows retention of the fine microstructure of the rapidly-solidified powder. The compacted article may be subjected to heat treatment to alter its microstructure.Type: GrantFiled: February 11, 1987Date of Patent: December 22, 1987Assignee: The United States of America as represented by the Secretary of the Air ForceInventors: Daniel Eylon, Francis H. Froes
-
Patent number: 4701381Abstract: Composite materials and products are described composed of a mixed metal interstitial alloy in the form of a carbide, nitride, carbonitride, oxynitride, oxycarbide or carboxynitride with the .beta..sup.m (.beta.-manganese) metal-atom arrangement, and a metallic carrier. With the carrier in the form of a binder phase for particles of the alloy a hard metal can be obtained which has a hardness not much less than a conventional WC-Co hard metal. Alternatively the alloy can be employed as a coating for a metallic substrate, for example to increase resistance to corrosion and oxidation. In a preferred composition, the interstitial alloy is nickel-molybdenum-nitride and nickel is used as the binder or the substrate material.Type: GrantFiled: July 18, 1985Date of Patent: October 20, 1987Assignee: The University of Newcastle Upon TyneInventor: Kenneth H. Jack
-
Patent number: 4670216Abstract: A three step process in which a metal alloy selected from a tungsten based alloy and molybdenum based alloys is provided to prevent the decarbonization of the alloys. The process involves a three step sintering process wherein the atmosphere during the initial heating step is a mixture of carbon monoxide and hydrogen, thereafter at a intermediate temperature range the atmosphere is hydrogen and a final heating step at a elevated temperature is employed and the atmosphere is a mixture of inert gas and a source of carbon.Type: GrantFiled: September 25, 1986Date of Patent: June 2, 1987Assignee: GTE Products CorporationInventors: Thomas J. Patrician, Vito P. Sylvester, Harry D. Martin, III
-
Patent number: 4659546Abstract: A method of manufacturing a porous body using particulate material as a starting stock. The particles are inserted in a can, the can evacuated and inert gas admitted to a predetermined back-fill pressure. After hot isostatic pressing, the compact so formed is cooled and subsequently heat treated to permit the pores formed in pressing to expand and form a porous body.Type: GrantFiled: December 24, 1985Date of Patent: April 21, 1987Assignee: IMI Titanium LimitedInventor: Michael W. Kearns
-
Patent number: 4629505Abstract: A metallurgical method including cooling molten aluminum particles and consolidating resulting solidified particles into a multiparticle body, wherein the improvement comprises the provision of greater than 0.15% of a metal which diffuses in the aluminum solid state at a rate less than that of Mn.Aluminum containing greater than 0.15% of a metal which diffuses in the aluminum solid state at a rate less than that of Mn.Type: GrantFiled: April 2, 1985Date of Patent: December 16, 1986Assignee: Aluminum Company of AmericaInventor: Henry G. Paris
-
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
-
Patent number: 4622068Abstract: The present invention provides a molybdenum alloy which suitably comprises in the range of from 0.2 to 1.0% by weight of an oxide of a specified metal prepared by adding a salt of the metal in dissolved form to molybdenum and/or a molybdenum oxide or a mixture of different molybdenum components, reducing this mixture at a temperature of up to 1150.degree. C. using hydrogen, pressing the reduced metal without the addition of a binder suitably under a pressure of from 150 to 300 mPA, and sintering the product at a temperature in the range of from 1750.degree. to 2200.degree. C. It is preferable to add salts of zirconium to the molybdenum oxide.Type: GrantFiled: November 12, 1985Date of Patent: November 11, 1986Assignee: Murex LimitedInventors: Charles E. D. Rowe, George R. Hinch
-
Patent number: 4613371Abstract: A fine amorphous metallurgical powder suitable for compacting and sintering into amorphous densified articles which consist essentially of a major portion by weight a transition metal or combination thereof and less than a minor amount of an additional component for enhancing the amorphous characteristics of densified articles produced by directing a stream of molten droplets at a repellent surface to produce the smooth surfaced and melt solidified particles having an average particle size of less than about ten micrometers.Type: GrantFiled: February 21, 1984Date of Patent: September 23, 1986Assignee: GTE Products CorporationInventors: Richard F. Cheney, Richard H. Pierce
-
Patent number: 4612162Abstract: An improvement is disclosed in a method for producing a metal article of high density comprising pressing a metal powder at a sufficient pressure to form a green article and sintering said green article at a sufficient temperature for a sufficient time to form a sintered article, the improvement being pressing the sintered article at a sufficient temperature for a sufficient time at a sufficient pressure of a non-oxidizing atmosphere to produce the final high density article.Type: GrantFiled: September 11, 1985Date of Patent: September 16, 1986Assignee: GTE Products CorporationInventors: Ricky D. Morgan, Vito P. Sylvester, Robert L. Ward
-
Patent number: 4610725Abstract: A continuous extrusion machine, in which feedstock is admitted (at 50) to a peripheral groove (12) in a rotating wheel (10), is enclosed in that groove by a cooperating shoe (24), and is frictionally dragged along an arcuate passageway (48) formed by said groove and a projecting portion (30) of said shoe towards an abutment (36) carried by the shoe. The abutment tip and adjacent wheel parts disposed downstream of the abutment are cooled directly by a jet of cooling fluid issuing from a nozzle (64) carried downstream on the shoe. An annular band (FIG. 2, 74) of a good thermally-conductive metal embedded concentrically in the wheel enhances the cooling obtained. The extrusion apparatus yields a metal product (FIG.Type: GrantFiled: January 27, 1984Date of Patent: September 9, 1986Inventors: John East, Ian Maxwell
-
Patent number: 4602953Abstract: The disclosure relates to a feedstock of particulate material for use in formation of articles therefrom, the feedstock including a homogeneous combination of large particles, small particles and a binder. The large particles comprise less than about 60% by volume of the feedstock and are defined as particles having a diameter greater than their diffusion length. The fine particles and binder combined comprise more than about 40% by volume of the feedstock, the fine particles being defined as particles having a diameter less than their diffusion length.Type: GrantFiled: March 13, 1985Date of Patent: July 29, 1986Assignee: Fine Particle Technology Corp.Inventor: Raymond E. Wiech, Jr.
-
Patent number: 4601874Abstract: A process for forming a titanium base alloy comprises compacting a powder formed of particles of titanium or of a mother alloy thereof and of a dispersion of fine particles of a product curbing the growth of the grain size, in a proportion per volume which is less than that which would lead to the formation of a continuous layer of fine particles about the particles of titanium powder. Then the alloy is heat treated at a temperature higher than the point of transformation into phase .beta. and quenched. The product is typically selected among S, P, B, As, Se, Te, Y and the lanthanides.Type: GrantFiled: July 8, 1985Date of Patent: July 22, 1986Assignee: Office National d'Etudes et de Recherche Aerospatiales (ONERA)Inventors: Michel Marty, Henri Octor, Andre Walder
-
Patent number: 4597939Abstract: A spray powder for the production of wear resistant coatings on the bearing and friction faces of machine parts subjected to sliding friction, comprising 20 to 60 weight percent molybdenum, 25 to 50 weight percent molybdenum carbide and up to 30 weight percent of a low melting point alloy.Type: GrantFiled: December 20, 1983Date of Patent: July 1, 1986Assignee: Goetze AGInventors: Hans J. Neuhauser, Ulrich Buran, Manfred Fischer, Horst Beyer
-
Patent number: 4592780Abstract: A process for producing a flat product such as a coin includes the steps of forming a slurry comprising a suspension of particulate material in a film-forming cellulose derivative, depositing a quantity of this slurry onto a support surface, drying the slurry to form a self-supporting flat product, and removing the dried product from the support surface. The particulate material essentially comprises metallic particles and matter whose chemical composition and physical properties differ from those of the metallic particles such that the added matter is not or only partially taken into solution with the metallic particles on heat treatment of the product whereby the presence of the added matter can readily be detected following such heat treatment.Type: GrantFiled: April 4, 1985Date of Patent: June 3, 1986Assignee: Mixalloy LimitedInventors: Idwal Davies, John L. Fage
-
Patent number: 4592790Abstract: A process for the production of depleted uranium metal particles comprising heating depleted uranium metal to red heat, rapidly chilling the heated metal, grinding the resulting brittlized metal to form powder size particles, annealing the particles and coating the particles with silver, copper, or lead, wherein the grinding and annealing are carried out in an inert argon atmosphere. The invention also contemplates the resulting depleted uranium metal powder, compositions containing the same as well as the liners for shaped charges formed therefrom.Type: GrantFiled: February 20, 1981Date of Patent: June 3, 1986Inventor: Alfred R. Globus
-
Patent number: 4582679Abstract: To increase the creep strength of a titanium-containing alloy which also contains chromium, the alloy powder is heated in the presence of ammonia at a temperature of the order of 700.degree. C. so as to form a layer of chromium nitride(s) on the particles and is then heated further in an inert atmosphere at a temperature between 1000.degree. C. and 1150.degree. C. to dissociate the chromium nitride(s) thereby effecting nitriding of the titanium to titanium nitride which affords dispersion-strengthening of the alloy.Type: GrantFiled: March 25, 1985Date of Patent: April 15, 1986Assignee: United Kingdom Atomic Energy AuthorityInventors: Eric G. Wilson, Andrew M. Wilson
-
Patent number: 4581069Abstract: A master alloy compacted mass of particulate metal is fabricated using non-spherical particulated aluminum, such as aluminum sawdust from production operations, in combination with metal particles of a brittle and friable principal metal of the master alloy which is non-malleable and, therefore, non-compactable. The compacted mass retains its homogeneity by the interlocking action of the aluminum sawdust and thereby obviates the need for additional binder despite the non-compactability of the metal particles of the non-malleable principal metal of the master alloy.Type: GrantFiled: July 16, 1984Date of Patent: April 8, 1986Assignee: Aluminum Company of AmericaInventor: Chester L. Zuber
-
Patent number: 4581070Abstract: An acoustical transducer is provided with an acoustically absorbant backing material having an acoustical impedance precisely matching the impedance of the piezoelectric element in the transducer. The backing material is a multiphase mixture of selected materials, such as a low melting point alloy (InPb) and one or more powders having high impedance characteristics (tungsten and copper). The slope of the curve impedance versus volume fraction of the backing components is low, thus allowing the impedance of the material to be precisely controlled. The backing material is preferably electrically conductive and is fuzed to one surface of the piezoelectric element to further improve the output characteristics of the transducer.Type: GrantFiled: August 6, 1984Date of Patent: April 8, 1986Assignee: Systems Research Laboratories, Inc.Inventors: Yoseph Bar-Cohen, David A. Stubbs, Wally C. Hoppe
-
Patent number: 4574011Abstract: The alloy of the invention comprises 75 to 90% by weight of a mixture of carbides, for example WC and TiC, and 10 to 25% of a binder. This binder comprises Co, Ni and Ru, representing together 7 to 15% of the alloy, as well as Mo.sub.2 C. This alloy is useful for the production of decorative articles having a density similar to that of stainless steel.Type: GrantFiled: March 6, 1984Date of Patent: March 4, 1986Assignee: Stellram S.A.Inventors: Christian Bonjour, Francois Duvanel
-
Patent number: RE32260Abstract: Tantalum powder capable of producing anodes of improved electrical capacitance is prepared by the addition of phosphorus-containing materials in amounts from about 5 to about 400 ppm based on elemental phosphorus. In one embodiment, the flow properties of the powder are also improved.Type: GrantFiled: July 24, 1984Date of Patent: October 7, 1986Assignee: Fansteel Inc.Inventor: Stanley S. Fry