Comminuting Patents (Class 419/33)
-
Patent number: 4750932Abstract: A refractory metal silicide sputtering target is made by reacting refractory metal and silicon to about 70 to 90% completion of the reaction, comminuting the material, and then vacuum hot pressing the comminuted material to a high density compact.Type: GrantFiled: December 18, 1986Date of Patent: June 14, 1988Assignee: GTE Products CorporationInventors: Edward D. Parent, Charles S. Purinton, Charles W. Sutter
-
Patent number: 4749545Abstract: This invention relates to metal matrix composites containing at least 40% v/v of a hard material such as SiC and a matrix of aluminium, magnesium or alloys of either. The invention also covers a method of making such composites by ball milling powders of the respective components. Other mixing techniques do not enable such a high proportion of hard material to be incorporated into the composite. The composites are useful to produce components resistant to wear.Type: GrantFiled: March 26, 1987Date of Patent: June 7, 1988Assignee: British Petroleum Co. p.l.c.Inventors: Alan R. Begg, Andrew D. Tarrant
-
Patent number: 4737339Abstract: A workpiece consisting of a heat-resistant aluminum alloy is produced by a powder-metallurgical process wherein an alloy containing 8 to 14% by weight Fe, 0.5 to 2% by weight V and 0.2 to 1% by weight Mn is melted, the melt is cooled in a gas stream at a rate of at least 10.sup.5 .degree.C/s and is atomized to form particles having a diameter of 1 to 40 .mu.m, whereupon the powder is consolidated a temperature of 350.degree. to 450.degree. C. at a pressure of 2000 to 6000 bar, to form a pressed article. In this process, the intermetallic compound Al.sub.6 Fe stabilized by Mn occurs in fine distribution. This dispersoid imparts high ductility and toughness to the grain.Type: GrantFiled: August 11, 1987Date of Patent: April 12, 1988Assignee: BBC Brown Boveri AGInventor: Malcolm J. Couper
-
Patent number: 4735770Abstract: By the inventive method, an amorphous material in powder form can be produced, whereby at least two starting components in powder form are mechanically alloyed by means of a milling process so that a boron component which cannot be alloyed mechanically can nevertheless be alloyed. According to the invention, a boron component in powder form is admixed to the starting components; this powder mixture is subjected to the milling process, an amorphous alloying component being formed from the starting components with embedded or deposited fine particles of the boron components; and the mixture powder so produced is subjected to an annealing treatment below the crystallization temperature of the amorphous alloy component for diffusing the boron into the amorphous alloy component.Type: GrantFiled: January 29, 1987Date of Patent: April 5, 1988Assignee: Siemens AktiengesellschaftInventors: Ludwig Schultz, Egon Hellstern
-
Patent number: 4734131Abstract: A permanent-magnet material having a composition represented by the following formula;R(Co.sub.1-X-Y-.alpha.-.beta. Fe.sub.X Cu.sub.Y M.sub..alpha. M'.sub.62)A(wherein X, Y, .alpha., .beta., and A respectively represent the following numbers:0.01.ltoreq.X, 0.02.ltoreq.Y.ltoreq.0.25, 0.001.ltoreq..alpha..ltoreq.0.15,0.0001.ltoreq..beta..ltoreq.0.001, and 6.0.ltoreq.A.ltoreq.8.3,providing that the amount of Fe to be added should be less than 15% by weight, based on the total amount of the composition, and R, M, and M' respectively represent the following constituents:R: At least one element selected from the group of rare earth elements,M: At least one element selected from the group consisting of Ti, Zr, Hf, Nb, V, and Ta, andM': B or B+Si),is disclosed.Type: GrantFiled: July 21, 1987Date of Patent: March 29, 1988Assignee: Kabushiki Kaisha ToshibaInventors: Tomohisa Arai, Naoyuki Sori, Seiki Sato, Nobuo Uchida
-
Patent number: 4728362Abstract: To increase service life and suppress interferences in high voltage electrodes for the ignition distributing system of internal combustion engines, the electrodes consist of molded and sintered mixture of 50-90% by weight iron powder and 50-10% by weight calcium silicide. Preferably, the electrode has tipstretched contact area of nonalloyed iron.Type: GrantFiled: April 22, 1986Date of Patent: March 1, 1988Assignee: Robert Bosch GmbHInventors: Werner Grunwald, Hans-Peter Koch, Gundmar Leuze, Hans Neu
-
Patent number: 4724121Abstract: (1) A process comprising spray drying a powder-containing slurry, the slurry containing a powder constituent susceptible of oxidizing under the temperature conditions of the spray drying, while reducing the tendency for oxidation of the constituent by including as a liquid constituent of the slurry an organic liquid; (2) a process comprising spray drying a powder-containing slurry, the powder having been pretreated to reduce content of a powder constituent susceptible of oxidizing under the temperature conditions of the spray drying, the pretreating comprising heating the powder to react the constituent; and (3) a process comprising reacting ceramic powder, grinding the reacted powder, slurrying the ground powder, spray drying the slurried powder, and blending the dried powder with metal powder.Type: GrantFiled: April 25, 1985Date of Patent: February 9, 1988Assignee: Aluminum Company of AmericaInventor: John D. Weyand
-
Patent number: 4716019Abstract: A process is disclosed for producing composite agglomerates of molybdenum and molybdenum carbide (Mo.sub.2 C). The process involves forming a relatively uniform mixture of non-agglomerated molybdenum powder and carbon powder having a particle size of no greater than the particle size of the molybdenum powder. The amount of carbon powder is proportional to the amount of molybdenum carbide desired in the composite agglomerate. A slurry is formed of the mixture, an organic binder, and water with the amount of the binder being no greater than about 2% by weight of the mixture; and the powders are agglomerated from the slurry. The agglomerated powders are then classified to remove the major portion of the agglomerates having a size greater than about 170 mesh and less than about 325 mesh from the balance of the agglomerates. The balance of the agglomerates in which the particle size is -170 +325 mesh is then reacted at a temperature of no greater than about 1400.degree. C.Type: GrantFiled: June 4, 1987Date of Patent: December 29, 1987Assignee: GTE Products CorporationInventors: David L. Houck, David J. Port, Jen S. Lee
-
Patent number: 4710236Abstract: An amorphous metal body is produced from an intermediate product formed by compacting at least two usually crystalline components of the alloy in powder form. The alloying components in the intermediate product extend in at least one dimension at most 1 um. The intermediate product is converted into the amorphous metallic body by means of a diffusion reaction at a predetermined elevated temperature. In order to produce bodies of larger size on a large technical scale, a mixture powder comprising particles is produced from the alloying components in powder form by a milling process which is terminated at a predetermined time in such a manner that the particles produced by milling have at least a predominantly layer-like structure of the alloying components. This mixture powder is then compacted into the intermediate product with the desired shape and dimensions. The intermediate product is optionally deformed.Type: GrantFiled: April 7, 1986Date of Patent: December 1, 1987Assignee: Siemens AktiengesellschaftInventor: Ludwig Schultz
-
Patent number: 4707332Abstract: A process for manufacturing structural parts of complicated shape from intermetallic phases capable of sintering by means of special additives which serve at the same time as sintering assist and increase the ductility of the finished structural part. The process includes the steps of making by melting a pre-alloy of the intermetallic phase, comminuting the pre-alloy into fine powder and mixing the fine powder with one or more additives into a mass which can then be shaped and subsequently sintered at a temperature of 70 to 95% of the absolute melting point of the intermetallic phases into a structural part of increased ductility and a density greater than 95% of the theoretical density which might possibly be subjected to subsequent pressing operations.Type: GrantFiled: October 16, 1986Date of Patent: November 17, 1987Assignee: MTU Moroten-und Turbinen-Union Muenchen GmbHInventor: Werner Huether
-
High speed steel sintering powder made from reclaimed grinding sludge and objects sintered therefrom
Patent number: 4705565Abstract: A method of producing a sintering powder made from high speed steel and alumina. This sintering powder is sinterable over a broader range of temperatures than conventional high speed steel sintering powders and at lower temperatures, thereby making sintered objects which are crack resistant and also highly wear resistant. Additionally, the sintering powder flows readily when poured into a mold for production of a green object for sintering.Type: GrantFiled: June 25, 1986Date of Patent: November 10, 1987Inventors: Robert J. Beltz, Joseph D. Dankoff -
Patent number: 4693864Abstract: Mill scale, iron ore, or taconite is utilized in a powder metallurgy process to form steel articles having approximately the same density as that of conventional rolled steel. Particulate iron is mixed with manganese, carbon, additional alloying ingredients, and a binder to form a particulate admixture. The particulate admixture is then compressed, preferably under extreme pressure until the density of the compressed particulate admixture is from about 0.2408 lbs/in.sup.3 (6.67 g/cm.sup.3) to about 0.2833 lbs/in.sup.3 (7.83 g/cm.sup.3), which corresponds to a density of from about 85% to about 100% of the density of conventional rolled steel. The resultant coherent mass is subjected to sintering and below fusion heating to form an alloyed article which can be swaged, rolled, drawn, or worked at elevated temperature to decrease the grain size of the alloyed article. The resultant end-product will preferably have a density of from about 0.2408 lbs/in.sup.3 (6.67 g/cm.sup.3) to about 0.2833 lbs/in.sup.3 (7.Type: GrantFiled: December 5, 1985Date of Patent: September 15, 1987Assignee: Donald W. Lloyd Realty, Inc.Inventor: Donald W. Lloyd
-
Patent number: 4689196Abstract: An electrical contact comprises 5 to 20 weight percent tungsten carbide, 0.5 to 3 weight percent graphite, balance silver. The contact has low erosion rate, low contact resistance, and anti-welding properties.Type: GrantFiled: February 26, 1987Date of Patent: August 25, 1987Assignee: GTE Products CorporationInventor: Chi H. Leung
-
Patent number: 4668470Abstract: A method for forming intermetallic and intermetallic-type precursor alloys for subsequent mechanical alloying applications. Elemental powders are blended in proportions approximately equal to their respective intermetallic compounds. Heating of the blend results in the formation of intermetallic compounds whereas lack of heating results in intermetallic-type powder without the intermetallic structure. The resultant powder is then blended to form a final alloy. Examples involving aluminum-titanium alloys are discussed.Type: GrantFiled: December 16, 1985Date of Patent: May 26, 1987Assignee: Inco Alloys International, Inc.Inventors: Paul S. Gilman, Arun D. Jatkar, Stephen Donachie, Winfred L. Woodard, III, Walter E. Mattson
-
Patent number: 4663120Abstract: A refractory metal silicide sputtering target is made by reacting refractory metal and silicon to about 70 to 90% completion of the reaction, comminuting the material, and then vacuum hot pressing the comminuted material to a high density compact having a theoretical density greater than about 95 percent and forming the metal silicide.Type: GrantFiled: April 15, 1985Date of Patent: May 5, 1987Assignee: GTE Products CorporationInventors: Edward D. Parent, Charles S. Purinton, Charles W. Sutter
-
Patent number: 4659379Abstract: A nickel anode electrode fabricated by oxidizing a nickel alloying material to produce a material whose exterior contains nickel oxide and whose interior contains nickel metal throughout which is dispersed the oxide of the alloying material and by reducing and sintering the oxidized material to form a product having a nickel metal exterior and an interior containing nickel metal throughout which is dispersed the oxide of the alloying material.Type: GrantFiled: April 16, 1985Date of Patent: April 21, 1987Assignee: Energy Research CorporationInventors: Prabhakar Singh, Mark Benedict
-
Patent number: 4647321Abstract: Aluminum alloy compositions and related fabrication techniques are described. Articles made of the composition by the process contain a novel dispersed strengthening phase based on iron and refractory metals. Rapid solidification techniques are used to assure a fine distribution of this phase. Articles made according to the invention have mechanical properties significantly in excess of those of conventional aluminum alloys.Type: GrantFiled: October 13, 1983Date of Patent: March 3, 1987Assignee: United Technologies CorporationInventor: Colin M. Adam
-
Patent number: 4647304Abstract: Disclosed is a method for mechanically compositing metal powders to produce composite metal powder material having a substantially homogeneous dispersion of refractory particles dispersed throughout a metallic matrix and being substantially free of oxide scale. Preferably the composite powder has a mean particle size less than about 50 microns and a mean grain size of less than about 0.5 microns which method comprises milling the metal powders with one or more refractory compounds in the presence of a cryogenic material.Type: GrantFiled: May 2, 1985Date of Patent: March 3, 1987Assignee: Exxon Research and Engineering CompanyInventors: Ruzica Petkovic-Luton, Joseph Vallone
-
Patent number: 4643873Abstract: Uranium dioxide powder produced by a gas phase process in which uranium hexafluoride is reacted with dry steam and then with steam and/or hydrogen at a higher temperature is subjected to mechanical treatment, e.g. milling, to break down its structure and increase its packing density. Other powders may be included with the uranium dioxide. The treated powder is mixed with a limited quantity (e.g. 0.5% by weight) of binder, preferably a high strength adhesive, to produce a free flowing powder and formed into pellets by pressing. The pellets are then sintered. Optionally the free flowing powder is spheroidised by tumbling prior to pressing into pellets.Type: GrantFiled: February 25, 1985Date of Patent: February 17, 1987Assignee: United Kingdom Atomic Energy AuthorityInventor: Michael R. Hayes
-
Patent number: 4636252Abstract: A method of manufacturing a cermet having high toughness and high hardness, which exhibits excellent impact resistance and wear resistance when used in cutting tools. A mixed powder is prepared which consists essentially of: titanium nitride, from 25 to 50 percent by weight; titanium carbide, from 10 to 30 percent by weight; at least one selected from the group consisting of tantalum carbide, niobium carbide, and zirconium carbide, from 5 to 25 percent by weight; tungsten carbide, from 10 to 25 percent by weight; and at least one selected from the group consisting of Co and Ni, and Al if required, from 7.5 to 25 percent by weight in total. The above mixed powder is compressed into a green compact. The green compact is sintered in a nitrogen atmosphere under a pressure within a range from 0.1 to 100 torr, and at a temperature within a range from 1400.degree. to 1550.degree. C.Type: GrantFiled: May 14, 1984Date of Patent: January 13, 1987Assignee: Mitsubishi Kinzoku Kabushiki KaishaInventors: Hironori Yoshimura, Jhunichi Toyama
-
Patent number: 4627903Abstract: This invention relates to the fabrication of an improved electrode for an electrostatic atomizing device. The electrode consists of metal oxide-metal composite fragments dispersed and bonded in a metallic matrix. The composite fragments contain submicron metallic fibers uniformally arrayed in a nonconducting (insulating) matrix. The electrostatic atomizing device includes a cell having a chamber disposed therein, a discharge spray means in communication with the cell, at least two electrodes disposed in the chamber and being in liquid contact with the liquid in the chamber, the liquid in the chamber being transported to the discharge spray means and atomized into droplets, and a mechanism for generating by means of the electrodes, a charge through the liquid within the chamber, wherein the charge enamating from the improved electrode is sufficient to generate free excess charge in the liquid within the chamber, and the liquid is atomized into droplets.Type: GrantFiled: July 26, 1982Date of Patent: December 9, 1986Assignee: Exxon Research & Engineering CompanyInventors: Alan T. Chapman, David N. Hill
-
Patent number: 4624705Abstract: Aluminum-base alloys and a method of preparing aluminum-base alloys by mechanical alloying in the presence of a carbidiferous processing aid wherein a strong carbide former such as titanium is included so as to produce carbides in the final alloy more thermally stable at temperatures in excess of 100.degree. C. than Al.sub.4 C.sub.3.Type: GrantFiled: April 4, 1986Date of Patent: November 25, 1986Assignee: Inco Alloys International, Inc.Inventors: Arun D. Jatkar, Paul S. Gilman, Raymond C. Benn
-
Patent number: 4608227Abstract: A process is provided for the preparation and fabrication of sintered titanium horseshoes whereby titanium powder is processed so that its characteristics are such that it is ideally suited for horseshoes.The sintered powder titanium horseshoes have many advantages over the present state of the art some of their advantages being that they are light weight, have high strength, are flexible, have excellent wearing characteristics, are abrasion resistant and are easily formed and shaped into the desired configuration.Type: GrantFiled: September 9, 1985Date of Patent: August 26, 1986Inventor: Mildred Preiss
-
Patent number: 4594220Abstract: A method of manufacturing a scandate dispenser cathode having a matrix at least the top layer of which at the surface consists substantially of tungsten (W) and scandium oxide (Sc.sub.2 O.sub.3) and with emitter material in or below said matrix. If said method comprises the following steps:(a) compressing a porous plug of tungsten powder(b) heating said plug in a non-reactive atmosphere and in contact with scandium to above the melting temperature of scandium,(c) cooling the plug in a hydrogen (H.sub.2) atmosphere(d) pulverizing the plug to fragments(e) heating said fragments to approximately 800.degree. C. and firing them at this temperature for a few to a few tens of minutes in a hydrogen atmosphere and slowly cooling in said hydrogen atmosphere(f) grinding the fragments to scandium hydride-tungsten powder (ScH.sub.2 /W)(g) compressing a matrix or a top layer on a matrix of pure tungsten from said ScH.sub.Type: GrantFiled: December 24, 1984Date of Patent: June 10, 1986Assignee: U.S. Philips CorporationInventors: Jan Hasker, Pieter Hokkeling, Johannes van Esdonk, Josef J. van Lith
-
Patent number: 4585619Abstract: The invention relates to a powder metallurgical method for producing high speed steel products, the shape of which is close to the desired final shape of the product, i.e. according to the so called near net shape technique.Type: GrantFiled: May 6, 1985Date of Patent: April 29, 1986Assignee: Kloster Speedsteel AktiebolagInventor: Leif Westin
-
Patent number: 4582536Abstract: The present invention provides a method for consolidating rapidly solidified, transition metal alloys which includes the step of compacting a plurality of alloy bodies at a temperature ranging from about 0.90-0.99 Tm (melting temperature in .degree.C.) for a time period ranging from about 1 min to 24 hours. The alloy bodies contain at least two transition metal elements and consist essentially of the formula (Fe,Co and/or Ni).sub.bal (W, Mo, Nb and/or Ta).sub.a (Al and/or Ti).sub.b (Cr).sub.c (B and/or C).sub.d (Si and/or P).sub.e, wherein "a" ranges from about 0-40 at. %, "b" ranges from about 0-40 at. %, "c" ranges from about 0-40 at. %, "d" ranges from about 5-25 at. %, and "e" ranges from about 0-15 at. %. The alloy bodies also have a substantially homogeneous and optically featureless structure.Type: GrantFiled: December 7, 1984Date of Patent: April 15, 1986Assignee: Allied CorporationInventor: Derek Raybould
-
Patent number: 4557893Abstract: A process for producing composite materials which comprises subjecting particles of a malleable matrix material, i.e., a metal or alloy or the components of a matrix alloy and particles of a reinforcing material such as a carbide or an oxide or an intermetallic to energetic mechanical milling under circumstances to insure the pulverulent nature of the mill charge so as to enfold matrix material around each of said reinforcing particles to provide a bond between the matrix material and the surface of the reinforcing particle. The process is exemplified by the use of aluminum alloy as the matrix material and silicon carbide as the reinforcing particles. Reinforcing particles are present in an amount of about 0.2 to about 30 volume percent of total matrix and reinforcing particles. The invention is also directed to the product of the process.Type: GrantFiled: June 24, 1983Date of Patent: December 10, 1985Assignee: INCO Selective Surfaces, Inc.Inventors: Arun D. Jatkar, Alfred J. Varall, Jr., Robert D. Schelleng
-
Patent number: 4519839Abstract: A sintered high vanadium high speed steel with an excellent hardness and ductility of composition C 1.4-6.2%, W+2 Mo (W-equivalent) 10.0-24.0%, Cr 3.0-6.0%, V 8.5-28%, Co less than 17%, the remainder Fe and inevitable impurities, and a method of producing same.It can be produced by the steps of commingling the alloy constituents in the form of pulverulent oxides and carbon powder, heating the mixture in a stream of hydrogen, thereby reducing the mixture by the carbon and hydrogen simultaneously to yield an alloy powder, adjusting the composition and the grain size of the obtained alloy powder, pressing the alloy powder to a compact, sintered the compact in a vacuum, and finally converting the matrix of the sintered body into martensite by heat treatment.Type: GrantFiled: October 3, 1984Date of Patent: May 28, 1985Assignees: The Furukawa Electric Co., Ltd., Kanto Denka Kogyo Co., Ltd., Fujidie Co., Ltd.Inventors: Ishibachi Toyoaki, Yoshihara Minoru, Takuma Takashi, Fuke Yasunori, Maeda Masayuki
-
Patent number: 4481166Abstract: A wear-resistant hard metal free of tungsten carbide. The hard metal comprises: molybdenum carbide; a carbide of another transition metal; boron, boron nitride, boron carbide, or a mixture thereof, in an amount of 0.1 to 1% by weight boron, based on the weight of the molybdenum carbide, other transition metal carbide and boron-containing material, and a binder metal selected from the group consisting of metals of the iron group of the Periodic Table of Elements, and alloys thereof.Type: GrantFiled: April 1, 1981Date of Patent: November 6, 1984Assignee: Kernforschungszentrum Karlsruhe GmbHInventors: Helmut Holleck, Fritz Thuemmler, Leo Prakash
-
Patent number: 4473402Abstract: New cobalt base alloys containing chromium and carbon are disclosed. The alloys are subjected to rapid solidification processing (RSP) technique which produces cooling rates between 10.sup.5 to 10.sup.7 .degree. C./sec. The as-quenched ribbon, powder etc. consists predominantly of amorphous phase. The amorphous phase is subjected to suitable heat treatments so as to produce a transformation to a microcrystalline alloy which includes carbides; this heat treated alloy exhibits superior mechanical properties for numerous industrial applications.Type: GrantFiled: April 11, 1983Date of Patent: September 25, 1984Inventors: Ranjan Ray, Viswanathan Panchanathan
-
Patent number: 4470847Abstract: A process to produce passified Group IVb transition metal based metal particles having a controlled particle size distribution is disclosed which produces particles suitable for metallurgy usage without additional particle size reduction. Such particles are also substantially free of halides and are produced at temperatures considerably below that of arc melting temperatures of Group IVb transition metals and alloys based thereon.Type: GrantFiled: November 8, 1982Date of Patent: September 11, 1984Assignee: Occidental Research CorporationInventors: Robert A. Hard, Joseph A. Megy
-
Patent number: 4464206Abstract: A process for producing a wrought product of improved ductility from substantially noncompactible prealloyed metal powder. The process comprises the steps of: comminuting substantially noncompactible prealloyed metal powder so as to flatten the particles thereof; heating the comminuted particles of metal powder at an elevated temperature, the particles adhering and forming a mass during heating; crushing the mass of metal powder; compacting the crushed mass of metal powder; sintering the metal powder; and hot working the metal powder into a wrought product. The wrought product has a chemistry which is substantially the same, with the exception of carbon and certain residuals, as the chemistry of the prealloyed powder.Type: GrantFiled: November 25, 1983Date of Patent: August 7, 1984Assignee: Cabot CorporationInventors: Prabhat Kumar, Ronald D. Rivers, Anthony J. Hickl
-
Patent number: 4464205Abstract: A powder metallurgical process for producing a wrought product characterized by a low level of residual impurities. The process comprises the steps of: comminuting metal powder to effect a reduction in particle size, at least 60% of the comminuted particles being capable of passing through a -270 mesh Tyler screen; blending the metal powder with a softer metal-bearing powder; heating the blended powder particles at an elevated temperature, the particles adhering and forming a mass during heating; crushing the mass of powder particles; cold-isostatically pressing the crushed mass of powder; sintering the powder in the absence of an encapsulating member under conditions which effect a reduction in the nitrogen, oxygen and carbon levels of the powder; and hot working the sintered powder into a wrought product. The wrought product has less than 0.015% carbon.Type: GrantFiled: November 25, 1983Date of Patent: August 7, 1984Assignee: Cabot CorporationInventors: Prabhat Kumar, Ronald D. Rivers, Anthony J. Hickl
-
Patent number: 4451429Abstract: A method of reclaiming precious metal incidentally sputtered into vacuum chamber walls, fixtures, and the like. The incidentally sputtered precious metal is reclaimed by grinding it into a metal powder that is useful as an electrical conductor in a cermet ink. Power can also be made by pulverizing the principally sputtered metal too.Type: GrantFiled: July 8, 1982Date of Patent: May 29, 1984Assignee: General Motors CorporationInventor: Morris Berg
-
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
-
Patent number: 4441927Abstract: An ingot-derived agglomerated tantalum powder composition comprising a select granular tantalum powder and including a critical proportion of a select flaked tantalum powder.Type: GrantFiled: November 16, 1982Date of Patent: April 10, 1984Assignee: Cabot CorporationInventors: Marlyn F. Getz, Michael J. Maggio, Billy F. Hitch
-
Patent number: 4432795Abstract: A sintered powdered titanium alloy article is provided which has a density approaching theoretical and which is characterized by having physical properties similar to those of a wrought titanium alloy article having the same chemical composition.Type: GrantFiled: February 16, 1982Date of Patent: February 21, 1984Assignee: Imperial Clevite Inc.Inventor: Phillip J. Andersen
-
Patent number: 4402905Abstract: The present invention is directed to a process for preparing a body of polycrystalline silicon doped with aluminum comprising melting a mixture of silicon powder and aluminum powder, rapidly quenching the melt, grinding the solidified silicon-aluminum alloy and hot pressing to form a compact.Type: GrantFiled: March 5, 1982Date of Patent: September 6, 1983Assignee: Westinghouse Electric Corp.Inventors: Michael A. Burke, Robert E. Gainer
-
Patent number: 4385944Abstract: A method for making magnetic crystallized implements based on glassy metal alloys. Metallic glass alloy powder of suitable ferromagnetic composition is compacted by mechanical, by adhesive bonding or by thermomechanical processes. The resulting compacts can be heat treated to enhance magnetic properties. Compacted bodies exhibit excellent ferromagnetic properties, low remanence, low coercivity and high permeabilities.Type: GrantFiled: May 29, 1980Date of Patent: May 31, 1983Assignee: Allied CorporationInventor: Ryusuke Hasegawa
-
Patent number: 4373675Abstract: A method is disclosed of converting tangled ribbons of ductile machining scrap into a densified intermediate product useful for making metal powder. A collection of the scrap having a packing density less than 50 lbs/ft.sup.3 is subjected to impacting forces between weighted, freely moving elements and an anvil means for progressively flattening the scrap. The impacting is repeated to substantially flatten all of the scrap and reduce some of the ribbons by fatigue breakage to chips; the resulting processed scrap will have a packing density in excess of 90 lbs/ft.sup.3.Type: GrantFiled: November 17, 1980Date of Patent: February 15, 1983Assignee: Ford Motor CompanyInventor: Sydney M. Kaufman
-
Patent number: 4369078Abstract: This invention relates to a process and an apparatus for converting lump-size material, particularly scrap, of titanium metal or its alloys, preferably of low oxygen content, into powder-form material, which is useable for forming in a powder-metallurgical way pressings and workpieces, wherein the lump-size material is highly embrittled by charging with hydrogen, the embrittled material is size-reduced by means of size-reducing machines, particularly impeller breakers, impact mills, hammer mills, impact hammer mills or hammer breakers, the size-reduced brittle material preferably having a particle size of less than about 10 mm and more particularly of less than about 6 mm is further size-reduced by means of at least one jet stream by impinging on a baffle plate or an anvil or on the particles of at least one other jet stream for the purpose of conversion into the powder-form material, and the powder-form material is converted into the ductile state by heating, preferably at temperatures above 450.degree. C.Type: GrantFiled: May 28, 1980Date of Patent: January 18, 1983Assignee: NYBY Uddeholm ABInventor: Christer Aslund