Carbon(c) Associated With More Than One Metal Patents (Class 75/241)
  • Patent number: 4840665
    Abstract: A wear-resistant sintered iron-based alloy and a process for producing the alloy are described, wherein the alloy comprises a first phase having a martensite composition which comprises from 0.5 to 3.0 wt % of Cr, from 0.4 to 1.0 wt % of Mn, from 0.1 to 0.4 wt % of Mo, and the balance of Fe, based on the total amount of said first phase; a second phase having a martensite and Cr carbide composition which comprises from 10 to 20 wt % of Cr and the balance of Fe, based on the total amount of said second phase; and from 1.0 to 2.5 wt % of C, based on the total amount of said alloy; wherein said first phase and said second phase are present as a mixture containing from 10 to 80% by volume of said second phase, based on the total volume of said alloy; and said alloy is substantially free from any residual austenite.
    Type: Grant
    Filed: January 14, 1987
    Date of Patent: June 20, 1989
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Satoshi Fujii
  • Patent number: 4836848
    Abstract: An Fe-base sintered alloy for valve seats for use in internal combustion engines and a method of manufacturing the same are provided. The alloy consists essentially of 0.6 to 1.3% C, 1 to 5% Cr, 4 to 15% Mo, 0.5 to 2% Ni, 2 to 8% Co, 0.2 to 2% Nb, 0.2 to 2% at least one lubricating component selected from the group consisting of a CaF.sub.2 and BaF.sub.2 and the balance of Fe and inevitable impurities. Starting powders are blended into the same composition as above, and mixed into a mixed powder. The mixed powder is pressed into a green compact. Then, the green compact is presintered, hot forged, sintered, and, if required, further heat treated, in sequence to be formed into an Fe-base sintered alloy having a structure wherein particles of the at least one lubricating component and hard particles of other components are dispersed in a matrix formed principally of a pearlite phase. The resulting alloy possesses a density of at least 7.3 g/cm.sup.
    Type: Grant
    Filed: October 2, 1987
    Date of Patent: June 6, 1989
    Assignee: Mitsubishi Kinzoku Kabushiki Kaisha
    Inventors: Osamu Mayama, Yoshimi Ishikawa
  • Patent number: 4828612
    Abstract: A cemented carbide cutting tool substrate has enhanced surface toughness due to binder enrichment and depletion of aluminum nitride near the peripheral surface.
    Type: Grant
    Filed: December 7, 1987
    Date of Patent: May 9, 1989
    Assignee: GTE Valenite Corporation
    Inventor: Warren C. Yohe
  • Patent number: 4820482
    Abstract: The present invention relates to a cemented carbide body, preferably for rock drilling, mineral cutting and wear parts, in which the content of binder phase in the surface is lower and in the center higher than the nominal content. In the center there is a zone having a uniform content of binder phase. The WC grain size is uniform throughout the body.
    Type: Grant
    Filed: May 5, 1987
    Date of Patent: April 11, 1989
    Assignee: Santrade Limited
    Inventors: Udo K. R. Fischer, Erik T. Hartzell, Jan G. H. Akerman
  • Patent number: 4808557
    Abstract: The present invention is characterized by ceramic materials comprising ceramic sintered bodies consisting of (1) 1-90 wt % chromium carbide and the remainder carbonic titanium nitride; (2) 1-90 wt % chromium carbide, 0.1-5 wt % B.sub.4 C and the remainder titanium carbo-nitride; or (3) either of the above compositions plus less than 95 wt % of a metal boride such as Ti or Zr. Such ceramic sintered bodies are used for cutting tools or wear-resistant machine parts because of their high density, high hardness and high strength.
    Type: Grant
    Filed: June 30, 1987
    Date of Patent: February 28, 1989
    Assignees: Kyushu Director of Institute, Itaru Todoroki, Tokyo Kokyu Rozai Co., Ltd.
    Inventors: Tadahiko Watanabe, Kazuhisa Shobu, Yuko Tsuya, Yuji Enomoto, Junshiro Hayakawa, Osamu Yagishita, Hideki Yamamoto, Eiichi Sudoh
  • Patent number: 4790875
    Abstract: An abrasion resistant alloy sintered in a liquid phase, which contains, by weight, 1.5 to 4.0% C, 0.5 to 1.2% Si, 1.0% or less Mn, 2.0 to less than 20.0% Cr, 0.5 to 2.5% Mo, 0.2 to 0.8% P, and the balance of Fe. The alloy is suitable for fabricating sliding parts in internal combustion engines, such as valve mechanisms.
    Type: Grant
    Filed: February 16, 1988
    Date of Patent: December 13, 1988
    Assignee: Nippon Piston Ring Co., Ltd.
    Inventors: Shigeru Urano, Osamu Hirakawa
  • Patent number: 4780139
    Abstract: A vanadium-containing power tool steel is disclosed. The steel is compacted to full density at high temperature and presence and contains M.sub.6 C or M.sub.7 C.sub.3 carbides. The carbides have an effective maximal size of 4 to 15 microns.
    Type: Grant
    Filed: January 16, 1986
    Date of Patent: October 25, 1988
    Assignee: Kloster Speedsteel AB
    Inventors: Per I. Hellman, Henry L. Wisell
  • Patent number: 4778522
    Abstract: A wear resistant iron-base sintered alloy consists essentially of at least one selected from the group consisting of molybdenum and tungsten, ranging from 5 to 20% by weight, chromium ranging from 2 to 10% by weight, silicon ranging from 0.1 to 0.9% by weight, manganese ranging not more than 0.7% by weight, phosphorus ranging not more than 0.05% by weight, carbon ranging from 0.1 to 0.8% by weight, boron ranging from 0.5 to 2.0% by weight, and balance including iron and an impurity, so that fine multiple carbide, multiple boride, and/or multiple carbide-boride can be homogeneously dispersed as hard grains in the structure of a matrix, thereby exhibiting excellent wear resistance, scuffing resistance and pitting resistance.
    Type: Grant
    Filed: March 9, 1987
    Date of Patent: October 18, 1988
    Assignees: Nissan Motor Co., Ltd., Hitachi Powdered Metals Co., Ltd.
    Inventors: Yoshihiro Maki, Makoto Kano, Akira Fujiki, Ichiro Tanimoto, Hiroyuki Endo, Yukata Ikenoue, Kei Ishii
  • Patent number: 4765836
    Abstract: A powder-metallurgy alloy article having a good combination of wear resistance and corrosion resistance. The article is further characterized by an attainable minimum hardness after heat treatment of 60R.sub.c and a martensitic structure. The article is made from prealloyed particles of the composition, in percent by weight, carbon 2.5-5, manganese 0.2-1, phosphorus 0.10 maximum, sulfur 0.10 maximum, silicon 1 maximum, nickel 0.5 maximum, chromium 15-30, molybdenum, 2-10 vanadium 6-11, nitrogen 0.15 maximum and balance, iron. The article has a fine, uniform distribution of a MC and other carbide phases.
    Type: Grant
    Filed: December 11, 1986
    Date of Patent: August 23, 1988
    Assignee: Crucible Materials Corporation
    Inventors: John J. Hauser, William Stasko, Kenneth E. Pinnow
  • Patent number: 4753678
    Abstract: A sintered hard metal having superior toughness and superior hardness may be used for micro-drills, tools and wear resistant parts. The metal is a cemented carbide WC formed from tungsten carbide WC as the base alloy and containing 4 to 20 percent by weight of vanadium carbide VC or zirconium nitride. Its micro-structure is that the WC or WC-VC particles are 0.6.mu. or less, its Rockwell Hardness HRA is at least 91.5 and its transverse rupture strength is at least 350 kg/mm.sup.2.
    Type: Grant
    Filed: February 25, 1986
    Date of Patent: June 28, 1988
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Masao Maruyama, Atsushi Seki, Masayoshi Yatabe, Kotaro Hagiwara
  • Patent number: 4724000
    Abstract: Wear resistant articles, especially valve seat inserts for internal combustion engines, are produced as sintered metal compacts comprising interspersed microzones of prealloyed austenitic stainless steel and softer ferrous metal, the microzones of austenitic stainless steel containing carbides and carbonitrides. The sintered compacts can be made by forming a green compact from prealloyed austenitic stainless steel powder atomizate blended with softer powdered ferrous metal component and powdered carbon, and sintering the green compact.
    Type: Grant
    Filed: October 29, 1986
    Date of Patent: February 9, 1988
    Assignee: Eaton Corporation
    Inventors: Jay M. Larson, Sundaram L. Narasimhan, David L. Bonesteel, John N. Gilmer
  • Patent number: 4722751
    Abstract: A light weight and high strength aluminum alloy and a process for producing such an alloy, which alloy is suitable for forming automotive engine components, including pistons. In a preferred embodiment, 80 to 99.5% by volume of an aluminum alloy powder or a mixed powder composed of pure metal powders or master alloy powders is blended with 0.5 to 20% by volume of at least one of carbon or graphite powder, an oxide powder, a carbide powder and a nitride powder. The blend is then mechanically alloyed, following which the thereby-obtained powder is subjected to working such as by compaction and hot forging, hot pressing, cold isostatic pressing and hot forging, or cold isostatic pressing and hot extrusion.
    Type: Grant
    Filed: December 19, 1984
    Date of Patent: February 2, 1988
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Kiyoaki Akechi, Nobuhito Kuroishi
  • Patent number: 4705565
    Abstract: 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: Grant
    Filed: June 25, 1986
    Date of Patent: November 10, 1987
    Inventors: Robert J. Beltz, Joseph D. Dankoff
  • Patent number: 4704336
    Abstract: A solid particle erosion resistant coating includes angular titanium carbide particles uniformly dispersed through a high chromium iron matrix. In one form, the aggregate comprises, by weight, about 30-50% TiC, about 10-30% Cr, about 1.5-5% C and the balance essentially iron in the form of ferrite. The matrix also includes metallurgically identifiable amounts of high chromium content M.sub.7 C.sub.3 carbides therethrough. The coating does not exhibit austenitic or martensitic structure therethrough. A powder alloy consolidated body also includes a surface adjacent region having a similar TiC and high chromium iron matrix. Further, a method for obtaining the coating includes heating above the austenitization temperature of the matrix alloy and below the melting temperature of iron, and cooling the aggregate so as to attain iron in the form of ferrite in the matrix.
    Type: Grant
    Filed: March 5, 1986
    Date of Patent: November 3, 1987
    Assignee: General Electric Company
    Inventor: Donald R. Spriggs
  • Patent number: 4702771
    Abstract: Wear-resistant, sintered iron alloys are provided. The alloys have a structure in which iron-based hard particles having a relatively high Cr content and copper or copper alloy particles are dispersed in an iron alloy matrix containing a relatively low content of Cr. The alloys are prepared by compression molding powders of the matrix alloy, the hard alloy, copper or copper alloy, an Fe-P alloy and graphite and sintering the obtained molding at a temperature of 980.degree. to 1130.degree. C.
    Type: Grant
    Filed: April 4, 1986
    Date of Patent: October 27, 1987
    Assignees: Hitachi Powdered Metals Co., Ltd., Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Yoshiaki Takagi, Yoshihiro Katsui, Hiroyuki Endo, Yutaka Ikenoue
  • Patent number: 4702769
    Abstract: There is disclosed a sintered alloy for decoration comprising2 to 30% by weight of a binding phase comprising one or more elements selected from the group consisting of Fe, Ni, Co, Cr, Mo and W;0 to 10% by weight of a strengthening phase comprising one or more material selected from the group consisting of a metal, an alloy, a metal oxide, a metal nitride and a metal carbide;the balance of a hard phase represented by the formula:(Tia, Mb) (Nw, Cx, Oy)z(wherein M, A, b, w, x, y and z are defined in the specification); andinevitable impurities.The sintered alloy for decoration according to this invention possesses both a decorativeness suitable for decorative members as well as excellent corrosion resistance and mechanical properties.
    Type: Grant
    Filed: March 10, 1983
    Date of Patent: October 27, 1987
    Assignee: Toshiba Tungaloy Co., Ltd.
    Inventors: Mikio Fukuhara, Tetsuya Mitsuda
  • Patent number: 4696696
    Abstract: A wear resistant sintered alloy consisting essentially of from 2.0% to 3.5% by weight of C, from 0.3% to 0.8% by weight of P, from 0.5% to 3.0% by weight of Mn and remainder Fe. The alloy is sintered in the liquid-phase.
    Type: Grant
    Filed: June 4, 1986
    Date of Patent: September 29, 1987
    Assignee: Nippon Piston Ring Co., Ltd.
    Inventors: Yoshiaki Fujita, Satoshi Kawai
  • Patent number: 4693746
    Abstract: A cBN sintered compact for an end mill obtained by sintering mixed powder prepared by mixing about 35 to 50 percent by volume of cubic boron nitride powder smaller than about 2 .mu.m in average particle size with about 50 to 65 percent by volume of a binder under cBN-stable superhigh pressure conditions. The binder contains about 20 to 30 percent by weight of Al and one or more Ti compounds selected from a group of TiN.sub.z, Ti(C,N).sub.z, TiC.sub.z, (Ti,M)C.sub.z, (Ti,M) (C,N).sub.z and (Ti,M)N.sub.z (where M indicates a transition metal element of the group IVa, Va or VIa of the periodic table excepting Ti and z is within a range of about 0.7.ltoreq.z.ltoreq. about 0.
    Type: Grant
    Filed: January 5, 1987
    Date of Patent: September 15, 1987
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Tetsuo Nakai, Mitsuhiro Goto
  • Patent number: 4684405
    Abstract: A sintered tungsten carbide material and method for manufacturing same in which the method includes the steps of combining metal particles composed of from 75 to 95 percent by weight of a composition containing at least 70 percent by weight of tungsten carbide and from 5 to 25 percent by weight of a binder metal composition, the binder metal composition consisting essentially of from 5 to 15 percent by weight of chromium and from 85 to 95 percent by weight of nickel; pressing the metal particles into a pressed body; sintering the pressed body in a sintering chamber for a period ranging from 20 to 200 minutes, at a temperature ranging from 1400.degree. to 1500.degree. C., and in a protective atmosphere which is one of a vacuum, a noble gas, a mixture of noble gases, and hydrogen gas to form a sintered body; and treating the sintered body for a period ranging from 20 to 200 minutes, at a temperature ranging from 1300.degree. to 1400.degree. C.
    Type: Grant
    Filed: March 28, 1986
    Date of Patent: August 4, 1987
    Assignee: Fried. Krupp GmbH
    Inventors: Johannes Kolaska, Norbert Reiter
  • Patent number: 4664706
    Abstract: Cams which meet all strength requirements and can be shrunk on a shaft can be made in a simple manner by sintering from a nickel- and copper-free mixture which comprises iron powder and contains 0.3 to 1.0 weight percent carbon and molybdenum and/or tungsten in such amounts that the sum of the molybdenums content and the tungsten content multiplied with the ratio of the atomic weight of molybdenum to the atomic weight of tungsten lies between 0.5 and 3 weight percent.
    Type: Grant
    Filed: April 10, 1986
    Date of Patent: May 12, 1987
    Assignee: Miba Sintermetall Aktiengesellschaft
    Inventor: Manfred Drozda
  • Patent number: 4639352
    Abstract: This invention relates to a hard alloy comprising two phases: a hard phase consisting of at least one compound having a crystal structure of simple hexagonal MC type (M: metal; C: carbon) selected from the group consisting of mixed carbides, carbonitrides and carboxynitrides of molybdenum and tungsten, and a binder phase consisting of at least one element selected from the group consisting of iron, cobalt and nickel. The hard phase is prepared by carburizing an (Mo, W) alloy obtained by reducing oxides of molybdenum and tungsten with a particle size of at most 1 micron, is composed of coarse particles with a mean particle size of at least 3 microns, and has a uniform molybdenum to tungsten ratio in the particles. The hard alloy has a gross composition within the range of the shaded portion ABCDEA in FIG. 1.
    Type: Grant
    Filed: December 13, 1985
    Date of Patent: January 27, 1987
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Mitsuo Kodama, Masaya Miyake, Minol Nakano, Tsuyoshi Asai, Akio Hara
  • Patent number: 4636252
    Abstract: 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: Grant
    Filed: May 14, 1984
    Date of Patent: January 13, 1987
    Assignee: Mitsubishi Kinzoku Kabushiki Kaisha
    Inventors: Hironori Yoshimura, Jhunichi Toyama
  • Patent number: 4615734
    Abstract: A solid particle erosion resistant coating includes angular titanium carbide particles uniformly dispersed through a high chromium iron matrix. In one form, the aggregate comprises, by weight, about 30-50% TiC, about 10-30% Cr, about 1.5-5% C and the balance essentially iron in the form of ferrite. The matrix also includes metallurgically identifiable amounts of high chromium content M.sub.7 C.sub.3 carbides therethrough. The coating does not exhibit austenitic or martensitic structure therehthough. A powder alloy consolidated body also includes a surface adjacent region having a similar TiC and high chromium iron matrix. Further, a method for obtaining the coating includes heating above the austenitization temperature of the matrix alloy and below the melting temperature of iron, and cooling the aggregate so as to attain iron in the form of ferrite in the matrix.
    Type: Grant
    Filed: February 7, 1985
    Date of Patent: October 7, 1986
    Assignee: General Electric Company
    Inventor: Donald R. Spriggs
  • Patent number: 4610931
    Abstract: Cemented carbide substrates having substantially A or B type porosity and a binder enriched layer near its surface are described. A refractory oxide, nitride, boride, and/or carbide coating is deposited on the binder enriched surface of the substrate. Binder enrichment is achieved by incorporating Group IVB or VB transition elements. These elements can be added as the metal, the metal hydride, nitride or carbonitride.
    Type: Grant
    Filed: March 8, 1984
    Date of Patent: September 9, 1986
    Assignee: Kennametal Inc.
    Inventors: Bela J. Nemeth, George P. Grab
  • Patent number: 4605440
    Abstract: Hard, tough, lightweight boron-carbide-reactive metal composites, particularly boron-carbide-aluminum composites, are produced. These composites have compositions with a plurality of phases. A method is provided, including the steps of wetting and reacting the starting materials, by which the microstructures in the resulting composites can be controllably selected. Starting compositions, reaction temperatures, reaction times, and reaction atmospheres are parameters for controlling the process and resulting compositions. The ceramic phases are homogeneously distributed in the metal phases and adhesive forces at ceramic-metal interfaces are maximized. An initial consolidation step is used to achieve fully dense composites. Microstructures of boron-carbide-aluminum cermets have been produced with modulus of rupture exceeding 110 ksi and fracture toughness exceeding 12 ksi.sqroot.in. These composites and methods can be used to form a variety of structural elements.
    Type: Grant
    Filed: May 6, 1985
    Date of Patent: August 12, 1986
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Danny C. Halverson, Aleksander J. Pyzik, Ilhan A. Aksay
  • Patent number: 4574011
    Abstract: 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: Grant
    Filed: March 6, 1984
    Date of Patent: March 4, 1986
    Assignee: Stellram S.A.
    Inventors: Christian Bonjour, Francois Duvanel
  • Patent number: 4563329
    Abstract: A powder alloy sheet including powders of wear-resistant eutectic alloy in a quantity of 85 to 97% in volume, and acrylic resin binder in a quantity of 15 to 3% in volume.There is also disclosed a method for forming a wear-resistant layer on a workpiece comprising steps of providing a powder alloy sheet comprised on 85 to 97 vol. % of powders of wear-resistant eutectic alloy and 15 to 3 vol. % of acrylic resin binder, bonding the sheet on a workpiece surface, heating the workpiece under a non-oxidizing atmosphere to a semi-liquid phase sintering temperature to sinter the alloy powder.
    Type: Grant
    Filed: October 31, 1983
    Date of Patent: January 7, 1986
    Assignee: Mazda Motor Corporation
    Inventors: Tuyoshi Morishita, Sigemi Ohsaki, Yashuhumi Kawado
  • Patent number: 4563215
    Abstract: A titanium nitride base cermet with high toughness comprises, by weight, 42 to 95% of TiN, 2 to 20% of one or more of Mo, W and the carbides thereof, 2.85 to 30% of an Ni, Co or a mixture thereof, and 0.15 to 8.0% of Al.sub.4 C.sub.3, with the balance being inevitable impurities, wherein half or less of TiN may be replaced with one or more of the carbides and/or carbonitrides of metals from the Groups IVa and Va of the periodic table, with the proviso that the amount of TiN is no less than 30% in the cermet.
    Type: Grant
    Filed: January 21, 1983
    Date of Patent: January 7, 1986
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Yoshihiro Yamamoto, Junichiro Suzuki
  • Patent number: 4514224
    Abstract: A titanium carbide base cermet with a high toughness which consists essentially of, in weight percentage, a dispersed phase of from 70 to 95% free from chromium carbide, and a binder phase of from 5 to 30%;(1) said dispersed phase consisting essentially of:(i) titanium nitride: from 10 to 25%,(ii) at least one of tungsten, molybdenum and carbides thereof: from 10 to 30%,(iii) zirconium carbide: from 0.2 to 5.0%,(iv) aluminum nitride: from 0.1 to 5.0%, and(v) A composite carbide produced by substituting at least one of tantalum carbide and niobium carbide for from 3 to 50% of titanium carbide: balance: and,(2) said binder phase consisting essentially of at least one metal of iron group and incidental impurities.
    Type: Grant
    Filed: November 22, 1983
    Date of Patent: April 30, 1985
    Assignee: Mitsubishi Kinzoku Kabushiki Kaisha
    Inventor: Kenichi Nishigaki
  • Patent number: 4481166
    Abstract: 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: Grant
    Filed: April 1, 1981
    Date of Patent: November 6, 1984
    Assignee: Kernforschungszentrum Karlsruhe GmbH
    Inventors: Helmut Holleck, Fritz Thuemmler, Leo Prakash
  • Patent number: 4473402
    Abstract: 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: Grant
    Filed: April 11, 1983
    Date of Patent: September 25, 1984
    Inventors: Ranjan Ray, Viswanathan Panchanathan
  • Patent number: 4469514
    Abstract: Fully dense consolidated powder alloys of iron, cobalt and/or nickel characterized by having an ultrafine microstructure exhibiting a substantially uniformly dispersed harding phase of particle size essentially less than 3 microns, are produced from prealloyed powders by rapidly quenching an atomized molten alloy charge and subjecting the solidified alloy powder particles to the step of hot consolidation to produce substantially fully dense metal stock directly from prealloyed powder.
    Type: Grant
    Filed: October 8, 1974
    Date of Patent: September 4, 1984
    Assignee: Crucible, Inc.
    Inventor: Frederick C. Holtz, Jr.
  • Patent number: 4466829
    Abstract: A WC-Ni-Co-Al-Cr system hard alloy suitable as a material for hot working apparatus members has a lower Co content than conventionally used WC-Co system alloys and contains in place thereof greater quantities of Ni and Al, whereby, and also because the oxygen content is suppressed at a low level, fine particles of .gamma.' phase (Ni.sub.3 Al) are precipitated in a binder phase which binds the disperse phase of WC to impart characteristics such as excellent toughness, abrasion resistance, high-temperature strength, and oxidation resistance.
    Type: Grant
    Filed: April 2, 1982
    Date of Patent: August 21, 1984
    Assignee: Mitsubishi Kinzoku Kabushiki Kaisha
    Inventors: Kenichi Nishigaki, Magoichi Takahashi, Keiichi Wakashima
  • Patent number: 4446196
    Abstract: Method for hard facing iron or iron base alloy substrates using as a hard facing material a solid composition consisting essentially of grains of vanadium carbide having in solid solution from about 10 to 50% by weight tungsten, and containing from about 0.5 to 5% by weight manganese and 0 to 3% by weight copper in the grain boundaries.
    Type: Grant
    Filed: June 28, 1982
    Date of Patent: May 1, 1984
    Assignee: Union Carbide Corporation
    Inventor: Harry J. Brown
  • Patent number: 4443255
    Abstract: Method for hard-facing substrates is disclosed using a hard facing material consisting essentially of at least one vanadium carbide. In a particular embodiment of the invention tungsten is present in the hard facing material in solid solution with vanadium carbide.
    Type: Grant
    Filed: November 9, 1981
    Date of Patent: April 17, 1984
    Assignee: Union Carbide Corporation
    Inventors: Harry J. Brown, William D. Forgeng, Charles W. Brown
  • Patent number: 4348232
    Abstract: An abrasion resistant ferro-based sintered alloy comprising 0.8 to 1.5% by weight of carbon, 0.5 to 2.5% by weight of chromium, 2.0 to 6.0% by weight of molybdenum, 1.5 to 5.0% by weight of nickel, 0.1 to 2.0% by weight of tungsten, 0.2 to 5.0% by weight of copper and the balance iron wherein said alloy contains molybdenum particles around which nickel is distributed and which are uniformly dispersed in the base structure comprising a mixture of pearlite, bainite and martensite and said alloy contains composite carbide of Fe-Cr-W-C dispersed in the base structure, is disclosed.
    Type: Grant
    Filed: May 7, 1980
    Date of Patent: September 7, 1982
    Assignee: Nippon Piston Ring Co., Ltd.
    Inventors: Takeshi Hiraoka, Shigeru Urano, Masajiro Takeshita, Keiji Nakamura
  • Patent number: 4345942
    Abstract: An abrasion resistered sintered alloy for use in internal combustion engines which comprises 0.5 to 4.0% by weight of carbon, 1.5 to 16.0% by weight of Nb, 0.1 to 4.0% by weight of Mo, 0.1 to 1.0% by weight of Ni and 0.1 to 5.0% by weight of P which permits liquid-phase sintering at temperatures not higher than 1,250.degree. C., and have 0.2 to 10% by volume of sintering pores at least 40% of which consist of pores having a pore size of not larger than 150 .mu.m is disclosed.
    Type: Grant
    Filed: April 24, 1980
    Date of Patent: August 24, 1982
    Assignee: Nippon Piston Ring Co., Ltd.
    Inventors: Kentaro Takahashi, Yoshikatsu Nakamura, Masajiro Takeshita
  • Patent number: 4345943
    Abstract: An abrasion resistant sintered alloy for use in internal combustion engines which comprises 0.5 to 4.0% by weight of C, 5.0 to 3.0% by weight of Cr, less than 10.0% by weight of at least one of Ni, Mo, Co and Cu, 0.1 to 5.0% by weight of at least one of P, B and Si which permits liquid-phase sintering at temperatures not higher than 1,250.degree. C. and the balance iron, and have hardness after sintering of Hv 500 to 1,200, 7 to 45% by area ratio of cementite or eutectic crystal of cementite and P and 0.2 to 10% by volume of sintering pores at least 40% of which consist of pores having a pore size of not larger than 150 .mu.m.
    Type: Grant
    Filed: April 24, 1980
    Date of Patent: August 24, 1982
    Assignee: Nippon Piston Ring Co., Ltd.
    Inventors: Kentaro Takahashi, Yoshikatsu Nakamura, Masajiro Takeshita
  • Patent number: 4334928
    Abstract: A sintered compact for use in a machining tool comprising 80 to 10 volume % of a high pressure form of boron nitride, and the balance a matrix of at least one binder compound material selected from the group consisting of a carbide, nitride, carbonitride, boride or silicide of IVa and Va transition metal of the periodic table, their mixtures as well as the solid solution of these compounds; the matrix forming a continuous bonding structure in the sintered body.A method of producing the compact comprises preparing a mix of 80 to 10 volume % of a high pressure form of a boron nitride powder with 20 to 90 volume % of at least one powdered binder compound selected from the group consisting of a carbide, a nitride, a carbonitride, a boride and a silicide of a IVa, or a Va metal, mixtures thereof or solid solutions of these compounds, and sintering the mix under pressures more than 20 Kb at temperatures higher than 700.degree. C. for more than 3 minutes.
    Type: Grant
    Filed: February 8, 1980
    Date of Patent: June 15, 1982
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Akio Hara, Shuji Yazu
  • Patent number: 4334926
    Abstract: 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: Grant
    Filed: March 12, 1980
    Date of Patent: June 15, 1982
    Assignee: Taiho Kogyo Co., Ltd.
    Inventors: Kenichiro Futamura, Tatsuhiko Fukuoka
  • Patent number: 4300952
    Abstract: An improvement in a cemented hard metal is disclosed. A molybdenum-tungsten-carbonitride is disclosed having the structure of tungsten carbide wherein the molybdenum and/or tungsten are at least partly substituted for by a metal selected from the group consisting of Cr, Nb, Ta, V, Re and mixtures thereof. The carbonitride may be mixed with a binder metal and sintered in a conventional manner to form a dense, substantially pore-free material.
    Type: Grant
    Filed: February 28, 1979
    Date of Patent: November 17, 1981
    Assignee: Sandvik Aktiebolag
    Inventors: Nils A. Ingelstrom, Leif A. E. Akesson
  • Patent number: 4300951
    Abstract: A liquid phase sintered dense composite body comprising a hard refractory metal carbide which is densely cemented by sintering with a metal or alloy components. The sintered composite body incorporates at a surface or in the interior a multiplicity of metallic elements consisting of coarse grains, strands and/or plates of either the same metal or alloy as the cementing component or metallic elements having a melting point at least 120.degree. C. higher than the temperature at which the liquid phase takes place on sintering. This liquid phase sintered dense composite body is manufactured by placing the coarse grains, strands and/or plates on the surface or within the compacted powder mixture prior to the liquid phase sintering operation.
    Type: Grant
    Filed: February 12, 1979
    Date of Patent: November 17, 1981
    Assignee: Kabushiki Kaisha Fujikoshi
    Inventor: Takeji Hachisuka
  • Patent number: 4263046
    Abstract: A workpiece of alloy steel is produced by sintering under a nonoxidizing atmosphere a mass of malleable-iron powder admixed with a comminuted complex ferroalloy. The latter, obtained from a molten mixture of several simple high-carbon ferroalloys saturated with graphite, is a blend of at least three nonferrous metals and iron in carbide form, including a complex carbide of formula M.sub.7 C.sub.3 containing iron and manganese with the possible addition of chromium and another carbide of formula M'.sub.2 C/M'C containing molybdenum with the possible addition of vanadium and/or niobium. The carbidically bound carbon amounts to at least 4%, by weight, of the ferroalloy composition and may constitute between 10% and 60% of the carbon of the sinterable powder mixture to which elemental carbon may be added as graphite. As the mass of iron and ferroalloy particles compacted under high pressure is sintered at temperatures between about 1150.degree. and 1300.degree. C.
    Type: Grant
    Filed: September 26, 1978
    Date of Patent: April 21, 1981
    Assignee: GfE Gesellschaft fur Elektrometallurgie mit beschrankter Haftung
    Inventors: Rudolf Fichte, Hans-Joachim Retelsdorf, Richard Jervis, Gunter Radel
  • Patent number: 4249945
    Abstract: A powder metallurgy tool steel article for use in applications requiring high wear resistance having a carbide content of 10 to 18 volume percent of substantially all MC-type vanadium carbides, which carbides are substantially spherical and uniformly dispersed; the carbon content of the article is balanced relative to the carbide formers vanadium, chromium and molybdenum to provide an amount of carbon in the matrix of the article sufficient to permit the article to be heat treated to a hardness of at least 56 R.sub.c.
    Type: Grant
    Filed: September 20, 1978
    Date of Patent: February 10, 1981
    Assignee: Crucible Inc.
    Inventors: Walter T. Haswell, August Kasak
  • Patent number: 4180401
    Abstract: A sintered steel alloy, particularly for hot-working tools, of the type comprising a hard metal compound such as titanium carbide and a matrix alloy of nickel martensitic steel containing at least a small amount of titanium, is featured by a substantially higher than usual molybdenum content providing an improvement in toughness and hardness when appropriately heat treated.
    Type: Grant
    Filed: June 28, 1977
    Date of Patent: December 25, 1979
    Assignee: Thyssen Edelstahlwerke Aktiengesellschaft
    Inventor: Fritz Frehn
  • Patent number: 4177324
    Abstract: Hard-facing of iron and iron base alloy substrates is disclosed using a hard facing material in the form of granules consisting essentially of grains of chemically combined vanadium, tungsten, molybdenum, and carbon bonded by a binder metal of nickel-molybdenum alloy.
    Type: Grant
    Filed: June 30, 1978
    Date of Patent: December 4, 1979
    Assignee: Union Carbide Corporation
    Inventors: Harry J. Brown, Kuldip S. Chopra
  • Patent number: 4171973
    Abstract: A sintered compact for use in a cutting tool and a method of producing the same are disclosed. The compact comprises 95 to 20 volume % of diamond finer than one micron in size and the balance binder also finer than one micron selected from the group of WC, (MoW)C, WC base cemented carbide and (MoW)C base cemented carbide.The method comprises pulverizing a diamond powder by using cemented carbide balls and a pot having a cemented carbide lining, mixing the diamond powder with a powder abraded from the balls and pot to produce a powder mix finer than one micron containing 95 to 20 volume % of diamond, heat-treating the powder mix in vacuum so as to degas, and hot-pressing the powder mix under high pressure at high temperature within the stable range of diamond.
    Type: Grant
    Filed: May 4, 1978
    Date of Patent: October 23, 1979
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Akio Hara, Shuji Yazu
  • Patent number: 4147538
    Abstract: Cobalt or cobalt alloy composite materials reinforced with continuous silicon carbide fibers, which have a high tensile strength, a low elongation, a high Young modulus and a high tensile strength at a high temperature, are produced by filling spaces in piles of the continuous silicon carbide fibers containing 0.01%-30% by weight of free carbon with melted or powdery metallic cobalt or cobalt alloy and integrating the said fibers with the said metal.
    Type: Grant
    Filed: January 21, 1977
    Date of Patent: April 3, 1979
    Assignee: The Research Institute for Iron, Steel and other Metals of the Tohoku University
    Inventors: Seishi Yajima, Hideo Kayano, Chiaki Asada, Makoto Saito
  • Patent number: 4145213
    Abstract: The alloy of the invention is of the type wherein 30-70% by volume of hard components are homogeneously dispersed in a matrix of binder metal (Fe, Co or Ni). The hard components are carbides or carbonitrides and/or borides of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and/or W. The mean grain size of the hard component particles is between 0.01 and 1.0 micron and their grain size distribution, represented by the standard deviation S, in which S.sup.2 .ltoreq.(M/1+1.5 M.sup.z).sup.2 .mu.m.sup.2, not more than 15% of the grains are larger than 1.2 microns.
    Type: Grant
    Filed: May 17, 1976
    Date of Patent: March 20, 1979
    Assignee: Sandvik Aktiebolg
    Inventors: Rolf G. Oskarsson, Carl S. G. Ekemar
  • Patent number: 4137076
    Abstract: An electrical contact suitable for use in high-current switching or circuit breaking, comprising a mixture of silver or copper with an alloy of tungsten carbide and titanium carbide. The contact material preferably uses from about 10% to about 90% silver by weight, the remainder being (WTi)C alloy, and preferably the alloy component comprises from about 35% to about 50% of WC, the remainder of the alloy being TiC. The contact is preferably made by a powder metallurgical process, and provides not only good impact resistance, weld resistance and erosion resistance but, even more importantly, provides low contact resistance, i.e. low electrical resistance when current flows through the closed contacts even after repeated cycling, as shown by the low temperature rise of the contact in use.
    Type: Grant
    Filed: February 24, 1977
    Date of Patent: January 30, 1979
    Assignee: Westinghouse Electric Corp.
    Inventors: Norman S. Hoyer, Paul G. Slade, Ram Kossowsky