Special Atmosphere Patents (Class 419/57)
  • Patent number: 9393618
    Abstract: The present disclosure relates to a method of making a sintered cutting body having a side with binder metal capping and another side without binder metal capping. The disclosure also relates to a sintered cutting body produced according to the method.
    Type: Grant
    Filed: July 3, 2014
    Date of Patent: July 19, 2016
    Assignee: SANDVIK INTELLECTUAL PROPERTY AB
    Inventors: Sven Englund, Jose Garcia
  • Publication number: 20150135897
    Abstract: The disclosure relates to the manufacture of metal articles, more specifically the manufacture of metal articles by additive manufacturing techniques, and in particular to the manufacture of metal articles by an additive manufacturing technique that may involve the selective melting or sintering of a metal powder. Examples of such techniques may include selective laser melting (SLM), selective laser sintering (SLS) and techniques that use an electron beam rather than a laser. Exemplary embodiments include a method of manufacture of an article including selective melting and/or sintering of a powder including an alloy containing aluminium, wherein the alloy contains bismuth.
    Type: Application
    Filed: May 28, 2013
    Publication date: May 21, 2015
    Inventors: Christopher John Sutcliffe, Peter Fox
  • Patent number: 8943693
    Abstract: The invention relates to a method for producing tooth parts from dental-grade metal powder, wherein existing CAD/CAM milling machines can be used. The essential process steps consist of: a) preparing a slurry from dental-grade metal powder, b) casting the slurry into a mold, c) drawing out (drying) suspension liquid (water) until a mechanically stable blank is obtained, d) milling the blank into the desired shape, e) oxygen-free sintering of the tooth parts milled from the blank. Because the blank is still present as a green body, milling does not place great demands on the milling machine in terms of mechanical stability and dust development. As a result, the operating speed and the service lives of customary milling machines are substantially increased.
    Type: Grant
    Filed: July 30, 2010
    Date of Patent: February 3, 2015
    Assignee: WDT-Wolz-Dental-Technik GmbH
    Inventor: Stefan Wolz
  • Patent number: 8876936
    Abstract: Disclosed herein is an engine valve seat, including: iron (Fe) as a main component; about 0.6˜1.2 wt % of carbon (C); about 1.0˜3.0 wt % of nickel (Ni); about 8.0˜11.0 wt % of cobalt (Co); about 3.0˜6.0 wt % of chromium (Cr); about 4.0˜7.0 wt % of molybdenum (Mo); about 0.5˜2.5 wt % of tungsten (W); about 1.0˜3.0 wt % of manganese (Mn); about 0.2˜1.0 wt % of calcium (Ca); and other inevitable impurities.
    Type: Grant
    Filed: December 12, 2011
    Date of Patent: November 4, 2014
    Assignees: Hyundai Motor Company, Kia Motors Corporation, Korea Sintered Metal Co., Ltd.
    Inventors: Ki Bum Kim, Eui Jun Kim, Seong Jin Kim, Sung Kweon Jang, Ki Jung Kim, Shin Gyu Kim, Jong Kwan Park, Sung Tae Choi
  • Patent number: 8852498
    Abstract: A process for fabricating hollow metal shells such as Be or Al filled with a selected gas such as D or T. An organic preform is coated with a slurry of organic binder and metal powder of Be or Al. The coated preform is heated to remove the preform and any organics to form a hollow shell which is then fired at an elevated temperature in a gas so as to seal the shell and capture the gas inside the sealed shell.
    Type: Grant
    Filed: April 20, 2012
    Date of Patent: October 7, 2014
    Assignee: Imaging Systems Technology, Inc.
    Inventor: Carol Ann Wedding
  • Patent number: 8840833
    Abstract: A component, such as a SOFC interconnect, and methods of making the component are provided using various chromium powders, including powder particles with a chromium core covered with an iron shell, a pre-alloyed Cr—Fe powder or a chromium powder produced by hydrogen reduction with hydrogen.
    Type: Grant
    Filed: November 21, 2011
    Date of Patent: September 23, 2014
    Assignee: Bloom Energy Corporation
    Inventors: Martin Janousek, Shivanand I. Majagi
  • Patent number: 8795489
    Abstract: [Problems] To provide a sputtering target that is capable of forming a Cu—Ga film to which Na is favorably added by a sputtering method, and a method for producing the same. [Means for Solving the Problems] The sputtering target is provided wherein 20 to 40 at % of Ga and 0.05 to 1 at % of Na are contained as metal components except fluorine (F) of the sputtering target, a remaining portion has a component composition consisting of Cu and unavoidable impurities, and Na is contained in the state of a NaF compound. Also, a method for producing the sputtering target includes the steps of forming a molded article consisting of a mixed powder of NaF powder and Cu—Ga powder or a mixed powder of NaF powder, Cu—Ga powder, and Cu powder; and sintering the molded article in a vacuum atmosphere, an inert gas atmosphere, or a reducing atmosphere.
    Type: Grant
    Filed: November 4, 2010
    Date of Patent: August 5, 2014
    Assignee: Mitsubishi Materials Corporation
    Inventors: Shoubin Zhang, Yoshinori Shirai
  • Publication number: 20140127072
    Abstract: A continuous sintering method for rare earth permanent magnetic alloy comprises: connecting a preparation chamber, a glove chamber and a sealed transmission chamber, a sealed chamber, a charging chamber, a preheating chamber, a heating and de-airing chamber, a sintering chamber and a cooling chamber one after another. A press formed blank of rare earth permanent magnetic alloy powder is transmitted under oxygen free condition, and processed with heating and de-airing, sintering and cooling. The preparation chamber, the glove chamber and the sealed transmission chamber are transmitted by bottom rollers, transmissions of other chambers are provided on a top portion of each chamber, and conveyed by roller rails. The rollers of the charging rack are suspended on rails of the transmissions. The drawer model charging rack is capable of loading multiple charging box.
    Type: Application
    Filed: November 8, 2013
    Publication date: May 8, 2014
    Applicant: SHENYANG GENERAL MAGNETIC CO., LTD
    Inventors: Xiaodong Chen, Baoyu Sun
  • Publication number: 20130287590
    Abstract: The present invention relates to a method for producing gas turbine components, in particular aircraft turbine components, preferably low-pressure turbine blades, from a powder which is sintered selectively in layers by locally limited introduction of radiant energy, wherein the sintering is carried out in a closed first housing (2), so that a defined atmosphere can be set, wherein the powder or at least a part of the powder is generated in the same first housing (2) or in a second housing connected to the first housing in a gas-tight manner. The invention further relates to a corresponding apparatus and to a gas turbine blade produced thereby.
    Type: Application
    Filed: January 11, 2012
    Publication date: October 31, 2013
    Applicant: MTU AERO ENGINES AG
    Inventors: Stefan Neuhaeusler, Bertram Kopperger, Josef Waermann, Andreas Jakimov, Erwin Bayer, Wilhelm Meir
  • Patent number: 8535605
    Abstract: The invention describes a method of producing a sinter-hardened component from a metallic powder containing chromium which is pre-alloyed in particular, comprising the steps of compacting the powder to form a green compact and then sintering the green compact in a reducing sintering atmosphere at a sintering temperature in excess of 1100° C. A gas containing carbon is added to the sintering atmosphere.
    Type: Grant
    Filed: May 29, 2008
    Date of Patent: September 17, 2013
    Assignee: MIBA Sinter Austria GmbH
    Inventors: Peter Orth, Gerold Stetina
  • Publication number: 20130149186
    Abstract: The invention relates to a device (10) and a method for sintering sinter products, such as oxidation-prone materials, in particular metallic sintered goods (46), in particular a dental framework, comprising a tray (18), which accommodates the sinter product and is arranged on a base plate (14), a pot-shaped cover (16), which surrounds the tray, with a rim (36) that is sealed towards the base plate, as well as supply and discharge openings (38) for protective gas connected to the interior chamber (30) that is surrounded by the pot-shaped cover. In order to facilitate sintering even at temperatures above 1200° C. without any problems, it is suggested that the tray (18) be covered by a capping element (20), whereby when the tray is covered by the capping element, the interior chamber (34) of the tray is connected in a gas-flow-allowing manner to the interior chamber of the cover.
    Type: Application
    Filed: December 10, 2012
    Publication date: June 13, 2013
    Inventors: Joerg HACHENBERG, Rudi STEINKE, Peter POPP, Irmgard WISSEL
  • Patent number: 8431071
    Abstract: A method of sintering by: placing a compacted metal powder inside a cylindrically-shaped susceptor and in an inert atmosphere or a vacuum, and applying microwave or millimeter-wave energy to the powder until the powder is sintered.
    Type: Grant
    Filed: August 27, 2010
    Date of Patent: April 30, 2013
    Assignee: The United States of America, as represented by the Secretary of the Navy
    Inventors: M Ashraf Imam, Arne W Fliflet
  • Patent number: 8361381
    Abstract: A process for making a diffusion hardened medical implant having a porous surface is disclosed. The medical implant is made by a hot isostatic pressing process which simultaneously forms that porous surface and the diffusion hardened surface.
    Type: Grant
    Filed: July 21, 2009
    Date of Patent: January 29, 2013
    Assignee: Smith & Nephew, Inc.
    Inventors: Daniel A. Heuer, Vivek Pawar, Marcus Lee Scott, Shilesh C. Jani
  • Patent number: 8309839
    Abstract: A method of improving the thermoelectric figure of merit (ZT) of a high-efficiency thermoelectric material is disclosed. The method includes the addition of fullerene (C60) clusters between the crystal grains of the material. It has been found that the lattice thermal conductivity (?L) of a thermoelectric material decreases with increasing fullerene concentration, due to enhanced phonon-large defect scattering. The resulting power factor (S2/?) decrease of the material is offset by the lattice thermal conductivity reduction, leading to enhanced ZT values at temperatures of between 350 degrees K and 700 degrees K.
    Type: Grant
    Filed: April 30, 2004
    Date of Patent: November 13, 2012
    Assignees: GM Global Technology Operations LLC, Shanghai Institute of Ceramics, Chinese Academy of Sciences
    Inventors: Lidong Chen, Xun Shi, Jihui Yang, Gregory P. Meisner
  • Patent number: 8206609
    Abstract: The present invention relates to a reducing agent for low temperature reducing and sintering of copper nanoparticles and a method for low temperature sintering using the same. The reducing agent includes formic acid or acetic acid and C1 to C3 alcohol or ether which allows reducing and sintering at a low temperature of less than 250° C. The sintered copper nanoparticles provide excellent electrical properties and are suitable for forming fine wirings patterns.
    Type: Grant
    Filed: May 4, 2009
    Date of Patent: June 26, 2012
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: In-Young Kim, Jae-Woo Joung, Young-Ah Song
  • Publication number: 20120051962
    Abstract: A method of sintering by: placing a compacted metal powder inside a cylindrically-shaped susceptor and in an inert atmosphere or a vacuum, and applying microwave or millimeter-wave energy to the powder until the powder is sintered.
    Type: Application
    Filed: August 27, 2010
    Publication date: March 1, 2012
    Applicant: THE GOVERNMENT OF THE UNITED STATES OF AMERICA, AS REPRESENTED BY THE SECRETARY OF THE NAVY
    Inventors: M. Ashraf Imam, Arne W. Fliflet
  • Patent number: 8075661
    Abstract: An ultra-hard composite material and a method for manufacturing the same, including mixing a metal carbide powder and a multi-element high-entropy alloy powder to form a mixture, green compacting the mixture, and sintering the mixture to form the ultra-hard composite material. The described multi-element high-entropy alloy consists of five to eleven principal elements, with every principal element occupying a 5 to 35 molar percentage of the alloy.
    Type: Grant
    Filed: April 25, 2008
    Date of Patent: December 13, 2011
    Assignee: Industrial Technology Research Institute
    Inventors: Chi-San Chen, Chih-Chao Yang, Jien-Wei Yeh, Chin-Te Huang
  • Patent number: 8071015
    Abstract: Disclosed is a process of producing a porous metal body containing a metal component which is likely to be oxidized, by which process the amounts of residual carbon and residual oxygen therein are decreased, and by which the performance of the product porous body can be largely promoted. The process for producing a porous metal body by sintering a material of the porous metal body, which material is obtained by coating a slurry containing a metal powder and an organic binder on an organic porous aggregate, comprises a defatting step of treating the material of the porous metal body at a temperature not higher than 650° C.
    Type: Grant
    Filed: March 17, 2009
    Date of Patent: December 6, 2011
    Assignee: Taiyo Nippon Sanso Corporation
    Inventors: Tomohiro Wada, Tomoyuki Haneji, Shinichi Takahashi, Kiichi Kanda, Kenichi Watanabe
  • Patent number: 7931855
    Abstract: A method of reducing the oxygen content of a powder is provided. A canister is prepared with a getter, filled with the powder to be densified, sealed and evacuated. The canister is subjected to a hydrogen atmosphere at an elevated temperature whereby hydrogen diffuses into the canister through the walls thereof. The hydrogen forms moisture when reacted with the oxygen of the powder and the moisture in the reacted with the getter in order to remove oxygen from the powder to the getter. The atmosphere outside the canister is then altered to an inert atmosphere or vacuum, whereby hydrogen diffuses out of the canister. A dense body having a controlled amount of oxygen can thereafter be produced by conventional powder metallurgy techniques.
    Type: Grant
    Filed: October 6, 2005
    Date of Patent: April 26, 2011
    Inventors: Roger Berglund, Hans Eriksson, Johan Sundstrom, Per Arvidsson
  • Publication number: 20100303664
    Abstract: There is provided a method for sintering a metal powder, such as a green body briquette of a metal powder, which includes heating the metal powder by at least one DFI burner providing a flame for contacting said metal powder which is directly exposed to the flame of the at least one DFI burner.
    Type: Application
    Filed: September 30, 2008
    Publication date: December 2, 2010
    Inventors: Jonas Adolfi, Henrik Gripenberg, Kosti Jylhä, David Muren
  • Patent number: 7718116
    Abstract: A method for obtaining a selectively non-carburized powdered metal part. The steps include compacting, sintering, removing, forging and cooling. A metal powder is compacted to form a preform having at least one first surface in which a forged part is required to have a case depth and at least one second surface in which a carburized portion is required to be removed prior to forging. The preform is then sintered and carburized. After carburizing the at least one second surface of the preform is removed and subsequently forged and cooled. The forged part has at least one second surface having improved post forging properties and at least one first surface having improved performance features. A part made from the present method is also provided.
    Type: Grant
    Filed: March 24, 2006
    Date of Patent: May 18, 2010
    Assignee: GKN Sinter Metals, Inc.
    Inventor: Timothy E. Geiman
  • Publication number: 20100055302
    Abstract: The present invention relates to a reducing agent for low temperature reducing and sintering of copper nanoparticles and a method for low temperature sintering using the same. The reducing agent includes formic acid or acetic acid and C1 to C3 alcohol or ether which allows reducing and sintering at a low temperature of less than 250° C. The sintered copper nanoparticles provide excellent electrical properties and are suitable for forming fine wirings patterns.
    Type: Application
    Filed: May 4, 2009
    Publication date: March 4, 2010
    Inventors: In-Young KIM, Jae-Woo Joung, Young-Ah Song
  • Publication number: 20100015463
    Abstract: One embodiment of the invention includes first particles comprising an intermetallic compound comprising titanium and aluminum; second particles comprising aluminum; and third particles comprising titanium.
    Type: Application
    Filed: December 21, 2007
    Publication date: January 21, 2010
    Inventor: June Sang Siak
  • Patent number: 7615185
    Abstract: After an alloy powder including W, Cr, at least one of Ti, Zr, and Hf, and at least one of V, Nb, and Ta is produced, the alloy powder, a powdery carbon material, and a catalyst are heat-treated in the presence of a nitrogen gas. The alloy powder is carbonitrided into a multicomponent ceramics powder, and sintered into a sintered body. Alternatively, a powder of a first substance including at least two of Ti, Al, V, Nb, Zr, Hf, Mo, Ta, Cr, and W is molded into a molded body. Then, the surface of the molded body is surrounded by a second substance including a metal element which is not contained in the powder of the first substance, and the molded body is heat-treated in an atmosphere in which N is present. A porous sintered body thus produced is crushed into a multicomponent ceramics powder.
    Type: Grant
    Filed: December 12, 2007
    Date of Patent: November 10, 2009
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventor: Mitsuo Kuwabara
  • Publication number: 20090220372
    Abstract: Disclosed is a low cost, low magnetostriction body which is decreased only in magnetostriction while maintaining magnetic characteristics such as loss and saturation magnetization at desired values. Also disclosed is a dust core using such a low magnetostriction body. Specifically disclosed is a low magnetostriction body obtained by shaping a soft magnetic material powder added with an organic compound having an effect of changing the magnetostriction of the soft magnetic material when combined with it, and heat-treating a green compact in an inert atmosphere. The absolute value of the magnetostriction ?O-P (1 T/50 Hz) of the low magnetostriction body is not more than 1.0×10?6. Also specifically disclosed is a dust core using such a low magnetostriction body.
    Type: Application
    Filed: May 23, 2006
    Publication date: September 3, 2009
    Inventors: Takeshi Hattori, Shin Tajima, Masaki Sugiyama, Hidefumi Kishimoto, Toshiya Yamaguchi, Tadayoshi Kikkou
  • Patent number: 7517492
    Abstract: Methods for sintering aluminum powder comprise providing aluminum powder and heating the aluminum powder in a nitrogen atmosphere containing a partial pressure of water vapor in the range of about 0.001 kPa to about 0.020 kPa to sinter the aluminum powder to a transverse rupture strength of at least about 13.8 MPa. The aluminum powder is not pressed together by a mechanical force that substantially deforms particles of said aluminum powder either prior to or during the step of heating. Articles comprising sintered aluminum powder. The sintered aluminum powder has a transverse rupture strength of at least about 13.8 MPa. The microstructure of the sintered aluminum powder contains no compositional concentration gradients indicative of the use of a sintering aid and no evidence of particle deformation having occurred by an application of a mechanical force prior to or during the sintering of the aluminum powder.
    Type: Grant
    Filed: December 1, 2003
    Date of Patent: April 14, 2009
    Assignee: The Ex One Company
    Inventor: Jianxin Liu
  • Patent number: 7498080
    Abstract: A particle (10) of ferromagnetic powder for use in preparation of soft magnetic core components has a core-shell structure. The particle includes a central core (12) and a shell (14) coated on the central core. The central core is made of magnetic material and is used for providing the necessary magnetic property for the magnetic core components made from the ferromagnetic powder. The shell has a higher electrical resistance than the central core so as to reduce an eddy current loss of the magnetic core component. The shell also functions to provide an excellent bonding strength between particles of the powder.
    Type: Grant
    Filed: April 3, 2006
    Date of Patent: March 3, 2009
    Assignee: Foxconn Technology Co., Ltd.
    Inventors: Chao-Nien Tung, Chuen-Shu Hou, Chih-Hao Yang, Lung-Wei Huang
  • Patent number: 7462217
    Abstract: The present invention relates to a process for the preparation of thermoelectric compositions of the formula InxCO4Sb12 (0<x<1), with a figure of merit greater than 1.0 and a composition made by that process.
    Type: Grant
    Filed: August 4, 2004
    Date of Patent: December 9, 2008
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Tao He, James J. Krajewski, Munirpallam Appadorai Subramanian
  • Patent number: 7347969
    Abstract: Provided is an iron-based sintered body with a rustproof function comprising a layer containing 0.01 to 5 at % of indium on the surface of the iron-based sintered body, or an iron-based sintered body with a rustproof function containing 0.01 to 5 at % of indium throughout the sintered body, and the iron-based sintered body having iron as its principal component is manufactured by performing sintering in a gas atmosphere containing indium vapor or indium. Thereby obtained is an iron-based sintered body, as well as the manufacturing method thereof, capable of easily improving the rustproof effect without having to hardly change the conventional process.
    Type: Grant
    Filed: September 1, 2003
    Date of Patent: March 25, 2008
    Assignee: Nippon Mining & Metals Co., Ltd
    Inventors: Masataka Yahagi, Toru Imori, Atsushi Nakamura
  • Patent number: 7097685
    Abstract: A cemented carbide comprises a binder phase consisting essentially of an iron family metal, a first hard phase consisting essentially of WC having a hexagonal crystal structure, and a second hard phase consisting essentially of one or more types of a compound of a metal or metals of group 4, 5 or 6 of the periodic table having an NaCl-type cubic crystal structure. The cemented carbide is formed by a surface region with a thickness of 2 to 50 ?m consisting of the binder phase and the first hard phase, and an inner region present underneath the surface region consisting of the binder phase, the first hard phase and the second hard phase. A ratio of an average grain size of the first hard phase in the surface region to an average grain size of the first hard phase in the inner region is 1 or less, and a ratio of an area of the binder phase in the surface region to an area of the binder phase in the inner region is greater than 1.
    Type: Grant
    Filed: August 25, 2004
    Date of Patent: August 29, 2006
    Assignee: Tungaloy Corporation
    Inventors: Hiroyuki Miura, Satoshi Kinoshita
  • Patent number: 6926777
    Abstract: The invention relates to a method for producing rod-shaped permanent magnets according to which pressed parts (2) are produced that are then assembled to a rod-shaped green product. Said green product is subsequently sintered, whereby a rod-shaped single-piece permanent magnet (1) is produced.
    Type: Grant
    Filed: December 19, 2000
    Date of Patent: August 9, 2005
    Assignee: Vacuumschmelze GmbH & Co. KG
    Inventors: Georg Werner Reppel, Volker Zellmann
  • Patent number: 6918943
    Abstract: A machining surface of a machining tool such as a drill is composed of a metal-rich section. A ceramics-rich section is formed centrally in the drill. Further, a gradient section is provided between the ceramics-rich section and the metal-rich section. In the gradient section, the composition ratio of metal is gradually increased from the ceramics-rich section to the metal-rich section. That is, the drill is composed of the gradient composite material in which the composition ratio of ceramics is increased and the composition ratio of metal is decreased inwardly from the machining surface.
    Type: Grant
    Filed: December 12, 2001
    Date of Patent: July 19, 2005
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Mitsuo Kuwabara, Masanori Ohtsuka
  • Patent number: 6881376
    Abstract: The present invention relates to a nuclear fuel body comprising tungsten network and a method for manufacturing the same, more particularly, a nuclear fuel body in which tungsten network is continuously formed over the entire or some parts of a sintered body and a method for manufacturing the same. The sintered body in the nuclear fuel body of the present invention contains tungsten network having excellent heat conductivity, leading to the enhancement of heat conductivity of the nuclear fuel sintered body itself with decreasing the temperature of the nuclear fuel, so that it can contribute to the improvement in safety and performance of nuclear fuel.
    Type: Grant
    Filed: October 2, 2003
    Date of Patent: April 19, 2005
    Assignees: Korea Atomic Energy Research Institute, Korea Hydro & Nuclear Power, Co., Ltd.
    Inventors: Kun Woo Song, Jae Ho Yang, Keon Sik Kim, Ki Won Kang, Jong Hun Kim, Youn Ho Jung
  • Patent number: 6821478
    Abstract: The invention relates to a method for sintering aluminium-based sintered parts which are, initially, guided with the aid of a transport system T through a de-binding area (3) before being guided through followed by a sintering area (2) and finally being guided through a cooling area (4). Inert gas atmosphere prevails in the sintering area (2), provided with an oxygen content, corresponding to a thawing point of, maximum, 40° C. The sintered parts (23) are heated to the required sintering temperature of 560-620° C., by means of convection, whereby the inert gas atmosphere is accordingly heated, flowing around said sintered parts in a corresponding manner.
    Type: Grant
    Filed: December 26, 2002
    Date of Patent: November 23, 2004
    Assignee: Eisenmann Maschinenbau KG
    Inventor: Hartmut Weber
  • Publication number: 20040187639
    Abstract: There is disclosed a compositionally graded sintered alloy which comprises: 1 to 40% by weight of a iron group metal; 0.1 to 10% by weight of at least one type of a specific metal element selected from the group consisting of Cr, Au, Ge, Cu; Sn, Al, Ga, Ag, In, Mn and Pb; a hard phase containing, as a main component, at least one compound selected from the group consisting of a carbide, a nitride and a mutual solid solution of a metal(s) which belongs to Group 4 (Ti, Zr, Hf), 5 (V, Nb, Ta) or 6 (Cr, Mo, W) of the Periodic Table; and inevitable impurities, wherein the content of the specific metal element gradually increases from a surface of the sintered alloy toward an inner portion thereof, and a ratio of the average concentration of the specific metal element in a region which is at least 1 mm inside from the surface of the sintered alloy, to the average concentration of the specific metal element in a region between the surface and the position which is 0.
    Type: Application
    Filed: March 26, 2004
    Publication date: September 30, 2004
    Applicant: TOSHIBA TUNGALOY CO., LTD.
    Inventor: Masaki Kobayashi
  • Publication number: 20040166014
    Abstract: Disclosed is a densification process of a W—Cu composite material, and more particularly, a sintering method for a W—Cu composite material without exuding of Cu. The sintering method comprises the steps of: holding a W—Cu composite power compact for a certain time at a Cu solid phase temperature or at a temperature just above a melting point and thus inducing a nearly complete densification; and sintering for a short time at a Cu liquidus temperature.
    Type: Application
    Filed: November 28, 2003
    Publication date: August 26, 2004
    Applicant: AGENCY FOR DEFENSE DEVELOPMENT
    Inventors: Eun-Pyo Kim, Moon-Hee Hong, Joon-Woong Noh, Seoung Lee, Sung-Ho Lee, Young-Do Kim, Dae-Gun Kim
  • Patent number: 6737015
    Abstract: A method for manufacturing composite materials from a parent substance containing silicon nitride and metal silicide, having fixed electrical properties. The molded articles are made, virtually with their final contours, prior to a sintering operation. The parent substance containing Si3N4 and a metal silicide is subjected to a gas pressure sintering in a nitrogenous atmosphere. The metal silicide is of the form Me5Si3, where Me is a metal. As a function of a sintering temperature, a lower limit of partial nitrogen pressures is selected so that Si3N4 is stable at the lower limit and an upper limit of the partial nitrogen pressures is selected so that Me5Si3 is stable at the upper limit. The resulting composite material is a silicon-containing composite material made of Si3N4 and the metal silicide. The metal silicide is selected from the group of Nb5Si3, V5Si3, Ta5Si3 and W5Si3.
    Type: Grant
    Filed: November 1, 2000
    Date of Patent: May 18, 2004
    Assignee: Robert Bosch GmbH
    Inventors: Guenter Knoll, Gert Lindemann, Friederike Lindner, Matthias Wiedmaier
  • Patent number: 6696015
    Abstract: The method for producing a rare-earth sintered magnet of the present invention includes the steps of: compacting alloy powder for the rare-earth sintered magnet to form a green compact; loading the green compact into a case having a structure restricting a path through which gas flows between the outside and inside of the case, and placing a gas absorbent at least near the path; and sintering the green compact by heating the case including the green compact inside in a decompressed atmosphere.
    Type: Grant
    Filed: May 2, 2001
    Date of Patent: February 24, 2004
    Assignee: Sumitomo Special Metals Co., Ltd.
    Inventors: Koki Tokuhara, Akiyasu Oota, Tsuyoshi Wada, Katsumi Okayama, Tomoiku Ohtani, Kunitoshi Kanno
  • Patent number: 6638474
    Abstract: A coated cemented carbide tool, and a method for making the same, wherein the as-sintered substrate is formed by sintering in an atmosphere having at least a partial pressure and for a part of the time a nitrogen partial pressure.
    Type: Grant
    Filed: March 19, 2001
    Date of Patent: October 28, 2003
    Assignee: Kennametal Inc.
    Inventors: Yixiong Liu, Donald A. Botbyl, George P. Grab, Mark S. Greenfield
  • Patent number: 6630009
    Abstract: A paste composition, including a binding agent charged with metallic powder, to be used in a solid freeform fabrication procedure, comprising: a) a solidifiable binding agent comprised of at least one polymerizable resin, with a viscosity of less than 4000 mPa.s, measured at 25° C.; b) at least one initiator, in a concentration greater than about 0.1% by mass with respect to the mass of the resin; and c) a mixture of at least two metallic powders, said mixture having a volumetric concentration greater than 40% with respect to the composition, wherein said mixture of metal powders is either i) a bimodal or trimodal mixture in nature, or ii) is a majority of stainless steel with an amount of NiB or NiP and combinations thereof effective to lower the sintering temperature.
    Type: Grant
    Filed: April 3, 2002
    Date of Patent: October 7, 2003
    Assignee: 3D Systems, Inc.
    Inventors: Khalil M. Moussa, Kenneth J. Newell, Catherine Hinczewski, Charles H. Zenuk
  • Publication number: 20030143098
    Abstract: The invention relates to a method for sintering aluminium-based sintered parts which are, initially, guided with the aid of a transport system T through a de-binding area (3) before being guided through followed by a sintering area (2) and finally being guided through a cooling area (4). Inert gas atmosphere prevails in the sintering area (2), provided with an oxygen content, corresponding to a thawing point of, maximum, 40° C. The sintered parts (23) are heated to the required sintering temperature of 560-620° C., by means of convection, whereby the inert gas atmosphere is accordingly heated, flowing around said sintered parts in a corresponding manner.
    Type: Application
    Filed: December 26, 2002
    Publication date: July 31, 2003
    Inventor: Hartmut Weber
  • Publication number: 20030143097
    Abstract: An sintered iron-based powder metal body with outstandingly lower re-compacting load and having a high density and a method of manufacturing an iron-based sintered component with fewer pores of a sharp shape and having high strength and high density, the method comprising mixing,
    Type: Application
    Filed: October 25, 2002
    Publication date: July 31, 2003
    Applicant: KAWASAKI STEEL CORPORATION
    Inventors: Naomichi Nakamura, Satoshi Uenosono, Shigeru Unami, Masashi Fujinaga, Takashi Yoshimura, Mitsumasa Iijima, Shin Koizumi, Hiroyuki Anma, Yasuo Hatai
  • Publication number: 20030126945
    Abstract: A coated cemented carbide tool, and a method for making the same, wherein the as-sintered substrate is formed by sintering in an atmosphere having at least a partial pressure and for a part of the time a nitrogen partial pressure.
    Type: Application
    Filed: November 13, 2002
    Publication date: July 10, 2003
    Inventors: Yixiong Liu, Donald A. Botbyl, George P. Grab, Mark S. Greenfield
  • Publication number: 20030059332
    Abstract: A method of producing a ceramic matrix composite is provided, which production method reduces metal residual percentage within matrix with little energy consumption, without requiring special external heating means and special equipment while it is industrially simple and at a low price. It is a method of producing a ceramic matrix composite having the steps of filling mixed powder obtained by mixing metal powder and boron nitride powder into a predetermined container to form a green compact having a porous structure, and infiltrating the above described green compact with molten Al to form a composite material containing metal boride and having aluminum nitride as a matrix. The green compact is formed by compressing the mixed powder whose mixing ratio of metal powder to boron nitride powder is 1 : 1.8 to 1 : 2.2 (molar ratio) so that porosity of the green compact is 34 to 42%.
    Type: Application
    Filed: August 15, 2002
    Publication date: March 27, 2003
    Applicant: NGK Insulators, Ltd.
    Inventors: Makoto Kobashi, Naoyuki Kanetake, Takahiro Ishikawa, Masahiro Kida
  • Patent number: 6506338
    Abstract: A pressureless sintering process for producing FeAl wherein the heating rate is controlled in a manner which minimizes expansion of a mixture of elemental powders of iron and aluminum. During the process, the heating rate is maintained below 1° C./min to minimize the volume expansion during the formation of the intermediate phase Fe2Al5. As a result of the process, the final density can be increased up to 95% of the theoretical density. The sequence of phases formed during the heating of Fe+Al mixture were identified by X-ray diffraction, optical microscopy, SEM and along with DSC data were correlated to the expansion and shrinkage behavior of the samples.
    Type: Grant
    Filed: April 14, 2000
    Date of Patent: January 14, 2003
    Assignee: Chrysalis Technologies Incorporated
    Inventors: Shalva Gedevanishvili, Seetharama C. Deevi
  • Patent number: 6506226
    Abstract: The invention relates to a hard metal or cermet body with a hard material phase consisting of WC and/or at least one carbide, nitride, carbonitride and/or oxicarbonitride of at least one of the elements from group IVa, Va, or VIa of the periodic table and a binding metal phase consisting of Fe, Co and/or Ni, said binding metal phase making up 3 to 25 mass %. In particular, WC crystallites should protrude beyond the hard metal or cermet surface of the by 2 to 20 &mgr;m in order to improve the adhesion of surface layers that are applied.
    Type: Grant
    Filed: November 3, 2000
    Date of Patent: January 14, 2003
    Assignee: Widia GmbH
    Inventors: Limin Chen, Walter Lengauer, Hans Werner Daub, Klaus Dreyer, Dieter Kassel, José Garcia, Georg Korb
  • Publication number: 20030000611
    Abstract: In heat-treating a metallic alloy containing volatile metals such as zinc, manganese, chromium, aluminium, and so on in a tunnellike continuous furnace, argon is employed as a furnace atmosphere so that a pressure selectively produced by the argon atmosphere in the furnace is utilized for preventing the volatile metals from evaporating out of the metallic alloy during its heat-treatment. The argon employed as the furnace atmosphere and having a specific gravity higher than the air prevents also the air from entering into the furnace, and works also to purge the air which has happened to come into the furnace together with the metallic alloy, whereby the furnace atmosphere is kept constantly inert.
    Type: Application
    Filed: May 3, 2002
    Publication date: January 2, 2003
    Applicant: Kanto Yakin Kogyo Kabushiki Kaisha
    Inventor: Susumu Takahashi
  • Publication number: 20020197180
    Abstract: A green compact of a rare earth alloy magnetic powder is made by pressing the powder. The powder is pressed within an air environment that has a temperature controlled at 30° C. or less and a relative humidity controlled at 65% or less.
    Type: Application
    Filed: August 21, 2002
    Publication date: December 26, 2002
    Applicant: SUMITOMO SPECIAL METALS CO., LTD.
    Inventors: Koki Tokuhara, Shuhei Okumura, Akiyasu Oota
  • Patent number: 6482353
    Abstract: The method for manufacturing an R—Fe—B rare earth magnet of the present invention includes the steps of: compacting rare earth alloy powder having an oxygen content of 4000 wt. ppm or less by dry compacting under compression to produce a compact; impregnating the compact with an oil agent from the surface of the compact; and sintering the compact.
    Type: Grant
    Filed: October 31, 2000
    Date of Patent: November 19, 2002
    Assignee: Sumitomo Special Metals Co., Ltd.
    Inventors: Futoshi Kuniyoshi, Hitoshi Morimoto
  • Publication number: 20020168283
    Abstract: Boron powders are sintered and densified utilizing a microwave environment for so doing.
    Type: Application
    Filed: May 14, 2001
    Publication date: November 14, 2002
    Inventors: Marvin S. Morrow, Donald E. Schechter, Chin-Chi Tsai, C. Christopher Klepper, John Niemel, Robert C. Hazelton