Including Use Of Vacuum Patents (Class 148/223)
  • Patent number: 10689744
    Abstract: A method (100) for pressing at least one article in an arrangement as well as a pressing arrangement (500). The method comprises providing an article inside a load compartment and feeding a pressure medium into the pressure vessel and increasing (140) the pressure in the load compartment; increasing (120) the temperature and maintaining (150) the increased temperature and the increased pressure for selected periods of time (t1, t2); changing (170) the temperature from the first predetermined temperature level to a second predetermined temperature level (T2); feeding (180) a carbon-containing gas into the pressure vessel; maintaining (190) the second predetermined temperature level for a selected period of time (t3); reducing (200) the temperature in the load compartment; and discharging (210) the pressure medium from the pressure vessel and reducing (220) the pressure in the load compartment.
    Type: Grant
    Filed: March 24, 2015
    Date of Patent: June 23, 2020
    Assignee: Quintus Technologies AB
    Inventors: Soren Wiberg, Artur Miedzinski, Carl Silverhult, Anders Flodin, Dag Danielsson, Magnus Ahlfors, Stefan Sehlstedt
  • Patent number: 10246766
    Abstract: Low temperature gas carburization of stainless steel using acetylene as the carburizing specie is carried out under soft vacuum conditions in the presence of hydrogen or other companion gas. Carburization is made to go faster by including HCl or other carbon-free, halogen-containing activating compound in the carburizing gas being fed to the carburization reactor.
    Type: Grant
    Filed: January 18, 2017
    Date of Patent: April 2, 2019
    Assignee: SWAGELOK COMPANY
    Inventors: Sunniva R. Collins, Gerhard H. Schiroky, Steven V. Marx, Peter C. Williams
  • Patent number: 9704733
    Abstract: The present invention is to provide a storing container wherein Si does not drop onto a single crystal SiC substrate, and Si pressure distribution in an internal space can be made uniform. This storing container stores therein a single crystal SiC substrate to be etched by means of a heat treatment under Si vapor pressure. The storing container is formed of a tantalum metal, and has a tantalum carbide layer provided on an internal space side, and a tantalum silicide layer provided on the side further toward the internal space side than the tantalum carbide layer. The tantalum silicide layer supplies Si to the internal space. Furthermore, the tantalum silicide layer is different from adhered Si, and does not melt and drop.
    Type: Grant
    Filed: November 15, 2013
    Date of Patent: July 11, 2017
    Assignee: TOYO TANSO CO., LTD.
    Inventors: Satoshi Torimi, Norihito Yabuki, Satoru Nogami
  • Patent number: 9289828
    Abstract: A ball screw has a nut formed with a helical ball rolling groove on its inner circumference. A screw shaft is formed with a helical ball rolling groove on its inner circumference. The screw shaft is inserted into the nut. A number of balls are rollably contained within a ball rolling passage formed by oppositely arranged helical ball rolling grooves of the nut and the screw shaft, respectively. The nut is made of case hardened steel. The ball rolling groove is formed by cutting and surface hardening, by vacuum carburizing hardening, without any after-processing.
    Type: Grant
    Filed: October 30, 2009
    Date of Patent: March 22, 2016
    Assignee: NTN Corporation
    Inventors: Koji Tateishi, Hirakazu Yoshida
  • Patent number: 8986466
    Abstract: Provided is a method for carburizing a tantalum member whereby the tantalum member is less deformed by carburization and can be carburized with good flatness of the planar part thereof and in a uniform manner. The method is a method for subjecting a tantalum member 1 made of tantalum or a tantalum alloy and having a planar part 1a to a carburization process for allowing carbon to penetrate the member 1 from the surface toward the inner portion thereof and includes the steps of: setting the tantalum member 1 in a chamber 3 containing a carbon source by supporting the planar part 1a on a plurality of support rods 6 tapered at distal ends 6a thereof; and subjecting the tantalum member 1 to a carburization process by reducing in pressure and heating the interior of the chamber 3 to allow carbon derived from the carbon source to penetrate the tantalum member 1 from the surface thereof.
    Type: Grant
    Filed: May 25, 2010
    Date of Patent: March 24, 2015
    Assignee: Toyo Tanso Co., Ltd.
    Inventors: Yoshihisa Abe, Masanari Watanabe, Osamu Tamura
  • Publication number: 20150013848
    Abstract: A method for manufacturing a torque transmission mechanism between a starter motor and a crankshaft of an internal combustion engine, comprising a one-way clutch including an outer ring fast in rotation with the crankshaft via a front plate. This method comprises the following steps: a) forging the outer ring out of carburizing steel, b) carburizing the outer ring, c) tempering the outer ring, d) grinding an inner surface of the outer ring, e) manufacturing the front plate out of standard low equivalent carbon content steel, and f) assembling the front plate and the outer ring.
    Type: Application
    Filed: July 9, 2014
    Publication date: January 15, 2015
    Applicant: AKTIEBOLAGET SKF
    Inventors: Nicolas BERRUET, Charles CHAMBONNEAU, François CHAMPALOU, Richard CORBETT, Norbert HUHN, Yves-André LIVERATO, Patrice RIBAULT
  • Patent number: 8916004
    Abstract: A component of an implantable medical device comprises a body comprising at least one external surface, the body comprising at least one of titanium, titanium-based alloys, and composites thereof, and a corrosion-resistant surface region at the at least one external surface, the corrosion-resistant surface region comprising at least one of titanium nitride, dititanium nitride, and a solid solution of nitrogen dissolved in the body, wherein the corrosion-resistant surface region is formed by thermal nitridation of the body.
    Type: Grant
    Filed: June 29, 2011
    Date of Patent: December 23, 2014
    Assignee: Medtronic, Inc.
    Inventors: Michael B. Hintz, Peter D. Yurek, Brad C. Tischendorf, William J. Taylor
  • Patent number: 8894778
    Abstract: The present invention relates to a mechanical part, which is obtained by: processing a steel into a shape of a part, the steel having an alloy composition containing, by weight percent, C: 0.10 to 0.30%, Si: 0.50 to 3.00%, Mn: 0.30 to 3.00%, P: 0.030% or less, S: 0.030% or less, Cu: 0.01 to 1.00%, Ni: 0.01 to 3.00%, Cr: 0.20 to 1.00%, Al: 0.20% or less, N: 0.05% or less, and the remainder of Fe and inevitable impurities, and the alloy composition satisfying the following condition: [Si %]+[Ni %]+[Cu %]?[Cr %]>0.50, in which [Si %], [Ni %], [Cu %] and [Cr %] represent the concentration of Si, the concentration of Ni, the concentration of Cu and the concentration of Cr in the alloy composition, respectively; subjecting the steel to a carburizing treatment in a vacuum, followed by gradually cooling the steel; and subsequently subjecting the steel to a high-frequency hardening to thereby harden a surface of the steel.
    Type: Grant
    Filed: April 8, 2008
    Date of Patent: November 25, 2014
    Assignees: Daido Tokushuko Kabushiki Kaisha, Aisin Aw Co., Ltd.
    Inventors: Toshiyuki Morita, Kouji Ohbayashi, Masaki Kuwabara, Taro Matsukawa, Yutaka Eto, Kohki Mizuno
  • Patent number: 8753457
    Abstract: The present invention comprises a process for nitriding martensitic stainless steel and the alloy produced thereby comprising heating a stainless steel alloy to a temperature of from about 900° F. (480° C.) to about 2500° F. (1370° C.) in a vacuum furnace in the presence of hydrogen or argon gas in order to clean the surface. After the hydrogen or argon gas is removed from the chamber, nitrogen gas, or a different nitrogen gas derivative is injected into said furnace as a pulsed injection at a partial pressure of from about 500 torr to about 1000 torr. The steel is nitrogen alloyed at a temperature of from about 1400° F. (760° C.) to about 2200° F. (1205° C.) and then quickly quenched at ambient temperature. Preferably, after a sufficient period of time, the temperature is raised a second time from about 900° F. (480° C.) to about 2500° F. (1370° C.) prior to cooling the final product.
    Type: Grant
    Filed: May 15, 2012
    Date of Patent: June 17, 2014
    Inventor: Kenneth A. Moyer
  • Patent number: 8747519
    Abstract: A method selectively recovers a useful substance from waste including a chlorine-containing synthetic resin and metal copper in a mixed state. Metal copper is recovered from coated copper-wire waste. The method includes the steps of heat-treating the waste in form of coated copper wires, each having a coating material made of a chlorine-containing synthetic resin, in oil or under a non-oxygen condition. Here, the coating material is carbonized and a chlorine content of the coating material is reduced. Then the coating material and the copper wire are separated from each other the copper wire is recovered. The chlorine-containing synthetic resin can be treated without generating dioxin.
    Type: Grant
    Filed: November 21, 2012
    Date of Patent: June 10, 2014
    Assignees: Institute of National Colleges of Technology, Japan, Polytech Kagawa, Co., Ltd.
    Inventors: Hiroshi Okano, Gou Sajiki, Mitsunori Deguchi, Sadao Tanimoto
  • Patent number: 8741061
    Abstract: A method between a diffusion and a quenching process including normalizing by step cooling including alternating temperature lowering and temperature keeping treatment for a temperature history that satisfies a predetermined condition; after normalizing, maintaining the temperature of the whole workpiece so that the whole workpiece becomes the predetermined temperature, thereby producing fine crystal grains in the workpiece; then reheating the workpiece to raise its temperature to the second temperature. There is uniformity in temperature between the surface and the inside of a workpiece, and crystal grains are prevented from being coarse.
    Type: Grant
    Filed: February 22, 2012
    Date of Patent: June 3, 2014
    Assignee: IHI Corporation
    Inventor: Kazuhiko Katsumata
  • Publication number: 20140141912
    Abstract: A chain includes a plurality of sliding members that moves relative to each other. At least one of sliding members is formed of a martensitic stainless steel, and contains, in a superficial layer thereof, elemental substances of carbon and nitrogen at a range from 0.17 to 0.50 mass % in total, while a precipitation amount of carbide and nitride is 0.05 mass % or less in total.
    Type: Application
    Filed: November 13, 2013
    Publication date: May 22, 2014
    Applicant: Daido Kogyo Co., Ltd.
    Inventor: Jun BABA
  • Publication number: 20130292007
    Abstract: A method and apparatus for manufacturing a part. The part may be positioned in a chamber. The part may be comprised of a metal and may be a positioned part. A gas containing nitrogen may be sent into the chamber. An electromagnetic field may be generated in the chamber with the gas. The electromagnetic field may heat a portion of the metal in the positioned part to a temperature from about 60 percent to about 99 percent of the melting point of the metal such that the portion of the metal has a desired hardness. The portion of the metal may extend from a surface of the positioned part to a selected depth from the surface.
    Type: Application
    Filed: July 8, 2013
    Publication date: November 7, 2013
    Inventors: Dale J. Weires, Scott M. Holder, Julia C. Hess
  • Publication number: 20130186520
    Abstract: Low temperature gas carburization of stainless steel using acetylene as the carburizing specie is carried out under soft vacuum conditions in the presence of hydrogen or other companion gas. Carburization is made to go faster by including HCl or other carbon-free, halogen-containing activating compound in the carburizing gas being fed to the carburization reactor.
    Type: Application
    Filed: January 4, 2013
    Publication date: July 25, 2013
    Applicant: Swagelok Company
    Inventor: Swagelok Company
  • Patent number: 8465598
    Abstract: A vacuum carburization processing method includes a preparatory heating step of increasing the temperature of a workpiece in a heating chamber to a first temperature, a carburizing step of carburizing the workpiece by supplying carburizing gas into the heating chamber from a state where the pressure inside the heating chamber is reduced to an extremely low pressure, a diffusing step of terminating the supply of the carburizing gas and making carbon diffuse from a surface of the workpiece into its internal part, and a quenching step of abruptly cooling the temperature of the workpiece from a state where the temperature of the workpiece is at a second temperature; and also includes, between the diffusing step and the quenching step, a normalizing step of reducing the temperature of the workpiece so that the temperature history of the workpiece from the first temperature to a predetermined temperature satisfies predetermined conditions, a post-normalization maintaining step, performed after the normalizing step,
    Type: Grant
    Filed: September 25, 2007
    Date of Patent: June 18, 2013
    Assignee: IHI Corporation
    Inventor: Kazuhiko Katsumata
  • Publication number: 20130126048
    Abstract: The present invention comprises a process for nitriding martensitic stainless steel and the alloy produced thereby comprising heating a stainless steel alloy to a temperature of from about 900° F. (480° C.) to about 2500° F. (1370° C.) in a vacuum furnace in the presence of hydrogen or argon gas in order to clean the surface. After the hydrogen or argon gas is removed from the chamber, nitrogen gas, or a different nitrogen gas derivative is injected into said furnace as a pulsed injection at a partial pressure of from about 500 torr to about 1000 torr. The steel is nitrogen alloyed at a temperature of from about 1400° F. (760° C.) to about 2200° F. (1205° C.) and then quickly quenched at ambient temperature. Preferably, after a sufficient period of time, the temperature is raised a second time from about 900° F. (480° C.) to about 2500° F. (1370° C.) prior to cooling the final product.
    Type: Application
    Filed: May 15, 2012
    Publication date: May 23, 2013
    Applicant: MagnaTech P/M Labs
    Inventor: Kenneth H. Moyer
  • Patent number: 8425691
    Abstract: The present invention is directed to a process for tempering steel comprising carburizing said steel in a vacuum furnace in the presence of a hydrocarbon carburizing gas in combination with hydrogen wherein said carburizing gas/hydrogen combination is administered to the vacuum furnace by cyclically reducing the pressure in the furnace followed by the pulsed addition of the hydrocarbon carburizing gas consisting of an acetylene/hydrogen mixture is in a ratio of from about 1:1 to about 1:10 to replenish the air removed in the pressure reduction step.
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: April 23, 2013
    Inventor: Kenneth H. Moyer
  • Publication number: 20130006320
    Abstract: A component of an implantable medical device comprises a body comprising at least one external surface, the body comprising at least one of titanium, titanium-based alloys, and composites thereof, and a corrosion-resistant surface region at the at least one external surface, the corrosion-resistant surface region comprising at least one of titanium nitride, dititanium nitride, and a solid solution of nitrogen dissolved in the body, wherein the corrosion-resistant surface region is formed by thermal nitridation of the body.
    Type: Application
    Filed: June 29, 2011
    Publication date: January 3, 2013
    Applicant: MEDTRONIC, INC.
    Inventors: Michael B. Hintz, Peter D. Yurek, Brad C. Tischendorf, William J. Taylor
  • Patent number: 8343449
    Abstract: The disclosure provides a device and method used to produce a tubular structure made of a refractory metal compound. In particular, the disclosure provides a device and method used to produce a tubular structure made of a refractory metal compound by reacting a green tubular structure made of a refractory metal with at least one reactive gas.
    Type: Grant
    Filed: June 28, 2011
    Date of Patent: January 1, 2013
    Assignee: Nitride Solutions, Inc.
    Inventor: Jason Schmitt
  • Patent number: 8293028
    Abstract: A carburizing process for increasing the hardness of a case region of a steel component. In one form the application includes plating the outer surface of a stainless steel component with nickel prior to carburizing. One component includes a stainless steel object having a hardened case substantially free of continuous phase grain boundary carbides.
    Type: Grant
    Filed: January 19, 2010
    Date of Patent: October 23, 2012
    Assignee: Rolls-Royce Corporation
    Inventors: Stephen N. Hammond, Udayan Trivedi, Thomas L. Doubts, Douglas C. Steckbauer
  • Publication number: 20120255652
    Abstract: A method for improving surface mechanical properties of non-austenitic stainless steels comprises steps of: providing a non-austenitic stainless steel material; placing the non-austenitic stainless steel material in an environment containing at least one austenite-stabilizing element, and implanting the austenite-stabilizing elements into a surface of the non-austenitic stainless steel material to form a modified layer enriched with the austenite-stabilizing elements; and placing the non-austenitic stainless steel material in a carbon-bearing atmosphere to make the modified layer in contact with the carbon-bearing atmosphere, and maintaining the non-austenitic stainless steel material at a carburizing temperature below 600° C. to implant carbon into the modified layer to form a carburized layer.
    Type: Application
    Filed: April 7, 2011
    Publication date: October 11, 2012
    Inventors: Kuen-Shyang HWANG, Li-Hui CHENG, Yung-Chung LU, Yang-Liang FAN, Po-Han CHEN
  • Patent number: 8252130
    Abstract: Surface processing of titanium alloy members for aerospace equipment imparts high wear resistance, lubricity and high fatigue strength. The method includes an oxygen diffusion step for causing oxygen to diffuse and penetrate in solid solution form into a surface of a titanium alloy member under an oxygen-containing gas atmosphere and a particle bombardment step for bombarding the surface of the titanium alloy member with an airflow containing particles. The aerospace equipment can include a flap rail member and slat rail member for aircraft.
    Type: Grant
    Filed: February 16, 2005
    Date of Patent: August 28, 2012
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Kazuyuki Oguri, Takashi Kimura, Takahiro Sekigawa, Takayuki Takahashi
  • Publication number: 20120168033
    Abstract: The invention relates to a method and device for thermally treating workpieces, the device including a cooling chamber and two or more cementing chambers in which the workpieces are heated to a temperature of 950 to 1200° C. by means of direct heat radiation from a heating device.
    Type: Application
    Filed: September 6, 2010
    Publication date: July 5, 2012
    Applicant: Ald Vacuum Technologies GMBH
    Inventors: Volker Heuer, Klaus Loeser, Gunther Schmitt, Gerhard Welzig
  • Patent number: 8152935
    Abstract: There are provided a method, between a diffusion process and a quenching process, a normalizing process of performing step cooling in which a temperature lowering treatment and a temperature keeping treatment are alternately repeated plural times so that a temperature history from the first temperature to a predetermined temperature satisfies a predetermined condition; an after-normalizing maintaining process of maintaining the temperature of the whole workpiece for a predetermined time after the normalizing process so that the whole workpiece becomes the predetermined temperature, thereby producing fine crystal grains in the workpiece; and a reheating process of raising the temperature of the workpiece to the second temperature, after the after-normalizing keeping process.
    Type: Grant
    Filed: March 6, 2008
    Date of Patent: April 10, 2012
    Assignee: IHI Corporation
    Inventor: Kazuhiko Katsumata
  • Publication number: 20120082586
    Abstract: The present invention comprises the nitridization of stainless steel with a gaseous nitrogen compound such as nitrogen gas (N2), or ammonia (NH3) at high temperature wherein the reaction pressure is lowered. A base powder with properties similar to those of a martensitic stainless steel is prepared from a molten metal with the subsequent incorporation of selective additives such as cobalt, chromium, boron, copper, vanadium, niobium and mixtures thereof to improve high temperature resistance to scuffing and adhesive wear. The molten mixture is then atomized by water- or air-atomization to yield a base powder which is mixed with nitrogen or ammonia gas at various pressures in a static or fluidized bed to provide a nitrogen alloyed particulate, i.e., a nitrided particulate alloy. The powder is heated in a hot isostatic press under vacuum with argon gas at reduced pressure and later cooled to ambient (room) temperature.
    Type: Application
    Filed: November 22, 2010
    Publication date: April 5, 2012
    Applicant: Magna Tech P/M Labs
    Inventor: Kenneth H. Moyer
  • Publication number: 20120073568
    Abstract: Methods for depositing a coating on a metal surface can include heating a metal surface to a temperature not greater than its melting point; while heating the metal surface, applying a vacuum thereto; and while heating the metal surface, releasing the vacuum and backfilling with a first purge gas, where the first purge gas is reactive with the heated metal surface so as to deposit at least one layer of a coating thereon. The present methods can be used to deposit a coating in situ during the fabrication of solar receivers, in which the solar receivers contain an annulus defined by a metal tube as the inner surface and a material that is at least partially transparent to solar radiation as the outer surface.
    Type: Application
    Filed: September 19, 2011
    Publication date: March 29, 2012
    Applicant: APPLIED NANSTRUCTURED SOLUTIONS, LLC.
    Inventors: Matthew M. KAPELANCZYK, Tushar K. Shah
  • Publication number: 20120067462
    Abstract: Provided is a method for carburizing a tantalum member whereby the tantalum member is less deformed by carburization and can be carburized with good flatness of the planar part thereof and in a uniform manner. The method is a method for subjecting a tantalum member 1 made of tantalum or a tantalum alloy and having a planar part 1a to a carburization process for allowing carbon to penetrate the member 1 from the surface toward the inner portion thereof and includes the steps of: setting the tantalum member 1 in a chamber 3 containing a carbon source by supporting the planar part 1a on a plurality of support rods 6 tapered at distal ends 6a thereof; and subjecting the tantalum member 1 to a carburization process by reducing in pressure and heating the interior of the chamber 3 to allow carbon derived from the carbon source to penetrate the tantalum member 1 from the surface thereof.
    Type: Application
    Filed: May 25, 2010
    Publication date: March 22, 2012
    Applicant: TOYO TANSO CO., LTD.
    Inventors: Yoshihisa Abe, Masanari Watanabe, Osamu Tamura
  • Patent number: 8123873
    Abstract: A method for manufacturing a carburized part that includes vacuum carburizing a steel under a reduced pressure of 2 kPa or less, so that a surface carbon concentration after slow cooling performed after carburizing falls in a range of 0.9 to 1.5%, performing the slow cooling by air cooling at such a cooling rate that causes pearlite transformation, to transform a surface structure into pearlite; and thereafter, performing induction hardening under such heating and cooling conditions that produce fine carbides in a range of up to 0.1 mm from a surface by finely dividing cementite in the pearlite structure, where the fine carbides contain 90% or more of carbides of 1 ?m or less.
    Type: Grant
    Filed: September 18, 2009
    Date of Patent: February 28, 2012
    Assignee: Aisin AW Co., Ltd.
    Inventors: Koki Mizuno, Toshiyuki Morita
  • Publication number: 20120018052
    Abstract: The present invention is directed to a process for tempering steel comprising carburizing said steel in a vacuum furnace in the presence of a hydrocarbon carburizing gas in combination with hydrogen wherein said carburizing gas/hydrogen combination is administered to the vacuum furnace by cyclically reducing the pressure in the furnace followed by the pulsed addition of the hydrocarbon carburizing gas consisting of an acetylene/hydrogen mixture is in a ratio of from about 1:1 to about 1:10 to replenish the air removed in the pressure reduction step.
    Type: Application
    Filed: December 17, 2010
    Publication date: January 26, 2012
    Inventor: Kenneth H. Moyer
  • Patent number: 7988796
    Abstract: A method of manufacturing a sheave member for a belt-type continuously variable transmission includes a forming step wherein an intermediate product having a sheave surface is formed by forging a steel material; a carburization step wherein the intermediate product is heated in a carburization gas; a gradual cooling step wherein the cooling speed is equal to or less than 20° C./sec, at least until the temperature of the intermediate product has passed through the transformation point; a high-frequency electrical heating step wherein a selected portion(s) of the intermediate product is heated; a water quenching step wherein the selected portion is quenched by contact with water; and a finishing step wherein a grinding process is applied to the intermediate product to attain the final shape. In the cooling step, preferably, the intermediate product is contacted with a cooling gas at a pressure lower than atmospheric pressure.
    Type: Grant
    Filed: October 26, 2007
    Date of Patent: August 2, 2011
    Assignee: Aisin AW Co., Ltd.
    Inventors: Kouji Ohbayashi, Kazuaki Okada, Taro Matsukawa, Yutaka Eto, Koki Mizuno, Kazumichi Tsukuda
  • Patent number: 7967920
    Abstract: A method and measurement system for the control of an active charge surface in a low pressure carburizing process can avoid formation of by-products and achieve regular carburized layers. This can be achieved through sampling of outlet gas at a specified time and comparison with experimentally set model characteristics.
    Type: Grant
    Filed: March 31, 2008
    Date of Patent: June 28, 2011
    Assignees: Seco/Warwick S.A., Politechnika Lodzka
    Inventors: Piotr Kula, Józef Olejnik
  • Patent number: 7918944
    Abstract: A surface carburization technique of medical titanium alloy femoral head in total hip arthroplasty comprises subjecting medical titanium alloy TC4 to surface carburization by using acetylene as carburizing agent to carry out gaseous carburization at high temperature to give medical titanium alloy femoral head in total hip arthroplasty with TiC ceramic on surface thereof. The TiC ceramic layer on femoral head can be more than 100 micron thick, which is relatively thick, overcomes the disadvantages in available medical titanium alloy material, and is particularly useful for replacement of total hip or knee arthroplasty.
    Type: Grant
    Filed: April 10, 2008
    Date of Patent: April 5, 2011
    Assignee: China University of Mining and Technology
    Inventors: Shirong Ge, Yong Luo
  • Publication number: 20110067784
    Abstract: The invention relates to a process for the low-pressure carburisation of metal workpieces in an evacuable furnace, in which acetylene is added to the furnace atmosphere as the carburisation gas, wherein the partial pressure of the acetylene is varied intermittently and wherein the partial pressure of the acetylene in the furnace atmosphere is kept below 10 mbar. In order to specify a process for the low-pressure carburisation of metal workpieces that leads to an improvement, particularly with regard to the carburisation result, the invention proposes the use of a pot furnace as the furnace.
    Type: Application
    Filed: September 16, 2010
    Publication date: March 24, 2011
    Applicant: Hanomag Hartecenter GmbH
    Inventors: Winfried Gräfen, Karsten Seehafer, Friedrich Wilhelm Zur Weihen
  • Publication number: 20110017350
    Abstract: A carburizing process for increasing the hardness of a case region of a steel component. In one form the application includes plating the outer surface of a stainless steel component with nickel prior to carburizing. One component includes a stainless steel object having a hardened case substantially free of continuous phase grain boundary carbides.
    Type: Application
    Filed: January 19, 2010
    Publication date: January 27, 2011
    Inventors: Stephen N. Hammond, Udayan Trivedi, Thomas L. Doubts, Douglas C. Steckbauer
  • Patent number: 7811390
    Abstract: A method for producing a carburized part by carburizing a steel member under a vacuum in a decompression furnace while feeding carburizing gas comprises a step for forming an oxide film on at least a part of a surface of the steel member, a step for generating carbon by reducing the oxide film with the carburizing gas, and a step for carburizing the surface of the steel member under a vacuum by diffusing the carbon.
    Type: Grant
    Filed: March 21, 2008
    Date of Patent: October 12, 2010
    Assignee: Honda Motor Co., Ltd.
    Inventors: Kazuo Ishii, Tatsumi Tanaka
  • Publication number: 20100084051
    Abstract: A method for manufacturing a carburized part that includes vacuum carburizing a steel under a reduced pressure of 2 kPa or less, so that a surface carbon concentration after slow cooling performed after carburizing falls in a range of 0.9 to 1.5%, performing the slow cooling by air cooling at such a cooling rate that causes pearlite transformation, to transform a surface structure into pearlite; and thereafter, performing induction hardening under such heating and cooling conditions that produce fine carbides in a range of up to 0.1 mm from a surface by finely dividing cementite in the pearlite structure, where the fine carbides contain 90% or more of carbides of 1 ?m or less.
    Type: Application
    Filed: September 18, 2009
    Publication date: April 8, 2010
    Applicant: AISIN AW CO., LTD.
    Inventors: Koki Mizuno, Toshiyuki Morita
  • Publication number: 20090266449
    Abstract: A method of carburizing and quenching a steel member includes: a reduced pressure carburization step in which a steel member is contacted with carburization gas under reduced pressure, a slow cooling step in which the steel member is then slowly cooled in a cooling gas, and a quenching step of heating a selected portion of the cooled steel member using high-density energy and subsequently subjecting the selected portion to rapid cooling. The steel member subjected to the low-pressure carburization step includes a first portion in which a diffusion rate of carbon taken therein during carburization is high because of its shape and a second portion in which the diffusion rate of carbon is lower than that of the first portion. The reduced-pressure carburization step is controlled to give a carbon concentration at the surface of the first portion in a range of 0.65±0.1 weight % after diffusion.
    Type: Application
    Filed: April 22, 2009
    Publication date: October 29, 2009
    Applicant: AISIN AW CO., LTD.
    Inventors: Kouji OHBAYASHI, Kazuaki Okada
  • Patent number: 7575643
    Abstract: The invention provides a carburization treatment method in which the carburization treatment is conducted under a condition where an atmosphere within the furnace is maintained at a high carbon potential which is slightly blow a carbon solid solubility. Preferably, the internal pressure within the furnace is kept at 0.1 to 101 kPa, the hydrocarbon gas is one, two or more than two kinds of gases selected from the group consisting of C3H8, C3H6, C4H10, C2H2, C2H4, C2H6 and CH4, while the oxidative gas is an air, an O2 gas, or CO2 gas.
    Type: Grant
    Filed: March 28, 2002
    Date of Patent: August 18, 2009
    Assignee: Dowa Mining Co., Ltd.
    Inventors: Hisashi Ebihara, Jun Takahashi, Fumitaka Abukawa, Keiji Yokose, Hidetoshi Juryozawa
  • Publication number: 20090178733
    Abstract: The invention relates to a method of gas carburizing a metallic article, where at least the surface region of the article consists of an alloy with a chromium content of at least 10 wt %. The carburizing is carried out by means of a gas containing carbon, which gas is heated to a temperature below approximately 5500C. The gas is an un-saturated hydrocarbon gas.
    Type: Application
    Filed: June 21, 2006
    Publication date: July 16, 2009
    Inventors: Marcel Somers, Thomas Christiansen
  • Patent number: 7550049
    Abstract: The subject of this invention relates to method carburizing of steel products, mainly parts of machines, vehicles and every mechanical apparatus, in vacuum furnaces under reduced pressure and elevated temperature. The method of under-pressure carburizing of steel workpieces according to present invention relates to introduction of active nitrogen carrier during heating up of the load. Introduction of the active nitrogen carrier is terminated when the load reaches temperature required to start carburizing process; from this temperature the carbon carrier is added. Pressure in the furnace chamber during continuous or pulse introduction of the active nitrogen carrier should be maintained within the ranges from 1 to 500 mbar.
    Type: Grant
    Filed: July 2, 2003
    Date of Patent: June 23, 2009
    Assignees: Seco/Warwick S.A., Politechnika Lodzka
    Inventors: Piotr Kula, Jozef Olejnik, Paul Heilman
  • Patent number: 7513958
    Abstract: The subject of present invention relates to mixture for carburizing of steel products, mainly parts of machines, vehicles and every mechanical apparatus, used in vacuum furnaces. Present invention relates to mixture for under-pressure carburizing containing the carbon carrier comprising two unsaturated hydrocarbons, likely ethylene and acetylene, in volume ratio from 0.1 to 2.00. The carbon carrier can be further mixed with hydrogen or ammonia.
    Type: Grant
    Filed: July 2, 2003
    Date of Patent: April 7, 2009
    Assignees: Seco / Warwick S.A., Politechnika Lodzka
    Inventors: Piotr Kula, Jozef Olejnik, Paul Heilman
  • Publication number: 20090084470
    Abstract: A reduced-pressure heat treatment jig is used for supporting a workpiece of iron when the workpiece is subjected to heat treatment in a reduced-pressure atmosphere in which pressure is reduced compared to atmospheric pressure. The jig is formed of an iron material and is formed with a film on at least a contact surface with the workpiece, the film being formed of a material which persists during the heat treatment. The film preferably includes a metal oxide having an evaporating temperature higher than the heat treatment temperature in the reduced-pressure atmosphere. The film preferably contains aluminum oxide.
    Type: Application
    Filed: September 25, 2008
    Publication date: April 2, 2009
    Applicant: AISIN AW CO., LTD.
    Inventors: Susumu KATO, Nozomu Shinkou, Moriyuki Tabata, Keita Taguchi, Kazuaki Okada
  • Publication number: 20080257455
    Abstract: A surface carburization technique of medical titanium alloy femoral head in total hip arthroplasty comprises subjecting medical titanium alloy TC4 to surface carburization by using acetylene as carburizing agent to carry out gaseous carburization at high temperature to give medical titanium alloy femoral head in total hip arthroplasty with TiC ceramic on surface thereof. The TiC ceramic layer on femoral head can be more than 100 micron thick, which is relatively thick, overcomes the disadvantages in available medical titanium alloy material, and is particularly useful for replacement of total hip or knee arthroplasty.
    Type: Application
    Filed: April 10, 2008
    Publication date: October 23, 2008
    Inventors: Shirong Ge, Yong Luo
  • Publication number: 20080247901
    Abstract: The present invention relates to a mechanical part, which is obtained by: processing a steel into a shape of a part, the steel having an alloy composition containing, by weight percent, C: 0.10 to 0.30%, Si: 0.50 to 3.00%, Mn: 0.30 to 3.00%, P: 0.030% or less, S: 0.030% or less, Cu: 0.01 to 1.00%, Ni: 0.01 to 3.00%, Cr: 0.20 to 1.00%, Al: 0.20% or less, N: 0.05% or less, and the remainder of Fe and inevitable impurities, and the alloy composition satisfying the following condition: [Si %]+[Ni %]+[Cu %]?[Cr %]>0.50, in which [Si %], [Ni %], [Cu %] and [Cr %] represent the concentration of Si, the concentration of Ni, the concentration of Cu and the concentration of Cr in the alloy composition, respectively; subjecting the steel to a carburizing treatment in a vacuum, followed by gradually cooling the steel; and subsequently subjecting the steel to a high-frequency hardening to thereby harden a surface of the steel.
    Type: Application
    Filed: April 8, 2008
    Publication date: October 9, 2008
    Applicants: DAIDO TOKUSHUKO KABUSHIKI KAISHA, AISIN AW CO., LTD
    Inventors: Toshiyuki Morita, Kouji Ohbayashi, Masaki Kuwabara, Taro Matsukawa, Yutaka Eto, Kohki Mizuno
  • Publication number: 20080230153
    Abstract: A method for producing a carburized part by carburizing a steel member under a vacuum in a decompression furnace while feeding carburizing gas comprises a step for forming an oxide film on at least a part of a surface of the steel member, a step for generating carbon by reducing the oxide film with the carburizing gas, and a step for carburizing the surface of the steel member under a vacuum by diffusing the carbon.
    Type: Application
    Filed: March 21, 2008
    Publication date: September 25, 2008
    Applicant: Honda Motor Co., Ltd.
    Inventors: Kazuo ISHII, Tatsumi TANAKA
  • Publication number: 20080216922
    Abstract: There are provided a method, between a diffusion process and a quenching process, a normalizing process of performing step cooling in which a temperature lowering treatment and a temperature keeping treatment are alternately repeated plural times so that a temperature history from the first temperature to a predetermined temperature satisfies a predetermined condition; an after-normalizing maintaining process of maintaining the temperature of the whole workpiece for a predetermined time after the normalizing process so that the whole workpiece becomes the predetermined temperature, thereby producing fine crystal grains in the workpiece; and a reheating process of raising the temperature of the workpiece to the second temperature, after the after-normalizing keeping process.
    Type: Application
    Filed: March 6, 2008
    Publication date: September 11, 2008
    Inventor: Kazuhiko Katsumata
  • Publication number: 20080156399
    Abstract: A super carburized, low-distortion quenched member with higher performance and minimized heat-treatment distortion is provided. A process for the production thereof includes a primary treatment and a secondary treatment. The primary treatment includes heating a steel member for a machine structure to a temperature within an austenite region by vacuum carburizing (low-pressure carburizing) to have carbon dissolved at least at a eutectoid carbon concentration of a surface layer portion of the member and then quenching the member to have at least one of ultrafine carbide and nuclei of the carbide formed in the surface layer portion of the member. The secondary treatment includes subsequently heating and soaking the member to a temperature within the austenite region and then conducting rapid quenching to have ultrafine carbide precipitated in an outermost surface layer portion.
    Type: Application
    Filed: February 8, 2006
    Publication date: July 3, 2008
    Inventors: Isao Machida, Hisashi Abe, Toshio Fukushima, Koji Horikiri
  • Publication number: 20080149227
    Abstract: A method of oxygen-free heat treatment of a steel part in an atmospheric pressure furnace is disclosed. The present method employs an oxygen-free controlled gas atmosphere including hydrogen gas in concentrations between about 1.0 percent to 10.0 percent, a hydrocarbon gas, such as propylene, in concentrations of between about 0.1 percent and 10.0 percent that varies as a function of time, with the balance of the gas atmosphere being nitrogen. The presently disclosed oxygen-free heat treatment process, preferably a carburization process, uses a precisely controlled atmosphere to minimize inter-granular oxidation, eliminate the formation of soot and cementite or other metallic carbides, and avoid hydrogen embrittlement.
    Type: Application
    Filed: December 26, 2006
    Publication date: June 26, 2008
    Inventors: Karen Anne Connery, Robert Marcel De Wilde, Richard A. Novak, Simon Ho, Amitabh Gupta
  • Patent number: 7357843
    Abstract: The present invention provides a vacuum heat treating method, such as carburization, carbonitridation, high temperature carburization, high concentration carburization and the like, performed while supplying a mixed gas of ethylene gas and hydrogen gas under reduced pressures. The method includes: detecting a quantity of ethylene gas and that of hydrogen gas in a vacuum heat treating furnace (1); calculating an equivalent carbon concentration of atmosphere on the basis of the detected quantity of ethylene gas and that of hydrogen gas; and comparing the calculated value with a targeted value which is set on the basis of a material specification and required heat treatment performance of an object to be treated (a workpiece), to control quantities of ethylene gas and hydrogen gas supplied into the vacuum heat treating furnace (1) on the basis of a difference between the calculated value and the targeted value. A heat treatment quality required for the workpiece can be obtained with accuracy and reproducibility.
    Type: Grant
    Filed: November 30, 2001
    Date of Patent: April 15, 2008
    Assignee: Koyo Thermo Systems Co., Ltd.
    Inventors: Kazuyoshi Yamaguchi, Yasunori Tanaka
  • Publication number: 20080073001
    Abstract: A vacuum carburization processing method includes a preparatory heating step of increasing the temperature of a workpiece in a heating chamber to a first temperature, a carburizing step of carburizing the workpiece by supplying carburizing gas into the heating chamber from a state where the pressure inside the heating chamber is reduced to an extremely low pressure, a diffusing step of terminating the supply of the carburizing gas and making carbon diffuse from a surface of the workpiece into its internal part, and a quenching step of abruptly cooling the temperature of the workpiece from a state where the temperature of the workpiece is at a second temperature; and also includes, between the diffusing step and the quenching step, a normalizing step of reducing the temperature of the workpiece so that the temperature history of the workpiece from the first temperature to a predetermined temperature satisfies predetermined conditions, a post-normalization maintaining step, performed after the normalizing step,
    Type: Application
    Filed: September 25, 2007
    Publication date: March 27, 2008
    Inventor: Kazuhiko KATSUMATA