EP0882811B1 - Procédé de cémentation de pièces métalliques dans un four sous vide - Google Patents

Procédé de cémentation de pièces métalliques dans un four sous vide Download PDF

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Publication number
EP0882811B1
EP0882811B1 EP97108860A EP97108860A EP0882811B1 EP 0882811 B1 EP0882811 B1 EP 0882811B1 EP 97108860 A EP97108860 A EP 97108860A EP 97108860 A EP97108860 A EP 97108860A EP 0882811 B1 EP0882811 B1 EP 0882811B1
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EP
European Patent Office
Prior art keywords
carbon
carbon carrier
carburizing
carrier
furnace
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97108860A
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German (de)
English (en)
Other versions
EP0882811B2 (fr
EP0882811A1 (fr
Inventor
Bernd Dr. Edenhofer
Hansjakob Drissen
Winfried Gräfen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ipsen International GmbH
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Ipsen International GmbH
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Publication date
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Application filed by Ipsen International GmbH filed Critical Ipsen International GmbH
Priority to EP97108860A priority Critical patent/EP0882811B2/fr
Priority to ES97108860T priority patent/ES2161398T5/es
Priority to DE59704123T priority patent/DE59704123D1/de
Priority to AT97108860T priority patent/ATE203572T1/de
Publication of EP0882811A1 publication Critical patent/EP0882811A1/fr
Application granted granted Critical
Publication of EP0882811B1 publication Critical patent/EP0882811B1/fr
Publication of EP0882811B2 publication Critical patent/EP0882811B2/fr
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/36—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases using ionised gases, e.g. ionitriding
    • C23C8/38—Treatment of ferrous surfaces
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/20—Carburising
    • C23C8/22—Carburising of ferrous surfaces

Definitions

  • the invention relates to a method for carburizing metallic workpieces in a vacuum furnace, the furnace atmosphere being a carbon carrier contains, under the process conditions of carburization with the release of pure carbon is split.
  • thermochemical case hardening treatments metallic workpieces have been in addition to the conventional gas carburizing is increasingly the carburizing processes in Vacuum systems enforced, because only with these procedures Carburization free of edge oxidation is feasible.
  • these Carburizing processes in vacuum systems are the vacuum and plasma carburizing. Since in these carburizing processes without oxygen-containing reaction gases is working, no C level control respectively; the key parameter for the carbon transition is at this method the carbon mass flow density, which as The amount of carbon is defined per unit of time and area in the Material passes over.
  • This carbon required for carburization is from a carbon carrier in the furnace atmosphere - usually one Hydrocarbon - provided at the given Process conditions with the release of pure carbon is split.
  • Vacuum carburizing processes are, for example, from the elements SU-A-668978, WO-A-96/3056 and GB-A-226127.
  • propane C 3 H 8
  • propane pyrolysis the carbon carrier, which is split in the course of the so-called propane pyrolysis according to the following reaction equations: C 3 H 8 ⁇ CH 4 + C 2 H 4 C 2 H 4 ⁇ 2C + 2H 2 CH 4 ⁇ C + 2H 2
  • methane (CH 4 ) is mostly used as the carbon carrier, which is obtained by methane pyrolysis according to the equation CH 4 ⁇ C + 2H 2 is split.
  • propane instead of methane.
  • methane or propane as a carbon carrier is in each case associated with various advantages and disadvantages.
  • propane due to its larger number of carbon atoms - 3 carbon atoms for propane versus 1 carbon atom for methane - a more effective carbon carrier as methane.
  • propane has the disadvantage that it is already thermally split in the temperature range above 600 ° C, which leads to Sooting of the oven and tar formation in the oven can result.
  • methane only has one carbon atom, but it is the methane molecule so stable that it is not already necessary Carburizing temperature is split. Rather, the split takes place only in Plasma and therefore really only on the workpiece surface. Since the Carbon mass flow density is low when splitting methane, For large batches, large quantities of process gas must be sent to the furnace be fed.
  • Partial pressure of the carbon carrier pulsates towards higher partial pressures vary so that the increasing the carbon mass flow density Partial pressure of the carbon carrier only briefly to increase the Carburizing effect is available, but then decreases again, so that the soot formation can be kept within limits. Because of the partial high partial pressure of the carbon carrier of up to 100 mbar however, even in this method operated with pressure pulses gradual sooting of the furnace so that it still closes Cleaning purposes must be switched off.
  • the invention has for its object to provide a method for carburizing metallic workpieces in a vacuum furnace, which ensures a constant carburization with a high carbon mass flow density, without the risk of sooting the furnace .
  • the carbon carrier is a hydrocarbon with a carbon-hydrogen ratio of 1: 1 is used, preferably acetylene, under the conditions stated in claim 1.
  • a partial pressure of the carbon carrier of less than 20 mbar, preferably 10 mbar, observed in order to achieve a high without soot formation Carbon mass flow density or carbon transfer rate achieve.
  • Carburizing the partial pressure of the carbon carrier pulsating can be varied, the partial pressure of the carbon carrier values from to reached to 50 mbar.
  • the furnace atmosphere can also contain other gases, in particular Contain hydrogen and / or argon, which additionally as the inert gases Prevent oxidation of the workpieces.
  • the Splitting of the carbon carrier can be supported by a plasma.
  • Vacuum carburization with the carbon carriers propane and ethane took place at 860 ° C and with a partial pressure of the carbon carrier of 10 mbar.
  • the vacuum carburization with the carbon carrier acetylene was carried out at 930 ° C and a partial pressure of the carbon carrier of 10 mbar a carburizing and diffusion phase period of 260 min.
  • the above-described uniform carburization on the outer and The inner surface of the test workpiece is also shown in the illustrations 2 to 4, in which the surface hardness and the case hardening depth (HV 1.0) is shown at different measuring points.
  • a comparison of the graphics 3 and 4 shows that when using acetylene as a carbon carrier not just an almost constant surface hardness along the inner and outer workpiece surface is achieved, but also the Case hardening depth (HV 1.0) on the inner and outer Workpiece surface coincides almost at all measuring points.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Furnace Details (AREA)

Claims (4)

  1. Procédé destiné à la carburation de pièces métalliques dans un four sous vide avec une atmosphère de four contenant une matière à base de carbone, les conditions du processus dans l'atmosphère du four étant réglées de telle sorte que la matière à base de carbone soit décomposée sous dépression en libérant du carbone pur,
       caractérisé en ce que le rapport carbone-hydrogène de la matière à base de carbone est de 1 / 1, et en ce que la pression partielle de la matière à base de carbone est variée par impulsions, la pression partielle de la matière à base de carbone étant portée jusqu'à 50 mbars lors d'impulsions de pression, et sinon est maintenue au-dessous de 20 mbars.
  2. Procédé selon la revendication 1, caractérisé par de l'acétylène en tant que matière à base de carbone.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que, outre la matière à base de carbone, l'atmosphère du four contient en outre encore de l'hydrogène et/ou de l'argon.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que la matière à base de carbone est décomposée à l'aide d'un plasma.
EP97108860A 1997-06-03 1997-06-03 Procédé de cémentation de pièces métalliques dans un four sous vide Expired - Lifetime EP0882811B2 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP97108860A EP0882811B2 (fr) 1997-06-03 1997-06-03 Procédé de cémentation de pièces métalliques dans un four sous vide
ES97108860T ES2161398T5 (es) 1997-06-03 1997-06-03 Procedimiento para la carburación de piezas metálicas en un horno de vacío.
DE59704123T DE59704123D1 (de) 1997-06-03 1997-06-03 Verfahren zur Aufkohlung metallischer Werkstücke in einem Vakuum-Ofen
AT97108860T ATE203572T1 (de) 1997-06-03 1997-06-03 Verfahren zur aufkohlung metallischer werkstücke in einem vakuum-ofen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97108860A EP0882811B2 (fr) 1997-06-03 1997-06-03 Procédé de cémentation de pièces métalliques dans un four sous vide

Publications (3)

Publication Number Publication Date
EP0882811A1 EP0882811A1 (fr) 1998-12-09
EP0882811B1 true EP0882811B1 (fr) 2001-07-25
EP0882811B2 EP0882811B2 (fr) 2010-12-15

Family

ID=8226864

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97108860A Expired - Lifetime EP0882811B2 (fr) 1997-06-03 1997-06-03 Procédé de cémentation de pièces métalliques dans un four sous vide

Country Status (4)

Country Link
EP (1) EP0882811B2 (fr)
AT (1) ATE203572T1 (fr)
DE (1) DE59704123D1 (fr)
ES (1) ES2161398T5 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10322563B3 (de) * 2003-05-20 2004-11-11 Ipsen International Gmbh Vakuumaufkohlungsverfahren
US7513958B2 (en) 2002-10-21 2009-04-07 Seco / Warwick S.A. Hydrocarbon gas mixture for the under-pressure carburizing of steel
DE102009041927A1 (de) 2009-09-17 2011-04-07 Hanomag Härtecenter GmbH Verfahren zur Niederdruckaufkohlung metallischer Werkstücke
DE10209382B4 (de) * 2002-03-02 2011-04-07 Robert Bosch Gmbh Verfahren zur Aufkohlung von Bauteilen
EP2886668A1 (fr) 2013-12-19 2015-06-24 Groz-Beckert KG Outil textile et son procédé de fabrication
EP3447163A1 (fr) 2017-08-21 2019-02-27 Seco/Warwick S.A. Procédé de cémentation à basse pression (lpc) de pièces en alliages de fer et d'autres métaux

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE203063T1 (de) † 1995-03-29 2001-07-15 Jh Corp Verfahren und zur vakuumaufkohlung, verwendung einer vorrichtung zur vakuumaufkohlung und aufgekohlte stahlerzeugnisse
JP3531736B2 (ja) 2001-01-19 2004-05-31 オリエンタルエンヂニアリング株式会社 浸炭方法及び浸炭装置
FR2821362B1 (fr) 2001-02-23 2003-06-13 Etudes Const Mecaniques Procede de cementation basse pression
DE10221605A1 (de) * 2002-05-15 2003-12-04 Linde Ag Verfahren und Vorrichtung zur Wärmebehandlung metallischer Werkstücke
DE10235131A1 (de) 2002-08-01 2004-02-19 Ipsen International Gmbh Verfahren und Vorrichtung zum Schwärzen von Bauteilen
DE10254846B4 (de) * 2002-11-25 2011-06-16 Robert Bosch Gmbh Verfahren zum Einsatzhärten von Bauteilen aus Warmarbeitsstählen mittels Unterdruckaufkohlung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3796615A (en) † 1971-06-23 1974-03-12 Hayes Inc C I Method of vacuum carburizing
SU668978A1 (ru) * 1977-06-02 1979-06-28 Предприятие П/Я А-7697 Способ цементации стальных деталей
GB2261227B (en) * 1991-11-08 1995-01-11 Univ Hull Surface treatment of metals
ATE203063T1 (de) * 1995-03-29 2001-07-15 Jh Corp Verfahren und zur vakuumaufkohlung, verwendung einer vorrichtung zur vakuumaufkohlung und aufgekohlte stahlerzeugnisse

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10209382B4 (de) * 2002-03-02 2011-04-07 Robert Bosch Gmbh Verfahren zur Aufkohlung von Bauteilen
US7513958B2 (en) 2002-10-21 2009-04-07 Seco / Warwick S.A. Hydrocarbon gas mixture for the under-pressure carburizing of steel
DE10322563B3 (de) * 2003-05-20 2004-11-11 Ipsen International Gmbh Vakuumaufkohlungsverfahren
DE102009041927A1 (de) 2009-09-17 2011-04-07 Hanomag Härtecenter GmbH Verfahren zur Niederdruckaufkohlung metallischer Werkstücke
DE102009041927B4 (de) * 2009-09-17 2015-08-06 Hanomag Härtecenter GmbH Verfahren zur Niederdruckaufkohlung metallischer Werkstücke
EP2886668A1 (fr) 2013-12-19 2015-06-24 Groz-Beckert KG Outil textile et son procédé de fabrication
WO2015091103A1 (fr) 2013-12-19 2015-06-25 Groz-Beckert Kg Outil textile et procédé de fabrication dudit outil textile
EP3447163A1 (fr) 2017-08-21 2019-02-27 Seco/Warwick S.A. Procédé de cémentation à basse pression (lpc) de pièces en alliages de fer et d'autres métaux
US10752984B2 (en) 2017-08-21 2020-08-25 Seco/Warwick S.A. Method of low pressure carburizing (LPC) of workpieces made of iron alloys and of other metals

Also Published As

Publication number Publication date
EP0882811B2 (fr) 2010-12-15
EP0882811A1 (fr) 1998-12-09
ES2161398T3 (es) 2001-12-01
ATE203572T1 (de) 2001-08-15
DE59704123D1 (de) 2001-08-30
ES2161398T5 (es) 2011-04-05

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