EP0779376B2 - Carburation par plasma de pièces métalliques - Google Patents

Carburation par plasma de pièces métalliques Download PDF

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Publication number
EP0779376B2
EP0779376B2 EP96118592A EP96118592A EP0779376B2 EP 0779376 B2 EP0779376 B2 EP 0779376B2 EP 96118592 A EP96118592 A EP 96118592A EP 96118592 A EP96118592 A EP 96118592A EP 0779376 B2 EP0779376 B2 EP 0779376B2
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EP
European Patent Office
Prior art keywords
propane
methane
carbon
plasma
carburizing
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
EP96118592A
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German (de)
English (en)
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EP0779376B1 (fr
EP0779376A1 (fr
Inventor
Winfried Dipl.-Phys. Gräfen
Bernd Dr. Mont. Edenhofer
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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Classifications

    • 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

Definitions

  • the invention relates to a method for plasma carburizing metallic workpieces in an oven, the furnace atmosphere being a carbon carrier contains the under the process conditions of plasma carburizing split with the release of pure carbon becomes.
  • thermochemical treatment processes for case hardening of metallic workpieces have in recent years alongside conventional Gas carburizing is increasingly the carburizing process enforced in vacuum systems, since only with these Process a carburization free of edge oxidation can be realized is.
  • these carburizing processes in vacuum systems it concerns the low pressure and the Plasma carburization. Because with these carburizing processes worked without oxygen-containing reaction gases no C level control can take place; the crucial one The parameter for the carbon transition is in these processes the carbon mass flow density, which is defined as the amount of carbon per time and Area unit passes into the material.
  • This Carbon required for carburization is extracted from an in carbon carrier in the furnace atmosphere - usually a hydrocarbon - provided the given under the given process conditions is split by pure carbon.
  • 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 usually 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 Carbon carrier is each with different fore and aft Disadvantages connected.
  • propane because of its larger number of carbon atoms - 3 carbon atoms in propane versus 1 carbon atom for methane - a more effective carbon carrier than Methane.
  • propane has the disadvantage on that propane is already in the temperature range above 600 ° C is thermally split, which already in A carburization takes place to soot the Oven leads.
  • methane only has one carbon atom but the methane molecule is so stable that it is not already at the necessary carburizing temperature is split. Rather, the split takes place only in the plasma and therefore really only on the workpiece surface. Because the carbon mass flow density at the splitting of methane is very low large-scale batches are very difficult to spread evenly Carburize methane.
  • methane, or propane Mixtures of methane and nitrogen as well as propane and nitrogen as a carbon carrier is, for example from the DE publication "Härterei-Technische Mitteilungen", Volume 49, No. 2, March / April 1994, page 105.
  • the object of the invention is to provide a process for the plasma carburization of metallic workpieces which ensures carburization with a high carbon mass flow density without there being a risk of sooting the furnace at the same time.
  • this task according to the invention resolved that dei furnace atmosphere a mixture of methane and propane that serves as a carbon carrier, being the methane-propane mixture Contains 5% by volume - 60% by volume, and that the gas pressure of the furnace atmosphere is below 10 mbar.
  • the method according to the invention draws is characterized in that the increase in carbon mass flow density while avoiding Soot formation is achieved by using only methane and propane existing gas mixture with a Propane. Share from 5 vol.% To 60 vol.% With a gas pressure used in the furnace atmosphere below 10 mbar becomes. At a gas pressure of less than 10 mbar is one thermal fission of methane almost impossible. The addition of other gases such as Hydrogen, to which methane-propane mixture is used Avoiding the formation of soot under the invention Process parameters are not necessary.
  • the drawing shows 27 CrMo for the material 4 the hardness curve after the plasma carburizing process with a methane-propane mixture as a carbon carrier shown.

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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)
  • Arc Welding In General (AREA)

Claims (2)

  1. Procédé de carburation par plasma de pièces métalliques dans un four, l'atmosphère du four contenant un support de carbone qui, dans les conditions du processus de carburation par plasma, se décompose en cédant du carbone pur, caractérisé en ce que l'atmosphère du four est constituée d'un mélange de méthane et de propane qui sert de support de carbone, le mélange méthane-propane contenant 5 % en volume à 60 % en volume de propane, et en ce que la pression gazeuse de l'atmosphère du four est inférieure à 10 mbar.
  2. Procédé selon la revendication 1, caractérisé en ce que la proportion de propane dans le mélange méthane-propane est comprise entre 5 et 50 % en volume.
EP96118592A 1995-12-16 1996-11-20 Carburation par plasma de pièces métalliques Expired - Lifetime EP0779376B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19547131A DE19547131A1 (de) 1995-12-16 1995-12-16 Verfahren zur Plasmaaufkohlung metallischer Werkstücke
DE19547131 1995-12-16

Publications (3)

Publication Number Publication Date
EP0779376A1 EP0779376A1 (fr) 1997-06-18
EP0779376B1 EP0779376B1 (fr) 2000-01-26
EP0779376B2 true EP0779376B2 (fr) 2002-12-18

Family

ID=7780384

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96118592A Expired - Lifetime EP0779376B2 (fr) 1995-12-16 1996-11-20 Carburation par plasma de pièces métalliques

Country Status (4)

Country Link
US (1) US5851314A (fr)
EP (1) EP0779376B2 (fr)
AT (1) ATE189271T1 (fr)
DE (2) DE19547131A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19815233A1 (de) * 1998-04-04 1999-10-07 Ald Vacuum Techn Gmbh Verfahren zur Vakuumaufkohlung unter Behandlungsgas
US20050016831A1 (en) * 2003-07-24 2005-01-27 Paganessi Joseph E. Generation of acetylene for on-site use in carburization and other processes
DE102004053935B4 (de) * 2004-11-09 2015-04-09 Schaeffler Technologies AG & Co. KG Verfahren zur Wärmebehandlung eines Bauteils aus einem durchhärtenden warmfesten Stahl und Bauteil aus einem durchhärtenden warmfesten Stahl
DE102006040814A1 (de) * 2006-08-31 2008-03-06 Schaeffler Kg Verfahren zum Erzeugen einer hoch einsatzhärtbaren Wälzlagerkomponente
KR101622306B1 (ko) * 2009-10-29 2016-05-19 삼성전자주식회사 그라펜 시트, 이를 포함하는 그라펜 기재 및 그의 제조방법

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5366205A (en) † 1989-07-13 1994-11-22 Solo Fours Industriels Sa Carburization installation
DE4427902C1 (de) † 1994-08-06 1995-03-30 Leybold Durferrit Gmbh Verfahren zum Aufkohlen von Bauteilen aus kohlungsfähigen Werkstoffen mittels einer impulsförmig betriebenen Plasmaentladung

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58113371A (ja) * 1981-12-28 1983-07-06 Seiko Epson Corp プラズマ表面硬化法
US5383980A (en) * 1992-01-20 1995-01-24 Leybold Durferrit Gmbh Process for hardening workpieces in a pulsed plasma discharge

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5366205A (en) † 1989-07-13 1994-11-22 Solo Fours Industriels Sa Carburization installation
DE4427902C1 (de) † 1994-08-06 1995-03-30 Leybold Durferrit Gmbh Verfahren zum Aufkohlen von Bauteilen aus kohlungsfähigen Werkstoffen mittels einer impulsförmig betriebenen Plasmaentladung

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
HTM 49 (1994), SEITEN 58-63, H. ALTENA "NIEDERDRUCK- UND PLASMAAUFKOHLUNG AUFKOHLUNGSPROZESE IN VACUUMANLAGEN" †
MATERIALS TRANSACTIONS, JIM, Vol. 35, No. 5 (1994), Seiten 351-355; Masahiro OKUMIYA ET AL, "APPLICATION OF PROPANE GAS TO PLASMA CARBURIZING" †

Also Published As

Publication number Publication date
US5851314A (en) 1998-12-22
DE19547131A1 (de) 1997-06-19
ATE189271T1 (de) 2000-02-15
DE59604291D1 (de) 2000-03-02
EP0779376B1 (fr) 2000-01-26
EP0779376A1 (fr) 1997-06-18

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