EP0779376B1 - Carburation par plasma de pièces métalliques - Google Patents

Carburation par plasma de pièces métalliques Download PDF

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Publication number
EP0779376B1
EP0779376B1 EP96118592A EP96118592A EP0779376B1 EP 0779376 B1 EP0779376 B1 EP 0779376B1 EP 96118592 A EP96118592 A EP 96118592A EP 96118592 A EP96118592 A EP 96118592A EP 0779376 B1 EP0779376 B1 EP 0779376B1
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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)
Other versions
EP0779376A1 (fr
EP0779376B2 (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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Publication date
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Application filed by Ipsen International GmbH filed Critical Ipsen International GmbH
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Publication of EP0779376B1 publication Critical patent/EP0779376B1/fr
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Publication of EP0779376B2 publication Critical patent/EP0779376B2/fr
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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 a furnace, the furnace atmosphere containing a carbon carrier which under the process conditions of plasma carburizing with the release of pure Carbon is split.
  • thermochemical treatment processes for case hardening metallic Workpieces have become conventional in recent years
  • Gas carburizing is increasingly the carburizing process in vacuum plants enforced, because only with these processes a carburization free of edge oxidation is feasible.
  • These carburizing processes in vacuum plants are concerned low pressure and plasma carburizing. Because with these carburizing processes one can work without oxygen-containing reaction gases there is no C level control; the decisive parameter for the carbon transition in these processes, the carbon mass flow density is is defined as the amount of carbon per unit of time and area in the Material passes over.
  • This carbon required for the carburization is extracted from an in carbon carrier in the furnace atmosphere - usually one Hydrocarbon - provided under the given process conditions is split with the release of 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 a carbon carrier is in each case with various advantages and disadvantages.
  • propane due to its larger number of carbon atoms - 3 carbon atoms in the Propane versus 1 carbon atom in methane - a more effective carbon carrier as methane.
  • propane has the disadvantage that propane is already split thermally in the temperature range above 600 ° C, whereby A carburization already takes place in the furnace, which leads to the furnace becoming sooty.
  • methane only has one carbon atom, but it is the methane molecule so stable that it is not already at the necessary carburizing temperature is split. Rather, the splitting takes place only in the plasma and therefore really only on the workpiece surface. Since the carbon mass flow density at Cleavage of methane is very low, large batches can only be Carburize evenly with methane.
  • 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.
  • the furnace atmosphere consists of a mixture of methane and propane serving as carbon support, wherein the methane-propane mixture to .- contains about 60% by volume of propane, and that the gas pressure of the furnace atmosphere is below 10 mbar.
  • the inventive method is characterized in that the increase the carbon mass flow density while avoiding soot formation is achieved in that an existing only of methane and propane Gas mixture with a propane content of up to 60 vol.% At a gas pressure in the furnace atmosphere of less than 10 mbar is used. At a gas pressure of Thermal splitting of the methane is almost impossible below 10 mbar. The Adding further gases such as hydrogen to the methane-propane mixture is to avoid soot formation among the Process parameters according to the invention are not necessary.

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 jusqu'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 true EP0779376B1 (fr) 2000-01-26
EP0779376B2 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

Family Cites Families (4)

* 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
US5139584A (en) † 1989-07-13 1992-08-18 Solo Fours Industriels Sa Carburization process
US5383980A (en) * 1992-01-20 1995-01-24 Leybold Durferrit Gmbh Process for hardening workpieces in a pulsed plasma discharge
DE4427902C1 (de) * 1994-08-06 1995-03-30 Leybold Durferrit Gmbh Verfahren zum Aufkohlen von Bauteilen aus kohlungsfähigen Werkstoffen mittels einer impulsförmig betriebenen Plasmaentladung

Also Published As

Publication number Publication date
EP0779376A1 (fr) 1997-06-18
ATE189271T1 (de) 2000-02-15
EP0779376B2 (fr) 2002-12-18
DE59604291D1 (de) 2000-03-02
US5851314A (en) 1998-12-22
DE19547131A1 (de) 1997-06-19

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