EP1521855A1 - Procede et dispositif de carburation sous depression - Google Patents

Procede et dispositif de carburation sous depression

Info

Publication number
EP1521855A1
EP1521855A1 EP03763709A EP03763709A EP1521855A1 EP 1521855 A1 EP1521855 A1 EP 1521855A1 EP 03763709 A EP03763709 A EP 03763709A EP 03763709 A EP03763709 A EP 03763709A EP 1521855 A1 EP1521855 A1 EP 1521855A1
Authority
EP
European Patent Office
Prior art keywords
opacity
treatment
treatment room
gas
hydrocarbon
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.)
Ceased
Application number
EP03763709A
Other languages
German (de)
English (en)
Inventor
Alexander Jurmann
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.)
Linde GmbH
Original Assignee
Linde GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Linde GmbH filed Critical Linde GmbH
Publication of EP1521855A1 publication Critical patent/EP1521855A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments

Definitions

  • the invention relates to a method for carburizing at subatmospheric pressures, a treatment chamber containing a hydrocarbon-containing treatment gas and an exhaust gas stream emerging from the treatment room.
  • the invention further relates to a device for carburizing at subatmospheric pressures, comprising at least one treatment room, at least one feed line via which a hydrocarbon-containing treatment gas is fed to the treatment room, and at least one pump-off line via which the exhaust gas stream is withdrawn from the treatment room by means of a pumping device ,
  • a disadvantage of the methods belonging to the prior art is furthermore that the calculation of the transferred carbon always starts from the theoretical composition of the hydrocarbon-containing treatment gas used. This means, for example, that the composition C 3 H 8 is used when propane is used as the hydrocarbon-containing treatment gas. When using technical propane, however, only the calorific value is guaranteed, but not the exact composition. The sum of carbon in technical propane is therefore not identical to the theoretical C content of pure propane, which is taken into account when calculating the amount of carbon transferred. This also results in errors in the calculation result.
  • the object of the present invention is to provide a generic method and a generic device for carburizing at subatmospheric pressures, which avoids the aforementioned disadvantages.
  • this object is achieved in that the opacity of the gas atmosphere prevailing in the treatment room and / or the opacity of the exhaust gas stream emerging from the treatment room is determined and the supply of the hydrocarbon-containing treatment gas to the treatment room is regulated as a function of the determined opacity.
  • the object is achieved in that at least one valve is arranged in the supply line, at least one device for determining the opacity of the gas atmosphere prevailing in the treatment room is arranged in the treatment room and / or at least one opacity probe is arranged in the pumping line and an evaluation unit is provided, which regulates the supply of the hydrocarbon-containing treatment gas into the treatment room by actuating the valve as a function of the opacity of the exhaust gas stream determined by means of the device for determining the opacity of the gas atmosphere prevailing in the treatment room and / or the opacity probe.
  • the method according to the invention, the device according to the invention and further refinements of the same or the same are explained in more detail below with reference to the exemplary embodiment shown in the figure.
  • the figure shows a treatment chamber 3, shown only schematically, to which the hydrocarbon-containing treatment gas is fed via a feed line 1.
  • the following are preferably used as hydrocarbon-containing treatment gases: alkanes, alkenes, alkynes, derivatives of the aforementioned, possibly in combination with hydrogen.
  • the desired subatmospheric pressure in the treatment room 3 is set via the pump line 4, in which a vacuum pump 6 is arranged.
  • work is preferably carried out at pressures up to 20 mbar, preferably at pressures between 3 and 20 mbar.
  • a valve in particular a control valve 2 is now arranged in the feed line 1.
  • the pump-off line 4 has an opacity probe 5.
  • Both the control valve 2 and the opacity probe 5 are connected to an evaluation unit 9 via data lines 7 and 8, respectively.
  • the evaluation unit (9) enables - according to an advantageous embodiment of the device according to the invention - the setting of an opacity limit value.
  • the opacity of the exhaust gas stream emerging from the treatment room 3 via the pump line 4 is now determined and measured and, depending on the opacity determined, the supply of the hydrocarbon-containing treatment gas via the feed line 1 into the treatment room 3 is regulated.
  • Exhaust gas flow either completely interrupted the supply of the hydrocarbon-containing treatment gas via the feed line 1 into the treatment room 3 or the amount of the hydrocarbon-containing treatment gas supplied to the treatment room 3
  • Treatment gas are at least reduced. If the adjusted or adjustable opacity value is undershot again, the supply of the hydrocarbon-containing treatment gas into the treatment chamber 3 can be resumed or the amount of the hydrocarbon-containing treatment gas supplied can be increased again become.
  • the invention thus enables continuous control of the hydrocarbon-containing treatment gas supplied to the treatment room 3.
  • a device 10 for determining the opacity of the gas atmosphere prevailing in the treatment room 3 can be provided.
  • This device 10 for determining the opacity is likewise connected to the evaluation unit 9 via a data line 11.
  • the aforementioned device 10 for determining the opacity of the gas atmosphere prevailing in the treatment room 3 can also be designed as an observation nozzle.
  • the device 10 for determining the opacity of the gas atmosphere prevailing in the treatment room 3 enables a batch-related measurement of the gas atmosphere prevailing in the treatment room 3. Falsifying effects, which can occur, for example, when the exhaust gas stream drawn off from the treatment room 3 is cooled, are avoided in this method variant.
  • a disadvantage of this procedure, however, is that the elimination of aerosols, which takes place only when the exhaust gas stream is cooled, is not yet visible in the treatment room 3 itself and can therefore be determined.
  • the method according to the invention and the device according to the invention thus enable the hydrocarbon-containing treatment gas to be fed into the treatment room in a controlled manner, as a result of which uncontrolled decomposition of excess hydrocarbons in the treatment room and the pumping line and thus soot and tar formation can be effectively avoided.
  • a large part of the undesired deposits within the treatment room, on the material to be treated in the treatment room or in the pump-off line is reliably avoided by the method according to the invention or by the device according to the invention.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Chemical Vapour Deposition (AREA)

Abstract

L'invention concerne un procédé et un dispositif de carburation à des pressions sous-atmosphériques. Selon ledit procédé, un gaz de traitement contenant des hydrocarbures est conduit à une chambre de traitement et un courant d'effluent gazeux sort de ladite chambre de traitement. Selon l'invention, l'opacité de l'atmosphère gazeuse régnant dans la chambre de traitement (3) et/ou l'opacité du courant d'effluent gazeux (4) sortant de ladite chambre (3) sont déterminées, et l'amenée du gaz de traitement (1) contenant des hydrocarbures à la chambre de traitement (3) est régulée en fonction de l'opacité déterminée. Si une valeur d'opacité qui a été réglée ou peut être réglée est dépassée, l'amenée de gaz de traitement (1) contenant des hydrocarbures à la chambre de traitement (3) peut être interrompue, ou bien la quantité de gaz de traitement (1) contenant des hydrocarbures qui est amenée à ladite chambre (3) peut être réduite.
EP03763709A 2002-07-17 2003-07-04 Procede et dispositif de carburation sous depression Ceased EP1521855A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10232432A DE10232432A1 (de) 2002-07-17 2002-07-17 Verfahren und Vorrichtung zum Unterdruckaufkohlen
DE10232432 2002-07-17
PCT/EP2003/007194 WO2004007779A1 (fr) 2002-07-17 2003-07-04 Procede et dispositif de carburation sous depression

Publications (1)

Publication Number Publication Date
EP1521855A1 true EP1521855A1 (fr) 2005-04-13

Family

ID=29796417

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03763709A Ceased EP1521855A1 (fr) 2002-07-17 2003-07-04 Procede et dispositif de carburation sous depression

Country Status (5)

Country Link
US (1) US20060108719A1 (fr)
EP (1) EP1521855A1 (fr)
AU (1) AU2003246386A1 (fr)
DE (1) DE10232432A1 (fr)
WO (1) WO2004007779A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2462253B1 (fr) 2009-08-07 2021-04-07 Swagelok Company Carburation à basse température sous vide partiel
WO2013109415A1 (fr) 2012-01-20 2013-07-25 Swagelok Company Écoulement concourant de gaz d'activation pour carburation à basse température

Family Cites Families (9)

* 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
DE2636273C3 (de) * 1976-08-12 1980-02-07 Ipsen Industries International Gmbh, 4190 Kleve Verfahren zur Regelung eines Aufkohlens von Teilen in einem Vakuumofen
JPS5354136A (en) * 1976-10-28 1978-05-17 Ishikawajima Harima Heavy Ind Vacuum carburizing furnace
DE2851982A1 (de) * 1978-12-01 1980-06-12 Degussa Verfahren zum steuern von aufkohlungsprozessen im unterdruckbereich
DE3038078A1 (de) * 1980-10-08 1982-05-06 Linde Ag, 6200 Wiesbaden Verfahren und vorrichtung zum aufkohlen metallischer werkstuecke
US4432852A (en) * 1982-02-18 1984-02-21 Corning Glass Works Method and apparatus for producing mica film
DE3406792A1 (de) * 1984-02-24 1985-08-29 Linde Ag, 6200 Wiesbaden Verfahren und vorrichtung zum gluehen von metallteilen
DE3725174A1 (de) * 1987-07-29 1989-02-09 Linde Ag Verfahren zum blank- und rekristallisationsgluehen
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004007779A1 *

Also Published As

Publication number Publication date
DE10232432A1 (de) 2004-01-29
US20060108719A1 (en) 2006-05-25
AU2003246386A1 (en) 2004-02-02
WO2004007779A1 (fr) 2004-01-22

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