EP0512254A2 - Procédé pour le traitement thermochimique uniforme de pièces en acier ayant des surfaces d'accès difficle - Google Patents

Procédé pour le traitement thermochimique uniforme de pièces en acier ayant des surfaces d'accès difficle Download PDF

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Publication number
EP0512254A2
EP0512254A2 EP92105758A EP92105758A EP0512254A2 EP 0512254 A2 EP0512254 A2 EP 0512254A2 EP 92105758 A EP92105758 A EP 92105758A EP 92105758 A EP92105758 A EP 92105758A EP 0512254 A2 EP0512254 A2 EP 0512254A2
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EP
European Patent Office
Prior art keywords
gas
treatment
reactive gas
uniform
reactive
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.)
Granted
Application number
EP92105758A
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German (de)
English (en)
Other versions
EP0512254A3 (en
EP0512254B1 (fr
EP0512254B2 (fr
Inventor
Friedrich Dr. Dipl.-Phys. Preisser
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.)
ALD Vacuum Technologies GmbH
Original Assignee
Degussa GmbH
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Publication date
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Application filed by Degussa GmbH filed Critical Degussa GmbH
Publication of EP0512254A2 publication Critical patent/EP0512254A2/fr
Publication of EP0512254A3 publication Critical patent/EP0512254A3/de
Publication of EP0512254B1 publication Critical patent/EP0512254B1/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
    • C23C8/08—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
    • 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
    • C23C8/24—Nitriding
    • C23C8/26—Nitriding of ferrous surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/166—Selection of particular materials

Definitions

  • the invention relates to a method for the uniform thermochemical treatment of hollow bodies and bores or components made of steel with surfaces which are difficult to access from the outside with reactive gases at temperatures above 450 ° C.
  • thermochemical treatment of metallic components for the production of wear and corrosion-resistant surface layers is widespread in machine and gear construction.
  • nitriding, nitrocarburizing, carbonitriding and carburizing for steels are used as thermochemical processes.
  • Preferred process media are reactive gas mixtures which release the diffusible or compound-forming substances onto the workpiece surface at the selected treatment temperatures.
  • the treatment results also depend on the shape of the components and the type of charging within the heat treatment system and the flow of reactive gas through the batch.
  • DE-OS 19 01 607 discloses a method for nitriding the inner surfaces of pipes in which the ratio of length to diameter is greater than 50.
  • the inner surfaces are brought into contact with an activator and active ammonia gas is passed through the tubes at 450 to 650 ° C., the direction of flow of the ammonia having to be changed at regular intervals.
  • thermochemical treatment of hollow bodies and bores or components made of steel with reactive gases at temperatures above 450 ° C. that are difficult to access from the outside which is easy to carry out and uniform treatment layers also on the supplies surfaces that are difficult to access outside.
  • This object is achieved in that the treatment takes place at pressures above 0.2 MPa.
  • Ammonia is preferably used as the reactive gas for nitriding, it having proven useful to add 5 to 95% by volume of molecular nitrogen to the ammonia.
  • a carbon-donating gas is used as the reactive gas, preferably methane or methane mixtures at 870 to 1000 ° C. It is also advantageous to carry out the treatment with the reactive gas under constant pressure.
  • ammonia hydrocarbons, such as methane
  • boron-releasing gases such as boron trifluoride
  • the pressures are generally between 0.2 and 10 MPa, the upper pressure limit depending on the furnace available.
  • An injection nozzle as shown in the illustration made of a material 16MnCr5 is nitrided in a pressure-resistant furnace in a gas mixture of 50% by volume ammonia and 50% by volume nitrogen at 0.5 MPa for 2 hours at 500 ° C.
  • the injection nozzles are placed as bulk goods in the batch room without any special arrangement or alignment. After the treatment has been completed, the thickness of the connection layer is measured on the outside of the nozzle and in the inner bore (for positions, see figure).
  • outlet bores of the nozzle at the tip of the nozzle are nitrided with an initial diameter of 0.2 mm and a length of 1.5 mm in the inner surfaces.
  • the layer thickness is equal to the layer thickness in the entire inner bore of the nozzle.
  • the same process can also be carried out as carburizing with methane as a reactive gas at a pressure of 0.8 MPa and a temperature of 930 ° C. This gives similar carburizing depths on the inside and outside as in nitriding.
  • the high concentration of reactive elements in the treatment gas enables the batch individual parts to be packed tightly. So far, certain, empirically determined distances between the individual parts have to be observed in order to treat the individual parts equally. These distances can be reduced at pressures> 0.2 MPa without affecting the uniformity of the layers.
  • ammonia / nitrogen mixtures with additions of carbon dioxide or carbon monoxide and optionally air are used as the reactive gas, the volume fraction of these additions being able to vary between a few and 50% by volume.
  • carburizing gases such as methane, endogases, nitrogen-methanol or natural gas-air mixtures, can be used for carburizing.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Heat Treatment Of Articles (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Treatment Of Sludge (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Fire-Extinguishing Compositions (AREA)
EP92105758A 1991-05-08 1992-04-03 Procédé pour le traitement thermochimique uniforme de pièces en acier ayant des surfaces d'accès difficle Expired - Lifetime EP0512254B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4115135 1991-05-08
DE4115135A DE4115135C1 (fr) 1991-05-08 1991-05-08

Publications (4)

Publication Number Publication Date
EP0512254A2 true EP0512254A2 (fr) 1992-11-11
EP0512254A3 EP0512254A3 (en) 1993-03-24
EP0512254B1 EP0512254B1 (fr) 1996-06-19
EP0512254B2 EP0512254B2 (fr) 2000-01-19

Family

ID=6431301

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92105758A Expired - Lifetime EP0512254B2 (fr) 1991-05-08 1992-04-03 Procédé pour le traitement thermochimique uniforme de pièces en acier ayant des surfaces d'accès difficle

Country Status (10)

Country Link
EP (1) EP0512254B2 (fr)
JP (1) JP3258071B2 (fr)
AT (1) ATE139579T1 (fr)
CZ (1) CZ288263B6 (fr)
DE (2) DE4115135C1 (fr)
ES (1) ES2088515T5 (fr)
HU (1) HU209457B (fr)
PL (1) PL291528A1 (fr)
RU (1) RU2052535C1 (fr)
TW (1) TW223128B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5637158A (en) * 1994-12-17 1997-06-10 Fischerwerke Artur Fischer Gmbh & Co. Kg Method for the manufacture of an expansible anchor consisting of corrosion-resistant steel
WO2003016708A1 (fr) * 2001-08-11 2003-02-27 Robert Bosch Gmbh Soupape d'injection de carburant pour moteurs a combustion interne et procede de trempe de ladite soupape

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10062862C2 (de) * 2000-12-16 2003-03-27 Ald Vacuum Techn Ag Vorrichtung zur gleichmässigen thermochemischen Behandlung von metallischen Werkstücken mit einem Reaktivgas
DE10109565B4 (de) 2001-02-28 2005-10-20 Vacuheat Gmbh Verfahren und Vorrichtung zur partiellen thermochemischen Vakuumbehandlung von metallischen Werkstücken
DE102004058838B4 (de) * 2004-12-06 2007-11-29 Schramm, Armin Düseneinsatz aus Stahl
DE102005061781A1 (de) * 2005-12-23 2007-06-28 Schaeffler Kg Injektor eines Kraftstoff-Einspritzsystems
DE102013006589A1 (de) * 2013-04-17 2014-10-23 Ald Vacuum Technologies Gmbh Verfahren und Vorrichtung für das thermochemische Härten von Werkstücken
RU2651841C2 (ru) * 2015-12-23 2018-04-24 Олег Владимирович Ольшанский Способ обработки металлических деталей в условиях акустического резонансного воздействия потоком смеси сжатого воздуха и газообразных химических реагентов и устройство для его осуществления

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB749992A (en) * 1951-09-21 1956-06-06 United States Steel Corp Methods for nitriding metallic surfaces
US2779697A (en) * 1955-09-26 1957-01-29 United States Steel Corp Method of nitriding metallic surfaces
GB1309257A (en) * 1970-02-18 1973-03-07 Millingford Eng Co Ltd Method of nitriding hollow bodies
JPS52145343A (en) * 1976-05-29 1977-12-03 Kiyoichi Ogawa Pressurized nitriding
DE2851983A1 (de) * 1978-12-01 1980-06-04 Degussa Verfahren zum aufkohlen von hohlkoerpern, insbesondere von duesen
EP0485686A1 (fr) * 1990-11-15 1992-05-20 Degussa Aktiengesellschaft Procédé de nitruration sous pression d'articles en acier

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB114446A (en) * 1917-01-27 1918-03-27 British Carbonizing Company Lt Improvements in or relating to the Carburization and Case-hardening of Iron and Steel Articles.
US4160680A (en) * 1976-11-05 1979-07-10 Sola Basic Industries, Inc. Vacuum carburizing

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB749992A (en) * 1951-09-21 1956-06-06 United States Steel Corp Methods for nitriding metallic surfaces
US2779697A (en) * 1955-09-26 1957-01-29 United States Steel Corp Method of nitriding metallic surfaces
GB1309257A (en) * 1970-02-18 1973-03-07 Millingford Eng Co Ltd Method of nitriding hollow bodies
JPS52145343A (en) * 1976-05-29 1977-12-03 Kiyoichi Ogawa Pressurized nitriding
DE2851983A1 (de) * 1978-12-01 1980-06-04 Degussa Verfahren zum aufkohlen von hohlkoerpern, insbesondere von duesen
EP0485686A1 (fr) * 1990-11-15 1992-05-20 Degussa Aktiengesellschaft Procédé de nitruration sous pression d'articles en acier

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, unexamined applications, Field C, Band 5, Nr. 124, 11. August 1981 THE PATENT OFFICE JAPANESE GOVERNMENT Seite 6 C 66 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5637158A (en) * 1994-12-17 1997-06-10 Fischerwerke Artur Fischer Gmbh & Co. Kg Method for the manufacture of an expansible anchor consisting of corrosion-resistant steel
WO2003016708A1 (fr) * 2001-08-11 2003-02-27 Robert Bosch Gmbh Soupape d'injection de carburant pour moteurs a combustion interne et procede de trempe de ladite soupape
US7419553B2 (en) 2001-08-11 2008-09-02 Robert Bosch Gmbh Fuel injection valve for internal combustion engines and a method for hardening the said valve

Also Published As

Publication number Publication date
EP0512254A3 (en) 1993-03-24
DE4115135C1 (fr) 1992-02-27
RU2052535C1 (ru) 1996-01-20
JP3258071B2 (ja) 2002-02-18
HUT61056A (en) 1992-11-30
EP0512254B1 (fr) 1996-06-19
PL291528A1 (en) 1992-11-16
CZ288263B6 (en) 2001-05-16
ES2088515T3 (es) 1996-08-16
TW223128B (fr) 1994-05-01
ES2088515T5 (es) 2000-05-01
DE59206595D1 (de) 1996-07-25
ATE139579T1 (de) 1996-07-15
EP0512254B2 (fr) 2000-01-19
HU209457B (en) 1994-06-28
HU913870D0 (en) 1992-02-28
CS137592A3 (en) 1992-12-16
JPH05132753A (ja) 1993-05-28

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