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DE4115135C1 - - Google Patents

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Publication number
DE4115135C1
DE4115135C1 DE4115135A DE4115135A DE4115135C1 DE 4115135 C1 DE4115135 C1 DE 4115135C1 DE 4115135 A DE4115135 A DE 4115135A DE 4115135 A DE4115135 A DE 4115135A DE 4115135 C1 DE4115135 C1 DE 4115135C1
Authority
DE
Germany
Prior art keywords
treatment
gas
mpa
ammonia
reactive gas
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
DE4115135A
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German (de)
Inventor
Friedrich Dipl.-Phys. Dr. 6467 Buedingen De 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
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6431301&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=DE4115135(C1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Degussa GmbH filed Critical Degussa GmbH
Priority to DE4115135A priority Critical patent/DE4115135C1/de
Priority to PL29152891A priority patent/PL291528A1/en
Priority to TW080106842A priority patent/TW223128B/zh
Priority to HU913870A priority patent/HU209457B/en
Application granted granted Critical
Publication of DE4115135C1 publication Critical patent/DE4115135C1/de
Priority to ES92105758T priority patent/ES2088515T5/en
Priority to DE59206595T priority patent/DE59206595D1/en
Priority to EP92105758A priority patent/EP0512254B2/en
Priority to AT92105758T priority patent/ATE139579T1/en
Priority to CS19921375A priority patent/CZ288263B6/en
Priority to JP11353092A priority patent/JP3258071B2/en
Priority to SU925011449A priority patent/RU2052535C1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C23C8/08—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

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  • 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)
  • Treatment Of Steel In Its Molten State (AREA)
  • Heat Treatment Of Articles (AREA)
  • Treatment Of Sludge (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Fire-Extinguishing Compositions (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)

Abstract

Hollow bodies or holes in steel components are subjected to thermomechanical treatments above 450 deg.C with reactive gases, partic. ammonia with 5-95 vol.% N or a C-generating gas, pref. methane at 870-1000 deg.C, at gas pressures above 0.2 MPa. Pref. the treatment is carried out at constant pressure, between 0.2 MPa and 10 MPa, depending on furnace capability.

Description

Die Erfindung betrifft ein Verfahren zur gleichmäßigen thermochemischen Behandlung von Hohlkörpern und Bohrungen oder von außen schwer zugänglichen Flächen aufweisenden Bauteilen aus Stahl mit Reaktivgasen bei Temperaturen oberhalb 450°C.The invention relates to a method for uniform thermochemical treatment of hollow bodies and Drilled holes or surfaces that are difficult to access from the outside having components made of steel with reactive gases Temperatures above 450 ° C.

Die thermochemische Behandlung von metallischen Bauteilen zur Herstellung von verschleiß- und korrosionsbeständigen Randschichten ist im Maschinen- und Getriebebau weit verbreitet. Als thermochemische Verfahren kommen beispielsweise Nitrieren, Nitrocarburieren, Carbonitrieren und Carburieren für Stähle zur Anwendung. Bevorzugte Prozeßmedien sind Reaktivgasgemische, die die diffusionsfähigen bzw. verbindungsbildenden Substanzen an die Werkstückoberfläche bei den gewählten Behandlungstemperaturen abgeben. Neben Temperaturen, Gaszusammensetzungen und Stahlarten sind die Behandlungsergebnisse auch von der Form der Bauteile und von der Art der Chargierung innerhalb der Wärmebehandlungsanlage und der Durchströmung der Charge mit Reaktivgas abhängig. The thermochemical treatment of metallic Components for the production of wear and tear corrosion-resistant surface layers are and gear construction widely used. As a thermochemical Processes come for example nitriding, Nitrocarburizing, carbonitriding and carburizing for Steels for use. Preferred process media are Reactive gas mixtures that the diffusible or compound-forming substances to the Workpiece surface at the selected Submit treatment temperatures. In addition to temperatures, Gas compositions and types of steel are the Treatment results also from the shape of the components and the type of batching within the Heat treatment plant and the flow of the Batch with reactive gas dependent.  

Trotz langjähriger Erfahrungen und zahlreicher Verfahrensmodifikationen ist es technisch und wirtschaftlich nur bedingt möglich, in Reaktivgasgemischen kompliziert geformte Bauteile an von außen schwer zugänglichen Innenflächen zu nitrieren oder aufzukohlen. Darunter werden z. B. Stahlteile mit Hinterschneidungen, Innenbohrungen oder Sacklöchern, beziehungsweise Rohre, Kugelkäfige oder Düsenkörper mit zu härtenden Innenflächen verstanden. Die mangelnde Gleichmäßigkeit zwischen Innen- und Außenflächen ist mit der mangelnden Verfügbarkeit des Reaktivgases innerhalb der Hohlkörper zu begründen. Das Reaktivgas füllt zwar den Hohlraum, jedoch verarmt dieses Prozeßgas an nitrier/kohlungsfähigem Material, da der Gasaustausch mit der Umgebung nicht erfolgt, weil innerhalb des Hohlkörpers die Strömungsgeschwindigkeit des Gases nahe Null ist. Üblicherweise wird mit Reaktivgasdrücken von 0,1 MPa absolut gearbeitet, das heißt unter Normaldruck.Despite many years of experience and numerous Process modifications it is technical and only economically possible in Reactive gas mixtures on complicated shaped components interior surfaces that are difficult to access from the outside nitride or carburize. Among them, e.g. B. Steel parts with undercuts, internal holes or Blind holes, or pipes, ball cages or Understood nozzle body with inner surfaces to be hardened. The lack of uniformity between inside and Outside space is associated with the lack of availability of the Justify reactive gas within the hollow body. The reactive gas fills the cavity, but is impoverished this process gas of nitriding / carbonizable material, since there is no gas exchange with the environment, because inside the hollow body Flow rate of the gas is close to zero. Usually with reactive gas pressures of 0.1 MPa worked absolutely, that means under normal pressure.

Auch ein periodischer Druckwechsel im Unterdruckbereich, wie er z. B. in der US-PS 41 60 680 beschrieben ist, verbessert die Nitrier- oder Kohlungsschichten an schwer zugänglichen Flächen nur unwesentlich.A periodic pressure change in the Vacuum area, as it is for. B. in US-PS 41 60 680 is described, improves the nitriding or Coal layers in hard-to-reach areas only insignificant.

In der DE-OS 19 01 607 wird ein Verfahren zum Nitrieren der Innenflächen von Rohren geoffenbart, bei denen das Verhältnis von Länge zu Durchmesserr größer als 50 ist. Dabei werden die Innenflächen mit einem Aktivator in Berührung gebracht und aktives Ammoniakgas bei 450 bis 650°C durch die Rohre geführt, wobei die Strömungsrichtung des Ammoniaks in regelmäßigen Abständen gewechselt werden muß. DE-OS 19 01 607 describes a method for Nitriding the inner surfaces of pipes revealed at which the ratio of length to diameter larger than 50. The inner surfaces are covered with a Activator contacted and active Ammonia gas at 450 to 650 ° C through the pipes led, the flow direction of the ammonia in must be changed at regular intervals.  

Auch hier erhält man keine gleichmäßige Nitrierschicht, da das Reaktivgas in der Rohrmitte an aktiven Bestandteilen verarmt. Außerdem ist dieses Verfahren nur bei Rohren anwendbar.Here, too, you don't get an even one Nitriding layer, since the reactive gas in the middle of the pipe active components are depleted. Besides, this is Procedure only applicable to pipes.

Weiterhin ist aus der DE-OS 28 51 983 ein Verfahren zum gleichmäßigen Aufkohlen von mit Bohrungen versehenen und unterschiedliche Wandstärken aufweisenden Hohlkörpern bekannt, bei dem Teile des Hohlkörpers abgedeckt bzw. einer geringeren Kohlungsaktivität ausgesetzt werden. Dieses Verfahren ist jedoch sehr zeitaufwendig und bedienungsunfreundlich.Furthermore, from DE-OS 28 51 983 a method for even carburizing with holes provided and different wall thicknesses having known hollow bodies, in which parts of the Hollow body covered or a lesser Be exposed to carbonation activity. This method however, is very time consuming and unfriendly.

Bekannt sind auch Verfahren (US-PS 27 79 697), bei denen Stähle in gasförmigem Ammoniak unter Druck in einem Druckgefäß nitriert werden. Diese Verfahren fanden jedoch keine Anwendung auf Bauteile aus Stahl, die mit von außen schwer zugänglichen Flächen oder Hohlräumen versehen sind.Processes (US Pat. No. 2,779,697) are also known which steels in gaseous ammonia under pressure in be nitrided in a pressure vessel. This procedure however, were not applied to steel components, those with surfaces difficult to access from the outside or Cavities are provided.

Es war daher Aufgabe der vorliegenden Erfindung, ein Verfahren zur gleichmäßigen thermochemischen Behandlung von Hohlkörpern und Bohrungen oder von außen schwer zugängliche Flächen aufweisenden Bauteilen aus Stahl mit Reaktivgasen bei Temperaturen oberhalb 450°C zu entwickeln, das einfach duchzuführen ist und gleichmäßige Behandlungsschichten auch an den von außen schwer zugänglichen Flächen liefert.It was therefore an object of the present invention Process for uniform thermochemical Treatment of hollow bodies and bores or of surfaces that are difficult to access from the outside Steel components with reactive gases at temperatures Developing above 450 ° C is easy is to be carried out and evenly Treatment layers also on the hard from the outside supplies accessible areas.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Behandlung bei Drücken oberhalb 0,2 MPa stattfindet. This object is achieved in that treatment at pressures above 0.2 MPa takes place.  

Vorzugsweise verwendet man zum Nitrieren als Reaktivgas Ammoniak, wobei es sich bewährt hat, dem Ammoniak 5 bis 95 Vol.% molekularen Stickstoff zuzumischen.Preferably used for nitriding as Reactive gas ammonia, where it has proven itself, the Ammonia 5 to 95 vol.% Molecular nitrogen to mix.

Zum Karburieren verwendet man als Reaktivgas ein kohlenstoffabgebendes Gas, vorzugsweise Methan oder Methangemische bei 870 bis 1000°C. Außerdem ist es vorteilhaft, die Behandlung mit dem Reaktivgas unter konstantem Druck durchzuführen.A carburizing is used as a reactive gas carbon donating gas, preferably methane or Methane mixtures at 870 to 1000 ° C. Besides, it is advantageous to take the treatment with the reactive gas constant pressure.

Es hat sich überraschenderweise gezeigt, daß bei einer Verdichtung des Reaktivgases während der Behandlungsphase auf Drücke größer als 0,2 MPa die genannten Schwierigkeiten nicht auftreten. Der höhere Druck des Reaktivgases innerhalb eines Hohlkörpers bewirkt eine schnelle und vollständige Ausbildung von Randschichten. Die im Reaktivgas gespeicherte Menge des reaktiven Stoffes ist ausreichend, die typischerweise erforderlichen Einhärtetiefen bzw. Verbindungsschichtdicken zu erzeugen. Eine Verarmung innerhalb des Hohlraumes an reaktiven Stoffen tritt zwar ein, jedoch nicht bis auf diejenige Konzentration, in der z. B. das Wachstum von Verbindungsschichten gestört ist. Die Konzentration des Reaktivgases ist innen und außen jeweils so hoch, daß die Abgabe von z. B. N, C oder B an das Behandlungsgut die insgesamt verfügbare Konzentration weniger vermindert als bei Behandlung unter Normaldruck oder Unterdruck. Je weiter der Behandlungsdruck oberhalbb 0,2 MPa liegt, desto geringer wird die prozentuale Änderung der Zusammensetzung des Prozeßgases durch Diffusion ins bzw. Reaktion mit dem Werkstück. Dadurch werden auch die bislang bekannten unerwünschten Unterschiede zwischen Innen- und Außenflächen von zu behandelnden Hohlkörpern eliminiert. It has surprisingly been found that in one Compression of the reactive gas during the Treatment phase at pressures greater than 0.2 MPa difficulties mentioned do not occur. The higher one Pressure of the reactive gas within a hollow body causes a quick and complete training of Boundary layers. The amount stored in the reactive gas of the reactive substance is sufficient typically required hardening depths or To produce connection layer thicknesses. An impoverishment reactive substances occur within the cavity one, but not except for one Concentration in which B. The growth of Link layers is disturbed. The concentration of the reactive gas is so high inside and outside that the delivery of z. B. N, C or B to that The total concentration available less diminished than with treatment under Normal pressure or negative pressure. The further the Treatment pressure is above 0.2 MPa, the the percentage change in Composition of the process gas by diffusion into or reaction with the workpiece. This will also the previously known undesirable differences between inner and outer surfaces of the items to be treated Hollow bodies eliminated.  

Dies bedeutet, daß Unterschiede zwischen Innen- und Außenflächen sehr klein werden. Zusätzliche Gaseindüsung oder Gasumwälzung im Innenraum ist daher nicht erforderlich.This means that there are differences between inside and Outside areas become very small. Additional Gas injection or gas circulation in the interior is therefore not mandatory.

Als Reaktivgase finden beispielsweise Ammoniak, Kohlenwasserstoffe, wie Methan, oder borabgebende Gase, wie Bortrifluorid Verwendung. Die Drücke bewegen sich im allgemeinen zwischen 0,2 und 10 MPa, wobei die obere Druckgrenze abhängig ist von dem zur Verfügung stehenden Ofen.For example, ammonia, Hydrocarbons such as methane or boron donors Gases, such as boron trifluoride use. Move the pressures generally between 0.2 and 10 MPa, the upper pressure limit depends on the available standing furnace.

Folgendes Beispiel soll die Vorteile des erfindungsgemäßen Verfahrens verdeutlichen:The following example is intended to show the advantages of The method according to the invention clarifies:

Eine Einspritzdüse gemäß Abbildung aus einem Werkstoff 16MnCr5 wird in einem durckfesten Ofen in einem Gasgemisch aus 50 Vol.% Ammoniak und 50 Vol.% Stickstoff bei 0,5 MPa während 2 Stunden bei 500°C nitriert. Die Einspritzdüsen sind dabei als Schüttgut im Chargenraum ohne besondere Anordnung oder Ausrichtung plaziert. Nach Abschluß der Behandlung wird die Dicke der Verbindungsschicht außen auf der Düse und in der Innenbohrung gemessen (Position siehe Abbildung).An injector as shown in one material 16MnCr5 is in a pressure-proof furnace in one Gas mixture of 50 vol.% Ammonia and 50 vol.% Nitrogen at 0.5 MPa for 2 hours at 500 ° C nitrided. The injectors are bulk goods in the batch room without any special arrangement or Alignment placed. After completing the treatment the thickness of the connection layer is outside on the Nozzle and measured in the inner bore (position see illustration).

Es ergeben sich folgende Werte:The following values result:

Bemerkenswert ist, daß die Austrittsbohrungen der Düse an der Düsenspitze mit einem Ausgangsdurchmesser von 0,2 mm und einer Länge von 1,5 mm in den Innenflächen durchnitriert sind. Die Schichtdicke ist gleich der Schichtdicke in der gesamten Innenbohrung der Düse.It is noteworthy that the outlet bores of the nozzle at the nozzle tip with an initial diameter of 0.2 mm and a length of 1.5 mm in the inner surfaces are nitrided. The layer thickness is equal to that Layer thickness in the entire inner bore of the nozzle.

Das gleiche Verfahren läßt sich auch als Aufkohlung mit Methan als Reaktivgas bei einem Druck von 0,8 MPa und einer Temperatur von 930°C durchführen. Man erhält hierbei ähnliche gleichmäßige Aufkohlungstiefen innen und außen wie beim Nitrieren.The same process can also be used as carburizing with methane as reactive gas at a pressure of 0.8 MPa and a temperature of 930 ° C. Man receives similar, uniform carburizing depths inside and outside like with nitriding.

Die hohe Konzentration an reaktiven Elementen im Behandungsgas, ermöglicht eine dichte Packung der Chargeneinzelteile. Bislang müssen zur gleichmäßigen Behandlung der Einzelteile gewisse, empirisch ermittelte Abstände zwischen den Einzelteilen eingehalten werden. Diese Abstände lassen sich bei Drücken <0,2 MPa verringern, ohne daß die Gleichmäßigkeit der Schichten darunter leidet.The high concentration of reactive elements in the Treatment gas, enables a tight packing of the Batch items. So far, have to be uniform Treatment of individual parts certain, empirically determined distances between the individual parts be respected. These distances can be Reduce pressures <0.2 MPa without the Uniformity of the layers suffers from it.

Beim Nitrokarburieren verwendet man als Reaktivgas Ammoniak/Stickstoffgemische mit Zusätzen aus Kohlendioxid oder Kohlenmonoxid und gegebenenfalls Luft, wobei der Volumenanteil dieser Zusätze im Bereich zwischen einigen und 50 Vol.% variieren kann.Nitro carburizing is used as a reactive gas Ammonia / nitrogen mixtures with additives Carbon dioxide or carbon monoxide and optionally Air, the volume fraction of these additives in Range can vary between a few and 50 vol.%.

Zum Aufkohlen lassen sich alle bekannten Aufkohlungsgase, wie Methan, Endogase, Stickstoff- Methanol- oder Erdgas-Luftgemische verwenden.All known can be carburized Carburizing gases such as methane, endogases, nitrogen Use methanol or natural gas / air mixtures.

Claims (6)

1. Verfahren zur gleichmäßigen thermochemischen Behandlung von Hohlkörpern und Bohrungen oder von außen schwer zugänglichen Flächen aufweisenden Bauteilen aus Stahl mit Reaktivgasen bei Temperaturen oberhalb 450°C, dadurch gekennzeichnet, daß die Behandlung bei Drücken oberhalb 0,2 MPa durchgeführt wird.1. A process for the uniform thermochemical treatment of hollow bodies and bores or components made of steel with reactive gases at temperatures above 450 ° C, which are difficult to access from the outside, characterized in that the treatment is carried out at pressures above 0.2 MPa. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß als Reaktivgas Ammoniak verwendet wird.2. The method according to claim 1, characterized, that ammonia is used as the reactive gas. 3. Verfahren nach Anspruch 1 und 2, dadurch gekennzeichnet, daß Gemische aus Ammoniak mit 5 bis 95 Vol.% Stickstoff verwendet werden.3. The method according to claim 1 and 2, characterized, that mixtures of ammonia with 5 to 95 vol.% Nitrogen can be used. 4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß als Reaktivgas ein kohlenstoffabgebendes Gas verwendet wird. 4. The method according to claim 1, characterized, that as a reactive gas, a carbon-donating gas is used.   5. Verfahren nach Anspruch 1 und 4, dadurch gekennzeichnet, daß Methan bei Temperaturen von 870 bis 1000°C verwendet wird.5. The method according to claim 1 and 4, characterized, that methane at temperatures from 870 to 1000 ° C is used. 6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Behandlung unter konstantem Druck durchgeführt wird.6. The method according to any one of claims 1 to 5, characterized, that the treatment under constant pressure is carried out.
DE4115135A 1991-05-08 1991-05-08 Expired - Lifetime DE4115135C1 (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
DE4115135A DE4115135C1 (en) 1991-05-08 1991-05-08
PL29152891A PL291528A1 (en) 1991-05-08 1991-08-26 Method of thermochemically treating in unoform manner hollow bodies and holes or structural components having surfaces not easily accessible from outside
TW080106842A TW223128B (en) 1991-05-08 1991-08-28
HU913870A HU209457B (en) 1991-05-08 1991-12-09 Process for uniform thermochemical treating of steel construction units having difficulty accessible surfaces
AT92105758T ATE139579T1 (en) 1991-05-08 1992-04-03 METHOD FOR THE EVEN THERMOCHEMICAL TREATMENT OF STEEL COMPONENTS THAT HAVE DIFFICULT TO ACCESS SURFACES
EP92105758A EP0512254B2 (en) 1991-05-08 1992-04-03 Process for uniform thermochemical treatment of steel pieces having difficult accessible areas
ES92105758T ES2088515T5 (en) 1991-05-08 1992-04-03 PROCEDURE FOR THE HOMOGENEOUS THERMAL CHEMICAL TREATMENT OF STRUCTURAL STEEL PIECES THAT HAVE DIFFICULT ACCESSIBLE SURFACES.
DE59206595T DE59206595D1 (en) 1991-05-08 1992-04-03 Process for the uniform thermochemical treatment of components made of steel that have difficult to access areas
CS19921375A CZ288263B6 (en) 1991-05-08 1992-05-06 Process of uniform thermal carburization of steel structural parts having areas that are difficult accessible from outside
JP11353092A JP3258071B2 (en) 1991-05-08 1992-05-06 Method of uniformly thermochemically treating steel components with hollow bodies and perforations or surfaces which are difficult to reach from the outside using reactive gases
SU925011449A RU2052535C1 (en) 1991-05-08 1992-05-07 Method for thermochemical treatment of hollow steel products

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
DE4115135C1 true DE4115135C1 (en) 1992-02-27

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DE4115135A Expired - Lifetime DE4115135C1 (en) 1991-05-08 1991-05-08
DE59206595T Expired - Lifetime DE59206595D1 (en) 1991-05-08 1992-04-03 Process for the uniform thermochemical treatment of components made of steel that have difficult to access areas

Family Applications After (1)

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DE59206595T Expired - Lifetime DE59206595D1 (en) 1991-05-08 1992-04-03 Process for the uniform thermochemical treatment of components made of steel that have difficult to access areas

Country Status (10)

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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10062862C2 (en) * 2000-12-16 2003-03-27 Ald Vacuum Techn Ag Device for the uniform thermochemical treatment of metallic workpieces with a reactive gas
US6776854B2 (en) 2001-02-28 2004-08-17 Vacuheat Gmbh Process and apparatus for the partial thermochemical vacuum treatment of metallic workpieces
DE102004058838A1 (en) * 2004-12-06 2006-07-13 Schramm, Armin Nozzle insert made of steel
DE102005061781A1 (en) * 2005-12-23 2007-06-28 Schaeffler Kg Injector for automotive fuel injection system has laser-cut micro detents in contact zone sidewall around piston

Families Citing this family (4)

* Cited by examiner, † Cited by third party
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DE4445154A1 (en) * 1994-12-17 1996-06-20 Fischer Artur Werke Gmbh Process for producing an expansion anchor made of corrosion-resistant steel
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HU209457B (en) 1994-06-28
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TW223128B (en) 1994-05-01
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EP0512254B1 (en) 1996-06-19
EP0512254A2 (en) 1992-11-11
ATE139579T1 (en) 1996-07-15
RU2052535C1 (en) 1996-01-20
ES2088515T3 (en) 1996-08-16
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EP0512254B2 (en) 2000-01-19
JPH05132753A (en) 1993-05-28

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