EP0089885A2 - Verfahren zur Oberflächenhärtung von Metallteilen - Google Patents

Verfahren zur Oberflächenhärtung von Metallteilen Download PDF

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Publication number
EP0089885A2
EP0089885A2 EP83400541A EP83400541A EP0089885A2 EP 0089885 A2 EP0089885 A2 EP 0089885A2 EP 83400541 A EP83400541 A EP 83400541A EP 83400541 A EP83400541 A EP 83400541A EP 0089885 A2 EP0089885 A2 EP 0089885A2
Authority
EP
European Patent Office
Prior art keywords
parts
volume
gas
ammonia
gas mixture
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
EP83400541A
Other languages
English (en)
French (fr)
Other versions
EP0089885A3 (en
EP0089885B1 (de
Inventor
Michel Madsac
Thierry Hiron
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.)
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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 Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical Air Liquide SA
Priority to AT83400541T priority Critical patent/ATE29154T1/de
Publication of EP0089885A2 publication Critical patent/EP0089885A2/de
Publication of EP0089885A3 publication Critical patent/EP0089885A3/fr
Application granted granted Critical
Publication of EP0089885B1 publication Critical patent/EP0089885B1/de
Expired legal-status Critical Current

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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
    • C23C8/24—Nitriding
    • C23C8/26—Nitriding 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
    • C23C8/28—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 more than one element being applied in one step
    • C23C8/30—Carbo-nitriding
    • C23C8/32—Carbo-nitriding of ferrous surfaces

Definitions

  • nitriding or nitrocarburizing treatments in the gas phase are intended to improve the resistance to fatigue and seizure and to increase the resistance to wear and to corrosion of steels.
  • the nitriding atmospheres used at present consist either of gaseous ammonia or of gaseous ammonia diluted in nitrogen, or of gaseous ammonia, optionally diluted in nitrogen, in mixture with a compound capable of increasing the degree of dissociation of the amnoniac in contact with the part and therefore the kinetics of nitriding; this compound is, for example, an oxidizing compound such as oxygen, carbon dioxide, water vapor, or else a hydrocarbon.
  • a mixture of amino-gas and a carbon-bearing gas for example an endothemical gas (CO-H 2 -CO 2 - H 2 O-CH 4 -N 2 ), is used or a hydrocarbon; then there is nitrocarburization with the formation of carbonitrides ⁇ .
  • a carbon-bearing gas for example an endothemical gas (CO-H 2 -CO 2 - H 2 O-CH 4 -N 2 )
  • CO-H 2 -CO 2 - H 2 O-CH 4 -N 2 an endothemical gas
  • the subject of the invention is a method of surface hardening of metal parts, in particular of steel parts, by nitriding or nitrocarburizing which makes it possible to remedy the disadvantages mentioned above.
  • the process according to the invention consists in placing the parts in an oven and in maintaining them, at a temperature between 490 ° C and 750 ° C, in an atmosphere formed by the introduction into said oven of a gaseous mixture comprising in particular of the amimmor and a compound accelerating the catalytic dissociation of the armoniac in contact with said parts consisting of an oxidizing gas.
  • a gaseous mixture comprising in particular of the amimmor and a compound accelerating the catalytic dissociation of the armoniac in contact with said parts consisting of an oxidizing gas.
  • said oxidizing gas is nitrous oxide, said gaseous mixture containing approximately 0.1% to 10% by volume of said nitrous oxide.
  • said gaseous mixture can contain approximately 10% to 99% by volume of ammonia and at most 90% by volume of nitrogen.
  • said gaseous mixture also contains hydrogen in a concentration of at most 25% by volume.
  • said gaseous mixture also contains a carbon-bearing gas.
  • This carbon-bearing gas is constituted, for example, either by a hydrocarbon, such as methane or propane, in a concentration of at most 25% by volume, or by methanol in a concentration of at most 54% by volume , or by a mixture of these two compounds.
  • the treatment is carried out in an oven of the "well" type shown diagrammatically in the attached figure.
  • This oven (1) is made of refractory material (2) coated internally with a steel jacket (3); it is fitted with heating resistors (4) and a cover (5).
  • the steel part to be treated represented in the form of a block (6), is placed inside the oven in a basket (7) which rests on a grid (8) supported by a base (9) placed on the bottom of the oven (1).
  • a turbine (10) the function of which is to continuously stir the atmosphere of the oven, is placed at a distance above the basket (7).
  • the constituents of the treatment gas mixture are fed continuously into the oven (1), either from a mixer (11), or separately, by one or more conduits (12), provided with one or more valves (13), passing through the cover (5).
  • This gaseous mixture is discharged from the oven, also continuously, through the conduit (14).
  • the treated parts are then cooled by quenching in an oil bath (not shown in the figure).
  • steel parts of grade 35CD4 are treated, and on the other hand, parts of nitriding steel of grade 40CAD612, with a gas mixture consisting of 40% NH 3 , 3% N 2 0 and 57% N 2 at a temperature of 570 ° C.
  • the oven (1) is previously heated to a temperature of 570 ° C.
  • the gaseous mixture (40% NH 3 - 3% N 2 0 - 57% N 2 ) ' from the mixer (11) is then brought into the oven (1) and it is circulated there for a certain time.
  • the part to be treated is then placed in the basket (7) which is placed in the oven (1).
  • the NH 3 - N 2 0 - N 2 gas mixture is then continuously circulated in the oven at a flow rate of 0.25 m 3 / hour.
  • the rate of renewal of the furnace atmosphere is 5 times per hour.
  • Steel parts of grade 35CD4 are treated with a gas mixture consisting of 40% NH 3 , 3% N 2 0, 10% H 2 and 37% N 2 , respectively for three hours and four hours, under conditions identical to those of example 1 (same temperature, same flow rate of the gas mixture, same rate of renewal of the furnace atmosphere).
  • Steel parts of grade 35CD4 are treated with a gas mixture consisting of 40% NH 3 , 3% N 2 0, 5% C 3 H 8 and 5 2 % N 2 , p for four hours, under identical conditions. to those of Example 1 (temperature, flow rate, renewal rate).
  • a first treatment was carried out for three hours with a gaseous mixture consisting of 40% NH 3 , 10% CO 2 and 50% N 2 , on the one hand on steel parts 35CD4, on the other hand on steel parts. 40CAD612 steel.
  • the thickness and hardness measurements of the nitrided layers of the parts thus treated gave the following results:
  • a third treatment was carried out for three hours with a gas mixture consisting of 40% NH 3 , 24% H 2 , 12% CO, 24% N 2 , 1.7% CO 2 and 2% H 2 0, of a part on steel parts 35CD4, on the other hand on steel parts 40CAD612.
  • the thickness and hardness measurements of the nitrided layers of the parts thus treated gave the following results:

Landscapes

  • 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)
  • Heat Treatment Of Articles (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Forging (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
EP83400541A 1982-03-23 1983-03-16 Verfahren zur Oberflächenhärtung von Metallteilen Expired EP0089885B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83400541T ATE29154T1 (de) 1982-03-23 1983-03-16 Verfahren zur oberflaechenhaertung von metallteilen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8204874A FR2524006B1 (fr) 1982-03-23 1982-03-23 Procede de durcissement superficiel de pieces metalliques
FR8204874 1982-03-23

Publications (3)

Publication Number Publication Date
EP0089885A2 true EP0089885A2 (de) 1983-09-28
EP0089885A3 EP0089885A3 (en) 1984-12-05
EP0089885B1 EP0089885B1 (de) 1987-08-26

Family

ID=9272268

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83400541A Expired EP0089885B1 (de) 1982-03-23 1983-03-16 Verfahren zur Oberflächenhärtung von Metallteilen

Country Status (10)

Country Link
US (1) US4531984A (de)
EP (1) EP0089885B1 (de)
JP (1) JPS58174573A (de)
AT (1) ATE29154T1 (de)
AU (1) AU554394B2 (de)
CA (1) CA1215901A (de)
DE (1) DE3373197D1 (de)
ES (1) ES8402361A1 (de)
FR (1) FR2524006B1 (de)
ZA (1) ZA831884B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2719057A1 (fr) * 1994-04-22 1995-10-27 Innovatique Sa Procédé pour la nitruration à bsase pression d'une pièce métallique et four pour la mise en Óoeuvre dudit procédé.
WO1995029269A1 (fr) * 1994-04-22 1995-11-02 Innovatique S.A. Procede pour la nitruration a basse pression d'une piece metallique et four pour la mise en ×uvre dudit procede
DE10003526A1 (de) * 2000-01-27 2001-08-09 Messer Griesheim Gmbh Frankfur Verfahren zum Karbonitrieren von kohlenstoffreichen und hochlegierten Stählen
FR2999609A1 (fr) * 2012-12-13 2014-06-20 Peugeot Citroen Automobiles Sa Procede de renforcement de l'acier par effets thermochimiques et effet de re-austenitisation

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8608717D0 (en) * 1986-04-10 1986-05-14 Lucas Ind Plc Metal components
JP2584217B2 (ja) * 1986-11-18 1997-02-26 株式会社豊田中央研究所 表面処理方法
FR2649123B1 (fr) * 1989-06-30 1991-09-13 Air Liquide Procede de traitement thermique de metaux
DE4016183A1 (de) * 1990-05-19 1991-11-21 Linde Ag Verfahren zur verbesserten bereitstellung von behandlungsgas bei waermebehandlungen
US5298090A (en) * 1992-12-22 1994-03-29 Air Products And Chemicals, Inc. Atmospheres for heat treating non-ferrous metals and alloys
US5421914A (en) * 1993-10-12 1995-06-06 The University Of Chicago Surface modification of high temperature iron alloys
JP3495590B2 (ja) * 1997-06-30 2004-02-09 アイシン・エィ・ダブリュ株式会社 軟窒化処理を施した歯車並びにその製造方法
EP1122330B1 (de) * 2000-02-04 2004-10-27 Ipsen International GmbH Verfahren und Verwendung einer Vorrichtung zum Nitrocarburieren von Eisenwerkstoffen
DE50001540D1 (de) * 2000-02-04 2003-04-30 Ipsen Int Gmbh Verfahren zum Nitrieren und/oder Nitrocarburieren von höher legierten Stählen
GB2383800A (en) * 2001-07-25 2003-07-09 Nsk Europ Technology Co Ltd Performance enhancement of steel auxiliary bearing components
JP2005539138A (ja) * 2002-09-16 2005-12-22 ボーグワーナー・インコーポレーテッド 長寿命ターボチャージャノズルリングに特に適した耐熱合金
DE112006003545B4 (de) * 2005-12-28 2018-05-17 Mitsuba Corp. Motor-Anlasser
RU2478137C2 (ru) * 2011-06-29 2013-03-27 Открытое акционерное общество "АВТОВАЗ" Способ химико-термической обработки стальных изделий
KR101215380B1 (ko) 2012-07-24 2012-12-26 (주) 유창스틸산업 가스질화법을 이용한 강재 표면 개질 방법 및 이를 이용하여 제조된 강재
CN102914151A (zh) * 2012-11-20 2013-02-06 昆山市大金机械设备厂 金属熔液保持器
DE102014004311A1 (de) * 2014-03-25 2015-10-01 Andreas Stihl Ag & Co. Kg Kette für ein Arbeitsgerät, Verfahren zur Herstellung eines Bolzens für eine Kette und Verfahren zur Herstellung eines Treibglieds für eine Kette
JP6357042B2 (ja) * 2014-07-18 2018-07-11 株式会社日本テクノ ガス軟窒化方法およびガス軟窒化装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD47847A (de) *
FR711748A (fr) * 1930-02-26 1931-09-16 Electro Metallurg Co Procédé de cémentation
FR711749A (fr) * 1930-02-26 1931-09-16 Electro Metallurg Co Procédé de cémentation par nitruration
CH410904A (de) * 1962-07-12 1966-04-15 Lonza Ag Verfahren zur Verhütung von Korrosionen bei der Harnstoffsynthese
DE1521172A1 (de) * 1966-10-14 1969-07-31 Meinrad Behringer Fa Verfahren zum Haerten von Stahl durch Nitrierung und Vorrichtung zur Durchfuehrung dieses Verfahrens
FR2388896A2 (fr) * 1977-04-27 1978-11-24 Air Prod & Chem Procede de traitement thermique de metaux ferreux
GB2049740A (en) * 1979-05-15 1980-12-31 Huyton Heat Treatments Ltd Improvements in or relating to case hardening

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1793309A (en) * 1930-02-26 1931-02-17 Electro Metallurg Co Process of case hardening
FR2446322A2 (fr) * 1979-01-15 1980-08-08 Air Liquide Procede de traitement thermique de l'acier et de controle dudit traitement

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD47847A (de) *
FR711748A (fr) * 1930-02-26 1931-09-16 Electro Metallurg Co Procédé de cémentation
FR711749A (fr) * 1930-02-26 1931-09-16 Electro Metallurg Co Procédé de cémentation par nitruration
CH410904A (de) * 1962-07-12 1966-04-15 Lonza Ag Verfahren zur Verhütung von Korrosionen bei der Harnstoffsynthese
DE1521172A1 (de) * 1966-10-14 1969-07-31 Meinrad Behringer Fa Verfahren zum Haerten von Stahl durch Nitrierung und Vorrichtung zur Durchfuehrung dieses Verfahrens
FR2388896A2 (fr) * 1977-04-27 1978-11-24 Air Prod & Chem Procede de traitement thermique de metaux ferreux
GB2049740A (en) * 1979-05-15 1980-12-31 Huyton Heat Treatments Ltd Improvements in or relating to case hardening

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, vol. 39, 1945, colonne 901, résumé no. 8, Columbus, Ohio, US; & SU - A - 59 087 (A.P. SIZOV) 28-02-1941 *
HÄRTEREITECHNISCHE MITTEILUNGEN, vol. 35, no. 6, juin 1980, pages 284-288, Munich, DE; G. BOUTTIER et al.: "Schutzgasatmosphäre auf Stickstoff-Basis" *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2719057A1 (fr) * 1994-04-22 1995-10-27 Innovatique Sa Procédé pour la nitruration à bsase pression d'une pièce métallique et four pour la mise en Óoeuvre dudit procédé.
WO1995029269A1 (fr) * 1994-04-22 1995-11-02 Innovatique S.A. Procede pour la nitruration a basse pression d'une piece metallique et four pour la mise en ×uvre dudit procede
DE10003526A1 (de) * 2000-01-27 2001-08-09 Messer Griesheim Gmbh Frankfur Verfahren zum Karbonitrieren von kohlenstoffreichen und hochlegierten Stählen
FR2999609A1 (fr) * 2012-12-13 2014-06-20 Peugeot Citroen Automobiles Sa Procede de renforcement de l'acier par effets thermochimiques et effet de re-austenitisation

Also Published As

Publication number Publication date
AU554394B2 (en) 1986-08-21
FR2524006B1 (fr) 1985-10-11
JPS58174573A (ja) 1983-10-13
ZA831884B (en) 1983-11-30
EP0089885A3 (en) 1984-12-05
US4531984A (en) 1985-07-30
ES520824A0 (es) 1984-01-16
FR2524006A1 (fr) 1983-09-30
CA1215901A (fr) 1986-12-30
DE3373197D1 (en) 1987-10-01
ATE29154T1 (de) 1987-09-15
ES8402361A1 (es) 1984-01-16
EP0089885B1 (de) 1987-08-26
AU1253583A (en) 1983-09-29

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