EP0485686A1 - Verfahren zum Nitrieren von Werkstücken aus Stahl unter Druck - Google Patents

Verfahren zum Nitrieren von Werkstücken aus Stahl unter Druck Download PDF

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Publication number
EP0485686A1
EP0485686A1 EP91104103A EP91104103A EP0485686A1 EP 0485686 A1 EP0485686 A1 EP 0485686A1 EP 91104103 A EP91104103 A EP 91104103A EP 91104103 A EP91104103 A EP 91104103A EP 0485686 A1 EP0485686 A1 EP 0485686A1
Authority
EP
European Patent Office
Prior art keywords
nitriding
ammonia
nitrogen
vol
under pressure
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
EP91104103A
Other languages
German (de)
English (en)
French (fr)
Inventor
Friedrich Dr. Dipl.-Phys. Preisser
Rudolf Dr. Dipl.-Ing. Seif
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.)
Evonik Operations 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
Application filed by Degussa GmbH filed Critical Degussa GmbH
Publication of EP0485686A1 publication Critical patent/EP0485686A1/de
Ceased legal-status Critical Current

Links

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
    • C23C8/24—Nitriding
    • C23C8/26—Nitriding of ferrous surfaces

Definitions

  • the invention relates to a method for nitriding steel workpieces in an atomic nitrogen-containing gas atmosphere at temperatures above 425 ° C. and pressures above 0.2 MPa.
  • nitriding layers are produced on workpieces made of steel alloys in a salt bath, by gas nitriding or by plasma nitriding. These layers improve the corrosion resistance, wear resistance and vibration resistance of the steels. They generally consist of a so-called compound layer a few micrometers thick over a nitrogen diffusion layer, which generally results from the above-mentioned processes with process times in the order of 100 hours.
  • gas nitriding in particular has boomed, with the steel parts being heated in an atmosphere of nitrogen-emitting gases, preferably in an ammonia atmosphere.
  • a pressure vessel with a certain amount of ammonia is charged and heated to temperatures between 425 o C and 640 o C (800-1200F) heated, an ammonia pressure of a few bars which builds up in the pressure vessel.
  • Nitride layers of 20 to 40 ⁇ m are obtained within about 15 hours, depending on the amount of ammonia, the pressure and the temperature. However, this procedure has not been able to establish itself in practice.
  • the gas atmosphere consists of 5 to 95% by volume of ammonia and 95 to 5% by volume of molecular nitrogen, and that the nitriding takes place at constant pressure.
  • the atomic nitrogen-releasing gas is ammonia, which dissociates into hydrogen and nitrogen at higher temperatures.
  • the use of pure ammonia without the addition of molecular nitrogen leads to clearly poorer connection layers. In this way, nitriding layers up to 50 ⁇ m are obtained in 4 to 5 hours.
  • connection layers are almost non-porous.
  • the ratio of the ⁇ '- to the ⁇ -phase can be set by the process parameters and in the best case is 100% ⁇ '-phase.
  • Austenitic and high-chrome steels can be nitrided without any chemical pretreatment. This method is suitable for treating workpieces without any geometric restrictions and in any number. The number is only determined by the available oven size.
  • a chamber furnace can typically be heated to temperatures up to 1200 o C at an absolute internal pressure of 0.2-10 MPa.
  • the treatment parameters temperature, time, absolute pressure and partial pressure of the nitrogen-releasing gas can be set in such a way that optimal treatment conditions result for each material. Values of 500 to 900 o C have proven to be favorable as nitriding temperatures. It is also important that nitriding is carried out under constant pressure throughout the nitriding time. Pressure fluctuations impair the good properties and the reproducibility of the connection layers.
  • the treatment time depends on the type of steel and the desired layer thickness.

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)
EP91104103A 1990-11-15 1991-03-16 Verfahren zum Nitrieren von Werkstücken aus Stahl unter Druck Ceased EP0485686A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4036381 1990-11-15
DE19904036381 DE4036381C1 (ko) 1990-11-15 1990-11-15

Publications (1)

Publication Number Publication Date
EP0485686A1 true EP0485686A1 (de) 1992-05-20

Family

ID=6418307

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91104103A Ceased EP0485686A1 (de) 1990-11-15 1991-03-16 Verfahren zum Nitrieren von Werkstücken aus Stahl unter Druck

Country Status (9)

Country Link
EP (1) EP0485686A1 (ko)
JP (1) JPH076053B2 (ko)
BR (1) BR9101780A (ko)
CA (1) CA2055541A1 (ko)
CS (1) CS336091A3 (ko)
DE (1) DE4036381C1 (ko)
PL (1) PL289794A1 (ko)
RU (1) RU2015197C1 (ko)
YU (1) YU47730B (ko)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0512254A2 (de) * 1991-05-08 1992-11-11 Degussa Ag Verfahren zur gleichmässigen thermochemischen Behandlung von Bauteilen aus Stahl, die schwer zugängliche Flächen aufweisen
US5292555A (en) * 1990-07-04 1994-03-08 Degussa Aktiengesellschaft Process for applying nitride layers to titanium
US5499861A (en) * 1992-07-16 1996-03-19 Giroflex-Entwicklungs-Ag Chair, in particular office chair

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW237484B (ko) * 1992-09-16 1995-01-01 Daido Oxygen
DE4333917C2 (de) * 1993-10-05 1994-06-23 Hans Prof Dr Ing Berns Randaufsticken zur Erzeugung einer hochfesten austenitischen Randschicht in nichtrostenden Stählen
FR2884879B1 (fr) * 2005-04-22 2007-08-03 Stephanois Rech Mec Couple d'organes de guidage dont l'un est en acier particulier conduisant a des performances ameliorees.
CN102994939B (zh) * 2013-01-07 2014-08-06 聊城市人和精工轴承有限公司 一种用于轴承保持器热处理的真空脉冲氮化工艺

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1319729A (fr) * 1962-04-12 1963-03-01 P I M Prodotti Per L Ind Metal Procédé et four de traitement en phase gazeuse, de cémentation, nitruration et analogue sur des pièces métalliques
GB1510158A (en) * 1976-07-09 1978-05-10 Rolls Royce Motors Ltd Nitriding of steel
GB2055404A (en) * 1979-06-26 1981-03-04 Lucas Industries Ltd Gas nitriding steel

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2779697A (en) * 1955-09-26 1957-01-29 United States Steel Corp Method of nitriding metallic surfaces

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1319729A (fr) * 1962-04-12 1963-03-01 P I M Prodotti Per L Ind Metal Procédé et four de traitement en phase gazeuse, de cémentation, nitruration et analogue sur des pièces métalliques
GB1510158A (en) * 1976-07-09 1978-05-10 Rolls Royce Motors Ltd Nitriding of steel
GB2055404A (en) * 1979-06-26 1981-03-04 Lucas Industries Ltd Gas nitriding steel

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, vol. 69, no. 55, 1968, Columbus, Ohio, US; abstract no. 29529Q, BELORUCHEV L. V.: 'improvements in the nitriding of steels' Seite 2767 ; *
CHEMICAL ABSTRACTS, vol. 72, no. 55, 1970, Columbus, Ohio, US; abstract no. 124218H, SUMAROKOV N.V.: 'experimental use of dilute ammonia for nitriding austenic steel' Seite 201 ; *
CHEMICAL ABSTRACTS, vol. 89, no. 4, 24. Juli 1978, Columbus, Ohio, US; abstract no. 28897J, OGAWA KIYOICHI: 'steel nitriding under pressure' Seite 281 ;Spalte 89 ; *
PATENT ABSTRACTS OF JAPAN vol. 12, no. 159 (C-495)(3006) 14. Mai 1988 & JP-A-62 270 761 ( ISHIKAWAJIMA HARIMA HEAVY IND ) 25. November 1987 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5292555A (en) * 1990-07-04 1994-03-08 Degussa Aktiengesellschaft Process for applying nitride layers to titanium
EP0512254A2 (de) * 1991-05-08 1992-11-11 Degussa Ag Verfahren zur gleichmässigen thermochemischen Behandlung von Bauteilen aus Stahl, die schwer zugängliche Flächen aufweisen
EP0512254A3 (en) * 1991-05-08 1993-03-24 Degussa Ag Process for uniform thermochemical treatment of steel pieces having difficult accessible areas
US5499861A (en) * 1992-07-16 1996-03-19 Giroflex-Entwicklungs-Ag Chair, in particular office chair

Also Published As

Publication number Publication date
YU47730B (sh) 1996-01-08
YU50691A (sh) 1993-11-16
CS336091A3 (en) 1992-06-17
RU2015197C1 (ru) 1994-06-30
JPH04268063A (ja) 1992-09-24
JPH076053B2 (ja) 1995-01-25
PL289794A1 (en) 1992-06-01
DE4036381C1 (ko) 1991-08-14
BR9101780A (pt) 1992-06-23
CA2055541A1 (en) 1992-05-16

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