EP0387536B1 - Verfahren zum Borieren von Eisenteilen - Google Patents

Verfahren zum Borieren von Eisenteilen Download PDF

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Publication number
EP0387536B1
EP0387536B1 EP90102922A EP90102922A EP0387536B1 EP 0387536 B1 EP0387536 B1 EP 0387536B1 EP 90102922 A EP90102922 A EP 90102922A EP 90102922 A EP90102922 A EP 90102922A EP 0387536 B1 EP0387536 B1 EP 0387536B1
Authority
EP
European Patent Office
Prior art keywords
batch
temperature
boriding
parts
heated
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
EP90102922A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0387536A1 (de
Inventor
Peter Dipl.-Ing. Karojet
Helmut Dr. Chem. Kunst
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.)
Durferrit GmbH Thermotechnik
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 EP0387536A1 publication Critical patent/EP0387536A1/de
Application granted granted Critical
Publication of EP0387536B1 publication Critical patent/EP0387536B1/de
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
    • C23C8/60—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 solids, e.g. powders, pastes
    • C23C8/62—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 solids, e.g. powders, pastes only one element being applied
    • C23C8/68—Boronising
    • C23C8/70—Boronising of ferrous surfaces

Definitions

  • the invention relates to a method for boronizing parts made of ferrous materials by covering the surfaces to be boronized with a powder, a granulate or a paste of a borating agent and heating the batch under protective gas to temperatures of 850 ° C. and higher in a continuous furnace.
  • Boronizing for wear protection of parts made of iron and steel has been a well-known process.
  • dense, uniform layers of the respective boride are formed, on iron e.g. the borides FeB and Fe2B.
  • the borides have significantly changed properties; in particular, most borides are very hard, corrosion-resistant and therefore extremely wear-resistant.
  • the boride layers are firmly connected to the base material by diffusion.
  • the boronization temperatures for iron materials are usually between 850 and 950 ° C, the usual layer thicknesses between 30 and 150 ⁇ m. Since the two borides Fe2B and FeB have different properties and multiphase layers usually have worse properties than monophase, efforts are made to produce monophase layers during boronizing.
  • boriding in solid boriding agents is used almost exclusively.
  • the parts to be treated are packed in iron boxes in a boron-releasing powder, usually mixtures of boron carbide, aluminum oxide, silicon oxide and the like, with activating additives such as ammonium fluoride or potassium borofluoride (e.g. DE-A-1 796 212).
  • activating additives such as ammonium fluoride or potassium borofluoride (e.g. DE-A-1 796 212).
  • the boxes are tightly sealed and annealed for a while, the desired boride layers being formed in direct solid-to-solid reactions or by transporting the boron over the gas phase.
  • Boring with a paste is also known, the borating agent being applied to the parts in paste form.
  • Paste boriding is carried out under protective gas, preferably in a continuous furnace, the parts being exposed to temperatures of up to 900 ° C.
  • Fe2B iron boride
  • This object is achieved in that the parts are first heated to a temperature of 550 to 600 ° C, then wait for a temperature equalization within the batch without further temperature increase and then heated as quickly as possible to the boronizing temperature of 850 ° C and higher .
  • the batch is preferably held at a temperature of 550 to 600 ° C. for 8 to 20 minutes and the subsequent heating of the batch to the boronizing temperature of 850 ° C. and higher is advantageously carried out in a period of at most 15 minutes.
  • Sheet metal parts made of C 45 steel were packed in boxes made of heat-resistant material in a borating agent consisting of boron carbide, silicon carbide and potassium borofluoride.
  • the boxes filled with the borating agent and the parts therein and closed with a lid were placed on the conveyor belt of a continuous furnace and heated as follows: from room temperature to 580 ° C. within 30 minutes. Hold at this temperature until the temperature inside the box has equalized (9 minutes). Warm up to 880 ° C within 8 minutes, hold above this temperature for 32 minutes, then cool to room temperature within 68 minutes.
  • a mixture of nitrogen and hydrogen was used as the protective gas in the continuous furnace.
  • the layer obtained in the manner described had an average thickness of 33 ⁇ m with scatterings of ⁇ 3 ⁇ m. The layer only had individual FeB teeth on the edges and was otherwise FeB-free.
  • Screw wheels made of 42 CrMo4 steel were packed in a box in the boron material as in Example 1 and the boxes placed on the conveyor belt of the continuous furnace. Treatment conditions:

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)
  • Sampling And Sample Adjustment (AREA)
  • Drilling Tools (AREA)
  • Chemical Vapour Deposition (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Catalysts (AREA)
  • Drilling And Boring (AREA)
EP90102922A 1989-03-14 1990-02-15 Verfahren zum Borieren von Eisenteilen Expired - Lifetime EP0387536B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3908200 1989-03-14
DE3908200A DE3908200C1 (ja) 1989-03-14 1989-03-14

Publications (2)

Publication Number Publication Date
EP0387536A1 EP0387536A1 (de) 1990-09-19
EP0387536B1 true EP0387536B1 (de) 1993-06-30

Family

ID=6376267

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90102922A Expired - Lifetime EP0387536B1 (de) 1989-03-14 1990-02-15 Verfahren zum Borieren von Eisenteilen

Country Status (6)

Country Link
EP (1) EP0387536B1 (ja)
JP (1) JPH0310062A (ja)
AT (1) ATE91158T1 (ja)
DE (2) DE3908200C1 (ja)
DK (1) DK0387536T3 (ja)
ES (1) ES2044259T3 (ja)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE215132T1 (de) * 1997-12-15 2002-04-15 Volkswagen Ag Plasmaborierung
US8894770B2 (en) 2012-03-14 2014-11-25 Andritz Iggesund Tools Inc. Process and apparatus to treat metal surfaces

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1796212B1 (de) * 1968-09-21 1972-05-31 Inst Haerterei Technik Verfahren zum borieren von titan und seinen legierungen
DE2633137A1 (de) * 1976-07-23 1978-02-02 Degussa Borierungsmittel zum borieren von massenteilen aus eisen und nichteisenmetallen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2361017C3 (de) * 1973-12-04 1985-12-05 Vac-Hyd Processing Gmbh, 2358 Kaltenkirchen Verfahren zum Borieren der Oberfläche eines metallischen Werkstücks

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1796212B1 (de) * 1968-09-21 1972-05-31 Inst Haerterei Technik Verfahren zum borieren von titan und seinen legierungen
DE2633137A1 (de) * 1976-07-23 1978-02-02 Degussa Borierungsmittel zum borieren von massenteilen aus eisen und nichteisenmetallen

Also Published As

Publication number Publication date
JPH0310062A (ja) 1991-01-17
DE59001874D1 (de) 1993-08-05
DE3908200C1 (ja) 1989-09-07
EP0387536A1 (de) 1990-09-19
ATE91158T1 (de) 1993-07-15
DK0387536T3 (da) 1993-08-02
ES2044259T3 (es) 1994-01-01

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