EP0076488A2 - Procédé de production de couches de Fe2B sur des objets en alliages ferreux - Google Patents

Procédé de production de couches de Fe2B sur des objets en alliages ferreux Download PDF

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Publication number
EP0076488A2
EP0076488A2 EP82109090A EP82109090A EP0076488A2 EP 0076488 A2 EP0076488 A2 EP 0076488A2 EP 82109090 A EP82109090 A EP 82109090A EP 82109090 A EP82109090 A EP 82109090A EP 0076488 A2 EP0076488 A2 EP 0076488A2
Authority
EP
European Patent Office
Prior art keywords
gas
boron
furnace
layer
feb
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
EP82109090A
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German (de)
English (en)
Other versions
EP0076488B1 (fr
EP0076488A3 (en
Inventor
Fritz Dipl.-Ing. Hegewald
Franz Dipl.-Ing. Schmaderer
Lorenz Dr.-Ing. Singheiser
Georg Dr. Dipl.-Phys. Wahl
Günter Maag
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.)
ABB AG Germany
Original Assignee
Brown Boveri und Cie AG Germany
Asea Brown Boveri AG Germany
BBC Brown Boveri AG Germany
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.)
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Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6143372&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0076488(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Brown Boveri und Cie AG Germany, Asea Brown Boveri AG Germany, BBC Brown Boveri AG Germany filed Critical Brown Boveri und Cie AG Germany
Priority to AT82109090T priority Critical patent/ATE33152T1/de
Publication of EP0076488A2 publication Critical patent/EP0076488A2/fr
Publication of EP0076488A3 publication Critical patent/EP0076488A3/de
Application granted granted Critical
Publication of EP0076488B1 publication Critical patent/EP0076488B1/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

Definitions

  • the invention relates to a method for producing Fe 2 B layers on workpieces made of iron-based alloys in a heated reaction space, to which boron-containing gas is supplied together with carrier gases.
  • Wear-resistant Fe 2 B layers on low-alloy steels or other iron-based alloys are usually carried out in practice using the packing process.
  • the workpieces to be coated are packed in fine-grained powder and annealed at temperatures of approx. 800 ° C to 950 ° C.
  • These production methods for a wear-resistant Fe 2 B layer are very labor-intensive, since the workpieces to be coated are introduced into the glow boxes, are surrounded on all sides with borating powder and then sealed. After the process, the coated workpieces must be unpacked. The powder can no longer be used.
  • the cleaning of the workpieces is also very complex, since the boron powder depends on the heat treatment and Borierzeit, under certain circumstances adheres strongly in depressions of the workpiece. Borier powder is removed from the coated workpieces both mechanically and by washing with hot water.
  • the object of the invention is to provide a gaseous boronization process in which a deep Fe 2 B layer and only a small or no FeB layer is produced. This is desirable because the FeB layer is very brittle and tends to flake off.
  • boron-containing BC1 3 gas (boron trieloride) is fed to the reaction space under atmospheric pressure in a selectable mixture of N 2 and / or H 2 gas.
  • the proportion of BC1 3 gas is expediently chosen such that the percentage proportion of the mixture is below 5%, preferably below 2%.
  • the proportion of BC1 3 gas in the furnace atmosphere (in the reaction chamber) is regulated to a value between zero and 2%.
  • a high concentration of BC1 3 gas in the furnace atmosphere is chosen for the rapid build-up of a boride layer, specifically a layer of FeB and a layer of Fe 2 B underneath and in a second treatment section with a lower or zero concentration of BC1 3 gas in the furnace atmosphere, the thickness of the layer of FeB is reduced.
  • the second treatment section is expediently continued until the FeB layer has completely disappeared.
  • the arrangements for performing the method are expediently designed such that the surfaces surrounding the treatment room are predominantly made of metal exist and that the gas atmosphere in the treatment room is circulated several times before it leaves the room.
  • FIG. 1 An arrangement for producing FeB-free boride layers from the gas phase on iron-based alloys is shown schematically in the FIG.
  • the workpieces 1 to be coated are heated in a reaction vessel 2, the inner surfaces of which consist entirely or predominantly of / metal, under the action of a gas mixture to the desired coating temperature.
  • the gas composition is chosen so that the outer layer of parts 1 consists essentially of Fe 2 B and the proportion of FeB is as low as possible.
  • a gas mixture of H 2 -N 2 -BCl 3 gases is fed to the furnace chamber 3, optionally with the addition of HCI gas.
  • the use of all 4 gases is explained using the exemplary embodiment described. If necessary, the HCl gas can be eliminated, ie its share becomes zero.
  • the amount of gas is influenced by the valves 4, 5, 6 and 7 controlling the gas flow.
  • Manually adjustable control valves 4, 5 are provided for the N 2 and H 2 gases and control valves 6, 7 which can be influenced via control lines for the BC1 3 and HCl gases.
  • Flow meters 12, 13, 14 and 15 are arranged in the respective feed lines 8, 9, 10 and 11.
  • the BC1 3 and HCl gases are influenced via the control valves 6 and 7 as a function of the BC1 3 and HCl gas components determined in the gas analyzer 16.
  • the target values 18, 19 are compared with the actual values 20, 21 of the gas fractions determined in the gas analysis device 16.
  • the determined differential values act as control values 22, 23 on the control valves 6 and 7 and adjust them in such a way that the actual value approaches the predetermined target value.
  • the gas is released after leaving Ana Analyzer 16 supplied to a gas scrubber 24, in which HC1 and BC1 3 components are precipitated from the exhaust gas 25. This can be done, for example, by neutralization.
  • HC1 and BC1 3 components are precipitated from the exhaust gas 25.
  • This can be done, for example, by neutralization.
  • the H 2 portion is burned in a corresponding chamber 26.
  • the furnace chamber 3 is closed off in a heat-insulating manner from the outside atmosphere by a pot lid 27, which carries the fan 28.
  • the furnace space 3 is heated to the desired temperature by a heating winding 29 surrounding the reaction vessel 2. Furthermore, as can be seen from the figure, a fan 28 or the like is in the furnace space. provided for circulation of the gas atmosphere within the furnace space. For optimal guidance of the gas atmosphere, the treatment room 3 inside the reaction vessel 2 is provided with a gas guide cylinder 30.
  • the released boron is adsorbed by the metal surface and diffuses into the metal workpiece to form FeB or Fe 2 B.
  • the proportion of the BC1 3 gas in the carrier gas which consists of N 2 gas and / or H 2 gas, should be 5% or less, preferably less than 2%.
  • the content of BC1 3 gas in the furnace atmosphere is regulated in such a way that values are set which lie between zero and 2% BC1 3 gas.
  • the deposition of FeB and Fe 2 B in the outer layer can be influenced by changing the percentages of gases in the furnace atmosphere.
  • the supply of HCl gas or BC1 3 is most suitably influenced.
  • the FeB formation is reduced in favor of the Fe 2 B formation, since at a constant temperature the activity of the boron on the metal surface is reduced by increasing the HCI concentration in the gas phase.
  • the gas atmosphere should be circulated with the continuous supply of reaction gases, so that a homogeneous gas composition is ensured everywhere in the furnace space.
  • the thickness of the FeB or Fe 2 B layer can also be influenced by the annealing time and the boronization temperature.
  • the growth of the boride layers takes place according to a 'parabolic time law with rate-determining boron diffusion into the alloy.
  • layers of FeB which are formed on the surface of the workpieces when the boronation is not optimal in terms of gas and temperature, can be achieved by a targeted exclusive diffusion annealing in a very low BC1 3 or BC1 3 free atmosphere to the desired Fe 2 B can convert.

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  • 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)
  • Chemically Coating (AREA)
EP82109090A 1981-10-03 1982-10-01 Procédé de production de couches de Fe2B sur des objets en alliages ferreux Expired EP0076488B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82109090T ATE33152T1 (de) 1981-10-03 1982-10-01 Verfahren zur herstellung von fe2b-schichten auf werkstuecken aus eisenbasislegierungen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3139462 1981-10-03
DE19813139462 DE3139462A1 (de) 1981-10-03 1981-10-03 Verfahren zur herstellung von fe(pfeil abwaerts)2(pfeil abwaerts)b-schichten auf werkstcken aus eisenbasislegierungen

Publications (3)

Publication Number Publication Date
EP0076488A2 true EP0076488A2 (fr) 1983-04-13
EP0076488A3 EP0076488A3 (en) 1984-08-22
EP0076488B1 EP0076488B1 (fr) 1988-03-23

Family

ID=6143372

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82109090A Expired EP0076488B1 (fr) 1981-10-03 1982-10-01 Procédé de production de couches de Fe2B sur des objets en alliages ferreux

Country Status (3)

Country Link
EP (1) EP0076488B1 (fr)
AT (1) ATE33152T1 (fr)
DE (2) DE3139462A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD85695A (fr) *
US2168028A (en) * 1938-01-12 1939-08-01 Leeds & Northrup Co Heat treating system
GB911479A (en) * 1960-06-17 1962-11-28 Maag Zahnraeder & Maschinen Ag Process for carburising the surface layer of steel articles

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH623184GA3 (en) * 1973-04-24 1981-05-29 Element for timing instrument

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD85695A (fr) *
US2168028A (en) * 1938-01-12 1939-08-01 Leeds & Northrup Co Heat treating system
GB911479A (en) * 1960-06-17 1962-11-28 Maag Zahnraeder & Maschinen Ag Process for carburising the surface layer of steel articles

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Härterei Technische Mitteilungen 39 (1984) S. 7-15 *
HÄRTEREI-TECHN. MITT. 22, Heft 4, 1967, Seiten 275-292 *

Also Published As

Publication number Publication date
DE3278266D1 (en) 1988-04-28
EP0076488B1 (fr) 1988-03-23
EP0076488A3 (en) 1984-08-22
ATE33152T1 (de) 1988-04-15
DE3139462A1 (de) 1983-04-21

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