EP0659900A1 - Container for boroniding metallic articles - Google Patents

Container for boroniding metallic articles Download PDF

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Publication number
EP0659900A1
EP0659900A1 EP94117833A EP94117833A EP0659900A1 EP 0659900 A1 EP0659900 A1 EP 0659900A1 EP 94117833 A EP94117833 A EP 94117833A EP 94117833 A EP94117833 A EP 94117833A EP 0659900 A1 EP0659900 A1 EP 0659900A1
Authority
EP
European Patent Office
Prior art keywords
container
copper
iron
boronizing
boron powder
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
EP94117833A
Other languages
German (de)
French (fr)
Other versions
EP0659900B1 (en
Inventor
Tetsuo Honda
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
Parker Netsushori Kogyo KK
Original Assignee
Durferrit GmbH Thermotechnik
Parker Netsushori Kogyo KK
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Publication date
Application filed by Durferrit GmbH Thermotechnik, Parker Netsushori Kogyo KK filed Critical Durferrit GmbH Thermotechnik
Publication of EP0659900A1 publication Critical patent/EP0659900A1/en
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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
    • C23C8/60—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
    • 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

Definitions

  • the invention relates to a container for boronizing metal parts with powders and granules of a borating agent.
  • a known method for boriding metal parts is carried out by placing the parts in an iron crucible, arranging a boronizing agent in powder or granule form all around, covering it with an iron lid and inserting the crucible into an oven with the appropriate boronizing temperature and boroning time .
  • boron powder or granules consist of boron-releasing substances, activators and binders and are described for example in DE-PS 21 27 096.
  • the inner wall of the iron crucible is also always borated, so that iron boride layers form, which flake off after some time and contaminate the recovered boron powder. These impurities cannot be prevented.
  • the iron boride particles in the borating agent also lead to defective parts with insufficiently hardened areas during boronizing (soft spots). Boronizing the inner wall of the container leads to an unnecessary consumption and a shorter duration of action of the borating agent.
  • the container and the lid are preferably made of iron or iron alloys and are coated with copper on the inside, at least in the areas that come into contact with the borating powder or granulate.
  • the copper layer can be lined, clad or thermally sprayed on.
  • Containers and lids can just as well consist of solid copper.
  • the figure shows schematically in an exemplary embodiment a container according to the invention with boron powder granules in longitudinal section.
  • the metal parts (5) to be borated are located in a container (3) made of solid copper, surrounded by the boron powder granules (6).
  • the boron powder granulate (6) is covered with a lid (4) made of copper.
  • a container (1) made of iron or iron alloys surrounds the container (3) made of copper, an iron lid (2) covers the copper lid (4).
  • an iron container can of course also be used, the inner wall of which is made of copper.
  • Copper is understood to mean pure copper and copper with the usual impurities. Low-alloy copper alloys can also be used.

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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)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Processing Of Solid Wastes (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Powder Metallurgy (AREA)

Abstract

Metal parts are borided with a boron powder or boron powder granulate using a container whose parts which come into contact with the boriding agent granulate are made of copper. This prolongs the active life of the boriding agent.

Description

Die Erfindung betrifft einen Behälter zum Borieren von Metallteilen mit Pulvern und Granulaten eines Boriermittels.The invention relates to a container for boronizing metal parts with powders and granules of a borating agent.

Ein bekanntes Verfahren zum Borieren von Metallteilen wird durchgeführt, indem man die Teile in einen Eisentiegel gibt, rundum ein Boriermittel in Pulver- oder Granulatform anordnet, es mit einem Deckel aus Eisen abdeckt und den Tiegel in einen Ofen einführt, mit der entsprechenden Boriertemperatur und Borierdauer. Solche Borierpulver- bzw. -granulate bestehen aus borabgebenden Substanzen, Aktivatoren und Bindemitteln und sind beispielsweise in der DE-PS 21 27 096 beschrieben.A known method for boriding metal parts is carried out by placing the parts in an iron crucible, arranging a boronizing agent in powder or granule form all around, covering it with an iron lid and inserting the crucible into an oven with the appropriate boronizing temperature and boroning time . Such boron powder or granules consist of boron-releasing substances, activators and binders and are described for example in DE-PS 21 27 096.

Bei diesem Borierverfahren ist es notwendig, nach dem Auspacken der borierten Teile und Wiederverwendung des Boriermittels, jedesmal 20 bis 30 % neues Boriermittel für ein erneutes Borieren zuzusetzen, da das Mittel an Borierwirkung verliert und ein Teil des Pulvers bzw. Granulats an der Behälterwandung festhaftet. Das Boriermittelgranulat kann daher nur zwei- bis dreimal wiederverwendet werden. Bei weiterer Verwendung entsteht Ausschußware, da die Teile nur ungenügend boriert werden.In this boriding process, it is necessary to add 20 to 30% new boronizing agent for re-boronizing after unpacking the borated parts and reusing the borating agent, since the agent loses its borating effect and part of the powder or granulate adheres to the container wall. The pelletizing agent can therefore only be reused two or three times. When used again, rejects are produced because the parts are only insufficiently borated.

Weiterhin wird die Innenwand des Eisentiegels ebenfalls stets boriert, so daß sich Eisenboridschichten bilden, die nach einiger Zeit abplatzen und das zurückgwonnene Borierpulver verunreinigen. Diese Verunreinigungen lassen sich nicht verhindern. Die Eisenboridteilchen im Boriermittel führen beim Borieren ebenfalls zu fehlerhaften Teilen mit nicht ausreichend gehärteten Stellen (soft spots). Das Borieren der Innenwand des Behälters führt zu einem überflüssigen Verbrauch und einer kürzeren Wirkungsdauer des Boriermittels.Furthermore, the inner wall of the iron crucible is also always borated, so that iron boride layers form, which flake off after some time and contaminate the recovered boron powder. These impurities cannot be prevented. The iron boride particles in the borating agent also lead to defective parts with insufficiently hardened areas during boronizing (soft spots). Boronizing the inner wall of the container leads to an unnecessary consumption and a shorter duration of action of the borating agent.

Es war daher Aufgabe der vorliegenden Erfindung, einen Behälter zum Borieren von Metallteilen mit Borierpulvern oder Borierpulvergranulaten zu schaffen, mit dem der Verlust von Boriermittel minimiert wird und auf dem keine abplatzenden Borierschichten entstehen, die zu "soft spots" auf den borierten Teilen führen.It was therefore an object of the present invention to provide a container for the boronization of metal parts with boron powders or boron powder granules, with which the loss of boronant is minimized and on which no flaking boron layers are formed which lead to "soft spots" on the borated parts.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß zumindest die Teile des Behälters und des Deckels, die mit dem Boriermittel in Berührung kommen, aus Kupfer bestehen.This object is achieved in that at least the parts of the container and the lid which come into contact with the borating agent consist of copper.

Vorzugsweise besteht der Behälter und der Deckel aus Eisen oder Eisenlegierungen und ist auf der Innenseite, zumindest in den Bereichen, die mit dem Borierpulver bzw. -granulat in Berührung kommen, mit Kupfer beschichtet. Dabei kann die Kupferschicht aufgelegt (lined), aufplattiert oder thermisch aufgespritzt sein.The container and the lid are preferably made of iron or iron alloys and are coated with copper on the inside, at least in the areas that come into contact with the borating powder or granulate. The copper layer can be lined, clad or thermally sprayed on.

Genausogut können Behälter und Deckel aus massivem Kupfer bestehen.Containers and lids can just as well consist of solid copper.

Ebenfalls vorteilhaft ist es, einen Kupferbehälter in einen üblichen Behälter aus Eisen oder Eisenlegierungen einzupassen.It is also advantageous to fit a copper container into a conventional container made of iron or iron alloys.

Die Abbildung zeigt schematisch in beispielhafter Ausführungsform einen erfindungsgemäßen Behälter mit Borierpulvergranulat im Längsschnitt. In einem Behälter (3) aus massivem Kupfer befinden sich die zu borierenden Metallteile (5), umgeben von dem Borierpulvergranulat (6).The figure shows schematically in an exemplary embodiment a container according to the invention with boron powder granules in longitudinal section. The metal parts (5) to be borated are located in a container (3) made of solid copper, surrounded by the boron powder granules (6).

Abgedeckt wird das Borierpulvergranulat (6) mit einem Deckel (4) aus Kupfer. Ein Behälter (1) aus Eisen oder Eisenlegierungen umgibt den Behälter (3) aus Kupfer, ein Eisendeckel (2) bedeckt den Kupferdeckel (4).The boron powder granulate (6) is covered with a lid (4) made of copper. A container (1) made of iron or iron alloys surrounds the container (3) made of copper, an iron lid (2) covers the copper lid (4).

Anstelle des Kupferbehälters kann natürlich auch ein Eisenbehälter verwendet werden, dessen Innenwand aus Kupfer besteht. Unter Kupfer versteht man hierbei reines Kupfer und Kupfer mit den üblichen Verunreinigungen. Auch niedriglegierte Kupferlegierungen sind verwendbar.Instead of the copper container, an iron container can of course also be used, the inner wall of which is made of copper. Copper is understood to mean pure copper and copper with the usual impurities. Low-alloy copper alloys can also be used.

Während bei einem konventionellen Eisenbehälter das Borpulver bzw. -granulat nur zwei- bis dreimal wiederbenutzt werden kann, ist es bei Kupferbehälter oder kupferausgekleideten Tiegeln acht bis zehnmal weiterverwendbar. Bei gewöhnlichen Eisentiegeln müssen bei jedem Einsatz 20 bis 30 % neues Granulat zugesetzt werden, bei den erfindungsgemäßen nur nach jeweils 5 bis 6 Einsätzen 20 bis 30 % Granulat bzw. Pulver.While in a conventional iron container the boron powder or granulate can only be reused two to three times, it can be reused eight to ten times in copper containers or copper-lined crucibles. With ordinary iron crucibles, 20 to 30% new granules have to be added with each use, with the inventive ones only with 20 to 30% granules or powder after every 5 to 6 uses.

Weiterhin hat es sich in machen Fällen als vorteilhaft herausgestellt, die Borierung unter Schutzgas vorzunehmen, wie beispielsweise Stickstoff, Formiergas oder Argon.Furthermore, it has proven advantageous in some cases to carry out the boronization under protective gas, such as nitrogen, forming gas or argon.

Claims (4)

Behälter zum Borieren von Metallteilen mit Borierpulvern und Borierpulvergranulaten,
dadurch gekennzeichnet,
daß zumindest die Teile des Behälters (3) und des Tiegeldeckels (4), die mit dem Borierpulver bzw. dem Borierpulvergranulat (6) in Berührung kommen, aus Kupfer bestehen.Containers for boriding metal parts with boron powders and granules,
characterized,
that at least the parts of the container (3) and the crucible lid (4) which come into contact with the boron powder or the boron powder granulate (6) consist of copper. Behälter zum Borieren nach Anspruch 1,
dadurch gekennzeichnet,
daß der Behälter (3) und der Deckel (4) aus Eisen oder Eisenlegierungen bestehen und zumindest die Innenoberflächen, die mit dem Borierpulvergranulat (6) in Berührung kommen, eine Kupferschicht tragen.Boronizing container according to claim 1,
characterized,
that the container (3) and the lid (4) consist of iron or iron alloys and at least the inner surfaces which come into contact with the boron powder granulate (6) have a copper layer. Behälter zum Borieren nach Anspruch 1,
dadurch gekennzeichnet,
das Behälter (3) und der Deckel (4) aus Kupfer bestehen.Boronizing container according to claim 1,
characterized,
the container (3) and the lid (4) consist of copper. Behälter zum Borieren nach Anspruch 1, daß der Behälter (3) aus Kupfer besteht und in einen Außenbehälter (1) aus Eisen oder Eisenlegierung eingepasst ist.Boronizing container according to claim 1, that the container (3) consists of copper and is fitted into an outer container (1) made of iron or iron alloy.
EP94117833A 1993-12-27 1994-11-11 Container for boroniding metallic articles Expired - Lifetime EP0659900B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP34882293A JPH07188898A (en) 1993-12-27 1993-12-27 Solid boronizing method and container therefor
JP348822/93 1993-12-27

Publications (2)

Publication Number Publication Date
EP0659900A1 true EP0659900A1 (en) 1995-06-28
EP0659900B1 EP0659900B1 (en) 1997-03-12

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EP94117833A Expired - Lifetime EP0659900B1 (en) 1993-12-27 1994-11-11 Container for boroniding metallic articles

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EP (1) EP0659900B1 (en)
JP (1) JPH07188898A (en)
CZ (1) CZ327294A3 (en)
DE (1) DE59402058D1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104264104B (en) * 2014-09-29 2016-09-28 河海大学常州校区 A kind of method reducing micro-arc boronisation surface roughness

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1231094A (en) * 1959-03-27 1960-09-26 Soc Metallurgique Imphy Process for producing borided metal parts and parts obtained by this process
FR2099641A1 (en) * 1970-07-28 1972-03-17 Bopp Anton
US4011107A (en) * 1974-06-17 1977-03-08 Howmet Corporation Boron diffusion coating process
SU1629350A1 (en) * 1988-07-15 1991-02-23 Краматорский Научно-Исследовательский И Проектно-Технологический Институт Машиностроения Method of protecting cylindrical surfaces of steel parts during boriding treatment

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1231094A (en) * 1959-03-27 1960-09-26 Soc Metallurgique Imphy Process for producing borided metal parts and parts obtained by this process
FR2099641A1 (en) * 1970-07-28 1972-03-17 Bopp Anton
US4011107A (en) * 1974-06-17 1977-03-08 Howmet Corporation Boron diffusion coating process
SU1629350A1 (en) * 1988-07-15 1991-02-23 Краматорский Научно-Исследовательский И Проектно-Технологический Институт Машиностроения Method of protecting cylindrical surfaces of steel parts during boriding treatment

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, vol. 102, no. 2, 14 January 1985, Columbus, Ohio, US; abstract no. 10697w, SUZUKI MOTOR: "aluminizing and boronizing" page 252; column 102; *
DATABASE WPI Derwent World Patents Index; AN 91-316656, BELETSKII V V: "steel articles cylindrical surfaces protection during borating" *
J. SUBRAHMANYAM: "studies on boronising of mild steel", MATERIALS LETTERS, vol. 1, no. 3/4, December 1982 (1982-12-01), AMSTERDAM,NL, pages 100 - 103, XP024150158, DOI: doi:10.1016/0167-577X(82)90018-0 *
M CARBUCICCHIO: "influence of chromium on boride coatings produced on iron alloys", THIN SOLID FILMS, vol. 126, no. 3/4, April 1985 (1985-04-01), LAUSANNE,CH, pages 299 - 305, XP025775529, DOI: doi:10.1016/0040-6090(85)90324-4 *

Also Published As

Publication number Publication date
JPH07188898A (en) 1995-07-25
DE59402058D1 (en) 1997-04-17
EP0659900B1 (en) 1997-03-12
CZ327294A3 (en) 1996-01-17

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