EP2191921B1 - Verfahren zur Herstellung eines Kupfer-Chrom Kontaktelements für Schaltgetriebeanordnungen mittlerer Spannung - Google Patents

Verfahren zur Herstellung eines Kupfer-Chrom Kontaktelements für Schaltgetriebeanordnungen mittlerer Spannung Download PDF

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Publication number
EP2191921B1
EP2191921B1 EP08020271A EP08020271A EP2191921B1 EP 2191921 B1 EP2191921 B1 EP 2191921B1 EP 08020271 A EP08020271 A EP 08020271A EP 08020271 A EP08020271 A EP 08020271A EP 2191921 B1 EP2191921 B1 EP 2191921B1
Authority
EP
European Patent Office
Prior art keywords
copper
chromium
powder
rounded
contact element
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.)
Not-in-force
Application number
EP08020271A
Other languages
English (en)
French (fr)
Other versions
EP2191921A3 (de
EP2191921A2 (de
Inventor
Dietmar Dr.-Ing. Gentsch
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 Technology AG
Original Assignee
ABB Technology AG
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 ABB Technology AG filed Critical ABB Technology AG
Priority to EP08020271A priority Critical patent/EP2191921B1/de
Priority to PCT/EP2009/008194 priority patent/WO2010057619A2/en
Publication of EP2191921A2 publication Critical patent/EP2191921A2/de
Publication of EP2191921A3 publication Critical patent/EP2191921A3/de
Application granted granted Critical
Publication of EP2191921B1 publication Critical patent/EP2191921B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H01H1/0203—Contacts characterised by the material thereof specially adapted for vacuum switches
    • H01H1/0206—Contacts characterised by the material thereof specially adapted for vacuum switches containing as major components Cu and Cr
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/06—Metallic powder characterised by the shape of the particles
    • B22F1/065—Spherical particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/17—Metallic particles coated with metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps

Definitions

  • the invention relates to a process for producing a contact element for medium-voltage switchgear assemblies, and also to the contact element itself, in accordance with the preamble of claim 1.
  • Contact elements for medium-voltage switchgear assemblies are often produced by means of sintering processes.
  • sintering processes not only copper but also an alloy of copper and chromium is used for increasing the resistance to erosion.
  • the sintering processes it is known to press what are known as green compacts with near final dimensions in advance, and these green compacts are then annealed. Very large pressing forces are used during the pressing of the green compacts.
  • the powder consisting of copper and chromium particles is placed in a mold and the pressing tool then compresses said particles with a high pressing force. It has been observed in this process that the extremely hard particles of the chromium powder have a considerable abrasive effect on the surface of the pressing tool.
  • DD-209 317 discloses to produce contact elements for switches out of copper and copper-chromium powder in which the particles are rounded by milling.
  • the invention is therefore based on the object of improving a process for producing a contact element for medium-voltage switchgear assemblies, and also a contact element itself, in such a way as to considerably lessen the abrasive effect which occurs during operation when the contact element is finished, and therefore to make the contact element more durable during operation.
  • the essence of the invention in this case is that the chromium particles in the powder mixture are surface-rounded in advance. This considerably reduces the mechanically abrasive effect on the expensive pressing tool. In this case, however, the outer surface of the hard chromium particles can be rounded in different ways.
  • the chromium particles are rounded mechanically in a mill, in particular in a ball mill.
  • the chromium powder rounded in this way is then used, for its part, for the copper/chrominum powder mixture required for production.
  • the already mechanically rounded chromium particles are provided with a copper layer.
  • this further copper coating is a further measure for the chromium particles which have already been mechanically rounded in advance.
  • heating is of course carried out up to that temperature at which the copper covers the chromium particles.
  • the process is carried out under vacuum, under a hydrogen atmosphere or under inert gas. Further oxidation processes are avoided in the process.
  • the essence of the invention is that the chromium particles in the powder mixture have a surface-rounded structure before the pressing operation. This allows a low-abrasion, direct pressing operation with near final dimensions to be carried out using the pressing tool.
  • the structure is provided mechanically by breaking the edges in a mill, and/or the chromium powder or the chromium powder particles mechanically rounded in this way is/are rounded by vaporizing with copper. This results in a homogeneous, high-quality green compact, in the case of which the pressing tool can operate with considerably less abrasion.
  • the figure therefore merely shows an example of the microstructure of chromium powder particles as are used for this process.
  • a first illustration shows a chromium particle which has sharp edges per se.
  • this particle is provided with a copper layer in the manner described, and the surface of the resulting copper-coated chromium particle is therefore rounded in this way.
  • the chromium particles are mechanically rounded in, for example, a ball mill.
  • the chromium particles are additionally coated with copper. This then no longer only has the purpose of rounding, but also producing a copper/chromium alloy which is homogeneous as a result.
  • the coating operation takes place by means of vaporizing, or by layering copper and chromium powder without preceding mechanical pressure, and thermal tempering to a temperature at which copper powder melts or vaporizes and therefore coats the chromium powder.
  • the powder obtained is then the starting material for filling a pressing mold and for the production of a green compact.
  • the figure therefore firstly shows the edged chromium particle 1.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Nanotechnology (AREA)
  • Powder Metallurgy (AREA)
  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
  • Contacts (AREA)

Claims (2)

  1. Prozess zum Herstellen eines Kontaktelements für eine Mittelspannungs-Schaltanlagenbaugruppe, wobei ein grüner Kompaktkörper hergestellt wird, indem ein aus einem Kupfer-Chrom-Gemisch bestehendes Pulver gepresst wird, das anschließend gesintert wird,
    wobei die Chrompartikel in dem Pulvergemisch zuvor oberflächengerundet werden, indem sie mechanisch in einer Mühle, insbesondere einer Kugelmühle, gerundet werden, und die bereits mechanisch gerundeten Chrompartikel mit einer Kupferschicht überzogen werden, und der Beschichtungsvorgang mittels Aufdampfen oder durch Aufschichten von Kupfer- und Chrompulver ohne vorausgehenden mechanischen Druck und durch thermisches Tempern auf eine Temperatur, bei der Kupferpulver schmilzt oder verdampft und dadurch das Chrompulver beschichtet, ausgeführt wird.
  2. Prozess nach Anspruch 1, wobei der Prozess unter Vakuum, unter einer Wasserstoffatmosphäre oder unter Inertgas ausgeführt wird.
EP08020271A 2008-11-21 2008-11-21 Verfahren zur Herstellung eines Kupfer-Chrom Kontaktelements für Schaltgetriebeanordnungen mittlerer Spannung Not-in-force EP2191921B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP08020271A EP2191921B1 (de) 2008-11-21 2008-11-21 Verfahren zur Herstellung eines Kupfer-Chrom Kontaktelements für Schaltgetriebeanordnungen mittlerer Spannung
PCT/EP2009/008194 WO2010057619A2 (en) 2008-11-21 2009-11-18 Process for producing a contact element for medium-voltage switchgear assemblies, and also contact element itself

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08020271A EP2191921B1 (de) 2008-11-21 2008-11-21 Verfahren zur Herstellung eines Kupfer-Chrom Kontaktelements für Schaltgetriebeanordnungen mittlerer Spannung

Publications (3)

Publication Number Publication Date
EP2191921A2 EP2191921A2 (de) 2010-06-02
EP2191921A3 EP2191921A3 (de) 2011-05-04
EP2191921B1 true EP2191921B1 (de) 2013-01-09

Family

ID=40823018

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08020271A Not-in-force EP2191921B1 (de) 2008-11-21 2008-11-21 Verfahren zur Herstellung eines Kupfer-Chrom Kontaktelements für Schaltgetriebeanordnungen mittlerer Spannung

Country Status (2)

Country Link
EP (1) EP2191921B1 (de)
WO (1) WO2010057619A2 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103878366B (zh) * 2014-04-16 2016-07-06 湖南大学 铜包覆铬复合粉末及其制备方法和应用
CN106312055B (zh) * 2016-08-31 2018-06-05 陕西斯瑞新材料股份有限公司 铜包铬合金粉及其铜铬触头制备方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3785801A (en) * 1968-03-01 1974-01-15 Int Nickel Co Consolidated composite materials by powder metallurgy
DD209317A1 (de) * 1982-09-02 1984-04-25 Bernd Deja Kontaktwerkstoff fuer vakuumschalter und verfahren zur herstellung
JP2705998B2 (ja) * 1990-08-02 1998-01-28 株式会社明電舎 電気接点材料の製造方法
EP0538896A3 (en) * 1991-10-25 1993-11-18 Meidensha Electric Mfg Co Ltd Process for forming contact material
US5689796A (en) * 1995-07-18 1997-11-18 Citizen Watch Co., Ltd. Method of manufacturing molded copper-chromium family metal alloy article
DE19629907A1 (de) * 1995-12-28 1997-07-03 Fuji Electric Co Ltd Kontaktmaterial für Vakuum-Leistungsschalter und Verfahren zu dessen Herstellung

Also Published As

Publication number Publication date
EP2191921A3 (de) 2011-05-04
EP2191921A2 (de) 2010-06-02
WO2010057619A3 (en) 2011-09-22
WO2010057619A2 (en) 2010-05-27

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