WO2010057619A2 - Procédé de production d'un élément de contact pour appareillages de commutation moyenne tension, et élément de contact lui-même - Google Patents

Procédé de production d'un élément de contact pour appareillages de commutation moyenne tension, et élément de contact lui-même Download PDF

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Publication number
WO2010057619A2
WO2010057619A2 PCT/EP2009/008194 EP2009008194W WO2010057619A2 WO 2010057619 A2 WO2010057619 A2 WO 2010057619A2 EP 2009008194 W EP2009008194 W EP 2009008194W WO 2010057619 A2 WO2010057619 A2 WO 2010057619A2
Authority
WO
WIPO (PCT)
Prior art keywords
chromium
contact element
particles
rounded
powder
Prior art date
Application number
PCT/EP2009/008194
Other languages
English (en)
Other versions
WO2010057619A3 (fr
Inventor
Dietmar Gentsch
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
Publication of WO2010057619A2 publication Critical patent/WO2010057619A2/fr
Publication of WO2010057619A3 publication Critical patent/WO2010057619A3/fr

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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 claims 1 and 6.
  • 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. Even after a few pressing operations, this damage to the pressing tool leads to intolerable deviations in the final dimensions of the green compact and in the surface quality thereof.
  • 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.
  • a first option is for the chromium particles to be 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 chromium particles or the already mechanically rounded chromium particles are provided with a copper layer.
  • the chromium particles are alternately coated with copper particles in an inert crucible or a vacuum container and are then heat-treated such that the chromium particles are covered with a copper layer, and the powder which has been only loosely sintered is then ground again, and only then pressed and sintered with near final dimensions in the form of a green compact.
  • 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.
  • a further alternative is to mechanically round the chromium particles in, for example, a ball mill.
  • the chromium particles can also additionally be 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 can take 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.
  • two alternative procedures can be used.
  • the original shape of the chromium particle 1 has sharp edges and is therefore firstly rounded in a mill. It is then coated with copper, as described above.
  • the edged chromium particle 1 is rounded by a correspondingly thick copper layer 2 merely by means of the coating.
  • the milling operation in the mill may also be used in this case.

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)

Abstract

L'invention porte sur un procédé de production d'un élément de contact pour appareillages de commutation moyenne tension, et également sur l'élément de contact lui-même, selon le préambule des revendications 1 et 6. De façon, dans ce cas, à réduire considérablement l'effet abrasif qui apparaît durant un fonctionnement lorsque l'élément de contact est fini, et donc à rendre l'élément de contact plus durable, l'invention propose que les particules de chrome dans le mélange pulvérulent soient arrondies en surface à l'avance ; se référer à la figure à cet égard.
PCT/EP2009/008194 2008-11-21 2009-11-18 Procédé de production d'un élément de contact pour appareillages de commutation moyenne tension, et élément de contact lui-même WO2010057619A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP08020271A EP2191921B1 (fr) 2008-11-21 2008-11-21 Procédé de production d'un élément de cuivre et chrome de contact pour des ensembles d'appareil de commutation à moyenne tension
EP08020271.6 2008-11-21

Publications (2)

Publication Number Publication Date
WO2010057619A2 true WO2010057619A2 (fr) 2010-05-27
WO2010057619A3 WO2010057619A3 (fr) 2011-09-22

Family

ID=40823018

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/008194 WO2010057619A2 (fr) 2008-11-21 2009-11-18 Procédé de production d'un élément de contact pour appareillages de commutation moyenne tension, et élément de contact lui-même

Country Status (2)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103878366A (zh) * 2014-04-16 2014-06-25 湖南大学 铜包覆铬复合粉末及其制备方法和应用

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (3)

* 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
US5689796A (en) * 1995-07-18 1997-11-18 Citizen Watch Co., Ltd. Method of manufacturing molded copper-chromium family metal alloy article

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US5352404A (en) * 1991-10-25 1994-10-04 Kabushiki Kaisha Meidensha Process for forming contact material including the step of preparing chromium with an oxygen content substantially reduced to less than 0.1 wt. %
DE19629907A1 (de) * 1995-12-28 1997-07-03 Fuji Electric Co Ltd Kontaktmaterial für Vakuum-Leistungsschalter und Verfahren zu dessen Herstellung

Patent Citations (3)

* 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
US5689796A (en) * 1995-07-18 1997-11-18 Citizen Watch Co., Ltd. Method of manufacturing molded copper-chromium family metal alloy article

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103878366A (zh) * 2014-04-16 2014-06-25 湖南大学 铜包覆铬复合粉末及其制备方法和应用

Also Published As

Publication number Publication date
WO2010057619A3 (fr) 2011-09-22
EP2191921B1 (fr) 2013-01-09
EP2191921A2 (fr) 2010-06-02
EP2191921A3 (fr) 2011-05-04

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