EP2191921A2 - Procédé de production d'un élément de cuivre et chrome de contact pour des ensembles d'appareil de commutation à moyenne tension, et élément de contact - Google Patents
Procédé de production d'un élément de cuivre et chrome de contact pour des ensembles d'appareil de commutation à moyenne tension, et élément de contact Download PDFInfo
- Publication number
- EP2191921A2 EP2191921A2 EP08020271A EP08020271A EP2191921A2 EP 2191921 A2 EP2191921 A2 EP 2191921A2 EP 08020271 A EP08020271 A EP 08020271A EP 08020271 A EP08020271 A EP 08020271A EP 2191921 A2 EP2191921 A2 EP 2191921A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- chromium
- contact element
- copper
- particles
- rounded
- 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
Links
Images
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.
- 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.
- 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 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)
Priority Applications (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 |
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 |
Applications Claiming Priority (1)
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 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2191921A2 true EP2191921A2 (fr) | 2010-06-02 |
EP2191921A3 EP2191921A3 (fr) | 2011-05-04 |
EP2191921B1 EP2191921B1 (fr) | 2013-01-09 |
Family
ID=40823018
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08020271A Not-in-force 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 |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2191921B1 (fr) |
WO (1) | WO2010057619A2 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106312055A (zh) * | 2016-08-31 | 2017-01-11 | 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 |
Families Citing this family (1)
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 |
Citations (6)
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 |
EP0469578A2 (fr) * | 1990-08-02 | 1992-02-05 | Kabushiki Kaisha Meidensha | Matériau de contact électrique |
EP0538896A2 (fr) * | 1991-10-25 | 1993-04-28 | Kabushiki Kaisha Meidensha | Procédé de préparation de matériau de contact |
US5689796A (en) * | 1995-07-18 | 1997-11-18 | Citizen Watch Co., Ltd. | Method of manufacturing molded copper-chromium family metal alloy article |
US5853083A (en) * | 1995-12-28 | 1998-12-29 | Fuji Electric Co., Ltd. | Contact material for a vacuum circuit breaker and a method for manufacturing the same |
-
2008
- 2008-11-21 EP EP08020271A patent/EP2191921B1/fr not_active Not-in-force
-
2009
- 2009-11-18 WO PCT/EP2009/008194 patent/WO2010057619A2/fr active Application Filing
Patent Citations (6)
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 |
EP0469578A2 (fr) * | 1990-08-02 | 1992-02-05 | Kabushiki Kaisha Meidensha | Matériau de contact électrique |
EP0538896A2 (fr) * | 1991-10-25 | 1993-04-28 | Kabushiki Kaisha Meidensha | Procédé de préparation de matériau de contact |
US5689796A (en) * | 1995-07-18 | 1997-11-18 | Citizen Watch Co., Ltd. | Method of manufacturing molded copper-chromium family metal alloy article |
US5853083A (en) * | 1995-12-28 | 1998-12-29 | Fuji Electric Co., Ltd. | Contact material for a vacuum circuit breaker and a method for manufacturing the same |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106312055A (zh) * | 2016-08-31 | 2017-01-11 | 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 |
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 |
Also Published As
Publication number | Publication date |
---|---|
WO2010057619A3 (fr) | 2011-09-22 |
WO2010057619A2 (fr) | 2010-05-27 |
EP2191921B1 (fr) | 2013-01-09 |
EP2191921A3 (fr) | 2011-05-04 |
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