EP0144846A2 - Pièce moulée et frittée pour pièces de contact pour interrupteurs à vide et méthode de sa fabrication - Google Patents

Pièce moulée et frittée pour pièces de contact pour interrupteurs à vide et méthode de sa fabrication Download PDF

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Publication number
EP0144846A2
EP0144846A2 EP84113919A EP84113919A EP0144846A2 EP 0144846 A2 EP0144846 A2 EP 0144846A2 EP 84113919 A EP84113919 A EP 84113919A EP 84113919 A EP84113919 A EP 84113919A EP 0144846 A2 EP0144846 A2 EP 0144846A2
Authority
EP
European Patent Office
Prior art keywords
temperature
impregnation
melting
matrix
sintering
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
EP84113919A
Other languages
German (de)
English (en)
Other versions
EP0144846A3 (en
EP0144846B1 (fr
Inventor
Ilgmar Dr.-Ing. Kalning
Hans-Peter Dipl.-Ing. Bahder
Bernd Dipl.-Ing. Deja
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.)
VEB "Otto Buchwitz" Starkstrom-Anlagenbau Dresden
Original Assignee
VEB "Otto Buchwitz" Starkstrom-Anlagenbau Dresden
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 VEB "Otto Buchwitz" Starkstrom-Anlagenbau Dresden filed Critical VEB "Otto Buchwitz" Starkstrom-Anlagenbau Dresden
Priority to AT84113919T priority Critical patent/ATE34873T1/de
Publication of EP0144846A2 publication Critical patent/EP0144846A2/fr
Publication of EP0144846A3 publication Critical patent/EP0144846A3/de
Application granted granted Critical
Publication of EP0144846B1 publication Critical patent/EP0144846B1/fr
Expired legal-status Critical Current

Links

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

Definitions

  • the invention relates to molded sintered bodies for vacuum switch contacts and to a method for their production, in which the sintered material is first produced from a metal powder which forms the matrix and has a high melting point by mixing, pressing and sintering and then impregnating the matrix with an impregnating material having a lower melting point.
  • Such switch contacts are particularly suitable for vacuum switches in medium-voltage networks with high breaking capacities.
  • a method for producing contacts for vacuum switches or vacuum spark gaps is already known, in which a skeleton body is produced by pressing and sintering a high-melting metal powder, on the surface of which a plate made of an impregnating material with a lower melting point is then placed, whereupon this unit is under vacuum held at a temperature below the melting temperature of the first melting metal until the traces of oxygen are removed from the surface of the metals. The temperature is then increased to the melting temperature of the metal with the lower melting temperature, the pores being filled with the impregnating material.
  • the skeleton body consists of chrome, the impregnation material made of copper, silver or a copper alloy that contains ⁇ 0.3% zirconium, tantalum or titanium (DE-A1 2521 504).
  • the invention is based on the object of specifying shaped sintered bodies for vacuum switch contacts and a method for their production, the above disadvantages not occurring and switch contact pieces of high conductivity being obtainable by a simpler procedure in which a dissolution of the high-melting matrix material in the lower-melting impregnating material is prevented.
  • the molded bodies placed in pairs are placed in a vacuum oven and, after evacuation, sintered to a pressure of 10-2 Pa at 1050 ° C. for 2 h to form a liquid phase caused by the low-melting eutectic Cu-B with simultaneous degassing.
  • a metallurgical reaction leads to the formation of chromium boride.
  • the temperature is then raised to 1150 ° C. and kept at this value for 1 h.
  • the pad melts and penetrates as the degassing continues into the sintered body.
  • the vacuum oven is then cooled to 900 ° C. and kept at this temperature for 2 hours.
  • the boron is separated from the eutectic alloy Cu-B in the form of a finely dispersed structural component.
  • the proportion of dissolved chromium which is severely restricted by the chromium boride formed is likewise finely dispersed from the impregnating alloy, so that the highly conductive copper is available without restriction in the contact for the power line.
  • the remaining amount of the impregnation material used which is at least equivalent to the determined pore volume, can be placed on the compact in the form of a compact plate.
  • the sintering process is carried out at a temperature which is below the melting temperature of the impregnation material, but at least at a temperature at which the filler material and the impregnation material form a eutectic.
  • a degassing of the sintered body takes place simultaneously under the action of vacuum at a pressure ⁇ 10 2 Pa.
  • a sinter-promoting effect is also achieved by the formation of a liquid phase.
  • the reduced surface tension of the impregnation material due to the filler material causes it to be sucked into fine pores and the subsequent impregnation to be influenced positively.
  • the filler material undergoes a metallurgical reaction with the higher-melting matrix material, a coherent, coherent surface layer surrounding the matrix material, which in turn leads to solutions gears between the matrix material and the impregnating material flowing in during the subsequent impregnation process are inhibited.
  • the temperature is increased to at least the melting temperature of the impregnation material and the specified time is kept at this temperature, as a result of which the pores are filled to a residual pore content of 1 l with simultaneous further degassing of the sintered body.
  • the filler material made of the eutectic alloy and the possibly small proportion of dissolved matrix material are finely dispersed due to the decreasing solubility in the impregnating material as the temperature decreases. These excretions cause embrittlement of the phase boundary between matrix material and impregnation material and thus inhibit the tendency to weld.

Landscapes

  • Powder Metallurgy (AREA)
  • Manufacture Of Switches (AREA)
EP84113919A 1983-12-12 1984-11-16 Pièce moulée et frittée pour pièces de contact pour interrupteurs à vide et méthode de sa fabrication Expired EP0144846B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84113919T ATE34873T1 (de) 1983-12-12 1984-11-16 Sinterformkoerper fuer vakuumschalterkontaktstuecke und verfahren zu ihrer herstellung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DD257796 1983-12-12
DD83257796A DD219619A1 (de) 1983-12-12 1983-12-12 Verfahren zur herstellung von sinterwerkstoffen fuer vakuumschalterkontaktstuecke

Publications (3)

Publication Number Publication Date
EP0144846A2 true EP0144846A2 (fr) 1985-06-19
EP0144846A3 EP0144846A3 (en) 1986-01-02
EP0144846B1 EP0144846B1 (fr) 1988-06-01

Family

ID=5552815

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84113919A Expired EP0144846B1 (fr) 1983-12-12 1984-11-16 Pièce moulée et frittée pour pièces de contact pour interrupteurs à vide et méthode de sa fabrication

Country Status (5)

Country Link
EP (1) EP0144846B1 (fr)
JP (1) JPS60149702A (fr)
AT (1) ATE34873T1 (fr)
DD (1) DD219619A1 (fr)
DE (1) DE3471806D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU598815B2 (en) * 1986-06-25 1990-07-05 Westinghouse Electric Corporation Circuit breaker contact containing silver and graphite fibers
DE19537657A1 (de) * 1995-10-10 1997-04-17 Abb Patent Gmbh Verfahren und Vorrichtung zur Herstellung eines Kontaktstückes
US6524525B2 (en) 2000-03-04 2003-02-25 Metalor Technologies International Sa Method for producing a contact material for contact pieces for vacuum switch devices, and a contact material and contact pieces therefor

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2632886B2 (ja) * 1987-12-22 1997-07-23 川崎製鉄株式会社 複相組織焼結体の製造方法
DE19933111A1 (de) * 1999-07-15 2001-01-18 Abb Patent Gmbh Vakuumkammer und Verfahren zur Herstellung der Vakuumkammer
DE19960876A1 (de) * 1999-12-17 2001-06-21 Abb Patent Gmbh Verfahren zur Herstellung eines Kontaktstückrohlings und eines Kontaktstückes sowie ein Kontaktstückrohling, ein Kontaktstück und eine Kontaktstückanordnung für Axialmagnetfeldanwendungen in einer Vakuumkammer

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2310317A1 (de) * 1973-03-01 1974-09-05 Siemens Ag Mehrbereichskontakt fuer vakuumschaltroehren
DE2521504A1 (de) * 1974-05-23 1975-12-04 English Electric Co Ltd Verfahren zur herstellung einer elektrode fuer vakuumschalter oder vakuumfunkenstrecken
DE2522832A1 (de) * 1974-06-03 1975-12-18 Westinghouse Electric Corp Verfahren zur herstellung von chrom- kupfer-kontakten fuer vakuumschalter und nach diesem verfahren hergestellte kontakte
DE2914186A1 (de) * 1978-04-13 1979-10-31 Westinghouse Electric Corp Verfahren zur herstellung von elektrischen kontakten fuer vakuum- trennschalter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2310317A1 (de) * 1973-03-01 1974-09-05 Siemens Ag Mehrbereichskontakt fuer vakuumschaltroehren
DE2521504A1 (de) * 1974-05-23 1975-12-04 English Electric Co Ltd Verfahren zur herstellung einer elektrode fuer vakuumschalter oder vakuumfunkenstrecken
DE2522832A1 (de) * 1974-06-03 1975-12-18 Westinghouse Electric Corp Verfahren zur herstellung von chrom- kupfer-kontakten fuer vakuumschalter und nach diesem verfahren hergestellte kontakte
DE2914186A1 (de) * 1978-04-13 1979-10-31 Westinghouse Electric Corp Verfahren zur herstellung von elektrischen kontakten fuer vakuum- trennschalter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MONOGRAPHIE M.HANSEN, CONSTITUTION OF BINARY ALLOYS, 2nd Edition, Mc.Graw-Hill Book Company,Inc. 1958 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU598815B2 (en) * 1986-06-25 1990-07-05 Westinghouse Electric Corporation Circuit breaker contact containing silver and graphite fibers
DE19537657A1 (de) * 1995-10-10 1997-04-17 Abb Patent Gmbh Verfahren und Vorrichtung zur Herstellung eines Kontaktstückes
US6524525B2 (en) 2000-03-04 2003-02-25 Metalor Technologies International Sa Method for producing a contact material for contact pieces for vacuum switch devices, and a contact material and contact pieces therefor

Also Published As

Publication number Publication date
ATE34873T1 (de) 1988-06-15
EP0144846A3 (en) 1986-01-02
JPS60149702A (ja) 1985-08-07
DD219619A1 (de) 1985-03-06
EP0144846B1 (fr) 1988-06-01
DE3471806D1 (en) 1988-07-07

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