EP1535292A1 - Plot de contact en tungstene pourvu d'une couche anticorrosive en metal commun - Google Patents

Plot de contact en tungstene pourvu d'une couche anticorrosive en metal commun

Info

Publication number
EP1535292A1
EP1535292A1 EP04728163A EP04728163A EP1535292A1 EP 1535292 A1 EP1535292 A1 EP 1535292A1 EP 04728163 A EP04728163 A EP 04728163A EP 04728163 A EP04728163 A EP 04728163A EP 1535292 A1 EP1535292 A1 EP 1535292A1
Authority
EP
European Patent Office
Prior art keywords
tungsten
contact piece
layer
contact
corrosion
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
EP04728163A
Other languages
German (de)
English (en)
Other versions
EP1535292B1 (fr
Inventor
Gerhard Renner
Udo Siefken
Martin Müller
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.)
Renner Louis GmbH
FER Fahrzeugelektrik GmbH
Original Assignee
Renner Louis GmbH
FER Fahrzeugelektrik GmbH
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 Renner Louis GmbH, FER Fahrzeugelektrik GmbH filed Critical Renner Louis GmbH
Priority to PL04728163T priority Critical patent/PL1535292T3/pl
Publication of EP1535292A1 publication Critical patent/EP1535292A1/fr
Application granted granted Critical
Publication of EP1535292B1 publication Critical patent/EP1535292B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49105—Switch making

Definitions

  • Tungsten as a contact support in electromechanical switchgear is the metal of choice for all its high-melting-point metals due to its extraordinary resistance to erosion when it comes to fast switching sequences combined with considerable sparking.
  • the contact piece is usually soldered as a rivet with a tungsten disk as a contact support on a rivet-shaped carrier made of soft iron or copper (see Fig.1).
  • Tungsten is not a precious metal. When switching in air, oxide layers are to be expected. Corrosion phenomena on tungsten contact pieces have been known as a problem for over 50 years and, under unfavorable switching conditions, impair the universal field of application of tungsten as a contact material. In dry air, even in a hot environment (desert climate), the tungsten contact remains unaffected and fully functional for a long time. But if moisture is added (tropical climate), rapid corrosion of the unprotected tungsten occurs.
  • Keil, A . Meyer
  • C.L Corrosion phenomena at breaker contacts. Electropost 7 (1954) 93-95.
  • Tungsten contact pairings are more prone to failure in hot and humid climates. This can be observed in a statistically conspicuous manner with horn contacts, for example, if a certain number of cars is produced on stockpile before the start of sales of a new vehicle type, there may be months under warm and humid conditions before they arrive via the dealer for delivery.
  • a method well known to those skilled in the art is the coating of the complete Kunststoffnietes before installation in the switching device with a thin nickel layer. Due to the passivation of the nickel, the contact with the undamaged nickel layer remains uncoated for a long time and remains free of corrosion layers. However, the Ni-layer is partially destroyed by the necessary honking of the new horn at the switching surface at the horn manufacturer. The protective effect of the Ni layer is greatly reduced. In the field trial a positive effect of a nickel plating is no longer clear to prove. Another way is via the carburization of the tungsten switching surface. It forms a tungsten carbide-containing, some microns thick hard layer. Undoubtedly, such a hard layer exhibits improved corrosion resistance.
  • Japanese Patent Publication 20128/1974 discloses the use of graphite powder as a carburizing agent.
  • German Offenlegungsschrift 3232097 A1 discloses the use of propane as a carburizing agent in a protective gas furnace. An impairment of the solder side of the tungsten contact pad by simultaneous unwanted carburizing and impairment of OfenMapleiter is not excluded.
  • the invention is thus based on the object of developing a contact piece consisting of a tungsten pad soldered to a metallic carrier with Cu or Ag brazing alloy which exhibits no impairment of the switching properties under corrosive conditions, especially under the influence of a moist, warm climate.
  • This object has been achieved on the basis of the surprising finding that the corrosion resistance of the tungsten coating can be considerably improved by covering the solder layer and the carrier with a thin base metal layer.
  • the invention thus relates to a contact piece with Wolf ramauf läge (1), which is coated on solder (2) and support (3) with a thin layer (4) of a base metal.
  • Preferred embodiments of the rivet are the subject matter of claims 2 to 5.
  • a method for producing the contact piece is described in claims 6 to 9.
  • Suitable base metals in accordance with the invention are those metals which, under operating conditions in the electrochemical series, are more negative than tungsten.
  • Preferred examples are tin, zinc, magnesium and aluminum, with tin (Sn) being particularly preferred.
  • Tin is only slightly different in the voltage series to tungsten.
  • tin has proven to be particularly suitable in practice. It should be emphasized in a galvanic deposition of S ⁇ that this is a very cost-effective process with an aesthetically pleasing result.
  • An advantage of the inventive solution is that in the switching contact the burning material tungsten is free of any protective / foreign layer and thus it can not be destroyed by sparking can be expected with other disturbing influences during switching.
  • the effect of the non-noble metal layer does not happen through a physical coverage of the tungsten to be protected, but solely by electrochemical means.
  • more noble elements such as copper (as a Cu solder) or Ag (as an electrolytic covering) form a local element with W
  • the tungsten of the W contact layer preferably goes into solution as a so-called sacrificial anode.
  • Ag as a protective layer is counterproductive and copper as an adjacent solder layer is even conducive to corrosion. The same is to be assumed for the potential shift that is cathodic, that is, more noble behaving Ni.
  • a contact piece for use as a horn and relay contact, consisting of a tungsten contact support (1), soldered with Cu or Ag brazing alloy (2) on a metallic support (3), according to the invention covered with a non-noble metal layer ( 4).
  • Fig. 3 A contact pad of W of a rivet, according to the prior art as a reference before the corrosion test.
  • Fig. 4 a contact pad of W of a rivet according to the prior art after the corrosion test.
  • FIGS. 2 and 4 The result after 48h is shown in FIGS. 2 and 4.
  • the galvanically treated rivets show in comparison to the non-corroded standard ( Figure 3) only slight tarnish on the contact surface.
  • the W surface is covered with thick greenish-brown crusts, which extend from the circumference on the Cu solder into the tungsten surface, partly up to the middle. These crusts are believed to be inorganic salts of copper and tungsten. If these are between the closed contacts of a horn, this leads to an increase of the contact resistance and consequently to the failure of the horn.
  • Example 1 Instead of Sn, Zn is used as an additional galvanic layer.
  • the comparison against an untreated standard is similar to that of Example 1.
  • the disadvantage here is a bluish tarnishing of the galvanized carrier after corrosion. The rivets are unsightly.

Landscapes

  • Contacts (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
  • Details Of Resistors (AREA)
EP04728163A 2003-04-22 2004-04-19 Plot de contact en tungstene pourvu d'une couche anticorrosive en etain Expired - Lifetime EP1535292B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL04728163T PL1535292T3 (pl) 2003-04-22 2004-04-19 Element stykowy z wolframu z powstrzymującą korozję warstwą cyny

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10318223 2003-04-22
DE10318223A DE10318223A1 (de) 2003-04-22 2003-04-22 Kontaktstück aus Wolfram mit einer korrosionshemmenden Schicht aus Unedelmetall
PCT/EP2004/004153 WO2004095485A1 (fr) 2003-04-22 2004-04-19 Plot de contact en tungstene pourvu d'une couche anticorrosive en metal commun

Publications (2)

Publication Number Publication Date
EP1535292A1 true EP1535292A1 (fr) 2005-06-01
EP1535292B1 EP1535292B1 (fr) 2005-11-30

Family

ID=33304876

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04728163A Expired - Lifetime EP1535292B1 (fr) 2003-04-22 2004-04-19 Plot de contact en tungstene pourvu d'une couche anticorrosive en etain

Country Status (11)

Country Link
US (1) US7339127B2 (fr)
EP (1) EP1535292B1 (fr)
JP (1) JP2007535092A (fr)
KR (1) KR20060018215A (fr)
CN (1) CN1777966A (fr)
AT (1) ATE311657T1 (fr)
BR (1) BRPI0409636A (fr)
DE (2) DE10318223A1 (fr)
ES (1) ES2253731T3 (fr)
PL (1) PL1535292T3 (fr)
WO (1) WO2004095485A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4545760B2 (ja) * 2004-12-15 2010-09-15 富士通セミコンダクター株式会社 接触子部材、コンタクタ及び接触方法
DE102005024973A1 (de) * 2005-05-25 2006-11-30 Siemens Ag Schaltstück, Niederspannungs-Leistungsschalter mit einem Schaltstück sowie Verfahren zur Herstellung eines Schaltstücks
JP5274046B2 (ja) * 2008-02-21 2013-08-28 三洋電機株式会社 車両用の電源装置
DE102008060971B3 (de) * 2008-12-06 2010-07-08 Ami Doduco Gmbh Kontaktteil für Hochspannungsschalter
FR2997222B1 (fr) 2012-10-19 2015-01-16 Alstom Technology Ltd Dispositif d'etablissement et/ou de coupure de courant a contacts permanents a usure reduite
JP5992625B2 (ja) * 2013-08-06 2016-09-14 株式会社徳力本店 接触子
KR20180087661A (ko) 2017-01-25 2018-08-02 삼성전자주식회사 핵형성 구조물을 갖는 도전성 구조물을 포함하는 반도체 소자 및 그 형성 방법

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1264685A (en) * 1916-09-30 1918-04-30 Giuseppe Alberto Rignon Method of making electrical contacts.
US2216654A (en) * 1937-07-27 1940-10-01 Arrow Hart & Hegeman Electric Electric switch contact
US2547947A (en) * 1946-06-17 1951-04-10 Fansteel Metallurgical Corp Contact assembly
US3519543A (en) * 1967-10-27 1970-07-07 Talon Inc Process for electrolytically cleaning and polishing electrical contacts
US3697389A (en) * 1968-01-02 1972-10-10 Amp Inc Method of forming electrical contact materials
US3852879A (en) * 1968-09-25 1974-12-10 Mallory & Co Inc P R Electrical contact material
US3569653A (en) * 1969-01-31 1971-03-09 Engelhard Min & Chem Electrical contact and contact assembly
US3562467A (en) * 1969-06-04 1971-02-09 Engelhard Min & Chem Electrical contact
CH529435A (de) * 1972-03-17 1972-10-15 Sprecher & Schuh Ag Verfahren zur Herstellung eines Vakuumschalterkontaktes
JPS50111078A (fr) 1974-02-20 1975-09-01
GB1517702A (en) * 1974-09-19 1978-07-12 Fujitsu Ltd Electrical contact
JPS58115728A (ja) * 1981-12-28 1983-07-09 三菱電機株式会社 真空しや断器用接点
DE3232097C2 (de) 1982-08-28 1984-08-02 Doduco KG Dr. Eugen Dürrwächter, 7530 Pforzheim Verfahren zur Erzeugung einer korrosionshemmenden Deckschicht auf Kontaktstücken aus Wolfram und nach diesem Verfahren hergestelltes Kontaktstück
EP0172411B1 (fr) * 1984-07-30 1988-10-26 Siemens Aktiengesellschaft Contacteur sous vide avec des pièces de contact de CuCr et procédé pour la fabrication de tels pièces
DE3509039A1 (de) * 1985-03-14 1986-09-18 W.C. Heraeus Gmbh, 6450 Hanau Verbundwerkstoff fuer elektrische kontakte und verfahren zu seiner herstellung
US6441315B1 (en) * 1998-11-10 2002-08-27 Formfactor, Inc. Contact structures with blades having a wiping motion

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004095485A1 *

Also Published As

Publication number Publication date
CN1777966A (zh) 2006-05-24
DE502004000154D1 (de) 2006-01-05
US7339127B2 (en) 2008-03-04
DE10318223A1 (de) 2004-12-02
BRPI0409636A (pt) 2006-04-25
ES2253731T3 (es) 2006-06-01
US20060278507A1 (en) 2006-12-14
JP2007535092A (ja) 2007-11-29
EP1535292B1 (fr) 2005-11-30
KR20060018215A (ko) 2006-02-28
ATE311657T1 (de) 2005-12-15
WO2004095485A1 (fr) 2004-11-04
PL1535292T3 (pl) 2006-05-31

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