EP1535292B1 - Plot de contact en tungstene pourvu d'une couche anticorrosive en etain - Google Patents

Plot de contact en tungstene pourvu d'une couche anticorrosive en etain Download PDF

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Publication number
EP1535292B1
EP1535292B1 EP04728163A EP04728163A EP1535292B1 EP 1535292 B1 EP1535292 B1 EP 1535292B1 EP 04728163 A EP04728163 A EP 04728163A EP 04728163 A EP04728163 A EP 04728163A EP 1535292 B1 EP1535292 B1 EP 1535292B1
Authority
EP
European Patent Office
Prior art keywords
tungsten
tin
layer
contact
contact piece
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.)
Expired - Lifetime
Application number
EP04728163A
Other languages
German (de)
English (en)
Other versions
EP1535292A1 (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

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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
    • 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 pad in electromechanical switchgear is due its extraordinary erosion resistance of all refractory metals the metal of choice when it comes to fast switching associated with significant Sparking is possible.
  • tungsten contact pieces in the various switching devices such as vehicle breakers, car horns and relays be used without interference.
  • the contact piece is usually as a rivet with a Wolframide soldered as a contact pad on a rivet-shaped carrier Soft iron or copper made (see Fig.1).
  • Tungsten is not a precious metal. When switching under air is with oxidic Cover layers to be expected. Corrosion phenomena on tungsten contact pieces have been known as a problem for over 50 years and interfere with unfavorable Switching conditions the universal scope of tungsten as Contact material. In dry air, even in a hot environment (desert climate) remains the tungsten contact for a long time unimpaired and fully functional. But kick Adding moisture (tropical climate), rapid corrosion takes place of the unprotected Wolfram.
  • Tungsten contact pairings tend to increase in warm and humid climates To fail. This is observed in a statistically conspicuous way with horn contacts, if, for example, before the sales type of a new car type a certain Number of cars on heap is produced, there may be months under Warm humid conditions are available before they go to the dealer for delivery reach.
  • a process well known to those skilled in the art is the coating of the complete Contact rivet before installation in the switching device with a thin nickel layer. Due to the passivation of the nickel, the contact remains uncovered Undamaged nickel layer long time bright and free of corrosion layers.
  • Ni-layer is the horn manufacturer by the necessary honking of the new horn on the switching surface partly destroyed The protective effect of the Ni-layer is greatly degraded. In the field trial is a positive effect of a Nickel plating is no longer clear.
  • US-A-2,547,947 describes electrical contact arrangements for Ignition systems of internal combustion engines, in which the movable Part consists of a steel or iron arm, on which a tungsten contact disk plotted or - welded. To obstruct the Deformation of dark colored deposits on the tungsten surface if the arrangement is plated with nickel, chromium, cadmium or zinc, the contact surface and its edges after the Plating to remove plated metal from these Areas of the tungsten surface were polished.
  • Japanese Patent Publication 20128/1974 discloses the use of Graphite powder as carburizing agent.
  • German Offenlegungsschrift 3232097 A1 discloses the use of propane as carburizing agent in a protective gas furnace. An impairment of the solder side of Tungsten contact pad by simultaneous unwanted carburization and a Impairment of OfenMapleiter is not excluded.
  • German Offenlegungsschrift 3626144 A1 discloses contact, a silver base, an intermediate layer of tin and an outer layer from tungsten.
  • the invention is therefore based on the object, one of a Cu or Ag brazing Tungsten pad soldered to a metallic support Contact piece to develop under corrosive conditions, especially under the Exposure to a warm and humid climate does not affect the Show switching properties.
  • the invention thus relates to a contact piece with tungsten support (1), the Lot (2) and carrier (3) coated with a thin layer (4) of tin is.
  • Preferred Au exitsformen of the rivet are the subject of claims 2 to 3.
  • a method for producing the contact piece is in claims 4 to 7 described.
  • Tin is only slightly in the voltage series in contrast to the less noble metals Ni, Cu, Cd and Zu proposed in US Pat. No. 2,547,547, which are particularly suitable proved. It should be emphasized in a galvanic deposition of Sn, that it This is a very cost effective method with an aesthetic appealing result.
  • Form nobler elements such as copper (as Cu solder) or Ag (as electrolytic Cover) with W a local element, preferably the tungsten of the W contact pad as a so-called sacrificial anode in solution.
  • a local element formation is Ag as a protective layer counterproductive and copper as adjacent solder layer even conducive to corrosion. The same is to be assumed for the by potential shift cathodic, that is nobler behaving Ni.
  • Humidity sets On a separate porcelain carrier rivets, as they correspond to the state of the art - added without reference additional galvanic base metal layer - as a reference.
  • the desiccator is heated to a constant 50 ° C in a climate controlled cabinet for 48 h.
  • FIGS. 2 and 4 The result after 48h is shown in FIGS. 2 and 4.
  • the galvanic post-treated rivets show in comparison to the non-corroded standard (FIG. only slight tarnish on the contact surface.
  • the W surface with thick greenish-brown Crusts that extend from the circumference of the Cu solder into the tungsten surface partially reach to the middle, covered.
  • These crusts are presumably inorganic salts of copper and tungsten. Are they? between the closed contacts of a horn, this leads to the increase of the Contact resistance and therefore to the failure of the horn.

Landscapes

  • Contacts (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Details Of Resistors (AREA)
  • Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)

Claims (8)

  1. Plot de contact comprenant une couche de tungstène (1) brasée sur un support métallique (3) par une couche d'apport de brasage (2), caractérisé en ce que des parties au moins de la couche d'apport de brasage (2) et du support (3) sont revêtues d'une couche d'étain (4).
  2. Plot de contact selon la revendication 1, caractérisé en ce que la couche d'étain présente une épaisseur de 0,1 à 20 µm.
  3. Plot de contact selon la revendication 2, caractérisé en ce que la couche d'étain présente une épaisseur de 0,2 à 2 µm.
  4. Procédé pour réaliser un plot de contact selon l'une des revendications 1 à 3, caractérisé en ce que l'on applique sur le plot de contact une couche d'étain (4) et ensuite on enlève le cas échéant l'étain (4) présent sur la couche de tungstène (1).
  5. Procédé selon la revendication 4, caractérisé en ce que l'application de la couche s'effectue par voie galvanique.
  6. Procédé selon l'une ou l'autre des revendications 4 ou 5, caractérisé en ce que l'on applique l'étain sélectivement sur l'apport de brasage et sur le support métallique.
  7. Procédé selon l'une des revendications 4 à 6, caractérisé en ce que la remise à découvert de la couche de tungstène s'effectue par ponçage.
  8. Utilisation du plot de contact selon l'une des revendications 1 à 3 à titre de contact de klaxon ou de contact de relais.
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 EP1535292A1 (fr) 2005-06-01
EP1535292B1 true 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

Also Published As

Publication number Publication date
ATE311657T1 (de) 2005-12-15
JP2007535092A (ja) 2007-11-29
PL1535292T3 (pl) 2006-05-31
EP1535292A1 (fr) 2005-06-01
DE10318223A1 (de) 2004-12-02
DE502004000154D1 (de) 2006-01-05
BRPI0409636A (pt) 2006-04-25
US7339127B2 (en) 2008-03-04
CN1777966A (zh) 2006-05-24
WO2004095485A1 (fr) 2004-11-04
KR20060018215A (ko) 2006-02-28
US20060278507A1 (en) 2006-12-14
ES2253731T3 (es) 2006-06-01

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