EP0251204A1 - Elektrischer Kontakt - Google Patents

Elektrischer Kontakt Download PDF

Info

Publication number
EP0251204A1
EP0251204A1 EP87109130A EP87109130A EP0251204A1 EP 0251204 A1 EP0251204 A1 EP 0251204A1 EP 87109130 A EP87109130 A EP 87109130A EP 87109130 A EP87109130 A EP 87109130A EP 0251204 A1 EP0251204 A1 EP 0251204A1
Authority
EP
European Patent Office
Prior art keywords
electrical contact
intermediate layer
layer
cover layer
hard
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.)
Withdrawn
Application number
EP87109130A
Other languages
German (de)
English (en)
French (fr)
Inventor
Alfred Dr. Murr
Albert Dipl.-Phys. Phildius
Heinrich Ing.Grad. Kallhardt
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP0251204A1 publication Critical patent/EP0251204A1/de
Withdrawn legal-status Critical Current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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H01H1/021—Composite material
    • H01H1/023—Composite material having a noble metal as the basic material

Definitions

  • the present invention includes an electrical contact with an intermediate layer applied to a carrier and a cover layer applied thereon.
  • the intermediate layer consists of at least one metal from the platinum group, which is optionally provided with an additive of up to 50% nickel or consists entirely of silver.
  • a cover layer is applied to this intermediate layer, which is formed by a gold alloy composed of 8 to 30% silver, 0.5 to 5% platinum and the rest gold.
  • This electrical contact is essentially only suitable for those applications in which no high abrasion resistance of the cover layer is required.
  • the reason for the low abrasion resistance can be seen in the relatively soft gold-silver alloy, which wears out relatively quickly with frequent contact operations. This in turn has the consequence that, due to the abrasion, the intermediate layer consisting of palladium-silver effects the contact.
  • this intermediate layer is not sufficiently corrosion-resistant, which results in a high contact resistance and is therefore not universally z. B. can be used in the tropics.
  • the object of the present invention is therefore to create an electrical contact with which very little until high electrical loads can be switched.
  • This object is achieved in that the intermediate layer consists of a very erosion-resistant and the cover layer of a non-corrosive hard, electrically good conductive contact material of small thickness.
  • the relatively thin cover layer provides a good electrical connection with negligible ohmic resistance (milliohm range), so that this contact is preferred for electrical circuits with low currents, e.g. B. electronic circuits.
  • high electrical loads e.g. Switching off inductors burns this cover layer relatively quickly due to the formation of sparks, so that the intermediate layer underneath causes contact. In this case the contact resistance is not so important.
  • the electrical contact can be used within a wide range. This makes it possible to reduce the number of different contacts that were required in the past and that have a different structure, which in turn simplifies storage considerably and reduces the risk of confusion when assembling the devices in question. Due to this reduction in the type of contacts, the manufacturing costs can also be reduced.
  • the intermediate layer consists of a silver-palladium alloy and the cover layer consists of an electroplated hard gold layer deposited thereon.
  • the hard gold cover layer is a hard, electrically conductive and corrosion-resistant contact material, while the silver-palladium intermediate layer is particularly resistant to erosion. It has proven particularly expedient for the thickness of the intermediate layer to be approximately 50 ⁇ m and the thickness of the cover layer is about 2 ⁇ m.
  • the hard gold cover layer can be formed by an alloy, with about 0.2 to 0.4% cobalt being added to the gold.
  • the electrical contact shown in Fig. 1 consists of a carrier 1, an intermediate layer 2 and a cover layer 3.
  • the carrier 1 can be made of a non-resilient material, eg. B. iron, while the intermediate layer 2 consists of a silver-palladium alloy and the top layer of hard gold.
  • FIG. 2 The embodiment shown in FIG. 2 is constructed essentially in the same way as the electrical contact according to FIG. 1.
  • the carrier 1 consists of a spring wire, on the jacket of which an intermediate layer 2 made of silver-palladium and a cover layer 3 made of hard gold are applied.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Contacts (AREA)
EP87109130A 1986-06-30 1987-06-25 Elektrischer Kontakt Withdrawn EP0251204A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3621920 1986-06-30
DE3621920 1986-06-30

Publications (1)

Publication Number Publication Date
EP0251204A1 true EP0251204A1 (de) 1988-01-07

Family

ID=6304057

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87109130A Withdrawn EP0251204A1 (de) 1986-06-30 1987-06-25 Elektrischer Kontakt

Country Status (9)

Country Link
EP (1) EP0251204A1 (enrdf_load_stackoverflow)
JP (1) JPS6310415A (enrdf_load_stackoverflow)
KR (1) KR880001002A (enrdf_load_stackoverflow)
AR (1) AR240630A1 (enrdf_load_stackoverflow)
AU (1) AU580916B2 (enrdf_load_stackoverflow)
BR (1) BR8703290A (enrdf_load_stackoverflow)
CA (1) CA1308151C (enrdf_load_stackoverflow)
IN (1) IN166545B (enrdf_load_stackoverflow)
ZA (1) ZA874676B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19809450A1 (de) * 1998-03-06 1999-09-23 Inovan Stroebe Elektrisches Mehrlagen-Kontaktprofil
WO2007039302A1 (de) * 2005-10-05 2007-04-12 W.C. Heraeus Gmbh Schleifringkörper zur kontinuierlichen stromübertragung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2540944A1 (de) * 1975-09-13 1977-03-24 Heraeus Gmbh W C Elektrischer steckkontakt
DE2540943A1 (de) * 1975-09-13 1977-03-24 Heraeus Gmbh W C Elektrischer steckkontakt
US4337133A (en) * 1979-06-20 1982-06-29 Bell Telephone Laboratories, Incorporated Hard gold surfaces

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2604291C3 (de) * 1976-02-04 1981-08-20 Siemens AG, 1000 Berlin und 8000 München Werkstoffanordnung für elektrische Schwachstromkontakte
DE3214989A1 (de) * 1982-04-22 1983-11-10 Doduco KG Dr. Eugen Dürrwächter, 7530 Pforzheim Mit edelmetall oder einer edelmetallegierung beschichtetes elektrisches kontaktstueck
AU577287B2 (en) * 1984-05-29 1988-09-22 Burlington Industries, Inc. Amorphous transition metal alloy, thin gold coated, electrical contact

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2540944A1 (de) * 1975-09-13 1977-03-24 Heraeus Gmbh W C Elektrischer steckkontakt
DE2540943A1 (de) * 1975-09-13 1977-03-24 Heraeus Gmbh W C Elektrischer steckkontakt
US4337133A (en) * 1979-06-20 1982-06-29 Bell Telephone Laboratories, Incorporated Hard gold surfaces

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19809450A1 (de) * 1998-03-06 1999-09-23 Inovan Stroebe Elektrisches Mehrlagen-Kontaktprofil
EP0940829A3 (de) * 1998-03-06 2000-05-03 INOVAN GmbH & Co. KG Metalle und Bauelemente Elektrisches Mehrlagen-Kontaktprofil
WO2007039302A1 (de) * 2005-10-05 2007-04-12 W.C. Heraeus Gmbh Schleifringkörper zur kontinuierlichen stromübertragung

Also Published As

Publication number Publication date
CA1308151C (en) 1992-09-29
IN166545B (enrdf_load_stackoverflow) 1990-06-02
AU580916B2 (en) 1989-02-02
KR880001002A (ko) 1988-03-30
BR8703290A (pt) 1988-03-15
JPS6310415A (ja) 1988-01-18
AU7479987A (en) 1988-01-07
AR240630A1 (es) 1990-06-30
ZA874676B (en) 1988-01-08

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Inventor name: PHILDIUS, ALBERT, DIPL.-PHYS.

Inventor name: KALLHARDT, HEINRICH, ING.GRAD.

Inventor name: MURR, ALFRED, DR.