EP0227972B1 - Elément de contact pour contacts interrupteurs électriques - Google Patents

Elément de contact pour contacts interrupteurs électriques Download PDF

Info

Publication number
EP0227972B1
EP0227972B1 EP19860116790 EP86116790A EP0227972B1 EP 0227972 B1 EP0227972 B1 EP 0227972B1 EP 19860116790 EP19860116790 EP 19860116790 EP 86116790 A EP86116790 A EP 86116790A EP 0227972 B1 EP0227972 B1 EP 0227972B1
Authority
EP
European Patent Office
Prior art keywords
layer
contact element
thickness
element according
nickel
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
Application number
EP19860116790
Other languages
German (de)
English (en)
Other versions
EP0227972A1 (fr
Inventor
Klaus-Dieter Heppner
Josef Dr.Rer.Nat. Weiser
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
Original Assignee
Siemens AG
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 filed Critical Siemens AG
Publication of EP0227972A1 publication Critical patent/EP0227972A1/fr
Application granted granted Critical
Publication of EP0227972B1 publication Critical patent/EP0227972B1/fr
Expired 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
    • H01H1/0201—Materials for reed contacts

Definitions

  • the invention relates to a contact element for electrical switch contacts, in particular a contact tongue for electromagnetic relays, wherein a three-layer contact pad is galvanically applied to a base made of base metal, the outermost layer of which is made of rhodium and the middle layer of which is silver or gold.
  • Such a contact element is known from DE-C 3 203 037, in which a silver layer is applied over a nickel layer and a rhodium layer is applied over it. Such contact surfaces have a low tendency to cold sweat.
  • the same document also describes the use of gold contact layers with a rhodium coating as known. In general, however, previously known multilayer pads made of precious metals are either relatively expensive or can only be used in a limited range.
  • the object of the invention is to provide a switch contact of the type mentioned at the outset, which has the smallest possible proportion of expensive precious metals, but can be used over the widest possible range of switching powers.
  • the contact should be reliable and can be used with a long service life both with very small and with very high switching currents and switching voltages.
  • the bottom layer of the contact pad consists of a palladium-nickel alloy with a nickel content between 10% and 40% and has a thickness between 2 microns and 10 microns that the middle, made of gold or Silver existing layer has a thickness below 1 11m and that the outer rhodium layer has a thickness between 0.4 microns and 1 micron.
  • the individual contact layers can be applied in the specified, relatively small layer thicknesses with good quality, so that the proportion of noble metal in the overall contact layer is still relatively low.
  • the main part is made up of the palladium-nickel alloy, which is still relatively inexpensive compared to pure precious metals such as gold, rhodium and platinum.
  • the palladium-nickel layer expediently has a nickel content of between 20% and 30%, preferably of 25% and a thickness of 4 to 6 ⁇ m, preferably of 5 ⁇ m.
  • the gold or silver layer has a thickness between 0.1 and 111 m, preferably of 0.5 ⁇ m.
  • the rhodium layer preferably also has a thickness of 0.5 ⁇ m.
  • contact layers are applied galvanically, wherein selective electroplating methods are preferably used, which are known, for example, under the terms nozzle electroplating or jetplating, brush electroplating and laser electroplating. With these methods, the contact layers are applied only where they are needed, so that a particularly economical use of the noble metals is possible in this way.

Landscapes

  • Electroplating Methods And Accessories (AREA)
  • Contacts (AREA)

Claims (9)

1. Elément de contact pour des contacts électriques de coupure, notamment une languette de contact pour des relais électromagnétiques, et dans lequel sur un support réalisé en un métal commun est disposé un revêtement de contact à trois couches, qui est formé galvaniquement et dont la couche la plus extérieure est constituée par du rhodium et dont la couche médiane est constituée par de l'argent ou de l'or, caractérisé par le fait que la couche inférieure du revêtement de contact est constituée par un alliage de palladium-nickel possédant une teneur en nickel comprise entre 10% et 40% et une épaisseur comprise entre 2 µm et 10 µm, que la couche médiane formée d'or ou d'argent possède une épaisseur inférieure à 1 µm, et que la couche extérieure de rhodium possède une épaisseur comprise entre 0,4 µm et 1 µm.
2. Elément de contact suivant la revendication 1, caractérisé par le fait que l'alliage de palladium-nickel possède une teneur en nickel comprise entre 20% et 30%.
3. Elément de contact suivant la revendication 2, caractérisé par le fait que la couche de palladium- nickel possède une teneur en nickel égale à environ 25%.
4. Elément de contact suivant l'une des revendications 1 à 3, caractérisé par le fait que la couche de palladium-nickel possède une épaisseur comprise entre 4 µm et 6 µm.
5. Elément de contact suivant la revendication 4, caractérisé par le fait que la couche de palladium- nickel possède une épaisseur de 5 um.
6. Elément de contact suivant l'une des revendications 1 à 5, caractérisé par le fait que la couche d'or ou d'argent possède une épaisseur comprise entre 0,1 µm et 1 µm.
7. Elément de contact suivant la revendication 6, caractérisé par le fait que la couche d'or ou d'argent possède une épaisseur égale à 0,5 µm.
8. Elément de contact suivant l'une des revendications 1 à 7, caractérisé par le fait que la couche de rhodium possède une épaisseur égale à 0,5 µm.
9. Elément de contact suivant l'une des revendications 1 à 8, caractérisé par le fait que les couches de contact sont déposées au moyen d'un procédé sélectif de galvanoplastie, mis en oeuvre par exemple à l'aide d'un dispositif de galvanoplastie à buses, un dispositif de galvanoplastie à brosses ou un dispositif de galvanoplastie au laser.
EP19860116790 1985-12-06 1986-12-03 Elément de contact pour contacts interrupteurs électriques Expired EP0227972B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3543238 1985-12-06
DE3543238 1985-12-06

Publications (2)

Publication Number Publication Date
EP0227972A1 EP0227972A1 (fr) 1987-07-08
EP0227972B1 true EP0227972B1 (fr) 1989-08-02

Family

ID=6287858

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860116790 Expired EP0227972B1 (fr) 1985-12-06 1986-12-03 Elément de contact pour contacts interrupteurs électriques

Country Status (2)

Country Link
EP (1) EP0227972B1 (fr)
DE (1) DE3664833D1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19530512C1 (de) * 1995-08-18 1996-10-17 Siemens Ag Elektrisches Schichtkontaktelement, Halbzeug für Schichtkontaktelemente und Verfahren zu seiner Herstellung

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2442212A1 (de) * 1974-09-04 1976-03-25 Licentia Gmbh Verfahren zur haftfesten galvanischen beschichtung von kontaktwerkstoffen mit rhodium
DE3203037C2 (de) * 1982-01-29 1984-03-08 Siemens AG, 1000 Berlin und 8000 München Kontaktelement und Verfahren zu dessen Herstellung

Also Published As

Publication number Publication date
DE3664833D1 (en) 1989-09-07
EP0227972A1 (fr) 1987-07-08

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