EP0247541B1 - Elément de contact pour contacts interrupteurs électriques - Google Patents

Elément de contact pour contacts interrupteurs électriques Download PDF

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Publication number
EP0247541B1
EP0247541B1 EP87107505A EP87107505A EP0247541B1 EP 0247541 B1 EP0247541 B1 EP 0247541B1 EP 87107505 A EP87107505 A EP 87107505A EP 87107505 A EP87107505 A EP 87107505A EP 0247541 B1 EP0247541 B1 EP 0247541B1
Authority
EP
European Patent Office
Prior art keywords
weight
contact element
alloy
palladium
approximately
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
EP87107505A
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German (de)
English (en)
Other versions
EP0247541A1 (fr
Inventor
Klaus-Dieter Heppner
Josef Dr. Dipl.-Phys. 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 EP0247541A1 publication Critical patent/EP0247541A1/fr
Application granted granted Critical
Publication of EP0247541B1 publication Critical patent/EP0247541B1/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
    • H01H1/021—Composite material
    • H01H1/023—Composite material having a noble metal as the basic material

Definitions

  • the invention relates to a contact element for electrical switch contacts, in particular a contact tongue for electromagnetic relays, a two-layer contact pad being galvanically applied to a base made of base metal and at least one of the layers containing palladium.
  • a contact element is known in which a silver layer is applied over a nickel layer and a rhodium layer 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 coatings made of precious metals are either relatively expensive or can only be used in a limited range.
  • palladium for switch contacts is also known (electronics 15/1981, pages 53 to 61). Galvanic palladium layers of 1 to 2 ⁇ m are described as particularly abrasion-resistant. It is also pointed out that palladium layers are mostly covered with a layer of gold. Such layers of pure precious metals, such as palladium and gold, are very expensive. In addition, alloys of palladium for contact purposes, for example PdCu or AgPd30, are only known in the form of contact profiles, which cannot be used in all cases because of their material thickness. In addition, such contact profiles with high precious metal contents are also expensive.
  • the object of the invention is to provide a switching 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 therefore be reliable and can be used with a long service life both with very small and with very high switching currents and switching voltages.
  • this object is achieved with a contact element of the type mentioned in the introduction in that the inner layer has a thickness of 3 to 5 ⁇ m and is formed from an alloy of palladium and an additional component, the additional component having a proportion of 10 to 50% by weight.
  • % comprises and contains at least one element from the group nickel, cobalt and copper, and that the outer layer has a thickness of 0.1 to 1 microns and an alloy of palladium-silver or palladium-gold with a silver or gold content is formed from 10 to 40 wt .-%.
  • the contact element according to the invention thus has a two-layer contact surface with two different palladium alloys, the base layer or load layer being formed from an alloy of palladium and a base metal, while the outer conductive layer is formed from an alloy of palladium and a further noble metal to a much smaller thickness .
  • the individual contact layers can be applied in the specified, relatively small layer thicknesses with good quality, so that the total consumption of precious metal, in particular that of gold, is relatively low.
  • switching currents from a few ⁇ A to about 5 A and switching voltages from a few li V up to about 150 V can be operated correctly and with a large number of switching cycles.
  • the inner layer is expediently designed as a Pd-Ni layer with a Ni content of 10 to 50%, preferably of 20 to 30%; In another expedient form of application, the inner layer is designed as Pd-Co with a Co content of 10 to 40%, preferably about 25%.
  • a further embodiment contains an inner layer made of a Pd-Cu layer with a Cu content of 10 to 40% by weight, preferably approximately 20% by weight.
  • three-material alloys are also suitable for the inner contact layer, for example Pd-Ni-Cu with 10 to 40% by weight Ni-Cu, preferably 20% by weight Ni + 5% by weight Cu.
  • these three-component alloys can also contain proportions of tungsten or molybdenum.
  • a Pd-Ni-W alloy with 10 to 40 wt.% Ni + W, preferably about 15% Ni + 10% W or a Pd-Ni-Mo alloy with 10 to 40 wt. -% Ni + Mo, preferably about 15% Ni + about 10% Mo can be used.
  • a similar alloy composition can also be provided with cobalt, ie a Pd-Co-W alloy with 10 to 40% by weight Co + W, preferably approximately 15% by weight Co + approximately 10% by weight W or one Pd-Co-Mo alloy with 10 to 40% by weight Co + Mo, preferably approximately 15% by weight Co + approximately 10% by weight Mo.
  • cobalt ie a Pd-Co-W alloy with 10 to 40% by weight Co + W, preferably approximately 15% by weight Co + approximately 10% by weight W or one Pd-Co-Mo alloy with 10 to 40% by weight Co + Mo, preferably approximately 15% by weight Co + approximately 10% by weight Mo.
  • the outer layer or conductive layer has a thickness of between 0.1 and 1 gm, a thickness of approximately 0.5 ⁇ m preferably being used.
  • This outer layer preferably contains about 30% silver as Pd-Ag alloy or preferably 20% gold as Pd-Au alloy.
  • 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.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Contacts (AREA)

Claims (12)

1. Elément de contact pour des contacts électriques de coupure, notamment une languette de contact pour des relais électromagnétiques, dans lequel une surface d'appui formée de deux couches est déposée galvaniquement sur un support en métal ordinaire et au moins l'une des couches contient du palladium, caractérisé par le fait que la couche intérieure possède une épaisseur comprise entre 3 et 5 µm et est constituée par un alliage formé de palladium et d'un constituant supplémentaire, le constituant supplémentaire intervenant dans une proportion de 10 à 50% en poids et contenant au moins un élément du groupe nickel, cobalt et cuivre, et que la couche extérieure possède une épaisseur comprise entre 0,1 et 1 µm et est réalisée en un alliage de palladium-argent ou de palladium-or contenant un pourcentage d'argent ou d'or compris entre 10 et 40% en poids.
2. Elément de contact suivant la revendication 1, caractérisé par le fait que la couche intérieure est formée par un alliage de palladium-nickel, dont le pourcentage de nickel est compris entre 10 et 50% en poids et de préférence entre 20 et 30% en poids.
3. Elément de contact suivant la revendication 1, caractérisé par le fait que la couche intérieure est formée par un alliage de palladium-cobalt, dont le pourcentage de cobalt est compris entre 10 et 30% en poids et est égal de préférence approximativement à 25% en poids.
4. Elément de contact suivant la revendication 1, caractérisé par le fait que la couche intérieure est réalisée sous la forme d'un alliage de palladium-cuivre, dont le pourcentage de cuivre est compris entre 10 et 40% en poids et est égal de préférence approximativement à 20% en poids.
5. Elément de contact suivant la revendication 1, caractérisé par le fait que la couche intérieure est formée par un alliage de palladium-nickel-cuivre, dans lequel le pourcentage de nickel et de cuivre considérés conjointement est compris entre 10 et 40% en poids et dans lequel de préférence le pourcentage de nickel est égal à environ 20% en poids et le pourcentage de cuivre à environ 5% en poids.
6. Elément de contact suivant la revendication 1, caractérisé par le fait que la couche intérieure est formée par un alliage formé de trois éléments, contenant, en plus du palladium, un constituant supplémentaire formé de nickel et de tungstène ou de nickel et de molybdène intervenant pour un pourcentage total compris entre 10 et 40%.
7. Elément de contact suivant la revendication 6, caractérisé par le fait que l'alliage de la couche intérieure contient un pourcentage d'environ 15% de nickel et d'environ 10% de tungstène ou de molybdène.
8. Elément de contact suivant la revendication 1, caractérisé par le fait que le constituant additionnel contient du cobalt et en plus du tungstène ou du molybdène, et ce avec un pourcentage total d'alliage compris entre 10 et 40% en poids.
9. Elément de contact suivant la revendication 8, caractérisé par le fait que l'alliage de la couche intérieure contient un pourcentage d'environ 15% de cobalt et environ 10% de tungstène et de molybdène.
10. Elément de contact suivant l'une des revendications 1 à 9, caractérisé par le fait que la couche extérieure contient un pourcentage d'environ 30% d'argent.
11. Elément de contact suivant l'une des revendications 1 à 9, caractérisé par le fait que la couche extérieure contient un pourcentage égal à environ 20% d'or.
12. Elément de contact suivant l'une des revendications 1 à 11, caractérisé par le fait que la couche intérieure possède une épaisseur égale approximativement à 4 lim.
EP87107505A 1986-05-26 1987-05-22 Elément de contact pour contacts interrupteurs électriques Expired - Lifetime EP0247541B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3617627 1986-05-26
DE3617627 1986-05-26

Publications (2)

Publication Number Publication Date
EP0247541A1 EP0247541A1 (fr) 1987-12-02
EP0247541B1 true EP0247541B1 (fr) 1990-10-24

Family

ID=6301641

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87107505A Expired - Lifetime EP0247541B1 (fr) 1986-05-26 1987-05-22 Elément de contact pour contacts interrupteurs électriques

Country Status (2)

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EP (1) EP0247541B1 (fr)
DE (1) DE3765696D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009036171B4 (de) * 2008-08-08 2015-10-22 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Verfahren zur galvanischen Abscheidung einer Beschichtung auf eine bipolare Platte einer Brennstoffzelle

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4243570C1 (de) * 1992-12-22 1994-01-27 Heraeus Gmbh W C Elektrischer Kontaktkörper
EP2216796A1 (fr) * 2009-02-05 2010-08-11 Delphi Technologies, Inc. Ensemble de contact coulissant

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2540944C3 (de) * 1975-09-13 1978-10-12 W.C. Heraeus Gmbh, 6450 Hanau Kontaktkörper für einen elektrischen Steckkontakt
DE2540999C3 (de) * 1975-09-13 1980-07-03 W.C. Heraeus Gmbh, 6450 Hanau Elektrischer Steckkontakt mit einer Kontaktschicht aus einer Silber-Palladium-Legierung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009036171B4 (de) * 2008-08-08 2015-10-22 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Verfahren zur galvanischen Abscheidung einer Beschichtung auf eine bipolare Platte einer Brennstoffzelle

Also Published As

Publication number Publication date
DE3765696D1 (de) 1990-11-29
EP0247541A1 (fr) 1987-12-02

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