EP0736216B1 - Materiau de contact a base d'argent pour appareils de commutation utilises en genie en matiere d'energie - Google Patents

Materiau de contact a base d'argent pour appareils de commutation utilises en genie en matiere d'energie Download PDF

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Publication number
EP0736216B1
EP0736216B1 EP95902764A EP95902764A EP0736216B1 EP 0736216 B1 EP0736216 B1 EP 0736216B1 EP 95902764 A EP95902764 A EP 95902764A EP 95902764 A EP95902764 A EP 95902764A EP 0736216 B1 EP0736216 B1 EP 0736216B1
Authority
EP
European Patent Office
Prior art keywords
oxide
silver
contact material
ferrotungstate
material according
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
EP95902764A
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German (de)
English (en)
Other versions
EP0736216A1 (fr
Inventor
Franz Hauner
Manfred Müller
Günter Tiefel
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
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0736216A1 publication Critical patent/EP0736216A1/fr
Application granted granted Critical
Publication of EP0736216B1 publication Critical patent/EP0736216B1/fr
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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
    • H01H1/0237—Composite material having a noble metal as the basic material and containing oxides
    • 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
    • H01H1/0237—Composite material having a noble metal as the basic material and containing oxides
    • H01H2001/02378—Composite material having a noble metal as the basic material and containing oxides containing iron-oxide as major component

Definitions

  • the invention relates to a silver-based contact material for use in switching devices in power engineering, in particular for contact pieces in low-voltage switching devices, which contains at least iron oxide and zirconium oxide in addition to silver as active components.
  • contact materials are known on the one hand of the silver-metal system (AgMe) and on the other hand of the silver-metal oxide system (AgMeO).
  • Representatives of the first system are, for example, silver-nickel (AgNi) or silver-iron (AgFe);
  • Representatives of the second system are in particular silver-cadmium oxide (AgCdO) or silver-tin oxide (AgSnO 2 ).
  • there may be other metal oxides such as, in particular, bismuth oxide (Bi 2 O 3 ), copper oxide (CuO) and / or tantalum oxide (Ta 2 O 5 ).
  • the practical usability of a contact material based on silver-metal or silver-metal oxide is determined by the so-called electrical contact property spectrum. Relevant parameters are the lifetime switching number on the one hand, which is determined by the erosion of the switching element, and the so-called overtemperature on the other hand, ie the heating of a contact bridge, which essentially results from the electrical resistance of the mentioned contact results. In addition, a sufficiently low tendency to weld the contact pieces and also corrosion resistance are important, since the switching properties can change over time, in particular due to long-term corrosion of the material in air switching devices.
  • a contact material of the type mentioned is known, in which iron oxide in mass proportions between 1 and 50% and an oxide of a further chemical element in mass proportions between 0.01 and 5% are present as active components.
  • Zirconium oxide is mentioned as a further metal oxide. It has been shown that the combination of iron oxide and zirconium oxide in particular has a favorable switching property spectrum.
  • a material especially of the constitution AgFe 2 O 3 / Fe 3 O 4 ZrO 2 is characterized in addition to low contact heating, stable heating behavior, low tendency to weld and a long service life in particular by good corrosion resistance.
  • the object of the invention is therefore to further improve a material based on silver, iron oxide and zirconium oxide.
  • the object is according to the invention by adding a further oxide of the sixth subgroup of the periodic table and / or a mixed oxide consisting of iron oxide and the oxide of an element of the sixth subgroup of the periodic table.
  • the additive is preferably a mixed oxide with the elements iron and tungsten, in particular the additive is ferrotungstate (FeWO 4 ).
  • the material according to the invention is preferably characterized by mass fractions of 1 to 50% iron oxide and 0.1 to 5% zirconium oxide with an addition in mass fractions of 0.01 to 5% of the further oxide, the rest being silver.
  • the material is characterized in mass fractions by 2 to 20% iron oxide, 0.05 to 5% zirconium oxide and 0.01 to 2% ferrotungstate, the rest silver. It has been shown that the proportion of ferrotungstate in mass fractions can be less than 1%, in particular less than 0.05%.
  • the table shows the switch-on capacity for a material according to the invention in comparison with the materials of the prior art.
  • a 15 kW contactor is used for measurement in all cases.
  • a powder mixture is prepared by wet mixing the oxide powders.
  • the powder mixture is used to either extrude tapes or wires of the material as a semi-finished product for contact pads, or to produce contact pieces directly using so-called molding technology. In both cases, it is advantageous for secure connection technology with the contact carrier to produce two-layer tapes or two-layer contact pieces with a solderable silver layer on the back.
  • the concentrations of the individual active components can be varied. So-called mechanical alloying of silver and single oxide powders can also be used to produce suitable powder mixtures of silver, iron oxide, zirconium oxide and ferrotungstate. As a result, the structural properties of the finished material are advantageously influenced.
  • the AgFe 2 O 3 5.4 ZrO 2 l-FeWO 4 O, 4 material produced is compared in the table with two materials known from the prior art.
  • the welding limit current strength of the contact materials and the current carrying capacity of the device are listed, which were measured under the same conditions on the 15 kW / contactor.
  • the other contact properties of the materials correspond to the requirements for contactor applications.

Landscapes

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

Abstract

On propose de plus en plus des matériaux de substitution pour les pièces de contact de commutateurs basse tension qui jusqu'à maintenant étaient souvent constituées d'argent-nickel. Afin d'améliorer la capacité de commutation d'un tel matériau de substitution, qui contient outre l'argent au moins de l'oxyde de fer (Fe2O3/Fe3O4) et de l'oxyde de zirconium (ZrO2) comme composants actifs, pour ce qui est de l'intensité du courant limite de soudage, on y ajoute un autre oxyde du sixième groupe secondaire du système périodique et/ou un oxyde mixte constitué d'oxyde de fer et d'un oxyde d'un élément du sixième groupe secondaire du système périodique. Cet additif supplémentaire est notamment du ferro-wolframate (FeWO4).

Claims (7)

  1. Matière de contact à base d'argent pour emploi dans des appareils de commutation dans la technique des courants forts et, plus particulièrement, dans des pièces de contact dans des commutateurs en basse tension, et qui, outre de l'argent, renferme comme constituants actifs, au moins de l'oxyde de fer (Fe2O3 / Fe3O4 ) et de l'oxyde de zirconium (ZrO2), caractérisée par une addition d'un autre oxyde du sixième sous-groupe de la classification périodique des éléments et/ou un oxyde mixte constitué d'oxyde de fer et de l'oxyde d'un élément du sixième sous -groupe de la classification périodique des éléments.
  2. Matière de contact selon revendication 1, caractérisée en ce que l'additif est un oxyde mixte ayant les éléments fer et tungstène.
  3. Matière de contact selon revendication 2, caractérisée en ce que l'additif est du ferrotungstate (FeW04).
  4. Matière de contact selon revendication 1, caractérisée en ce que les constituants actifs représentent, en proportions pondérales, pour l'oxyde de fer (Fe2O3/Fe3O4 ) entre 1% et 50 %, l'oxyde de zirconium (ZrO2) entre 0,01 % et 5 %, et un autre oxyde entre 0,01 % et 5 %.
  5. Matière de contact selon revendication 4, dans laquelle l'additif actif est du ferrotungstate, caractérisée par des proportions pondérales de 2% à 20 % d'oxyde de fer (Fe2O3 / Fe3O4), de 0,05% à 5 % d'oxyde de zirconium (ZrO) et 0,05% à 2 % de ferrotungstate (FeW04) le reste étant de l'argent (Ag).
  6. Matière de contact selon revendication 5, caractérisée en ce que la proportion pondérale de ferrotungstate (FeW04) est inférieure à 1 %.
  7. Matière de contact selon revendication 6, caractérisée en ce que la proportion pondérale de ferrotungstate (FeW04) est inférieure à 0,5 %.
EP95902764A 1993-12-20 1994-12-14 Materiau de contact a base d'argent pour appareils de commutation utilises en genie en matiere d'energie Expired - Lifetime EP0736216B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4343550A DE4343550A1 (de) 1993-12-20 1993-12-20 Kontaktwerkstoff auf Silberbasis zur Verwendung in Schaltgeräten der Energietechnik
DE4343550 1993-12-20
PCT/DE1994/001488 WO1995017758A1 (fr) 1993-12-20 1994-12-14 Materiau de contact a base d'argent pour appareils de commutation utilises en genie en matiere d'energie

Publications (2)

Publication Number Publication Date
EP0736216A1 EP0736216A1 (fr) 1996-10-09
EP0736216B1 true EP0736216B1 (fr) 1997-09-03

Family

ID=6505579

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95902764A Expired - Lifetime EP0736216B1 (fr) 1993-12-20 1994-12-14 Materiau de contact a base d'argent pour appareils de commutation utilises en genie en matiere d'energie

Country Status (4)

Country Link
US (1) US5663500A (fr)
EP (1) EP0736216B1 (fr)
DE (2) DE4343550A1 (fr)
WO (1) WO1995017758A1 (fr)

Families Citing this family (9)

* 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
DE19543223C1 (de) 1995-11-20 1997-02-20 Degussa Silber-Eisen-Werkstoff für elektrische Schaltkontakte (III)
DE19543222C1 (de) * 1995-11-20 1997-02-20 Degussa Silber-Eisen-Werkstoff für elektrische Schaltkontakte (I)
DE19543208C1 (de) 1995-11-20 1997-02-20 Degussa Silber-Eisen-Werkstoff für elektrische Schaltkontakte (II)
DE19608490C1 (de) * 1996-03-05 1997-09-04 Siemens Ag Kontaktwerkstoff aus Silber und Wirkkomponenten, daraus gefertigtes Formstück sowie Verfahren zur Herstellung des Formstücks
BR9710794A (pt) * 1996-08-01 1999-08-17 Metalor Contacts Deutschland G Processo para a prepara-Æo de um produto de um amterial de contato a base de prata material de contato bem como produto do material de contato
US5903008A (en) * 1997-07-02 1999-05-11 General Electric Company Scatter correction methods and systems in single photon emission computed tomography
US20070018526A1 (en) * 2004-06-18 2007-01-25 Tanaka Kikinzoku Kogyo K.K. Relay for sealed ac load and ag-base contact element material for use therein
CN104475733A (zh) * 2014-12-30 2015-04-01 桂林电器科学研究院有限公司 一种片状银镍钨电触头材料的制备方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3017424A1 (de) * 1980-05-07 1981-11-12 Degussa Ag, 6000 Frankfurt Werkstoff fuer elektrische kontakte
YU46258B (sh) * 1987-06-06 1993-05-28 Degussa Ag. Primena srebrno gvozdenog materijala za električne kontakte
DE4117311A1 (de) * 1991-05-27 1992-12-03 Siemens Ag Kontaktwerkstoff auf silberbasis zur verwendung in schaltgeraeten der energietechnik
DE4201940A1 (de) * 1992-01-24 1993-07-29 Siemens Ag Sinterverbundwerkstoff fuer elektrische kontakte in schaltgeraeten der energietechnik

Also Published As

Publication number Publication date
WO1995017758A1 (fr) 1995-06-29
DE4343550A1 (de) 1995-06-22
EP0736216A1 (fr) 1996-10-09
DE59403995D1 (de) 1997-10-09
US5663500A (en) 1997-09-02

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