[go: up one dir, main page]

EP0586411A1 - SILVER-BASED CONTACT MATERIAL FOR USE IN SWITCHING APPARATUS IN HIGH CURRENT TECHNOLOGY, AS WELL AS PROCESS FOR THE MANUFACTURE OF CONTACT PARTS THEREOF. - Google Patents

SILVER-BASED CONTACT MATERIAL FOR USE IN SWITCHING APPARATUS IN HIGH CURRENT TECHNOLOGY, AS WELL AS PROCESS FOR THE MANUFACTURE OF CONTACT PARTS THEREOF.

Info

Publication number
EP0586411A1
EP0586411A1 EP92909684A EP92909684A EP0586411A1 EP 0586411 A1 EP0586411 A1 EP 0586411A1 EP 92909684 A EP92909684 A EP 92909684A EP 92909684 A EP92909684 A EP 92909684A EP 0586411 A1 EP0586411 A1 EP 0586411A1
Authority
EP
European Patent Office
Prior art keywords
iron
rhenium
material according
contact
silver
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.)
Granted
Application number
EP92909684A
Other languages
German (de)
French (fr)
Other versions
EP0586411B1 (en
Inventor
Franz Hauner
Wolfgang Haufe
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 EP0586411A1 publication Critical patent/EP0586411A1/en
Application granted granted Critical
Publication of EP0586411B1 publication Critical patent/EP0586411B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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 silver-based contact material for use in switchgear in power engineering, in particular for contact pieces in low-voltage switches, which, in addition to silver, contains at least one higher-melting metal, a metal alloy or a metal compound as further active components.
  • the invention also relates to a method for producing contact pieces from such a material.
  • contact pieces in low-voltage switching devices in energy technology e.g. In circuit breakers as well as in direct current, motor and auxiliary contactors
  • contact materials of the silver-metal system AgMe
  • Examples of this system are silver-nickel (AgNi) and silver-iron (AgFe).
  • Silver-nickel has advantageous contact properties which, together with the test methods for contact materials, for example in INT.J. Powder Metallurgy and Powder Technology, Vol. 12 (1976), P 219-228.
  • nickel dust in particular has harmful effects on the human organism.
  • DE-C-38 16 895 describes the use of a silver-iron workpiece with 3 to 30% by weight of iron and one or more of the additives manganese, copper, zinc, antimony, bismuth oxide, molybdenum oxide, tungsten oxide, chromium nitride Quantities totaling 0.05 to 5% by weight, the rest silver proposed for electrical contacts.
  • DE-A-39 11 904 discloses a powder metallurgical process for producing a semi-finished product for electrical contacts from a silver-based composite material with iron, in which 5 to 50% by weight of iron is the first secondary component and 0 to 5% by weight. % of a second minor component from one or more substances from the group containing the metals titanium, zirconium, niobium, tantalum, molybdenum, manganese, copper and zinc as well as their oxides and their carbides.
  • the object of the invention is a further contact material on silver egg to find the sen base and the associated manufacturing process.
  • the new material should be characterized by low contact heating with stable heating behavior, acceptable tendency to weld and a long service life in relation to the specified switching currents.
  • the object is achieved according to the invention in a material of the type mentioned at the outset that the active components in combination are iron in mass fractions between 1 and 50% and rhenium in mass fractions between 0.01 and 5%.
  • the iron and the iron are iron in mass fractions between 1 and 50% and rhenium in mass fractions between 0.01 and 5%.
  • Rhenium can be added to the silver in the form of pure metals and / or as an alloy, the material being produced by powder metallurgy.
  • the ratio of the mass fractions of iron to rhenium can be between approximately 4: 1 and approximately 20: 1.
  • the iron content will be considerably less than 50%.
  • the iron will be present in mass fractions of 2 to 25% and the rhenium in mass fractions of 0.1 to 3%.
  • Switching tests with contact materials in which the iron is in a mass fraction of 2 to 10% and the rhenium in a mass fraction of 0.1 to 1% have shown particularly advantageous results.
  • the total volume fraction of the two active components can fluctuate within comparatively wide limits. For example, it is 6, 12 or 18%.
  • the table comprises six exemplary embodiments with meaningful compositions of the claimed silver-iron-rhenium contact material.
  • manufacture the actual material and the manufacture of the relevant contact pieces is carried out according to partly different methods.
  • the measured values of the individual AgFeRe materials are compared with AgFe9 and AgRe20 and with pure silver. The results are discussed in more detail below.
  • Rhenium melted an iron-rhenium alloy. This alloy melt is atomized in the molten state by known methods, so that in each case one
  • FeRe composite powder is present. A particle size of about 25 ⁇ m is sieved out of the powder.
  • a corresponding amount of commercially available silver powder is then weighed into the alloy powder, so that a material with a mass fraction of 5.7 iron-rhenium and the rest silver is formed.
  • molded parts are pressed from the powder mixture into contact pieces at a pressure of approx. 200 MPa.
  • the molded parts are sintered at a temperature of approximately 850 ° C. for about an hour in a vacuum or under protective gas.
  • the sintered bodies are pressed at a pressure of approx. 1000 MPa and sintered again at approx. 650 oC for about an hour in a vacuum or under protective gas.
  • the contact pieces thus produced are again calibrated at a pressure of approx. 1000 MPa.
  • the proportions of silver and FeRe alloy can be varied using the same procedure. A material with 9, 9 parts by mass of FeRe20, the rest silver, was specifically examined.
  • Another process uses separate powders of iron, rhenium and silver as the starting material.
  • a powder mixture is prepared by wet mixing the individual powders. From the powder mixture, strips or wires of the material are first produced as semi-finished products using the so-called extrusion technique. The process conditions with regard to temperature on the one hand and pressure on the other hand are in the known order of magnitude. Contact pieces with a directional structure can then be separated from the semi-finished product thus produced.
  • the powder metallurgical method for producing the additional components three materials were produced in which the ratio of iron to rhenium is approximately 4: 1 or 9: 1. The total proportion of the additional components was selected as an alternative to 5.3 m%, 5.7 m% and 9.4 m%. Another material was made with a ratio of
  • the alloys or the powder mixtures can be produced by so-called mechanical alloying of single-component individual powders.
  • the structural properties of the finished material are advantageously influenced.
  • the table shows that in all five examples of the material according to the invention according to different methods or the contact pieces made therefrom, there are sufficient switching numbers, which are in each case more than 50,000. Such switching numbers cannot be achieved with silver-rhenium or pure silver.
  • the overtemperature in the switching device is decisive for the use of the switching material.
  • the latter can be at different points of the
  • Switching device are measured and is detected directly at the bridge in the present investigations. In this respect, the comparative examples must be observed.
  • pure silver or silver-rhenium 20 has a favorable overtemperature behavior with, however, low switching numbers.
  • AgFe9 shows such a high excess temperature that is no longer accepted in practice.
  • the high excess temperature can be explained by the formation of the cover layer, which increases the contact resistance and thus leads to increased heating at the contact.
  • all examples of the material according to the invention show that the excess temperature is reduced.
  • the values of pure silver or silver-rhenium are not reached, the order of magnitude permits the use of the material in switchgear. It must be taken into account that the maximum overtemperature values of the contact bridge are given in the first column. If you also take into account the average bridge temperatures according to the last column, you get extremely favorable values there.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Contacts (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Switches (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

En particulier pour des pièces de contact dans des interrupteurs à basse tension, le matériau de contact est en argent et autres constituants actifs. Selon l'invention, les constituants actifs sont une combinaison de fer (Fe) en proportion massique allant de 1 à 50 %, ainsi que de rhénium (Re) en proportion massique allant de 0,01 à 5 %. La production du matériau et la fabrication des pièces de contact peuvent se faire par des méthodes de métallurgie des poudres comprenant la technique de moulage ou d'extrusion, les constituants actifs étant utilisés sous forme de poudres séparées comme alliage de fusion ou comme poudre alliée mécaniquement.Particularly for contact parts in low voltage switches, the contact material is silver and other active constituents. According to the invention, the active constituents are a combination of iron (Fe) in a mass proportion ranging from 1 to 50%, as well as rhenium (Re) in a mass proportion ranging from 0.01 to 5%. The production of the material and the fabrication of the contact parts can be done by powder metallurgy methods including the molding or extrusion technique, the active constituents being used as separate powders as a melting alloy or as a mechanically alloyed powder. .

Description

Kontaktwerkstoff auf Silberbasis zur Verwendung in Silver based contact material for use in

Schaltgeräten der Energietechnik sowie Verfahren zur Switchgear in power engineering and processes for

Herstellung von Kontaktstücken aus diesem Werkstoff Manufacture of contact pieces from this material

Die Erfindung bezieht sich auf einen Kontaktwerkstoff auf Silberbasis zur Verwendung in Schaltgeräten der Energietechnik, insbesondere für Kontaktstücke in Niederspannungsschaltern, der neben Silber als weitere Wirkkomponenten wenigstens ein höher schmelzendes Metall, eine Metalllegierung oder eine Metallverbindung enthält. Darüber hinaus bezieht sich die Erfindung auch auf ein Verfahren zur Herstellung von Kontaktstücken aus einem derartigen Werkstoff. Für Kontaktstücke in Niederspannungsschaltgeräten der Energie- technik, z.B. in Leistungsschaltern sowie in Gleichstrom-, Motor- und Hilfsschützen, haben sich Kontaktwerkstoffe des Systems Silber- Metall (AgMe) seit langem bewährt. Vertreter dieses Systems sind beispiels- weise Silber-Nickel (AgNi) und Silber-Eisen (AgFe). The invention relates to a silver-based contact material for use in switchgear in power engineering, in particular for contact pieces in low-voltage switches, which, in addition to silver, contains at least one higher-melting metal, a metal alloy or a metal compound as further active components. In addition, the invention also relates to a method for producing contact pieces from such a material. For contact pieces in low-voltage switching devices in energy technology, e.g. In circuit breakers as well as in direct current, motor and auxiliary contactors, contact materials of the silver-metal system (AgMe) have proven themselves for a long time. Examples of this system are silver-nickel (AgNi) and silver-iron (AgFe).

Silber-Nickel hat vorteilhafte Kontakteigenschaften, die zusammen mit den Prüfmethoden für Kontaktwerkstoffe beispielsweise in INT.J. Powder Metallurgy and Powder Technology, Vol. 12 (1976), P 219 - 228 beschrieben sind. Nachteilig ist jedoch, daß insbesondere Nickelstaub schädliche Auswirkungen auf den menschlichen Organismus hat. Silver-nickel has advantageous contact properties which, together with the test methods for contact materials, for example in INT.J. Powder Metallurgy and Powder Technology, Vol. 12 (1976), P 219-228. However, it is disadvantageous that nickel dust in particular has harmful effects on the human organism.

Die Verwendung von Eisen in Kontaktwerkstoffen auf Silber-Basis ist verschiedendlich vorgeschlagen worden. Es hat sich jedoch gezeigt, daß Silber-Eisen noch nicht die gestellten Forderungen erfüllt, da bei Dauerstromführung derartiger Kontaktstücke eine zu hohe Erwärmung auftritt, die durch eine kontaktwiderstandserhöhende Deckschichtbildüng in diesem System erklärt werden kann. Weiterhin ist aus der DE-OS 3 813 311 (WO-A-89/10417) ein Sinterkontaktwerkstoff der eingangs genannten Art bekannt, αer neben Silber als Wirkkomponente wenigstens Eisen und/oder Titan enthält. Speziell dann, wenn das Eisen und das Titan in legierter Form vorliegen und eine intermetallische Verbindung bilden, wurden gute Ergebnisse bei Schaltversuchen beobachtet. Gegebenenfalls können dabei als weitere Wirkkomponenten Nitride, Karbide und/oder Boride von Metallen, insbesondere von Titan, vorhanden sein. The use of iron in silver-based contact materials has been proposed in various ways. It has it has been shown, however, that silver-iron does not yet meet the requirements, since excessive heating occurs when current is applied to such contact pieces, which can be explained by an increase in contact resistance in this system. Furthermore, from DE-OS 3 813 311 (WO-A-89/10417) a sintered contact material of the type mentioned at the outset is known, αer containing at least iron and / or titanium as the active component. Particularly when the iron and the titanium are in an alloyed form and form an intermetallic compound, good results have been observed in switching tests. Optionally, nitrides, carbides and / or borides of metals, in particular titanium, may be present as further active components.

Weiterhin wird mit der DE-C-38 16 895 die Verwenαung eines Silber-Eisen-Werkstcffes mit 3 bis 30 Gew.-% Eisen und einen oder mehreren der Zusätze Mangan, Kupfer, Zink, Antimon, Wismutoxid, Molybdänoxid, Wolframoxid, Chromnitrid in Mengen von insgesamt 0,05 bi 5 Gew.-%, Rest Silber für elektrische Kontakte vorgeschlagen. Schließlich ist aus der DE-A-39 11 904 ein pulvermetallurgisches Verfahren zum herstellen eines Halbzeugs für elektrische Kontakte aus einem Verbundwerkstoff auf Silberbasis mit Eisen bekannt, bei dem 5 bis 50 Gew.-% Eisen als erstem Nebenbestandteil und 0 bis 5 Gew.-% eines zweiten Nebenbestandteils aus einer oder mehreren Substanzen aus der Gruppe, welche die Metalle Titan, Zirkon, Niob, Tantal, Molybdän, Mangan, Kupfer und Zink sowie ihre Oxide und ihre Karbide enthält, verwendet werden. Furthermore, DE-C-38 16 895 describes the use of a silver-iron workpiece with 3 to 30% by weight of iron and one or more of the additives manganese, copper, zinc, antimony, bismuth oxide, molybdenum oxide, tungsten oxide, chromium nitride Quantities totaling 0.05 to 5% by weight, the rest silver proposed for electrical contacts. Finally, DE-A-39 11 904 discloses a powder metallurgical process for producing a semi-finished product for electrical contacts from a silver-based composite material with iron, in which 5 to 50% by weight of iron is the first secondary component and 0 to 5% by weight. % of a second minor component from one or more substances from the group containing the metals titanium, zirconium, niobium, tantalum, molybdenum, manganese, copper and zinc as well as their oxides and their carbides.

Ausgehend von obigem Stand der Technik ist es Aufgabe der Erfindung, einen weiteren Kontaktwerkstoff auf Silber-Ei sen-Basis und das zugehörige Herstellungsfahren aufzufinden. Der neue Werkstoff soll sich durch geringe Kontakterwärmung mit stabilem Erwärmungsverhalten, vertretbarer Verschweißneigung und eine hohe Lebensdauer in bezug auf vorgegebene Schaltstromstärken auszeichnen. Starting from the above prior art, the object of the invention is a further contact material on silver egg to find the sen base and the associated manufacturing process. The new material should be characterized by low contact heating with stable heating behavior, acceptable tendency to weld and a long service life in relation to the specified switching currents.

Die Aufgabe ist erfindungsgemäß bei einem Werkstoff der eingangs genannten Art dadurch gelöst, daß als Wirkkomponenten in Kombination Eisen in Massenanteilen zwischen 1 und 50 % und Rhenium in Massenanteilen zwischen 0,01 und 5 % vorliegen. Zur Fertigung von Kontaktstücken aus dem erfindungsgemäßen Werkstoff können das Eisen und das The object is achieved according to the invention in a material of the type mentioned at the outset that the active components in combination are iron in mass fractions between 1 and 50% and rhenium in mass fractions between 0.01 and 5%. To manufacture contact pieces from the material according to the invention, the iron and the

Rhenium in Form von Reinmetallen und/oder als Legierung dem Silber hinzugefügt sein, wobei die Herstellung des Werkstoffes pulvermetallurgisch erfolgt. Das Verhältnis der Massenanteile von Eisen zu Rhenium kann zwischen etwa 4:1 und etwa 20:1 liegen. Rhenium can be added to the silver in the form of pure metals and / or as an alloy, the material being produced by powder metallurgy. The ratio of the mass fractions of iron to rhenium can be between approximately 4: 1 and approximately 20: 1.

Im Rahmen vorliegender Erfindung wurde erkannt, daß speziell Rhenium in Kombination mit Eisen und Silber das Eigenschaftsspektrum als Kontaktwerkstoff verbessert. Die Verwendung von Rhenium in Kombination mit Silber wurde zwar bereits schon in der Fachliteratur vorgeschlagen. Dort wurde allerdings das Rhenium als einzige Komponente mit vergleichsweise hohem Anteil, beispielsweise um 20In the context of the present invention, it was recognized that especially rhenium in combination with iron and silver improves the property spectrum as a contact material. The use of rhenium in combination with silver has already been proposed in the specialist literature. There, however, the rhenium was the only component with a comparatively high proportion, for example around 20

Masseprozent, vorgesehen. Aufgrund des hohen Preises hat sich ein derartiger Werkstoff nicht durchsetzen können. Im Rahmen der Erfindung wurde nunmehr erkannt, daß Rhenium bereits als Minderkomponente einen Silber- Eisen-Werkstoff im erwünschten Maße verbessert. Percent by mass, provided. Due to the high price, such a material could not prevail. It has now been recognized in the context of the invention that rhenium, as a minor component, improves a silver-iron material to the desired extent.

In vorzugsweiser Weiterbildung der Erfindung wird der Eisengehalt erheblich geringer als 50 % liegen. Insbeson- dere wird bei einem derartigen Werkstoff das Eisen in Massenanteilen von 2 bis 25 % und das Rhenium in Massenanteilen von 0,1 bis 3 % vorliegen. Besonders vorteilhafte Ergebnisse haben Schaltversuche mit Kontaktwerkstoffen ergeben, bei denen das Eisen in Massenanteilen von 2 bis 10 % und das Rhenium in Massenanteilen von 0,1 bis 1 % vorliegen. Der Gesamtvolumenanteil der beiden Wirkkomponenten kann dabei in vergleichsweise weiten Grenzer schwanken. Beispielsweise liegt er bei 6, 12 oder 18 %. In a preferred development of the invention, the iron content will be considerably less than 50%. In particular With such a material, the iron will be present in mass fractions of 2 to 25% and the rhenium in mass fractions of 0.1 to 3%. Switching tests with contact materials in which the iron is in a mass fraction of 2 to 10% and the rhenium in a mass fraction of 0.1 to 1% have shown particularly advantageous results. The total volume fraction of the two active components can fluctuate within comparatively wide limits. For example, it is 6, 12 or 18%.

Weitere Einzelheiten und Vorteile der Erf indung ergeben sich aus der nachf olgenαen Beschreibung vor, Ausführungsbeispielen in Verbindung mit den weiteren Unteranspruchen. Dabei wird einerseits auf unterschiedliche Verfahren zur Herstellung des beanspruchten Werkstoffes und andererseits auf die beigefügte Tabelle mit Einzelbeispielen für konkrete Werkstoffzusammen- Setzungen gemäß der Erfindung eingegangen. In der Tabelle sind Meßwerte für die Übertemperatur αer beanspruchten Werkstoffe, die jeweils ar cer Kontakttrücke des Schaltgerätes gemessen wurden, angegeben. In der ersten Spalte αer Temperaturmeßwerte ist die maximale Uber- temDeratur (TÜ maX) und in der zweiter Spalte die mittlere Brückentemperatur enthalten, die sich jeweils alsFurther details and advantages of the invention result from the following description, exemplary embodiments in conjunction with the further subclaims. On the one hand, different methods for producing the claimed material and, on the other hand, on the attached table with individual examples for concrete material compositions according to the invention are discussed. The table shows measured values for the overtemperature αer stressed materials, which were measured in each case ar contact contact of the switching device. The maximum column temperature (T Ü maX ) is contained in the first column of the temperature measurements, and the average bridge temperature, which can be found as

Temperaturdifferenz zur Raumtemperatur ergeben. Die Temperaturmeßwerte wurden bei Versuchen mit einem 15 KW-Schütz bis zu einer Schaltzahl von ns = 50.000 Schaltungen ermittelt. Difference in temperature to room temperature. The temperature measured values were determined in tests with a 15 KW contactor up to a switching number of n s = 50,000 switching operations.

Die Tabelle umfaßt sechs Ausführungsbeispiele mit aussagekräftigen Zusammensetzungen des beanspruchten Silber-Eisen-Rhenium-Kontaktwerkstoffes. Dabei ist die Herstellung des eigentlichen Werkstoffes und die Fertigung der diesbezüglichen Kontaktstücke nach teilweise unterschiedlichen Methoden erfolgt. Die Meßwerte der einzelnen AgFeRe-Werkstoffe werden mit AgFe9 sowie AgRe20 und mit Reinsilber verglichen. Auf die Ergebnisse wird weiter unten im einzelnen eingegangen. The table comprises six exemplary embodiments with meaningful compositions of the claimed silver-iron-rhenium contact material. Here is the manufacture the actual material and the manufacture of the relevant contact pieces is carried out according to partly different methods. The measured values of the individual AgFeRe materials are compared with AgFe9 and AgRe20 and with pure silver. The results are discussed in more detail below.

Erstes Herstellungsverfahren: Zur Herstellung eines Kontaktwerkstoffes Ag(FeRe20)5,7 wird zunächst aus 80 Anteilen Eisen und 20 Anteilen First manufacturing process: To manufacture a contact material Ag (FeRe20) 5,7, 80 parts iron and 20 parts

Rhenium eine Eisen-Rhenium-Legierung erschmolzen. Diese Legierungsschmelze wird mittels bekannter Methoden im schmelzflüssigen Zustand verdüst, so daß jeweils ein Rhenium melted an iron-rhenium alloy. This alloy melt is atomized in the molten state by known methods, so that in each case one

FeRe-Verbundpulver vorliegt. Aus dem Pulver wird eine Teilchengröße von etwa 25 μm abgesiebt. FeRe composite powder is present. A particle size of about 25 μm is sieved out of the powder.

Dem Legierungspulver wird anschließend eine entsprechende Menge handelsüblichen Silber-Pulvers zugewogen, so daß ein Werkstoff mit Massenanteilen von 5,7 Eisen-Rhenium und Rest Silber entsteht. Nach Naßmischen über einen geeigneten Zeitraum werden aus der Pulvermischung Formteile bei einem Druck von ca. 200 MPa zu Kontaktstücken gepreßt. Für eine sichere Verbindungstechnik des Kontaktstückes mit dem Kontaktstückträger durch Hartlöten kann es vorteilhaft sein, bei diesem Preßvorgaπg eine zweite Schicht aus Reinsilber gemeinsam mit der eigentlichen Kontaktschicht zu einem Zweischichten-Kontaktstück zu verpressen. Es erfolgt eine Sinterung der Formteile bei einer Temperatur von ca. 850 ºC über etwa eine Stunde im Vakuum oder unter Schutzgas. Zur Erzielung einer möglichst geringen Porosität der fertigen Kontaktstücke werden anschließend die Sinterkörper bei einem Druck von ca. 1000 MPa nachgepreßt und nochmals bei ca. 650 ºC etwa eine Stunde im Vakuum oder unter Schutzgas gesintert. Das Kalibrieren der so hergestellten Kontaktstücke erfolgt wiederum bei einem Druck von ca. 1000 MPa. A corresponding amount of commercially available silver powder is then weighed into the alloy powder, so that a material with a mass fraction of 5.7 iron-rhenium and the rest silver is formed. After wet mixing for a suitable period of time, molded parts are pressed from the powder mixture into contact pieces at a pressure of approx. 200 MPa. For a secure connection technique of the contact piece to the contact piece carrier by brazing, it can be advantageous in this pressing operation to press a second layer of pure silver together with the actual contact layer into a two-layer contact piece. The molded parts are sintered at a temperature of approximately 850 ° C. for about an hour in a vacuum or under protective gas. To achieve the lowest possible porosity of the finished contact pieces are then the sintered bodies are pressed at a pressure of approx. 1000 MPa and sintered again at approx. 650 ºC for about an hour in a vacuum or under protective gas. The contact pieces thus produced are again calibrated at a pressure of approx. 1000 MPa.

Bei einem gleichen Vorgehen können die Anteile von Silber und FeRe-Legierung variiert werden. Untersucht wurde speziell ein Werkstoff mit 9 , 9 Massenanteilen FeRe20, Rest Silber. The proportions of silver and FeRe alloy can be varied using the same procedure. A material with 9, 9 parts by mass of FeRe20, the rest silver, was specifically examined.

Zweites Herstellungsverfahren: Second manufacturing process:

In einem anderen Verfahren werden separate Pulver aus Eisen, Rhenium und Silber als Ausgangsmaterial verwendet. Durch Naßmischen der Einzelpulver wird eine Pulvermischung zubereitet. Aus der Pulvermischung werden zunächst über die sogenannte Strangpreßtechnik Bänder oder Drähte des Werkstoffes als Halbzeug hergestellt. Die Verfahrensbedingungen hinsichtlich Temperatur einerseits und Druck andererseits liegen dabei in der bekannten Größenordnung. Von dem so erzeugten Halbzeug lassen sich dann Kontaktstücke mit Richtgefüge abtrennen. Mit der pulvermetallurgischen Methode zur Herstellung der Zusatzkomponenten wurden drei Werkstoffe hergestellt, bei denen das Verhältnis von Eisen zu Rhenium bei etwa 4 : 1 oder 9 : 1 liegt. Der Gesamtanteil der Zusatzkomponenten wurde alternativ zu 5,3 m % , 5,7 m % und 9,4 m % gewählt. Ein weiterer Werkstoff wurde mit einem Verhältnis vonAnother process uses separate powders of iron, rhenium and silver as the starting material. A powder mixture is prepared by wet mixing the individual powders. From the powder mixture, strips or wires of the material are first produced as semi-finished products using the so-called extrusion technique. The process conditions with regard to temperature on the one hand and pressure on the other hand are in the known order of magnitude. Contact pieces with a directional structure can then be separated from the semi-finished product thus produced. With the powder metallurgical method for producing the additional components, three materials were produced in which the ratio of iron to rhenium is approximately 4: 1 or 9: 1. The total proportion of the additional components was selected as an alternative to 5.3 m%, 5.7 m% and 9.4 m%. Another material was made with a ratio of

Eisen zu Rhenium von 19:1 und einem Gesamtanteil der Zusatzkomponenten von 8,8 m % hergestellt. Es ist auch möglich, die beispielhaft angegebenen unterschiedlichen Methoden bei der Herstellung der Zusatzkomponenten einerseits und der Herstellung der Kontakte andererseits in anderer Weise miteinander zu kombinieren. Iron to rhenium of 19: 1 and a total share of the additional components of 8.8 m%. It is also possible to combine the different methods given by way of example in the production of the additional components on the one hand and the production of the contacts on the other in a different way.

Insbesondere kann das Herstellen der Legierungen bzw. der Pulvermischungen durch sogenanntes mechanisches Legieren von einkomponentigen Einzelpulvern erfolgen. Dadurch werden die Gefügeeigenschaften des fertigen Werkstoffes vorteilhaft beeinflußt. In particular, the alloys or the powder mixtures can be produced by so-called mechanical alloying of single-component individual powders. As a result, the structural properties of the finished material are advantageously influenced.

Die Tabelle zeigt, daß bei allen fünf Beispielen des nach unterschiedlichen Verfahren erfindungsgemäßen Werkstoffes bzw. der daraus gefertigten Kontaktstücke hinreichende Schaltzahlen vorliegen, die in jedem Fall mehr als 50,000 betragen. Derartige Schaltzahlen sind bei Silber-Rhenium oder Reinsilber nicht erreichbar. The table shows that in all five examples of the material according to the invention according to different methods or the contact pieces made therefrom, there are sufficient switching numbers, which are in each case more than 50,000. Such switching numbers cannot be achieved with silver-rhenium or pure silver.

Maßgebend für die Verwenoung des Schaltwerkstoffes ist neben der reinen Schaltzahl die Übertemperatur im Schaltgerät. Letztere kann an unterschiedlichen Punkten desIn addition to the number of switching operations, the overtemperature in the switching device is decisive for the use of the switching material. The latter can be at different points of the

Schaltgerätes gemessen werden und wird bei vorliegender Untersuchungen direkt an der Brücke erfaßt. Insofern müssen die Vergleichsbeispiele beachtet werden. Switching device are measured and is detected directly at the bridge in the present investigations. In this respect, the comparative examples must be observed.

Wie zu erwarten ist, haben Reinsilber oαer Silber-Rhenium 20 ein günstiges Übertemperaturverhalten bei allerdings geringen Schaltzahlen. Dem gegenüber zeigt AgFe9 eine so hohe Übertemperatur, die in der Praxis nicht mehr akzeptiert wirc. Die hohe Übertemperatur läßt sich durch die Deckschichtbildung erläutern, welche den Kontaktwiderstand erhöht und damit zu verstärkter Erwärmung am Kontakt führt. Dem gegenüber zeigen alle Beispiele des erfindungsgemäßen Werkstoffes, daß die Übertemperatur herabgesenkt ist. Es werden zwar nicht die Werte von Reinsilber oder Silber-Rhenium erreicht, jedoch solche Größenordnungen, die eine Verwendung des Werkstoffes in Schaltgeräten erlaubt. Dabei muß berücksichtigt werden, daß in der ersten Spalte jeweils die maximalen Übertemperaturwerte der Kontaktbrücke angegeben sind. Berücksichtigt man darüber hinaus auch die mittleren Brückentemperaturen gemäß der letzten Spalte, so kommt man dort zu äußerst günstigen Werten. As can be expected, pure silver or silver-rhenium 20 has a favorable overtemperature behavior with, however, low switching numbers. In contrast, AgFe9 shows such a high excess temperature that is no longer accepted in practice. The high excess temperature can be explained by the formation of the cover layer, which increases the contact resistance and thus leads to increased heating at the contact. In contrast, all examples of the material according to the invention show that the excess temperature is reduced. Although the values of pure silver or silver-rhenium are not reached, the order of magnitude permits the use of the material in switchgear. It must be taken into account that the maximum overtemperature values of the contact bridge are given in the first column. If you also take into account the average bridge temperatures according to the last column, you get extremely favorable values there.

Der Vergleich des Werkstoffes mit dem Stand der Technik zeigt, daß die Kombination von Silber mit Eisen und Rhenium einen Werkstoff mit geringer Kontakterwärmung und stabilen Erwärmungsverhalten und hoher Lebensoauer in bezug auf die Schaltstromwerte realisiert. Damit ist eine beachtlicher Fortschritt gegenüber dem Stand der Technik erreicht. The comparison of the material with the prior art shows that the combination of silver with iron and rhenium realizes a material with low contact heating and stable heating behavior and high life cycle in relation to the switching current values. This represents a considerable advance over the state of the art.

Claims

Patentansprüche Claims 1. Kontaktwerkstoff auf Silberbasis zur Verwendung in Schaltgeräten der Energietechnik, insbesondere für Kontaktstücke in Niederspannungsschaltern, αer neben Silber als weitere Wirkkomponenten wenigstens ein höher schmelzendes Metall, eine Metallegierung oder eine Metallverbindung enthält, d a d u r c h g e k e n n z e i c h n e t , daß als Wirkkomponenten in Kombination Eisen (Fe) in Massenanteilen zwischen 1 und 50 % und Rhenium (Re) in Massenanteilen zwischen 0,01 und 5 % vorliegen. 1. Silver-based contact material for use in switchgear in energy technology, in particular for contact pieces in low-voltage switches, in addition to silver, as a further active component, contains at least one higher-melting metal, a metal alloy or a metal compound, characterized in that iron (Fe) is present in mass proportions as the active components in combination between 1 and 50% and rhenium (Re) in mass fractions between 0.01 and 5%. 2. Kontaktwerkstoff nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß Eisen (Fe) in Massenanteilen von weniger als 40 % vorliegt. 2. Contact material according to claim 1, d a d u r c h g e k e n n z e i c h n e t that iron (Fe) is present in mass fractions of less than 40%. 3. Kontaktwerkstoff nach Anspruch 2, d a d u r c h g e k e n n z e i c h n e t , daß Eisen (Fe) in Massenanteilen von weniger als 30 % vorliegt. 3. Contact material according to claim 2, d a d u r c h g e k e n n z e i c h n e t that iron (Fe) is present in mass fractions of less than 30%. 4. Kontaktwerkstoff nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß Rhenium (Re) in Massenanteilen von weniger als 4 % vorliegt. 5. Kontaktwerkstoff nach Anspruch 4, d a d u r c h g e k e n n z e i c h n e t , daß Rhenium (Re) in Massenanteilen von weniger als 3,4. Contact material according to claim 1, d a d u r c h g e k e n n z e i c h n e t that rhenium (Re) is present in mass fractions of less than 4%. 5. Contact material according to claim 4, d a d u r c h g e k e n n z e i c h n e t that rhenium (Re) in mass fractions of less than 3, 5 % vorliegt. 5% is present. 6. Kontaktwerkstoff nach Anspruch 1 oder einem der AnSprüche 2 bis 5, d a d u r c h g e k e n n z e i c h n e t , daß das Eisen (Fe) in Massenanteilen von 2 bis 25 % und das Rhenium (Re) in Massenanteilen von 0,1 bis 3 % vorliegen. 6. Contact material according to claim 1 or one of claims 2 to 5, characterized in that the iron (Fe) is in a mass fraction of 2 to 25% and the rhenium (Re) is in a mass fraction of 0.1 to 3%. 7. Kontaktwerkstoff nach Anspruch 6, d a d u r c h g e k e n n z e i c h n e t , daß das Eisen (Fe) in Massenanteilen von 2 bis 20 % und das Rhenium (Re) in Massenanteilen von 0,1 bis 2 % vorliegen. 7. Contact material according to claim 6, so that the iron (Fe) is in a mass fraction of 2 to 20% and the rhenium (Re) is in a mass fraction of 0.1 to 2%. 8. Kontaktwerkstoff nach Anspruch 7, d a d u r c h g e k e n n z e i c h n e t , daß das Eisen (Fe) in Massenanteilen von 2 bis 10 % und das Rhenium (Re) in Massenanteilen von 0,1 bis 1,0 % vorliegen. 8. Contact material according to claim 7, so that the iron (Fe) is present in mass fractions of 2 to 10% and the rhenium (Re) in mass fractions of 0.1 to 1.0%. 9. Kontaktwerkstoff nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , daß das Verhältnis der Massenanteile von Eisen (Fe) zu Rhenium (Re) zwischen 4:1 und 20:1, liegt. 9. Contact material according to one of the preceding claims, that the ratio of the mass fractions of iron (Fe) to rhenium (Re) is between 4: 1 and 20: 1. 10. Kontaktwerkstoff nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , daß der Volumenanteil der Wirkkomponenten zusammen bei etwa10. Contact material according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that the volume fraction of the active components together at about 6 % liegt. 6% lies. 11. Kontaktwerkstoff nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , daß der Volumenanteil beider Wirkkomponenten zusammen bei etwa 12 % liegt. 11. Contact material according to one of the preceding claims, that the volume fraction of both active components together is approximately 12%. 12. Kontaktwerkstoff nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , daß der Volumenanteil der Wirkkomponenten zusammen bei etwa12. Contact material according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that the volume fraction of the active components together at about 18 % liegt. Is 18%. 13. Verfahren zur Herstellung von Kontaktstücken aus einem Werkstoff nach Anspruch 1 oder einem der Ansprüche 2 bis 12, d a d u r c h g e k e n n z e i c h n e t , daß die Herstellung pulvermetallurgisch erfolgt, wobei zunächst aus Eisen und Rhenium eine Legierung hergestellt wird, die zu einem Legierungspulver verdüst, und wobei aus Silberpulver und und dem Legierungspulver - gegebenenfalls über ein Halbzeug - die Kontaktstücke gefertigt werden. 13. A method for producing contact pieces from a material according to claim 1 or one of claims 2 to 12, characterized in that the production is carried out by powder metallurgy, an alloy being first produced from iron and rhenium, which atomizes into an alloy powder, and the contact pieces are produced from silver powder and and the alloy powder - optionally via a semi-finished product. 14. Verfahren nach Anspruch 13, d a d u r c h g e k e n n z e i c h n e t , daß das Herstellen der FeRe- Legierung durch Erschmelzen im Vakuum oder Schutzgas erfolgt. 14. The method according to claim 13, d a d u r c h g e k e n n z e i c h n e t that the production of the FeRe alloy is carried out by melting in a vacuum or protective gas. 15. Verfahren nach Anspruch 13, d a d u r c h g e k e n n z e i c h n e t , daß das Herstellen der FeRe- Legierung durch mechanisches Legieren im Vakuum oder 15. The method of claim 13, d a d u r c h g e k e n n z e i c h n e t that the manufacture of the FeRe alloy by mechanical alloying in a vacuum or Schutzgas erfolgt. Shielding gas takes place. 16. Verfahren zur Herstellung von Kontaktstücken aus einem Werkstoff gemäß Anspruch 1 oder einem der Ansprüche 2 bis 12, d a d u r c h g e k e n n z e i c h n e t , daß die Herstellung pulvermetallurgisch erfolgt, wobei separate Pulver aus Silber, Eisen und Rhenium verwendet werden, aus denen - gegebenenfalls über ein Halbzeug - die Kontaktstücke gefertigt werden. 16. A method for producing contact pieces from a material according to claim 1 or one of claims 2 to 12, characterized in that the production is carried out by powder metallurgy, wherein separate powders of silver, iron and rhenium are used, from which - optionally via a semi-finished product - the Contact pieces are manufactured. 17. Verfahren zur Herstellung von Kontaktstücken aus einem Werkstoff gemäß Anspruch 1 oder einem der Ansprüche 2 bis 12, d a d u r c h g e k e n n z e i c h n e t , daß die Herstellung pulvermetallurgisch erfolgt, wobei separate Pulver aus Silber, Eisen und Rhenium mechanisch legiert werden, woraus - gegebenenfalls über ein Halbzeug - die Kontaktstücke gefertigt werden. 17. A method for producing contact pieces from a material according to claim 1 or one of claims 2 to 12, characterized in that the production is carried out by powder metallurgy, separate powders of silver, iron and rhenium being mechanically alloyed, from which - optionally via a semi-finished product - the Contact pieces are manufactured. 18. Verfahren nach einem der Ansprüche 13, 16 oder 17, d a d u r c h g e k e n n z e i c h n e t , daß die Fertigung der Koπtaktstücke durch eine Formteiltechnik erfolgt. 18. The method according to any one of claims 13, 16 or 17, characterized in that the production of the contact pieces is carried out by a molding technique. 19. Verfahren nach einem der Ansprüche 13, 16 oder 17, d a d u r c h g e k e n n z e i c h n e t , daß die Fertigung der Kontaktstücke durch Strangpressen erfolgt, wozu zunächst aus dem Pulvern ein stranggepreßtes Halbzeug hergestellt wird, von dem Kontaktstücke abtrennbar sind. 19. The method according to any one of claims 13, 16 or 17, that the contact pieces are manufactured by extrusion molding, for which purpose an extruded semi-finished product is first produced from the powder, from which contact pieces can be separated.
EP92909684A 1991-05-27 1992-05-13 Silver-based contact material for use in power-engineering switchgear, and a method of manufacturing contacts made of this material Expired - Lifetime EP0586411B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4117312 1991-05-27
DE4117312A DE4117312A1 (en) 1991-05-27 1991-05-27 SILVER-BASED CONTACT MATERIAL FOR USE IN SWITCHGEAR DEVICES OF ENERGY TECHNOLOGY AND METHOD FOR THE PRODUCTION OF CONTACT PIECES FROM THIS MATERIAL
PCT/DE1992/000384 WO1992022079A1 (en) 1991-05-27 1992-05-13 Silver-based contact material for use in power-engineering switchgear, and a method of manufacturing contacts made of this material

Publications (2)

Publication Number Publication Date
EP0586411A1 true EP0586411A1 (en) 1994-03-16
EP0586411B1 EP0586411B1 (en) 1995-07-19

Family

ID=6432545

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92909684A Expired - Lifetime EP0586411B1 (en) 1991-05-27 1992-05-13 Silver-based contact material for use in power-engineering switchgear, and a method of manufacturing contacts made of this material

Country Status (9)

Country Link
US (1) US5422065A (en)
EP (1) EP0586411B1 (en)
JP (1) JP3280967B2 (en)
AT (1) ATE125389T1 (en)
BR (1) BR9206059A (en)
DE (2) DE4117312A1 (en)
DK (1) DK0586411T3 (en)
ES (1) ES2074363T3 (en)
WO (1) WO1992022079A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0774523A1 (en) 1995-11-20 1997-05-21 Degussa Aktiengesellschaft Silver-iron material for electrical switch contacts
WO1997027601A3 (en) * 1996-01-26 1997-10-09 Siemens Ag Method of producing a shaped part from a silver-based contact material

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4205763A1 (en) * 1992-02-25 1993-08-26 Siemens Ag SILVER-BASED SINTER CONTACT MATERIAL FOR USE IN SWITCHGEAR OF ENERGY TECHNOLOGY
JP3467527B2 (en) * 1992-12-17 2003-11-17 株式会社山王 Contact material and method of manufacturing the same
DE4344322A1 (en) * 1993-12-23 1995-06-29 Siemens Ag Sintered contact material
DE19543208C1 (en) * 1995-11-20 1997-02-20 Degussa Silver@-iron@ material contg. oxide additives
DE19543222C1 (en) * 1995-11-20 1997-02-20 Degussa Silver@-iron material contg. oxide additives
DE19607183C1 (en) * 1996-02-27 1997-04-10 Degussa Sintered silver@-iron@ alloy for making electrical contacts
DE19608490C1 (en) * 1996-03-05 1997-09-04 Siemens Ag Contact material made of silver and active components, molded part made therefrom and process for producing the molded part
US5831186A (en) * 1996-04-01 1998-11-03 Square D Company Electrical contact for use in a circuit breaker and a method of manufacturing thereof
CN105463235A (en) * 2015-12-23 2016-04-06 四川飞龙电子材料有限公司 Preparation method for silver-iron-rhenium electric contact material
CN107299244B (en) * 2017-06-09 2019-07-16 佛山通宝精密合金股份有限公司 A method of preparing high-performance AgFeRe material

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE747830C (en) * 1941-06-17 1945-01-20 Use of gold alloys for electrical contacts
US2365249A (en) * 1942-07-21 1944-12-19 Baker & Co Inc Electrical contact element
DE888178C (en) * 1943-04-04 1953-08-31 Degussa Contact material made of metals with good electrical conductivity and a hard material component produced by powder metallurgy
DE1086441B (en) * 1958-07-15 1960-08-04 Degussa Use of palladium-rhenium alloys as a material for electrical contacts
US3310718A (en) * 1964-04-07 1967-03-21 Nytronics Inc Impedance element with alloy connector
US3511953A (en) * 1968-06-06 1970-05-12 Guardian Electric Mfg Co Silver rhenium electric contacts
US4081644A (en) * 1972-06-29 1978-03-28 Plessey Handel Investments A.G. Electrical contact material
GB2203167B (en) * 1987-03-25 1990-11-28 Matsushita Electric Works Ltd Composite conductive material and method for manufacturing same
DE3816895A1 (en) * 1987-06-06 1988-12-22 Degussa Use of a silver-iron material for electric contacts
YU46258B (en) * 1987-06-06 1993-05-28 Degussa Ag. APPLICATION OF SILVER IRON MATERIAL FOR ELECTRICAL CONTACTS
DE3802811A1 (en) * 1988-01-30 1989-08-10 Starck Hermann C Fa AGGLOMERED METAL COMPOSITE POWDER, METHOD FOR THE PRODUCTION AND USE THEREOF
DE58909449D1 (en) * 1988-04-16 1995-11-02 Duerrwaechter E Dr Doduco Powder metallurgical process for producing a semi-finished product for electrical contacts from a composite material based on silver with iron.
DE3911904A1 (en) * 1988-04-16 1989-12-14 Duerrwaechter E Dr Doduco Powder-metallurgical process for producing a semifinished product for electric contacts from a silver-based composite with iron
WO1989010417A1 (en) * 1988-04-20 1989-11-02 Siemens Aktiengesellschaft Sintered contact material based on silver for use in power engineering switchgear, in particular for contact pieces in low-voltage switches

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9222079A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0774523A1 (en) 1995-11-20 1997-05-21 Degussa Aktiengesellschaft Silver-iron material for electrical switch contacts
WO1997027601A3 (en) * 1996-01-26 1997-10-09 Siemens Ag Method of producing a shaped part from a silver-based contact material

Also Published As

Publication number Publication date
BR9206059A (en) 1994-12-20
ATE125389T1 (en) 1995-08-15
US5422065A (en) 1995-06-06
ES2074363T3 (en) 1995-09-01
DE59202973D1 (en) 1995-08-24
DK0586411T3 (en) 1995-12-04
DE4117312A1 (en) 1992-12-03
WO1992022079A1 (en) 1992-12-10
JP3280967B2 (en) 2002-05-13
EP0586411B1 (en) 1995-07-19
JPH06507446A (en) 1994-08-25

Similar Documents

Publication Publication Date Title
DE69032065T2 (en) Composite of silver and metal oxide and method of manufacturing the same
DE2411322C2 (en) Silver metal oxide material for electrical contacts
EP0586410B1 (en) Silver-based contact material for use in power-engineering switchgear, and a method of manufacturing contacts made of this material
EP0586411B1 (en) Silver-based contact material for use in power-engineering switchgear, and a method of manufacturing contacts made of this material
DE19903619C1 (en) Powder metallurgical composite material, especially for high voltage vacuum switch contacts, comprises refractory solid solution or intermetallic phase grains embedded in a metal matrix
EP0170812B1 (en) Method for the manufacture of sintered contact material
EP0414709B1 (en) Sintered contact material based on silver for use in power engineering switchgear, in particular for contact pieces in low-voltage switches
EP0774529B1 (en) Silver-iron material for electrical switch contacts
EP0725154B1 (en) Sintered material based on silver-tinoxide for electrical contacts and process for its production
DE3027732A1 (en) CONTACT FOR A VACUUM CIRCUIT BREAKER
EP0715765B1 (en) Silver-based contact material, use of such a contact material in switchgear for power-engineering applications and method of manufacturing the contact material
EP0152606A2 (en) Contact material and production of electric contacts
DE2920014C2 (en)
EP0795367A1 (en) Silver-iron material for electrical switch contacts and process for its preparation
DE69330598T2 (en) Contact material for vacuum switches and manufacturing processes therefor
EP0369283B1 (en) Sintered contact material for low-tension switchgear, particularly for contactors
EP0164664A2 (en) Sintered contact material for low-tension energy switchgear
DE1930859A1 (en) Powder metal compositions and processes for their preparation
DE3785372T2 (en) Contact material for vacuum switches.
EP0774524A1 (en) Silver-iron material for electrical switch contacts
EP0338401A1 (en) Powder-metallurgical process for the production of a semi-finished product for electrical contacts made from a composite material based on silver and iron
EP1043409A2 (en) Composite material prepared by powder metallurgy
EP0916146B1 (en) Method of producing a product from a silver-based contact material, contact material and product produced therefrom
WO1989009838A1 (en) Process for producing alloys resistant to tarnishing, oxidation and scaling
DE10012250B4 (en) Contact materials based on silver-iron-copper

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19931020

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT CH DE DK ES FR GB IT LI SE

17Q First examination report despatched

Effective date: 19941026

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT CH DE DK ES FR GB IT LI SE

REF Corresponds to:

Ref document number: 125389

Country of ref document: AT

Date of ref document: 19950815

Kind code of ref document: T

REF Corresponds to:

Ref document number: 59202973

Country of ref document: DE

Date of ref document: 19950824

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2074363

Country of ref document: ES

Kind code of ref document: T3

ITF It: translation for a ep patent filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19950922

ET Fr: translation filed
REG Reference to a national code

Ref country code: DK

Ref legal event code: T3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19980506

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DK

Payment date: 19980515

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19980519

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19980810

Year of fee payment: 7

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732E

REG Reference to a national code

Ref country code: FR

Ref legal event code: TQ

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990513

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990514

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990531

Ref country code: DK

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990531

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990531

REG Reference to a national code

Ref country code: ES

Ref legal event code: PC2A

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

EUG Se: european patent has lapsed

Ref document number: 92909684.0

REG Reference to a national code

Ref country code: DK

Ref legal event code: EBP

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

REG Reference to a national code

Ref country code: FR

Ref legal event code: TQ

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050513

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20081120

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20090825

Year of fee payment: 18

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20100129

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090602

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20101201

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20110615

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20110512

Year of fee payment: 20

REG Reference to a national code

Ref country code: GB

Ref legal event code: PE20

Expiry date: 20120512

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20120512

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20121207

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20120514