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EP0414709B1 - Sintered contact material based on silver for use in power engineering switchgear, in particular for contact pieces in low-voltage switches - Google Patents

Sintered contact material based on silver for use in power engineering switchgear, in particular for contact pieces in low-voltage switches Download PDF

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Publication number
EP0414709B1
EP0414709B1 EP89904519A EP89904519A EP0414709B1 EP 0414709 B1 EP0414709 B1 EP 0414709B1 EP 89904519 A EP89904519 A EP 89904519A EP 89904519 A EP89904519 A EP 89904519A EP 0414709 B1 EP0414709 B1 EP 0414709B1
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Prior art keywords
silver
contact material
contact
metal
titanium
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EP89904519A
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German (de)
French (fr)
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EP0414709A1 (en
Inventor
Wolfgang Haufe
Joachim Dipl.-Phys. Grosse
Bernhard Rothkegel
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Siemens AG
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Siemens AG
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/0466—Alloys based on noble metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/05—Mixtures of metal powder with non-metallic powder
    • C22C1/059—Making alloys comprising less than 5% by weight of dispersed reinforcing phases
    • 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 sintered contact material based on silver for use in switching devices in power engineering, in particular for contact pieces in low-voltage switches, consisting of silver and other active components, which comprise a higher melting metal, a metal alloy and / or a metal compound as an active component.
  • switching devices in energy technology are to be understood exclusively as air switching devices.
  • contact materials of the silver-metal system have proven themselves for a long time.
  • the silver-nickel (AgNi) system had a significant share of these contact materials.
  • the advantageous properties of silver-nickel in contact systems are known and together with the test methods for contact materials, for example in Int. J. Powder Metallurgy and Powder Technology, Vol. 12 (1976), P 219-228.
  • JP-A-589 952 discloses a silver-based sintered contact material which, in addition to silver, comprises at least one nitride from the group of the metals titanium (Ti), zirconium (Zr), niobium (Nb), Chromium (Cr), molybdenum (Mo), manganese (Mn), iron (Fe), vanadium (V) or tantalum (Ta), also a metal from the group of nickel (Ni), iron (Fe) or cobalt (Co ) and in particular contains graphite.
  • JP-A-627 7439 describes a contact material for vacuum switches which, in addition to silver (Ag) and / or copper (Cu) as the base material, an auxiliary metal from the group of cobalt (Co), iron (Fe) and nickel ( Ni) has other high-melting components such as WC, MoC, Cr3C2, TiC, W, Mo, Cr and Ti.
  • the object of the invention is to provide a contact material of the type mentioned in the introduction, in which the nickel as active component in particular is replaced by a metal, a metal alloy or a metal compound without the contact properties being impaired.
  • the total proportion of all active components can preferably be less than 20%.
  • Iron (Fe) and titanium (Ti) in particular can be present in a mass fraction of approximately 54 to 46% and form the intermetallic compound FeTi.
  • Suitable metals for the nitrides and / or carbides and / or borides as possible further active components are, in particular, titanium, but also zirconium or tantalum.
  • the proportion of base components can be increased, ie the necessary proportion of silver can be reduced.
  • the material can contain the base components in mass fractions up to a maximum of 50%.
  • the table shows measured values for the maximum welding force in N, for the volume erosion in mm3 and for the contact resistance in m.
  • these measured values each characterize the property spectrum of the contact material, with the volume erosion in particular being a significant measure of the possible number of switching operations of the contact, i.e. the service life of the contact piece and the contact resistance is a significant measure of the excess temperature at the contact piece.
  • the measured values are compared with the measured values for AgNilO.
  • a powder mixture is first produced from commercially available silver powder and iron or titanium powder or FeTi alloy powder and the powders of the other components by wet mixing.
  • the maximum particle size of the powder is about 25 ⁇ m.
  • Molded parts are pressed from the powder mixture into contact pieces at a pressure of 200 MPa.
  • the molded parts are sintered at a temperature of about 850 ° C. for about an hour in a vacuum or under protective gas.
  • the sintered bodies are subsequently pressed at a pressure of 1000 MPa and sintered again at 650 ° C. for about an hour in a vacuum or under a protective gas.
  • the contact piece thus produced is again calibrated at a pressure of 1000 MPa.
  • contact pieces can be manufactured by first processing the contact material into strips or wires by extrusion. Contact pieces with a directional structure can then be separated from this semi-finished product.
  • iron-titanium alloy powders were used.
  • Optimal properties are available with a FeTi46 alloy in which iron and titanium form the intermetallic phase FeTi. Titanium in particular counteracts the tendency of iron to corrode, which could otherwise have a disruptive effect on the contact piece on the iron over a longer service life.
  • composition of the active component was predominantly chosen so that approximately a volume fraction corresponding to the nickel in the material AgNilO is achieved.
  • titanium nitrides and / or titanium carbides are added to the FeTi46 alloy. Their mass fractions are measured so that they are between 1 and 50% based on the iron-titanium content. Overall, in the examples, care is taken that the material contains a maximum of 50% base components in mass fractions.
  • the welding force of the volume burnup and the contact resistance were determined in a known manner in a test switch under constant test conditions at an inrush current of 1000 A and an off current of 1000 A using a switching number of 500.
  • the results are summarized in the table and are compared with the measured values of a conventional AgNilO material.
  • the table shows that the maximum welding force in all examples is not significantly higher than that of the known AgNilO reference material.
  • the volume burn-off on the other hand, is consistently below that of the reference material.
  • the contact resistance is of the same order of magnitude, sometimes even at higher values.
  • the range of contact properties formed by the combination of the individual values shows values comparable with AgNilO.
  • the specified contact materials can therefore replace the AgNi materials, so that the carcinogenic nickel can now be completely dispensed with.
  • borides can also be used as additional active components.
  • zirconium or tantalum boride can be expected to have good properties, it being possible in each case to combine borides with carbides and / or nitrides.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Composite Materials (AREA)
  • Dispersion Chemistry (AREA)
  • Contacts (AREA)
  • Powder Metallurgy (AREA)

Abstract

A contact material contains silver and at least one metal, metal alloy or metallic compound having a higher melting point than silver. According to the invention, the material contains, in addition to silver (Ag), from 2 to 50 % of at least iron (Fe) and/or titanium (Ti). It may also contain nitrides, carbides and/or borides of the metals titanium, zirconium and/or tantalum. The material possesses a spectrum of contact properties essentially identical to that of AgNi10, and can completely replace the latter.

Description

Die Erfindung bezieht sich auf einen Sinterkontaktwerkstoff auf Silberbasis zur Verwendung in Schaltgeräten der Energietechnik, insbesondere für Kontaktstücke in Niederspannungsschaltern, bestehend aus Silber und weiteren Wirkkomponenten, die ein höherschmelzendes Metall, eine Metallegierung und/oder eine Metallverbindung als Wirkkomponente umfassen. Unter Schaltgeräten der Energietechnik sind in vorliegendem Fall ausschließlich Luftschaltgeräte zu verstehen.The invention relates to a sintered contact material based on silver for use in switching devices in power engineering, in particular for contact pieces in low-voltage switches, consisting of silver and other active components, which comprise a higher melting metal, a metal alloy and / or a metal compound as an active component. In the present case, switching devices in energy technology are to be understood exclusively as air switching devices.

Für Kontaktstücke in Schaltgeräten der Energietechnik, z.B. in Leistungsschaltern sowie in Gleichstrom- und Hilfsschützen, haben sich Kontaktwerkstoffe des Systems Silber-Metall (AgMe) seit langem bewährt. Einen wesentlichen Anteil an diesen Kontaktwerkstoffen hat in der Vergangenheit das System Silber-Nickel (AgNi) gehabt. Die vorteilhaften Eigenschaften von Silber-Nickel in Kontaktsystemen sind bekannt und zusammen mit den Prüfmethoden für Kontaktwerkstoffe beispielsweise in Int. J. Powder Metallurgy and Powder Technology, Vol. 12 (1976), P 219 - 228 beschrieben.For contact pieces in switching devices in energy technology, e.g. In circuit breakers as well as in direct current and auxiliary contactors, contact materials of the silver-metal system (AgMe) have proven themselves for a long time. In the past, the silver-nickel (AgNi) system had a significant share of these contact materials. The advantageous properties of silver-nickel in contact systems are known and together with the test methods for contact materials, for example in Int. J. Powder Metallurgy and Powder Technology, Vol. 12 (1976), P 219-228.

Es wurde aber vor einiger zeit erkannt, daß Nickelstaub karzinogene Wirkungen hat. Deshalb sind Bestrebungen im Gange, für Schützanwendungen das Nickel durch ein anderes Metall oder eine Metallegierung bzw. eine Metallverbindung zu ersetzen. Diese neuen Werkstoffe müssen jedoch ein ähnliches Kontakteigenschaftsspektrum wie AgNi-Werkstoffe aufweisen.However, it was recognized some time ago that nickel dust has carcinogenic effects. For this reason, efforts are underway to replace nickel with another metal or metal alloy or metal compound for contactor applications. However, these new materials must have a similar range of contact properties as AgNi materials.

Aus der JP-A-589 952 ist ein Sinterkontaktwerkstoff auf Silberbasis bekannt, der neben Silber wenigstens ein Nitrid aus der Gruppe der Metalle Titan (Ti), Zirkon (Zr), Niob (Nb), Chrom (Cr), Molybdän (Mo), Mangan (Mn), Eisen (Fe), Vanadium (V) oder Tantal (Ta), weiterhin ein Metall aus der Gruppe von Nickel (Ni), Eisen (Fe) oder Kobalt (Co) sowie insbesondere Graphit enthält. Schließlich wird in der JP-A-627 7439 ein Kontaktwerkstoff für Vakuumschalter beschrieben, der neben Silber (Ag) und/oder Kupfer (Cu) als Grundwerkstoff, einem Hilfsmetall aus der Gruppe von Kobalt (Co), Eisen (Fe) und Nickel (Ni) weitere hochschmelzende Komponenten wie WC, MoC, Cr₃C₂, TiC, W, Mo, Cr und Ti hat.JP-A-589 952 discloses a silver-based sintered contact material which, in addition to silver, comprises at least one nitride from the group of the metals titanium (Ti), zirconium (Zr), niobium (Nb), Chromium (Cr), molybdenum (Mo), manganese (Mn), iron (Fe), vanadium (V) or tantalum (Ta), also a metal from the group of nickel (Ni), iron (Fe) or cobalt (Co ) and in particular contains graphite. Finally, JP-A-627 7439 describes a contact material for vacuum switches which, in addition to silver (Ag) and / or copper (Cu) as the base material, an auxiliary metal from the group of cobalt (Co), iron (Fe) and nickel ( Ni) has other high-melting components such as WC, MoC, Cr₃C₂, TiC, W, Mo, Cr and Ti.

Aufgabe der Erfindung ist es demgegenüber, einen Kontaktwerkstoff der eingangs genannten Art anzugeben, bei dem speziell das Nickel als Wirkkomponente durch ein Metall, eine Metalllegierung oder eine Metallverbindung ersetzt ist, ohne daß die Kontakteigenschaften verschlechtert werden.In contrast, the object of the invention is to provide a contact material of the type mentioned in the introduction, in which the nickel as active component in particular is replaced by a metal, a metal alloy or a metal compound without the contact properties being impaired.

Die Aufgabe ist erfindungsgemäß durch einen Werkstoff folgender Zusammensestzung gelöst:

  • mindesten Eisen (Fe) und Titan (Ti), die in legierter Form als Hauptwirkkomponenten vorliegen,
  • wahlweise Nitride und/oder Carbide und/oder Boride von Metallen als weitere Wirkkomponenten, wobei
  • die weiteren Wirkkomponenten in Massenanteilen bis zu 50 % bezogen auf den Anteil von Eisen und Titan umfassen und
  • der Anteil aller Wirkkomponenten am Werkstoff in Massenanteilen zwischen 2 und 50 % liegt und
  • als Rest jeweils Silber vorhanden ist.
According to the invention, the object is achieved by a material having the following composition:
  • at least iron (Fe) and titanium (Ti), which are in alloyed form as the main active components,
  • optionally nitrides and / or carbides and / or borides of metals as further active components, where
  • the further active components in mass fractions up to 50% based on the proportion of iron and titanium and
  • the proportion of all active components in the material in mass fractions is between 2 and 50% and
  • the remainder is silver.

Der Gesamtanteil aller Wirkkomponenten kann vorzugsweise kleiner als 20 % sein. Insbesondere Eisen (Fe) und Titan (Ti) können speziell in Massenanteilen von etwa 54 zu 46 % vorliegen und die intermetallische Verbindung FeTi bilden. Als Metalle für die Nitride und/oder Carbide und/oder Boride als mögliche weitere Wirkkomponenten kommt insbesondere Titan, aber auch Zirkon oder Tantal in Frage. Durch die Nitrile, Carbide und/oder Boride läßt sich der Anteil der unedlen Bestandteile vergrößern, d.h. den notwendigen Silberanteil verringern. Insgesamt kann der Werkstoff die unedlen Bestandteile in Massenanteilen bis maximal 50 % enthalten.The total proportion of all active components can preferably be less than 20%. Iron (Fe) and titanium (Ti) in particular can be present in a mass fraction of approximately 54 to 46% and form the intermetallic compound FeTi. Suitable metals for the nitrides and / or carbides and / or borides as possible further active components are, in particular, titanium, but also zirconium or tantalum. Through the nitriles, carbides and / or borides, the proportion of base components can be increased, ie the necessary proportion of silver can be reduced. Overall, the material can contain the base components in mass fractions up to a maximum of 50%.

Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispieles zur Herstellung von Kontaktstücken, wobei weiterhin auf die beigefügte Tabelle mit Einzelbeispielen für unterschiedliche Werkstoffzusammensetzungen gemäß der Erfindung hingewiesen wird.Further details and advantages of the invention result from the following description of an exemplary embodiment for producing contact pieces, reference being further made to the attached table with individual examples for different material compositions according to the invention.

In der Tabelle sind Meßwerte für die maximale Schweißkraft in N, für den Volumenabbrand in mm³ und für den Kontaktwiderstand in m angegeben. Diese Meßwerte kennzeichnen in Kombination jeweils das Eigenschaftsspektrum des Kontaktwerkstoffes, wobei insbesondere der Volumenabbrand ein signifikantes Maß für die mögliche Schaltzahl des Kontaktes, d.h. der Lebensdauer des Kontaktstückes und der Kontaktwiderstand ein signifikantes Maß für die Übertemperatur am Kontaktstück ist. Die Meßwerte werden jeweils mit den Meßwerten für AgNilO verglichen.The table shows measured values for the maximum welding force in N, for the volume erosion in mm³ and for the contact resistance in m. In combination, these measured values each characterize the property spectrum of the contact material, with the volume erosion in particular being a significant measure of the possible number of switching operations of the contact, i.e. the service life of the contact piece and the contact resistance is a significant measure of the excess temperature at the contact piece. The measured values are compared with the measured values for AgNilO.

Zur Herstellung des Kontaktwerkstoffes wird zunächst aus handelsüblichem Silber-Pulver und Eisen- bzw. Titan-Pulver oder FeTi-Legierungspulver sowie den Pulvern der weiteren Komponenten durch Naßmischen eine Pulvermischung hergestellt. Die maximale Teilchengröße der Pulver beträgt etwa 25 µm. Aus der Pulvermischung werden Formteile bei einem Druck von 200 MPa zu Kontaktstücken gepreßt. Für eine sichere Verbindungstechnik des Kontaktstückes mit dem Kontaktstückträger durch Hartlöten kann es vorteilhaft sein, bei diesem Preßvorgang eine zweite Schicht aus Reinsilber gemeinsam mit der Kontaktschicht zu einem Zweischichtenkontaktstück zu verpressen.To produce the contact material, a powder mixture is first produced from commercially available silver powder and iron or titanium powder or FeTi alloy powder and the powders of the other components by wet mixing. The maximum particle size of the powder is about 25 µm. Molded parts are pressed from the powder mixture into contact pieces at a pressure of 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 process to press a second layer of pure silver together with the contact layer into a two-layer contact piece.

Es erfolgt eine Sinterung der Formteile bei einer Temperatur von etwa 850°C etwa eine Stunde im Vakuum oder unter Schutzgas. zur Erzielung einer möglichst geringen Porosität werden anschließend die Sinterkörper bei einem Druck von 1000 MPa nachgepreßt und nochmals bei 650°C etwa eine Stunde im Vakuum oder unter Schutzgas gesintert. Das Kalibrieren des so hergestellten Kontaktstückes erfolgt wiederum bei einem Druck von 1000 MPa.The molded parts are sintered at a temperature of about 850 ° C. for about an hour in a vacuum or under protective gas. To achieve the lowest possible porosity, the sintered bodies are subsequently pressed at a pressure of 1000 MPa and sintered again at 650 ° C. for about an hour in a vacuum or under a protective gas. The contact piece thus produced is again calibrated at a pressure of 1000 MPa.

Alternativ zur Formteiltechnik können Kontaktstücke dadurch hergestellt werden, daß zunächst der Kontaktwerkstoff durch Strangpressen zu Bändern oder Drähten verarbeitet wird. Von diesem Halbzeug lassen sich dann Kontaktstücke mit Richtgefüge abtrennen.As an alternative to molding technology, contact pieces can be manufactured by first processing the contact material into strips or wires by extrusion. Contact pieces with a directional structure can then be separated from this semi-finished product.

In Versuchsreihen wurde außer mit reinem Fe-Pulver bzw. Ti-Pulver insbesondere mit Eisen-Titan-Legierungspulvern gearbeitet. Optimale Eigenschaften liegen bei einer FeTi46-Legierung vor, bei der Eisen und Titan die intermetallische Phase FeTi bilden. Dabei wirkt insbesondere das Titan der Korrosionsneigung von Eisen entgegen, die sich ansonsten über eine längere Lebensdauer des Kontaktstückes am Eisen störend bemerkbar machen könnte.In series of tests, in addition to pure Fe powder or Ti powder, in particular iron-titanium alloy powders were used. Optimal properties are available with a FeTi46 alloy in which iron and titanium form the intermetallic phase FeTi. Titanium in particular counteracts the tendency of iron to corrode, which could otherwise have a disruptive effect on the contact piece on the iron over a longer service life.

Bei den Beispielen wurde die Zusammensetzung der Wirkkomponente überwiegend so gewählt, daß in etwa ein Volumenanteil entsprechend dem Nickel im Werkstoff AgNilO erreicht wird.In the examples, the composition of the active component was predominantly chosen so that approximately a volume fraction corresponding to the nickel in the material AgNilO is achieved.

In weiteren Einzelbeispielen werden zur FeTi46-Legierung Titannitride und/oder Titankarbide hinzugefügt. Deren Massenanteile werden so bemessen, daß sie bezogen auf den Eisen-Titan-Gehalt zwischen 1 bis 50 % liegen. Insgesamt wird bei den Beispielen darauf geachtet, daß der Werkstoff maximal in Massenanteilen 50 % unedle Bestandteile enthält.In further individual examples, titanium nitrides and / or titanium carbides are added to the FeTi46 alloy. Their mass fractions are measured so that they are between 1 and 50% based on the iron-titanium content. Overall, in the examples, care is taken that the material contains a maximum of 50% base components in mass fractions.

Von den nach obiger Vorschrift hergestellten Kontaktstücken aus den angegebenen Werkstoffen wurden in einem Prüfschalter unter konstanten Prüfbedingungen bei einem Einschaltstrom von 1000 A und einem Ausschaltstrom von 1000 A in bekannter Weise über eine Schaltzahl von 500 die Schweißkraft der Volumenabbrand und der Kontaktwiderstand ermittelt. Die Ergebnisse sind in der Tabelle zusammengestellt und werden mit den Meßwerten eines herkömmlichen AgNilO-Werkstoffes verglichen.Of the contact pieces made according to the above regulations made of the specified materials, the welding force of the volume burnup and the contact resistance were determined in a known manner in a test switch under constant test conditions at an inrush current of 1000 A and an off current of 1000 A using a switching number of 500. The results are summarized in the table and are compared with the measured values of a conventional AgNilO material.

Die Tabelle zeigt, daß die maximale Schweißkraft bei allen Beispielen nicht wesentlich über dem beim bekannten AgNilO-Vergleichswerkstoff liegt. Der Volumenabbrand liegt dagegen durchweg unter dem des Vergleichswerkstoffes. Der Kontaktwiderstand liegt jeweils in der gleichen Größenordnung, teilweise auch bei höheren Werten.The table shows that the maximum welding force in all examples is not significantly higher than that of the known AgNilO reference material. The volume burn-off, on the other hand, is consistently below that of the reference material. The contact resistance is of the same order of magnitude, sometimes even at higher values.

Insgesamt zeigt aber das durch die Kombination der Einzelwerte gebildete Kontakteigenschaftsspektrum jeweils mit AgNilO vergleichbare Werte. Die angegebenen Kontaktwerkstoffe können daher die AgNi-Werkstoffe ersetzen, so daß nunmehr auf das karzinogene Nickel vollständig verzichtet werden kann.Overall, however, the range of contact properties formed by the combination of the individual values shows values comparable with AgNilO. The specified contact materials can therefore replace the AgNi materials, so that the carcinogenic nickel can now be completely dispensed with.

In weiteren Beispielen können neben den oben angegebenen Metallverbindungen als zusätzliche Wirkkomponenten auch Boride verwendet werden. Insbesondere Zirkon- oder Tantalborid lassen gute Eigenschaften erwarten, wobei jeweils Boride mit Karbiden und/oder Nitriden kombiniert werden können.

Figure imgb0001
In further examples, in addition to the metal compounds specified above, borides can also be used as additional active components. In particular, zirconium or tantalum boride can be expected to have good properties, it being possible in each case to combine borides with carbides and / or nitrides.
Figure imgb0001

Claims (8)

  1. Sintered contact material based on silver for use in power-engineering switchgear, in particular for contact pieces in low-voltage switches, consisting of silver and further active constituents, which comprise a higher-melting metal, a metal alloy and/or a metal compound, in the following composition:
    - at least iron (Fe) and titanium (Ti) which are present in alloyed form as main active constituents,
    - optionally nitrides and/or carbides and/or borides of metals as further active constituents,
    - the further active constituents comprising, in proportions by mass, up to 50% based on the proportion of iron and titanium and
    - the proportion of all active constituents in the material being, in proportions by mass, between 2 and 50% and
    - the remainder in each case being silver.
  2. Sintered contact material according to Claim 1, characterised in that the proportion of the active constituent is less than 40%.
  3. Sintered contact material according to Claim 2, characterised in that the proportion of the active constituent is less than 30%.
  4. Sintered contact material according to Claim 3, characterised in that the proportion of the active constituent is less than 20%.
  5. Sintered contact material according to Claim 1, characterised in that iron (Fe) and titanium (Ti) are present in proportions by mass of about 54 to 46% and form the intermetallic compound FeTi.
  6. Sintered contact material according to Claim 1, characterised in that the metal for forming the nitrides, carbides and/or borides is titanium (Ti).
  7. Sintered contact material according to Claim 1, characterised in that the metal for forming the nitrides, carbides and/or borides is zirconium (Zr).
  8. Sintered contact material according to Claim 1, characterised in that the metal for forming the nitrides, carbides and/or borides is tantalum (Ta).
EP89904519A 1988-04-20 1989-04-19 Sintered contact material based on silver for use in power engineering switchgear, in particular for contact pieces in low-voltage switches Expired - Lifetime EP0414709B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89904519T ATE91727T1 (en) 1988-04-20 1989-04-19 SILVER-BASED SINTERED CONTACT MATERIAL FOR USE IN POWER TECHNOLOGY SWITCHGEAR, ESPECIALLY FOR CONTACT PIECES IN LOW VOLTAGE SWITCHES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3813311 1988-04-20
DE3813311 1988-04-20

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EP0414709A1 EP0414709A1 (en) 1991-03-06
EP0414709B1 true EP0414709B1 (en) 1993-07-21

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US (1) US5246480A (en)
EP (1) EP0414709B1 (en)
DE (1) DE58904983D1 (en)
DK (1) DK246590D0 (en)
IN (1) IN171942B (en)
WO (1) WO1989010417A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10019121A1 (en) * 2000-04-18 2001-10-25 Moeller Gmbh Contact for electrical switch, has carrier region fabricated from one material with contacts of another material, and is produced by sintering process.

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Also Published As

Publication number Publication date
EP0414709A1 (en) 1991-03-06
US5246480A (en) 1993-09-21
IN171942B (en) 1993-02-13
DK246590A (en) 1990-10-12
WO1989010417A1 (en) 1989-11-02
DE58904983D1 (en) 1993-08-26
DK246590D0 (en) 1990-10-12

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