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EP0554792B1 - Silver-nickel composite material for electrical contacts and electrodes - Google Patents

Silver-nickel composite material for electrical contacts and electrodes Download PDF

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Publication number
EP0554792B1
EP0554792B1 EP93101302A EP93101302A EP0554792B1 EP 0554792 B1 EP0554792 B1 EP 0554792B1 EP 93101302 A EP93101302 A EP 93101302A EP 93101302 A EP93101302 A EP 93101302A EP 0554792 B1 EP0554792 B1 EP 0554792B1
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EP
European Patent Office
Prior art keywords
nickel
silver
composite material
material according
electrodes
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
EP93101302A
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German (de)
French (fr)
Other versions
EP0554792A2 (en
EP0554792A3 (en
Inventor
Otto Löffler
Werner Niessner
Heinz Ambacher
Friedrich E. Schneider
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.)
BERU Ruprecht GmbH and Co KG
Rau G GmbH and Co
Beru Werk Albert Ruprecht GmbH and Co KG
Original Assignee
BERU Ruprecht GmbH and Co KG
Rau G GmbH and Co
Beru Werk Albert Ruprecht GmbH and Co KG
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Publication of EP0554792A2 publication Critical patent/EP0554792A2/en
Publication of EP0554792A3 publication Critical patent/EP0554792A3/en
Application granted granted Critical
Publication of EP0554792B1 publication Critical patent/EP0554792B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
    • H01T13/39—Selection of materials for electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12486—Laterally noncoextensive components [e.g., embedded, etc.]

Definitions

  • the invention relates to a silver-nickel composite material for electrical contacts and electrodes, in particular for spark plug electrodes.
  • Such a silver-nickel composite material in the form of a silver-nickel fiber composite for electrodes and a method for its production are known from DE-OS 2 508 490 (see also DE-A-2361274).
  • a manufacturing process for silver-nickel fiber composite materials can also be found in DE-OS 2 259 636.
  • DE-OS 3 213 481 it is also known to have a composite material consisting of two spirally wound silver alloy layers to form by arranging the material in a tube after the spiral rolling up and extruding or pulling it into a wire.
  • the object on which the invention is based is therefore to create a silver-nickel composite material of the type mentioned at the outset, which allows a longer service life for the electrical contacts and electrodes formed from it and for the devices equipped with these contacts and electrodes, for example spark plugs.
  • the silver component made of an oxygen-impermeable silver alloy and the nickel component consists of nickel or a nickel alloy.
  • the silver-nickel composite according to the invention oxygen attacks on the nickel component, in particular on nickel fibers in a silver matrix, are prevented, so that there is a higher chemical resistance and the silver-nickel composite according to the invention is suitable as an electrode material for contacts and electrodes with a long service life .
  • EP-A-401 598 discloses a center electrode for spark plugs, which has a copper core which is provided in the area of the ignition tip with a coating made of a silver alloy with reduced oxygen permeability.
  • the nickel component in particular can consist of nickel fibers with approximately 1,000 fibers per mm 2 cross section, which are embedded in a silver matrix.
  • a high number of fibers per cross-sectional area unit is important, which are sufficiently thin so that the composite does not break apart due to the different thermal expansion.
  • spark plugs consist of such a composite material
  • very low response voltages result due to the peak effect and field distortion (silver non-magnetic, nickel magnetic), which facilitates cold starts.
  • peak effect and field distortion silver non-magnetic, nickel magnetic
  • the even burn-off across the cross-section, in comparison with electrodes that consist only of silver or only nickel and burn off at the edges, in conjunction with the chemical resistance of the electrodes enables a long service life of the spark plug.
  • the oxygen-tight silver alloy from which the silver component is made according to the invention preferably contains silicon or tin additives or additives of materials with a similar effect, i.e. an effect which makes the silver alloy oxygen-tight, in particular 0.05 to 0.3% by weight of silicon, preferably 0.3% by weight of silicon, or more than 2% by weight of tin being added.
  • the single figure shows a partial sectional view of a spark plug.
  • the spark plug shown in the drawing usually consists of an insulator 1, a body part 2, a center electrode 3, a glass melt 4 and a body electrode 5. Between the body electrode 5 and the center electrode 3 there is the spark gap 6.
  • the material for the center electrode 3 and the body electrode 5 is a silver-nickel composite e.g. from an oxygen-impermeable silver alloy matrix and embedded fibers from a nickel alloy, which is common for spark plugs, or from concentric rings or spirally wound sheets made of alternating oxygen-impermeable silver alloy and a conventional nickel alloy. Electrodes made from the silver-nickel composite material according to the invention can be used in combination with common counter-electrodes made from nickel, from a nickel jacket and copper core, from full silver, fitted with platinum or from a silver jacket, copper core and separating layer.
  • the silver-nickel composite material according to the invention can consist of 20-80% Ni or Ni alloy and the oxygen-impermeable silver with 100 to 6,000 fibers of nickel (nickel alloy) per mm2.
  • a preferred nickel alloy contains 0.3% by weight of Mg and 1-4% by weight of Si, with other alloys such as e.g. Inconel 601 or nickel with a chromium content etc. can be used.
  • the silver-nickel composite material according to the invention can also be used to form electrical contacts, which can consist of the composite material according to the invention as a solid material or can be provided with welded-on disks made of the composite material according to the invention, in which case the carrier material can also be copper or steel , since it is not exposed to the conditions in the engine combustion chamber.
  • nickel tubes filled with the response voltage-lowering substances are embedded in the silver matrix, metal oxides and semiconductors are used as fillers that withstand the combustion chamber conditions.
  • a spark plug with a center electrode made of the composite material according to the invention was tested in continuous operation, it being shown that the response voltage remained almost the same over 300 hours of continuous operation (less than 10% change).
  • the minimum erosion was more uniform over the entire spark-coated ignition area compared to other electrode materials, the edges were much more stable compared to the erosion.
  • the silver-nickel composite material according to the invention is accessible for mass production, the glass melting of a central electrode made of this composite material is possible with commercially available long-life resistant resistance sealing glasses under atmospheric oxygen, the nickel fibers giving the necessary mechanical and thermal stability.
  • the composite material according to the invention is only minimally attacked chemically, so that long service lives result.
  • the low response voltage allows larger electrode distances.
  • additives against sulfur attacks e.g. Add palladium
  • the silver-nickel fiber composite material can also be attached only in or on conventional central and / or body electrodes as an attachment or insert at the ignition-side end.

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  • Spark Plugs (AREA)
  • Contacts (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)

Description

Die Erfindung betrifft einen Silber-Nickel-Verbundwerkstoff für elektrische Kontakte und Elektroden, insbesondere für Zündkerzenelektroden.The invention relates to a silver-nickel composite material for electrical contacts and electrodes, in particular for spark plug electrodes.

Ein derartiger Silber-Nickel-Verbundwerkstoff in Form eines Silber-Nickel-Faserverbundes für Elektroden sowie ein Verfahren zu seiner Herstellung sind aus der DE-OS 2 508 490 (vergl. auch DE-A-2361274) bekannt. Ein Fertigungsverfahren für Silber-Nickel-Faserverbundwerkstoffe ist weiterhin auch der DE-OS 2 259 636 zu entnehmen.Such a silver-nickel composite material in the form of a silver-nickel fiber composite for electrodes and a method for its production are known from DE-OS 2 508 490 (see also DE-A-2361274). A manufacturing process for silver-nickel fiber composite materials can also be found in DE-OS 2 259 636.

Aus der DE-OS 3 213 481 ist es weiterhin bekannt, einen Verbundwerkstoff aus zwei spiralförmig aufgewickelten Silberlegierungsschichten zu bilden, indem nach dem spiralförmigen Aufrollen der Werkstoff in einem Rohr angeordnet und zu einem Draht stranggepreßt bzw. gezogen wird.From DE-OS 3 213 481 it is also known to have a composite material consisting of two spirally wound silver alloy layers to form by arranging the material in a tube after the spiral rolling up and extruding or pulling it into a wire.

Wenn derartige Verbundwerkstoffe für elektrische Kontakte und Elektroden, insbesondere Zündkerzenelektroden, verwandt werden, dann besteht aufgrund der Tatsache, daß Silber sauerstoffdurchlässig ist, die Gefahr, daß die von der Silberkomponente umgebene Nickelkomponente insbesondere in eine Silbermatrix eingebettete Nickelfasern chemischen Angriffen ausgesetzt sind. Das ist insbesondere bei der Verwendung derartiger Silber-Nickel-Verbundwerkstoffe zur Bildung von Zündkerzenelektroden der Fall, die chemischen Angriffen in den Brennräumen ausgesetzt sind. Das setzt die Lebens- oder Laufdauer der entsprechenden Zündkerzen herab.If such composite materials are used for electrical contacts and electrodes, in particular spark plug electrodes, then, because silver is oxygen-permeable, there is a risk that the nickel component surrounded by the silver component will be exposed to chemical attacks, in particular nickel fibers embedded in a silver matrix. This is particularly the case when such silver-nickel composites are used to form spark plug electrodes which are exposed to chemical attacks in the combustion chambers. This reduces the life or running time of the corresponding spark plugs.

Da aufgrund der Zunahme der elektronischen Komponenten in Kraftfahrzeugen und den Auflagen für den Umweltschutz der Bauraum im Motorbereich immer stärker begrenzt ist und somit die Wartung im Motorbereich sehr aufwendig geworden ist, ist es erwünscht, möglichst selten einen Austausch der Zündkerzen oder Zündkontakte vornehmen zu müssen. Gleiches gilt auch für Bio- und Gasmotoren, deren Zündkerzen lange Laufzeiten bei sehr hohen Belastungen haben sollen, die in der Regel nur Platinzündkerzen bzw. mit Platinmetallen oder Platinlegierungen bestückte Elektroden haben können.Since, due to the increase in electronic components in motor vehicles and the requirements for environmental protection, the installation space in the engine area is becoming increasingly limited and therefore maintenance in the engine area has become very complex, it is desirable to have to replace the spark plugs or ignition contacts as rarely as possible. The same also applies to bio and gas engines, the spark plugs of which should have long running times at very high loads and which, as a rule, can only have platinum spark plugs or electrodes fitted with platinum metals or platinum alloys.

Die der Erfindung zugrunde liegende Aufgabe besteht daher darin, einen Silber-Nickel-Verbundwerkstoff der eingangs genannten Art zu schaffen, der eine höhere Lebensdauer der aus ihm gebildeten elektrischen Kontakte und Elektroden und der mit diesen Kontakten und Elektroden bestückten Einrichtungen, beispielsweise Zündkerzen, erlaubt.The object on which the invention is based is therefore to create a silver-nickel composite material of the type mentioned at the outset, which allows a longer service life for the electrical contacts and electrodes formed from it and for the devices equipped with these contacts and electrodes, for example spark plugs.

Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, daß die Silberkomponente aus einer sauerstoffundurchlässigen Silberlegierung besteht und die Nickelkomponente aus Nickel oder einer Nickellegierung besteht.This object is achieved according to the invention in that the silver component made of an oxygen-impermeable silver alloy and the nickel component consists of nickel or a nickel alloy.

Bei dem erfindungsgemäßen Silber-Nickel-Verbundwerkstoff werden somit Sauerstoffangriffe auf die Nickelkomponente, insbesondere auf Nickelfasern in einer Silbermatrix verhindert, so daß sich eine höhere chemische Beständigkeit ergibt und der erfindungsgemäße Silber-Nickel-Verbundwerkstoff als Elektrodenmaterial für Kontakte und Elektroden mit hoher Lebensdauer geeignet ist.With the silver-nickel composite according to the invention, oxygen attacks on the nickel component, in particular on nickel fibers in a silver matrix, are prevented, so that there is a higher chemical resistance and the silver-nickel composite according to the invention is suitable as an electrode material for contacts and electrodes with a long service life .

In diesem Zusammenhang wird darauf hingewiesen, daß aus der EP-A-401 598 eine Mittelelektrode für Zündkerzen bekannt ist, welche einen Kern aus Kupfer aufweist der im Bereich der Zündspitze mit einer Ummantelung aus einer Silberlegierung mit verminderter Sauerstoffdurchlässigkeit versehen ist.In this context, it is pointed out that EP-A-401 598 discloses a center electrode for spark plugs, which has a copper core which is provided in the area of the ignition tip with a coating made of a silver alloy with reduced oxygen permeability.

Bei Verwendung des erfindungsgemäßen Silber-Nickel-Verbundwerkstoffes für Zündkerzenelektroden ergibt sich darüber hinaus ein gutes Abbrandverhalten, so daß Zündkerzen mit derartigen Elektroden eine lange Lebensdauer haben.When using the silver-nickel composite material according to the invention for spark plug electrodes, there is also good combustion behavior, so that spark plugs with such electrodes have a long service life.

Besonders bevorzugte Ausgestaltungen und Weiterbildungen des erfindungsgemäßen Silber-Nickel-Verbundwerkstoffes sind Gegenstand der Patentansprüche 2 bis 8.Particularly preferred refinements and developments of the silver-nickel composite material according to the invention are the subject of claims 2 to 8.

Bei dem erfindungsgemäßen Silber-Nickel-Verbundwerkstoff kann insbesondere die Nickelkomponente aus Nickelfasern mit ca. 1.000 Fasern pro mm² Querschnitt bestehen, die in eine Silbermatrix eingelagert sind. Grundsätzlich ist eine hohe Anzahl von Fasern pro Querschnittsflächeneinheit wichtig, die ausreichend dünn sind, damit sich der Verbund aufgrund der unterschiedlichen Wärmedehnung nicht auseinander sprengt.In the silver-nickel composite material according to the invention, the nickel component in particular can consist of nickel fibers with approximately 1,000 fibers per mm 2 cross section, which are embedded in a silver matrix. Basically, a high number of fibers per cross-sectional area unit is important, which are sufficiently thin so that the composite does not break apart due to the different thermal expansion.

Es ist weiterhin möglich, wechselweise Silber- und Nickelbleche spiralförmig aufzurollen und anschließend zu runden Drähten mit dünnen Schichten zu reduzieren, so daß im Querschnitt Silber- und Nickelbereiche einander abwechseln. Weiterhin können abwechselnd Silber- und Nickelrohre ineinandergesteckt sein und zu einem festen Verbundwerkstoff mit dünnen Schichten reduziert werden. Es ist schließlich auch möglich, anstelle von Nickelfasern Nickelrohre zu verwenden, die in eine Silbermatrix eingebettet werden und mit den Elektronenaustritt begünstigenden Füllstoffen, d.h. mit Füllstoffen gefüllt sind, die die Austrittsarbeit absenken, und so nachbearbeitet werden, daß Nickel als dünne Faser vorliegt. Derartige Füllstoffe können Metalloxide oder Halbleitermaterialien sein. Der in dieser Weise gebildete Verbundwerkstoff kann durch mehrfaches spanloses Umarbeiten in eine gewünschte Drahtform als Ausgangsmaterial für die Mittel- oder Körperelektroden von Zündkerzen in Rund- oder Profilform gebracht werden.It is also possible to alternately roll up silver and nickel sheets in a spiral and then to reduce them to round wires with thin layers, so that the cross-section of silver and nickel areas alternate with one another. Furthermore, alternating silver and nickel tubes can be inserted into each other and reduced to a solid composite material with thin layers. Finally, it is also possible to use nickel tubes instead of nickel fibers, which are embedded in a silver matrix and are filled with fillers which favor the electron leakage, ie with fillers which work on the work function lower, and reworked so that nickel is present as a thin fiber. Such fillers can be metal oxides or semiconductor materials. The composite material formed in this way can be brought into a desired wire shape as a starting material for the central or body electrodes of spark plugs in round or profile shape by multiple non-cutting reworking.

Wenn die Mittel- und/oder Körperelektroden von Zündkerzen aus einem derartigen Verbundwerkstoff bestehen, ergeben sich durch Spitzenwirkung und Feldverzerrung (Silber unmagnetisch, Nickel magnetisch) sehr niedrige Ansprechspannungen, was Kaltstarts erleichtert. Der gleichmäßige Abbrand über den Querschnitt, verglichen mit Elektroden, die nur aus Silber oder nur aus Nickel bestehen und an den Kanten abbrennen, ermöglicht in Verbindung mit der chemischen Beständigkeit der Elektroden eine lange Lebensdauer der Zündkerze.If the center and / or body electrodes of spark plugs consist of such a composite material, very low response voltages result due to the peak effect and field distortion (silver non-magnetic, nickel magnetic), which facilitates cold starts. The even burn-off across the cross-section, in comparison with electrodes that consist only of silver or only nickel and burn off at the edges, in conjunction with the chemical resistance of the electrodes enables a long service life of the spark plug.

Die sauerstoffdichte Silberlegierung, aus der gemäß der Erfindung die Silberkomponente besteht, enthält vorzugsweise Silizium- oder Zinnzusätze oder Zusätze von Materialien mit ähnlicher Wirkung, d.h. einer Wirkung, die die Silberlegierung sauerstoffdicht macht, wobei insbesondere 0,05 bis 0,3 Gew.-% Silizium, vorzugsweise 0,3 Gew.-% Silizium, oder mehr als 2 Gew.-% Zinn zugesetzt sind.The oxygen-tight silver alloy from which the silver component is made according to the invention preferably contains silicon or tin additives or additives of materials with a similar effect, i.e. an effect which makes the silver alloy oxygen-tight, in particular 0.05 to 0.3% by weight of silicon, preferably 0.3% by weight of silicon, or more than 2% by weight of tin being added.

Im folgenden wird anhand der zugehörigen Zeichnung ein besonders bevorzugtes Ausführungsbeispiel der Erfindung näher beschrieben.A particularly preferred exemplary embodiment of the invention is described in more detail below with reference to the accompanying drawing.

Die einzige Figur zeigt eine Teilschnittansicht einer Zündkerze.The single figure shows a partial sectional view of a spark plug.

Die in der Zeichnung dargestellte Zündkerze besteht üblicherweise aus einem Isolator 1, einem Körperteil 2, einer Mittelelektrode 3, einer Glaseinschmelzung 4 und einer Körperelektrode 5. Zwischen der Körperelektrode 5 und der Mittelelektrode 3 besteht die Funkenstrecke 6.The spark plug shown in the drawing usually consists of an insulator 1, a body part 2, a center electrode 3, a glass melt 4 and a body electrode 5. Between the body electrode 5 and the center electrode 3 there is the spark gap 6.

Der Werkstoff für die Mittelelektrode 3 und die Körperelektrode 5 ist ein Silber-Nickel-Verbundwerkstoff z.B. aus einer sauerstoffundurchlässigen Silberlegierungsmatrix und eingelagerten Fasern aus einer Nickellegierung, die bei Zündkerzen üblich ist, oder aus konzentrischen Ringen oder spiralig gewickelten Blechen aus abwechselnd einer sauerstoffundurchlässigen Silberlegierung und einer üblichen Nickellegierung. Elektroden aus dem erfindungsgemäßen Silber-Nickel-Verbundwerkstoff können in Kombination mit marktüblichen Gegenelektroden aus Nickel, aus einem Nickelmantel und Kupferkern, aus Vollsilber, mit Platin bestückt oder aus einem Silbermantel, Kupferkern und Trennschicht verwandt werden.The material for the center electrode 3 and the body electrode 5 is a silver-nickel composite e.g. from an oxygen-impermeable silver alloy matrix and embedded fibers from a nickel alloy, which is common for spark plugs, or from concentric rings or spirally wound sheets made of alternating oxygen-impermeable silver alloy and a conventional nickel alloy. Electrodes made from the silver-nickel composite material according to the invention can be used in combination with common counter-electrodes made from nickel, from a nickel jacket and copper core, from full silver, fitted with platinum or from a silver jacket, copper core and separating layer.

Beispielsweise kann der erfindungsgemäße Silber-Nickel-Verbundwerkstoff aus 20-80 % Ni bzw. Ni-Legierung und dem sauerstoffundurchlässigen Silber bei 100 bis 6.000 Fasern aus Nickel (Nickellegierung) pro mm² bestehen. Eine bevorzugte Nickellegierung enthält 0,3 Gew.-% Mg und 1 - 4 Gew.-% Si, wobei auch andere Legierungen wie z.B. Inconel 601 oder Nickel mit einem Chromanteil usw. verwandt werden können.For example, the silver-nickel composite material according to the invention can consist of 20-80% Ni or Ni alloy and the oxygen-impermeable silver with 100 to 6,000 fibers of nickel (nickel alloy) per mm². A preferred nickel alloy contains 0.3% by weight of Mg and 1-4% by weight of Si, with other alloys such as e.g. Inconel 601 or nickel with a chromium content etc. can be used.

Der erfindungsgemäße Silber-Nickel-Verbundwerkstoff kann auch zur Bildung von elektrischen Kontakten verwandt werden, wobei diese aus dem erfindungsgemäßen Verbundwerkstoff als Vollmaterial bestehen oder mit aufgeschweißten Scheiben aus dem erfindungsgemäßen Verbundmaterial versehen sein können, wobei in diesem Fall der Trägerwerkstoff auch Kupfer oder Stahl sein kann, da er den Verhältnissen im Motorbrennraum nicht ausgesetzt ist.The silver-nickel composite material according to the invention can also be used to form electrical contacts, which can consist of the composite material according to the invention as a solid material or can be provided with welded-on disks made of the composite material according to the invention, in which case the carrier material can also be copper or steel , since it is not exposed to the conditions in the engine combustion chamber.

Wenn statt Nickelfasern mit die Ansprechspannung absenkenden Stoffen gefüllte Nickelrohre in die Silbermatrix eingebettet sind, so werden als Füllstoffe Metalloxide und Halbleiter verwandt, die den Brennraumbedingungen standhalten.If, instead of nickel fibers, nickel tubes filled with the response voltage-lowering substances are embedded in the silver matrix, metal oxides and semiconductors are used as fillers that withstand the combustion chamber conditions.

Es wurde eine Zündkerze mit einer Mittelelektrode aus dem erfindungsgemäßen Verbundwerkstoff im Dauerbetrieb geprüft, wobei sich zeigte, daß die Ansprechspannung über 300 Stunden Dauerlauf nahezu gleich geblieben ist (weniger als 10 % Änderung). Der minimale Abbrand war verglichen mit anderen Elektrodenmaterialien gleichmäßiger über die ganze von Funken bestrichene Zündfläche, die Kanten waren gegenüber dem Abbrand wesentlich stabiler.A spark plug with a center electrode made of the composite material according to the invention was tested in continuous operation, it being shown that the response voltage remained almost the same over 300 hours of continuous operation (less than 10% change). The minimum erosion was more uniform over the entire spark-coated ignition area compared to other electrode materials, the edges were much more stable compared to the erosion.

Der erfindungsgemäße Silber-Nickel-Verbundwerkstoff ist der Mengenfertigung zugänglich, die Glaseinschmelzung einer Mittelelektrode aus diesem Verbundwerkstoff ist mit marktüblichen langlebensdauerbeständigen Widerstands-Einschmelzgläsern unter Luftsauerstoff möglich, wobei die Nickelfasern die notwendige mechanische und thermische Stabilität geben.The silver-nickel composite material according to the invention is accessible for mass production, the glass melting of a central electrode made of this composite material is possible with commercially available long-life resistant resistance sealing glasses under atmospheric oxygen, the nickel fibers giving the necessary mechanical and thermal stability.

Der erfindungsgemäße Verbundwerkstoff wird nur minimal chemisch angegriffen, so daß sich lange Standzeiten ergeben. Die niedrige Ansprechspannung erlaubt größere Elektrodenabstände.The composite material according to the invention is only minimally attacked chemically, so that long service lives result. The low response voltage allows larger electrode distances.

Es ist darüber hinaus möglich, je nach Art der zu befürchtenden chemischen Angriffe, der Silberkomponente weitere Zusätze, beispielsweise Zusätze gegen Schwefelangriffe wie z.B. Palladium zuzugeben.It is also possible, depending on the type of chemical attack to be feared, of the silver component, further additives, for example additives against sulfur attacks, e.g. Add palladium.

Der Silber-Nickel-Faserverbundwerkstoff kann auch nur in oder an üblichen Mittel- und/oder Körperelektroden als An- oder Einsatz beim zündseitigen Ende angebracht werden.The silver-nickel fiber composite material can also be attached only in or on conventional central and / or body electrodes as an attachment or insert at the ignition-side end.

Claims (8)

  1. Silver-nickel composite material for electrical contacts and electrodes, especially for spark plug electrodes, characterised in that the silver component comprises an oxygen-impermeable silver alloy and the nickel component comprises nickel or a nickel alloy.
  2. Composite material according to claim 1, characterised in that the silver alloy contains silicon or tin.
  3. Composite material according to claim 2, characterised in that the silver alloy contains from 0.05 to 0.3% by weight of silicon.
  4. Composite material according to claim 2 or 3, characterised in that the silver alloy contains more than 2% by weight of tin.
  5. Composite material according to any one of the preceding claims, characterised in that the nickel component comprises from 100 to 6000 nickel fibres per mm² which are embedded in a matrix of the silver alloy.
  6. Composite material according to any one of claims 1 to 4, characterised in that the nickel component comprises nickel tubes or nickel alloy tubes which are filled with a material that reduces the work of emission and are embedded in a silver matrix and are so finished that the nickel is in the form of a thin fibre.
  7. Composite material according to any one of claims 1 to 4, characterised in that silver and nickel tubes are arranged inside one another in alternation and are reduced to thin layers by deformation.
  8. Composite material according to any one of claims 1 to 4, characterised in that a silver-nickel sheet-metal composite is wound spirally and reduced to a composite with thin layers.
EP93101302A 1992-02-05 1993-01-28 Silver-nickel composite material for electrical contacts and electrodes Expired - Lifetime EP0554792B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4203250 1992-02-05
DE4203250A DE4203250A1 (en) 1992-02-05 1992-02-05 SILVER-NICKEL COMPOSITE FOR ELECTRICAL CONTACTS AND ELECTRODES

Publications (3)

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EP0554792A2 EP0554792A2 (en) 1993-08-11
EP0554792A3 EP0554792A3 (en) 1993-11-24
EP0554792B1 true EP0554792B1 (en) 1995-11-02

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US (1) US5500304A (en)
EP (1) EP0554792B1 (en)
JP (1) JPH0676917A (en)
DE (2) DE4203250A1 (en)
ES (1) ES2079215T3 (en)

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Publication number Priority date Publication date Assignee Title
US5679471A (en) * 1995-10-16 1997-10-21 General Motors Corporation Silver-nickel nano-composite coating for terminals of separable electrical connectors
US7575665B2 (en) * 2005-04-28 2009-08-18 Delphi Technologies, Inc. Method of reducing corrosion of silver containing surfaces
US8019296B1 (en) * 2008-04-17 2011-09-13 Sprint Spectrum L.P. Selective scanning for WLAN coverage by a multi-mode device
DE102008043225A1 (en) 2008-10-28 2010-04-29 Robert Bosch Gmbh Sparking plug electrode material for use in sparking plug electrode, comprises silver and ceramic secondary phase, where ceramic secondary phase is oxide ceramic
US8334642B2 (en) 2010-05-11 2012-12-18 Caterpillar Inc. Spark plug
US9004969B2 (en) 2011-10-24 2015-04-14 Federal-Mogul Ignition Company Spark plug electrode and spark plug manufacturing method
US9130358B2 (en) 2013-03-13 2015-09-08 Federal-Mogul Ignition Company Method of manufacturing spark plug electrode material
CN104131246B (en) * 2014-07-02 2016-05-11 昆明理工大学 A kind of nickeliferous fiber siluer metal oxide electric contact material and preparation method thereof
JP6456343B2 (en) * 2016-11-30 2019-01-23 日本特殊陶業株式会社 Spark plug
CN108441668B (en) * 2018-04-13 2021-02-26 上海和伍复合材料有限公司 Silver-tungsten electric contact material and preparation method thereof

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1720894A (en) * 1924-04-03 1929-07-16 Oneida Community Ltd Tarnish-resisting silver alloy, etc., and process for producing the same
US1970319A (en) * 1931-05-08 1934-08-14 American Metal Co Ltd Silver alloy
US2052143A (en) * 1935-08-20 1936-08-25 American Metal Co Ltd Silver alloys
BE452819A (en) * 1938-04-30
US3738920A (en) * 1971-05-20 1973-06-12 G Viglione Plating tarnish-inhibited bright silver alloy
DE2250810B2 (en) * 1972-10-17 1976-04-08 Fa. G. Rau, 7530 Pforzheim CONTACT PIECE, IN PARTICULAR CONTACT RIVET, AND MANUFACTURING PROCESS FOR IT
DE2259636A1 (en) * 1972-12-06 1974-06-20 Rau Fa G PROCESS FOR THE PRODUCTION OF A METALLIC FIBER COMPOSITE MATERIAL
US4112905A (en) * 1973-12-08 1978-09-12 G. Rau Spark plugs for internal combustion engines
DE2361274C3 (en) * 1973-12-08 1980-10-09 G. Rau, Gmbh & Co, 7530 Pforzheim Wire-shaped electrode, in particular center electrode, for spark plugs for internal combustion engines
DE2508490C3 (en) * 1975-02-27 1984-07-26 G. Rau GmbH & Co, 7530 Pforzheim Metallic composite material and process for its manufacture
DE2549931A1 (en) * 1975-11-07 1977-05-18 Bosch Gmbh Robert SPARK PLUG ELECTRODE
US4324588A (en) * 1979-08-17 1982-04-13 Engelhard Corporation Arc erosion resistant composite materials and processes for their manufacture
DE3213481A1 (en) * 1982-04-10 1983-10-13 G. Rau GmbH & Co, 7530 Pforzheim Composite material as semifinished product for an electrical contact point and method of producing it
JPS61130446A (en) * 1984-11-29 1986-06-18 Tanaka Kikinzoku Kogyo Kk Sliding contact point material
DE3918278A1 (en) * 1989-06-05 1990-12-06 Rau Gmbh G MEDIUM ELECTRODE FOR SPARK PLUGS AND INTERNAL COMBUSTION ENGINES

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JPH0676917A (en) 1994-03-18
DE4203250A1 (en) 1993-08-12
US5500304A (en) 1996-03-19
ES2079215T3 (en) 1996-01-01
EP0554792A2 (en) 1993-08-11
EP0554792A3 (en) 1993-11-24
DE59300833D1 (en) 1995-12-07

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