EP0736885B1 - Material for electric contacts of silver with carbon - Google Patents

Material for electric contacts of silver with carbon

Info

Publication number
EP0736885B1
EP0736885B1 EP19960100479 EP96100479A EP0736885B1 EP 0736885 B1 EP0736885 B1 EP 0736885B1 EP 19960100479 EP19960100479 EP 19960100479 EP 96100479 A EP96100479 A EP 96100479A EP 0736885 B1 EP0736885 B1 EP 0736885B1
Authority
EP
Grant status
Grant
Patent type
Prior art keywords
silver
carbon
material
black
primary
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
EP19960100479
Other languages
German (de)
French (fr)
Other versions
EP0736885A3 (en )
EP0736885A2 (en )
Inventor
Peter Dr. Braumann
Wolfgang Dr. Weise
Roger Wolmer
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.)
Umicore AG and Co KG
Original Assignee
DMC2 Degussa Metals Catalysts Cerdec AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Grant date

Links

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00Contacts
    • H01H1/02Contacts characterised by the material thereof
    • H01H1/021Composite materials
    • H01H1/027Composite materials containing carbon particles or fibres
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/04Making alloys by powder metallurgy
    • C22C1/0466Alloys based on noble metals
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C5/00Alloys based on noble metals
    • C22C5/06Alloys based on silver
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00Apparatus or processes specially adapted for manufacture of electric switches
    • H01H11/04Apparatus or processes specially adapted for manufacture of electric switches of switch contacts
    • H01H11/048Apparatus or processes specially adapted for manufacture of electric switches of switch contacts by powder-metallurgical processes
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2300/00Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H
    • H01H2300/036Application nanoparticles, e.g. nanotubes, integrated in switch components, e.g. contacts, the switch itself being clearly of a different scale, e.g. greater than nanoscale

Description

Die Erfindung betrifft einen Werkstoff für elektrische Kontakte, bestehend aus einem Gemisch aus Silber, einer Silberlegierung oder einem Silberverbundwerkstoff mit 0,05 bis 7 Gew.% Kohlenstoff, das kaltisostatisch gepresst und gesintert ist. The invention relates to a material for electric contacts, consisting by weight of a mixture of silver, a silver alloy or a silver composite with 0.05 to 7.% Carbon, which is cold isostatic pressed and sintered.

Kontaktwerkstoffe auf der Basis von Silber mit einigen Gewichtsprozenten Kohlenstoff in Form von Graphit haben in der Niederspannungs-Energietechnik weite Verbreitung gefunden. Contact materials based on silver with some percentages by weight carbon in the form of graphite have been widely used in low-voltage power engineering. In Schutzschaltern bieten Kontakte aus Silber-Graphit eine hohe Sicherheit gegen Verschweißungen. In circuit breakers contacts of silver-graphite provide high security against welds. Nachteilig ist jedoch ein hoher Abbrand und eine schlechte Lichtbogenableitung. However, a disadvantage a high burn-up and a bad arc discharge.

Es gab daher viele Versuche, durch weitere Zusätze zu Silber-Graphit die Abbrandfestigkeit dieses Kontaktwerkstoffs zu erhöhen. Therefore, there have been many attempts to increase by further additions to silver-graphite, the erosion resistance of this contact material. Verbesserungen erreicht man beispielsweise durch den Einbau von Kohlenstoff- bzw. Graphitfäden in den Werkstoff. Improvements can be reached, for example, by incorporating carbon or graphite fibers in the material. So wird in der PCT-Anmeldung WO-92/18995-A1 ein Silber-Kohlenstoff-Verbundwerkstoff für elektrische Kontakte der eingangs genannt Art beschrieben, der neben Graphitpulver noch Kohlenstoffasern enthält, wobei die Länge der Kohlenstoffasern mehr als doppelt so lang sein müssen als der Durchmesser der Graphitteilchen, die einen mittleren Teilchendurchmesser von 0,2 bis 40 µm besitzen sollen. So is 92 WO / 18995-A1 described in the PCT application, a silver-carbon composite material of the mentioned at the outset for electrical contacts type that does not contain carbon fibers in addition to graphite powder, the length of the carbon fibers more than twice as long must be as the diameter of the graphite particles that are to have a mean particle diameter of 0.2 to 40 microns. Dabei wird erwähnt, daß als pulverförmiger Kohlenstoff auch Ruß eingesetzt werden kann. Here, it is noted that carbon black can also be used as a powdery carbon. Am günstigsten soll sich jedoch ein Werkstoff verhalten, bei dem sowohl das Kohlenstoffpulver als auch die Kohlenstoffasern aus Graphit bestehen. At best, however, a material to behave, which consist of both the carbon powder and the carbon graphite.

Die Herstellung dieser Werkstoffe ist durch die Verwendung von Kohlenstoffasern relativ teuer. The production of these materials is relatively expensive by the use of carbon fibers. Außerdem zeigen die Werkstoffe wegen der unterschiedlichen Partikelgrößen von Pulver und Faser ein ungleichmäßiger Ausbrennverhalten, was die Lebensdauer der Kontaktstücke verkürzt. In addition, the materials exhibit a non-uniform burnout, which shortens the life of the contacts due to different particle sizes of powder and fiber.

Die US-PS 2,319,240 beschreibt einen Silber-Kohlenstoff-Werkstoff für elektrische Kontakte, bei dem außer Graphit auch anderer Kohlenstoff verwendet werden kann. US Patent No. 2,319,240 describes a silver-carbon material for electrical contacts, in which, besides graphite and other carbon can be used. Über die Art des Kohlenstoffs und die Größe dieser Kohlenstoffteilchen werden keine Angaben gemacht. No information is given about the nature of the carbon and the size of these carbon particles. Die Herstellung dieser Werkstoffe erfolgt durch Vermischen entsprechender Pulver, Pressen des Pulvers zu einem Halbzeug und Sintern. The preparation of these materials by mixing appropriate powders, pressing the powder to form a semifinished product and sintering.

Ruße mit Primärteilchengrößen unterhalb 25 nm bzw. zwischen 10 und 100 nm sind aus der DE-PS 23 57 524 bzw. aus der Schrift "Elektrisch leitende Kunststoffe", Carl Hauser Verlag, München, 1986, Seite 55-61, bekannt. Carbon blacks with primary particle sizes below 25 nm, or between 10 and 100 nm from DE-PS 23 57 524 and from the document "Electrically conductive plastics", Carl Hauser Verlag, Munich, 1986, pages 55-61, is known.

Es war daher Aufgabe der vorliegenden Erfindung, einen Werkstoff für elektrische Kontakte, bestehend aus Silber, einer Silberlegierung oder einem Silberverbundstoff mit 0,05 bis 7 Gew.% Kohlenstoff zu entwickeln, der verbesserte Abbrandeigenschaften bei sehr guter Verschweißsicherheit zeigt. It is an object of the present invention, a material for electrical contacts consisting of silver, a silver alloy or a silver composite with 0.05 to 7 wt.% Carbon to develop, improved arc erosion with very good welding reliability shows.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Kohlenstoff ausschließlich in Form von Ruß mit einer mittleren Primärteilchengröße von weniger als 150 Nanometer dem Silber-, Silberlegierungs- oder Silberverbundwerkstoffpulver zugesetzt ist. This object is inventively achieved in that the carbon is added exclusively in the form of carbon black with an average primary particle size of less than 150 nanometers to the silver, silver alloy or silver composite powder.

Vorzugsweise liegt die mittlere Primärteilchengröße des eingesetzten Rußes bei weniger als 100 Nanometer. Preferably, the average primary particle size of the carbon black used is less than 100 nanometers.

Diese Werkstoffe zeigen überraschenderweise gegenüber den bekannten Silber-Kohlenstoff-Kontaktwerkstoffen eine verbesserte Abbrandfestigkeit bei hervorragender Verschweißsicherheit. These materials show surprisingly over the known silver-carbon contact materials improved erosion resistance with excellent welding reliability. Ein weiterer Vorteil des Werkstoffes liegt darin, daß er mit vermindertem Kohlenstoffgehalt bessere Werte als Silber-Graphit aufweist und dadurch weniger leitfähige Rückstände beim Schalten hinterläßt. A further advantage of the material is that it has reduced carbon content better values ​​than silver graphite and thereby leaves less residues conductive during switching.

Neben Silber kann durch Zusatz von Ruß auch das Abbrandverhalten von beispielsweise AgNi- und AgCuO-Verbundwerkstoffen verbessert werden. In addition to silver and the combustion behavior of eg Agni and AgCuO composites can be improved by the addition of carbon black.

Folgende Beispiele sollen die Erfindung näher erläutern: The following examples illustrate the invention:

  • 1. Ag-Pulver (<63µm) wird mit Rußpulver einer mittleren Primärteilchengröße von ca. 100 nm in der Zusammensetzung Ag/Ruß-95/5 trocken gemischt und zu einem Strangpreßbolzen kaltisostatisch gepreßt. 1. Ag powder (<63μm) is mixed with carbon black powder an average primary particle size of about 100 nm in the composition Ag / carbon-95/5 dry mixed and cold isostatically pressed to a extrusion billet. Nach dem Sintern unter Schutzgas wird der Bolzen zu Profil stranggepreßt. After sintering under protective gas, the bolt is extruded to profile. Das Profil wird bis zur gewünschten Endabmessung gewalzt. The profile is rolled to the desired final dimension. Von dem Endprofil werden Kontaktstücke abgetrennt, die anschließend zur Erzeugung einer löt- und schweißbaren Schicht in Luft oder Sauerstoffatmosphäre ausgebrannt werden. Of the end profile contact pieces are separated, which are subsequently burned out to produce a solderable and weldable layer in air or oxygen atmosphere.
  • 2. Ag-Pulver (<63µm) wird mit Rußpulver mit einer mittleren Primärteilchengröße von ca. 100 nm in der Zusammensetzung Ag/Ruß-98/2 trocken gemischt, zu einem Strangpreßbolzen kaltisostatisch gepresst und wie in Beispiel 1 zu Kontaktstücken weiterverarbeitet. 2. Ag powder (<63μm) is carbon black 98/2 mixed with carbon black powder having an average primary particle size of about 100 nm in the composition Ag / dry, cold isostatically pressed at a extrusion billet and further processed as in Example 1 into contact pieces.
  • 3. Ag-Pulver (<63µm) wird mit Rußpulver mit einer mittleren Primärteilchengröße von ca. 150 nm in der Zusammensetzung Ag/Ruß-98/2 naß in einem Attritor gemischt. 3. Ag powder (<63μm) is carbon black 98/2 wet mixed with carbon black powder having an average primary particle size of about 150 nm in the composition Ag / in an attritor. Nach dem Trocknen wird die Mischung zu einem Strangpreßbolzen kaltisostatisch gepreßt und wie in Beispiel 1 weiterverarbeitet. After drying, the mixture is cold isostatically pressed into a extrusion billet and further processed as in Example. 1

Die nach Beispiel 1 bis 3 hergestellten Kontaktstücke wurden in einem Modellprüfstand bei 100 A in ihrem Abbrandverhalten und bei 1000 A in ihrer Verschweißkraft mit gleich zusammengesetzten Silber-Graphitwersktoffen verglichen, die anstatt Ruß Graphitpulver bzw. Graphitpulver und Graphitfasern enthielten. The contact pieces prepared according to Example 1 to 3 were compared in a model test at 100 A in their fire behavior and at 1000 A in their welding strength with the same composite silver Graphitwersktoffen containing carbon black instead of graphite powder or graphite powder and graphite fibers.

Die Ergebnisse zeigt folgende Tabelle. The results shown in the table.

Werkstoff material Verschweißkraft 95 % Wert in N Welding force 95% value in N mittl. av. Abbrand in mg (100 A) Burn-in mg (100 A)
Ag/Ruß 98/2 Ag / carbon black 98/2 10 10 10 10
Ag/Ruß 95/5 Ag / carbon black 95/5 5 5 30 30
Ag/Graphit 95/5 Ag / graphite 95/5 15 15 25 25
Ag/Graphit/Graphitfasern 95/2,5/2,5 Ag / graphite / graphite fibers 95 / 2.5 / 2.5 35 35 15 15

Claims (2)

  1. Material for electrical contacts, consisting of a mixture of silver, a silver alloy or a silver composite with 0.05 to 7 wt.% carbon, which is cold isostatic pressed and sintered,
    characterised in that
    the carbon is added to the silver, silver alloy or silver composite powder exclusively in the form of carbon black with an average primary particle size of less than 150 nanometers.
  2. Material according to claim 1,
    characterised in that
    the carbon black possesses an average primary particle size of less than 100 nanometers.
EP19960100479 1995-02-01 1996-01-15 Material for electric contacts of silver with carbon Expired - Lifetime EP0736885B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19503184 1995-02-01
DE1995103184 DE19503184C1 (en) 1995-02-01 1995-02-01 Ag-based material for electrical contacts with improved erosion characteristics and resistant to welding

Publications (3)

Publication Number Publication Date
EP0736885A2 true EP0736885A2 (en) 1996-10-09
EP0736885A3 true EP0736885A3 (en) 1997-10-29
EP0736885B1 true EP0736885B1 (en) 2001-10-17

Family

ID=7752865

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960100479 Expired - Lifetime EP0736885B1 (en) 1995-02-01 1996-01-15 Material for electric contacts of silver with carbon

Country Status (4)

Country Link
EP (1) EP0736885B1 (en)
JP (1) JPH08239724A (en)
DE (1) DE19503184C1 (en)
ES (1) ES2165931T3 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7708974B2 (en) 2002-12-10 2010-05-04 Ppg Industries Ohio, Inc. Tungsten comprising nanomaterials and related nanotechnology
DE102010014745A1 (en) * 2010-01-15 2011-07-21 Tyco Electronics AMP GmbH, 64625 Method for manufacturing switchable, electrical contact member for switching or prominent contacts at e.g. electromagnetic relay, involves accessing contacting area for counter contact, via which material of wire is formed
US8058337B2 (en) 1996-09-03 2011-11-15 Ppg Industries Ohio, Inc. Conductive nanocomposite films

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5905000A (en) * 1996-09-03 1999-05-18 Nanomaterials Research Corporation Nanostructured ion conducting solid electrolytes
DE10261303B3 (en) * 2002-12-27 2004-06-24 Wieland-Werke Ag Electrically conducting composite material used in automotive applications as electrical contact components, such as connectors or connections, comprises a metal strip and a contact layer containing carbon powder and a further additive
JP4579348B1 (en) 2009-03-24 2010-11-10 株式会社アライドマテリアル The electrical contact material
DE102009018035A1 (en) * 2009-04-18 2010-10-28 Moeller Gmbh Contact arrangement for low power applications
CN103366975B (en) * 2012-03-30 2017-12-29 施耐德电器工业公司 Silver based electrical contact material

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1785618A (en) * 1920-04-09 1930-12-16 Gen Railway Signal Co Copper-carbon contact
US2319240A (en) * 1940-03-19 1943-05-18 Mallory & Co Inc P R Electric contact and the like
US2818633A (en) * 1955-03-02 1958-01-07 Gibson Electric Company Electrical contact
DE2357524C2 (en) * 1973-11-17 1982-04-29 Degussa Ag, 6000 Frankfurt, De
DE4111683C2 (en) * 1991-04-10 1993-01-28 Doduco Gmbh + Co Dr. Eugen Duerrwaechter, 7530 Pforzheim, De

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8058337B2 (en) 1996-09-03 2011-11-15 Ppg Industries Ohio, Inc. Conductive nanocomposite films
US8389603B2 (en) 1996-09-03 2013-03-05 Ppg Industries Ohio, Inc. Thermal nanocomposites
US7708974B2 (en) 2002-12-10 2010-05-04 Ppg Industries Ohio, Inc. Tungsten comprising nanomaterials and related nanotechnology
DE102010014745A1 (en) * 2010-01-15 2011-07-21 Tyco Electronics AMP GmbH, 64625 Method for manufacturing switchable, electrical contact member for switching or prominent contacts at e.g. electromagnetic relay, involves accessing contacting area for counter contact, via which material of wire is formed
DE102010014745B4 (en) * 2010-01-15 2011-09-22 Tyco Electronics Amp Gmbh Electrical contact element and method for manufacturing an electrical contact element

Also Published As

Publication number Publication date Type
JPH08239724A (en) 1996-09-17 application
EP0736885A3 (en) 1997-10-29 application
DE19503184C1 (en) 1996-05-02 grant
EP0736885A2 (en) 1996-10-09 application
ES2165931T3 (en) 2002-04-01 grant

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