EP0729162B1 - Herstellungsverfahren eines elektrischen Verbundkontaktmaterials - Google Patents

Herstellungsverfahren eines elektrischen Verbundkontaktmaterials Download PDF

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Publication number
EP0729162B1
EP0729162B1 EP19960400406 EP96400406A EP0729162B1 EP 0729162 B1 EP0729162 B1 EP 0729162B1 EP 19960400406 EP19960400406 EP 19960400406 EP 96400406 A EP96400406 A EP 96400406A EP 0729162 B1 EP0729162 B1 EP 0729162B1
Authority
EP
European Patent Office
Prior art keywords
carbon fibers
metal powder
length
ground
fibers
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
EP19960400406
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English (en)
French (fr)
Other versions
EP0729162A1 (de
Inventor
Marie-Jo Francillon
Guy Gastaldin
Marc Rival
Pascale Rodriguez
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.)
Schneider Electric Industries SAS
Original Assignee
Schneider Electric SE
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 Schneider Electric SE filed Critical Schneider Electric SE
Publication of EP0729162A1 publication Critical patent/EP0729162A1/de
Application granted granted Critical
Publication of EP0729162B1 publication Critical patent/EP0729162B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H01H1/021—Composite material
    • H01H1/027—Composite material containing carbon particles or fibres

Definitions

  • the present invention relates to a method of manufacturing a material of composite electrical contact, particularly suitable for circuit breakers, this material being based on powder of a metal which is a good electrical conductor such as silver, copper or their compounds, and comprising carbon fibers distributed in the matrix metallic. It also relates to the material obtained by this process.
  • Such materials are commonly used to make pellets of contact in electromechanical devices such as circuit breakers or switches.
  • the primary function of carbon or graphite present in the metallic matrix is to reduce the risk of contact soldering.
  • the presence of graphite leads to increased mechanical and / or electrical erosion of the material.
  • the object of the invention is therefore to avoid the drawbacks described and to allow a simple metalcarbon composite contact material to be produced with a fine, homogeneous and isotropic structure suitable for application in circuit breakers, this material showing good resistance to erosion both under nominal current and under short-circuit current, as well as a behavior satisfactory anti-welding and low and stable contact resistance.
  • carbon is therefore exclusively present in the form of short carbon fiber residues, the statistical distribution of length is centered on the aforementioned final average value, which are distributed from homogeneously in the metallic matrix.
  • the material shows good anti-welding behavior and low and stable contact resistance, at the same time time that, thanks to the semi-crystalline structure proper to all the elements carbonaceous materials inserted in the metallic matrix, low erosion under nominal current or under short circuit current.
  • the compromise between these qualities is determined between others by the choice of the final average length of the fiber residues, preferably between 5 ⁇ m and 20 ⁇ m.
  • This powder is essentially a silver powder, or copper, or their alloys, of usual grain size, with possibly additives such as nickel, tungsten, titanium nitride, carbide tungsten or the like.
  • Mixing the metal powder with crushed carbon fibers are carried out in a dry process in a mechanical mixer blades in step 20 until a homogeneous mixture is obtained, which then undergoes unit compression 30, then sintering 40, so as to obtain a structure of isotropic material.
  • the carbon fibers of the trade are mixed directly cold and dry with the metal powder in a mechanosynthesis step 21, for example in a ball mill or a planetary mill, such as the aforementioned grinding of the fibers takes place concomitant with mixing with metallic powder.
  • the homogeneous mixture undergoes then, as before, unit compression 30 and sintering 40.
  • Example graphite fibers, with an initial average length of 300 ⁇ m, undergo attrition in a ball mill until residual fibers of an average length of less than 20 ⁇ m are obtained and are mixed in a weight proportion of 2 to 5% with silver powder.
  • the weldability of the final material obtained is excellent and its erosion in electrical endurance is very low.
  • FIG. 4 shows on a 280 scale a micrograph of the surface of the material after a 12 kA breaking test at 250 V; it can be seen that the contact surface retains after breaking under short-circuit current its fine, homogeneous and isotropic structure of fiber residues 50 of variable length and any orientation in the silver matrix 51.
  • the material described is particularly suitable for use in circuit breakers.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Powder Metallurgy (AREA)
  • Contacts (AREA)

Claims (5)

  1. Herstellungsverfahren eines elektrischen Kontakt-Verbundwerkstoffes auf der Basis eines elektrisch gut leitenden Metalls, wie beispielsweise Silber, Kupfer oder deren Verbindungen, durch Mischen von Kohlenstoffasern mit dem Metallpulver, Verdichten der Mischung und Sintern, dadurch gekennzeichnet, dass
    die Kohlenstoffasern, deren ursprüngliche Länge einen vorbestimmten Mittelwert (L1) aufweist, einer mechanischen Zerkleinerungsbehandlung in einer Mühle unterworfen werden,
    die Zerkleinerungbedingungen so festgelegt sind, dass Reste von zerkleinerten Kohlenstoffasern erzeugt werden, deren endgültige Länge um einen Mittelwert (L2) herum schwankt, der wesentlich unter dem ursprünglichen Mittelwert (L1) liegt,
    die Mischung der zerkleinerten Faserreste und des Metallpulvers so beschaffen ist, dass sie isotropisch im Werkstoff verteilt werden.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die ursprüngliche mittlere Länge (L1) der Kohlenstoffasern zwischen etwa 100 um und etwa 800 um liegt, und dass die endgültige mittlere Länge (L2) der gemahlenen Kohlenstoffaserreste kleiner ist als etwa 20 um.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Mischung der Kohlenstoffasern mit dem Metallpulver auf trockenem Wege erfolgt.
  4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Zerkleinern der Kohlenstoffasern vor ihrer Mischung mit dem Metallpulver erfolgt.
  5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Zerkleinern der Kohlenstoffasern und das Mischen mit dem Metallpulver durch mechanische Synthese gleichzeitig erfolgen.
EP19960400406 1995-02-27 1996-02-26 Herstellungsverfahren eines elektrischen Verbundkontaktmaterials Expired - Lifetime EP0729162B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9502343A FR2731106A1 (fr) 1995-02-27 1995-02-27 Procede de fabrication d'un materiau de contact electrique composite
FR9502343 1995-02-27

Publications (2)

Publication Number Publication Date
EP0729162A1 EP0729162A1 (de) 1996-08-28
EP0729162B1 true EP0729162B1 (de) 1999-07-28

Family

ID=9476600

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960400406 Expired - Lifetime EP0729162B1 (de) 1995-02-27 1996-02-26 Herstellungsverfahren eines elektrischen Verbundkontaktmaterials

Country Status (4)

Country Link
EP (1) EP0729162B1 (de)
DE (1) DE69603387T2 (de)
ES (1) ES2135179T3 (de)
FR (1) FR2731106A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1655749A1 (de) 2004-11-08 2006-05-10 Schneider Electric Industries Sas Kontaktpastille für einen beweglichen elektrischen Kontakt eines Schutzschalters, beweglicher elektrischer Kontakt mit einer solchen Pastille und Schutzschalter mit einem solchen Kontakt

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2842019B1 (fr) * 2002-07-05 2004-09-24 Alstom Element de contact d'arc pour appareillage electrique, son procede de fabrication, ensemble de contact et appareillage electrique correspondants
DE10346206A1 (de) * 2003-10-06 2005-04-28 Bosch Gmbh Robert Kontaktoberflächen für elektrische Kontakte
US20070145097A1 (en) * 2005-12-20 2007-06-28 Intel Corporation Carbon nanotubes solder composite for high performance interconnect

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2568417B1 (fr) * 1984-07-25 1986-11-28 Lorraine Carbone Procede de fabrication de contacts electriques et contacts obtenus.
JPS62284031A (ja) * 1986-06-02 1987-12-09 Sumitomo Electric Ind Ltd 電気接点材料及びその製造方法
US4699763A (en) * 1986-06-25 1987-10-13 Westinghouse Electric Corp. Circuit breaker contact containing silver and graphite fibers
DE4111683A1 (de) * 1991-04-10 1992-10-22 Duerrwaechter E Dr Doduco Werkstoff fuer elektrische kontakte aus silber mit kohlenstoff

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1655749A1 (de) 2004-11-08 2006-05-10 Schneider Electric Industries Sas Kontaktpastille für einen beweglichen elektrischen Kontakt eines Schutzschalters, beweglicher elektrischer Kontakt mit einer solchen Pastille und Schutzschalter mit einem solchen Kontakt
US7598832B2 (en) 2004-11-08 2009-10-06 Schneider Elecric Industries Sas Contact pad designed for a movable electrical contact of a circuit breaker, movable electrical contact having such a pad and circuit breaker comprising such a contact

Also Published As

Publication number Publication date
DE69603387D1 (de) 1999-09-02
EP0729162A1 (de) 1996-08-28
DE69603387T2 (de) 1999-11-18
FR2731106A1 (fr) 1996-08-30
ES2135179T3 (es) 1999-10-16

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