EP0182386A2 - Method of producing contact parts - Google Patents

Method of producing contact parts Download PDF

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Publication number
EP0182386A2
EP0182386A2 EP85114864A EP85114864A EP0182386A2 EP 0182386 A2 EP0182386 A2 EP 0182386A2 EP 85114864 A EP85114864 A EP 85114864A EP 85114864 A EP85114864 A EP 85114864A EP 0182386 A2 EP0182386 A2 EP 0182386A2
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Prior art keywords
contact
cuo
sno
cdo
content
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EP85114864A
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German (de)
French (fr)
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EP0182386B1 (en
EP0182386A3 (en
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Horst Prof. Dr. Schreiner
Bernhard Rothkegel
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Siemens AG
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Siemens AG
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Classifications

    • 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
    • C22C32/001—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 only oxides
    • C22C32/0015—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 only oxides with only single oxides as main non-metallic constituents
    • C22C32/0021—Matrix based on noble metals, Cu or alloys thereof
    • 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
    • H01H1/0237—Composite material having a noble metal as the basic material and containing oxides
    • H01H1/02372—Composite material having a noble metal as the basic material and containing oxides containing as major components one or more oxides of the following elements only: Cd, Sn, Zn, In, Bi, Sb or Te
    • H01H1/02376—Composite material having a noble metal as the basic material and containing oxides containing as major components one or more oxides of the following elements only: Cd, Sn, Zn, In, Bi, Sb or Te containing as major component SnO2
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B22F2009/0824—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid
    • B22F2009/0828—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid with water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps

Definitions

  • the invention relates to a contact material for low-voltage switching devices in energy technology made of AgSnO, Bi, O, CuO and to an associated method for producing contact pieces from this material.
  • contact materials based on AgCdO with Cd0 as the main active component have proven to be particularly advantageous. These contact materials show a small erosion in the arc, a low welding force and a low heating with continuous current supply.
  • a contact material which, by oxidation of a plated alloy sheet with 3 to 15 wt.% Tin, 0.01 to 1 wt.% Bismuth and 0.1 to 8.5 wt.% Cu is made.
  • an electrical contact material based on silver metal oxide is known from DE-A-2754335, in which 1.5 to 6% by weight bismuth oxide and 0.1 to 6% by weight tin oxide, based on the total amount of oxide, should be present .
  • copper oxide or zinc oxide can also be present, but bismuth oxide and tin oxide always dominate and are of the same order of magnitude.
  • the invention has for its object to design the known AgSnO, Bi, 0, CuO materials such that the production of contact pieces can be done economically.
  • the object is achieved in that the material is a sintered material produced by powder metallurgy from an internally oxidized alloy powder.
  • the total metal oxide content of SnO 2 , Bi, O and Cu0 is preferably between 10 and 25% by volume with a SnO 2 content ⁇ 70% by volume of the total amount of oxide, the total metal oxide content consisting of SnO 2 , Bi, O and CuO , can advantageously be between 15 to 20 vol .-%.
  • an alloy powder is produced from an AgSnBiCu alloy of a given composition by pressure atomization with water, after drying a powder fraction ⁇ 200 ⁇ m is sieved and internally oxidized in air, so that a composite powder made of AgSnO 2 Bi 2 O 3 CuO arises from which contact pieces are produced by pressing in a die with 600 MPa, which are sintered at 800 ° C for one hour and further compressed by hot pressing at approx. 650 ° C with 800 MPa. Further sintering at approximately 850 ° C. for one hour and cold compression may preferably follow.
  • Example Manufacture of a sintered contact material from AgSnO 2 Bi 2 O 3 CuO and the contact piece.
  • An alloy of AgSnBiCu of the specified composition is melted from 90.15% mass content of fine silver grains, 8.05% mass content of tin grains, 0.90% mass content of metallic bismuth as fragments and 0.90% mass content of copper in the form of rods.
  • An alloy powder of the same composition is produced therefrom by pressure atomization with water. After drying, the powder fraction of less than 200 ⁇ m is sieved off. This fraction is internally oxidized in air between 500 and 800 ° C., after which a composite powder. from AgSnO 2 Bi 2 O 3 CuO of the composition 87.95% mass content Ag, 9.97% mass content SnO 2 , 0.98% mass content Bi, O and 1.10% mass content Cu0.
  • the composite powder can be used to produce contact pieces by pressing in a die with 600 MPa. For secure connection technology by brazing, it is useful to press a second layer of pure silver powder together with the contact layer when pressing the composite powder.
  • the contact pieces are sintered at 850 ° C for one hour in air.
  • the contact pieces are compacted by hot pressing at 650 ° C with 800 MPa. Further compression and solidification can be achieved by a second sintering at 850 ° C for one hour in air and a subsequent cold compression.
  • the contact properties of such contact pieces were measured on a test switch.
  • the burn-up values were about 25% better than an extruded AgSnO 2 grade with the same oxide content.
  • Fs99.9 values were 50% lower in the welding force values and 10% lower values in the contact resistance.
  • the structure of the contact material is very fine and even.

Abstract

Electrical contact materials based on AgCdO with CdO as the main active component have proven to be particularly advantageous for low voltage switchgear in the power industry. However, when switching AgCdO contact materials, CdO, which is classified as toxic, can escape into the environment through burn-off. It is important, therefore, to keep the CdO content as low as possible in the contact material, or to exclude it completely. The contact material according to the invention is a sintered contact material consisting of AgSnO2 with at least two other metal oxide additives; namely, Bi2O3, CuO and optionally CdO. Relative to SnO2, these additives Bi2O3, CuO optionally CdO, amount quantitatively to a total maximum of 25 percent by volume of the total amount of oxide.

Description

Die Erfindung bezieht sich auf einen Kontaktwerkstoff für Niederspannungsschaltgeräte der Energietechnik aus AgSnO,Bi,O,CuO sowie auf ein zugehöriges Verfahren zur Herstellung von Kontaktstücken aus diesem Werkstoff.The invention relates to a contact material for low-voltage switching devices in energy technology made of AgSnO, Bi, O, CuO and to an associated method for producing contact pieces from this material.

Für Niederspannungsschaltgeräte der Energietechnik, z.B. in Schützen oder Selbstschaltern, haben sich Kontaktwerkstoffe auf der Basis AgCdO mit Cd0 als Hauptwirkkomponente als besonders vorteilhaft erwiesen. Diese Kontaktwerkstoffe zeigen einen kleinen Abbrand im Lichtbogen, eine kleine Schweißkraft und eine niedrige Erwärmung bei Dauerstromführung.For low-voltage switchgear in energy technology, e.g. In contactors or automatic switches, contact materials based on AgCdO with Cd0 as the main active component have proven to be particularly advantageous. These contact materials show a small erosion in the arc, a low welding force and a low heating with continuous current supply.

Da beim Schalten aus Kontaktstücken, die aus AgCdO-Kontaktwerkstoffen bestehen, über den Abbrand Cd0 in die Umwelt gelangen kann und Cd0 als toxischer Werkstoff eingestuft ist, wird angestrebt, Kontaktwerkstoffe mit anderen Hauptmetalloxidzusätzen, wie SnO2, ZnO, In2O3, Cu0 usw., zu ersetzen. Kontaktwerkstoffe aus AgSnO, ohne weitere Metalloxidzusätze konnten nicht alle Forderungen an die Kontaktwerkstoffe erfüllen. Es sind AgSn0,-Kontaktwerkstoffe mit weiteren Metalloxidzusätzen wie In2O3, Bi,O, vorgeschlagen worden. Aus der GB-A-2055398 ist ein Kontaktwerkstoff bekannt, der durch Oxidation eines plattierten Legierungsbleches mit 3 bis 15 Gew.-% Zinn, 0,01 bis 1 Gew.-% Wismut und 0,1 bis 8,5 Gew.-% Cu hergestellt ist. Daneben ist aus der DE-A-2754335 ein elektrischer Kontaktwerkstoff auf Silber-Metalloxidbasis bekannt, bei dem 1,5 bis 6 Gew.-% Wismutoxid und 0,1 bis 6 Gew.-% Zinnoxid, bezogen auf die Gesamtoxidmenge, vorhanden sein sollen. Zusätzlich kann auch Kupferoxid oder Zinkoxid vorhanden sein, wobei aber immer Wismutoxid und Zinnoxid dominieren und in der gleichen Größenordnung liegen.Since switching from contact pieces made of AgCdO contact materials can get into the environment via the burnup Cd0 and Cd0 is classified as a toxic material, the aim is to use contact materials with other main metal oxide additives such as SnO 2 , ZnO, In 2 O 3 , Cu0 etc. to replace. Contact materials made of AgSnO, without additional metal oxide additives, could not meet all requirements for the contact materials. AgSn0, contact materials with other metal oxide additives such as In 2 O 3 , Bi, O have been proposed. From GB-A-2055398 a contact material is known which, by oxidation of a plated alloy sheet with 3 to 15 wt.% Tin, 0.01 to 1 wt.% Bismuth and 0.1 to 8.5 wt.% Cu is made. In addition, an electrical contact material based on silver metal oxide is known from DE-A-2754335, in which 1.5 to 6% by weight bismuth oxide and 0.1 to 6% by weight tin oxide, based on the total amount of oxide, should be present . In addition, copper oxide or zinc oxide can also be present, but bismuth oxide and tin oxide always dominate and are of the same order of magnitude.

Der Erfindung liegt die Aufgabe zugrunde, die bekannten AgSnO,Bi,0,CuO-Werkstoffe derart auszubilden, daß die Fertigung von Kontaktstücken wirtschaftlich erfolgen kann.The invention has for its object to design the known AgSnO, Bi, 0, CuO materials such that the production of contact pieces can be done economically.

Gemäß der Erfindung wird die Aufgabe dadurch gelöst, daß der Werkstoff ein aus einem inneroxidierten Legierungspulver pulvermetallurgisch erzeugter Sinterwerkstoff ist. Vorzugsweise ist der Summenmetalloxidgehalt aus SnO2, Bi,O, und Cu0 zwischen 10 und 25 Vol.-% mit einem SnO2-Anteil ≽ 70 Vol.-% der Gesamtoxidmenge, wobei der Summenmetalloxidgehalt aus SnO2, Bi,O, und CuO, vorteilhafterweise zwischen 15 bis 20 Vol.-% liegen kann. Als besonders vorteilhaft hat sich gemäß der Erfindung ein Werkstoff erwiesen mit einem Ag-Massengehalt von 87,95 %, einem SnO,-Massengehaft von 9,97 %, einem B i2O3-Massengehalt von 0,98 % und einem CuO-Masssengehalt von 1,10 %.According to the invention, the object is achieved in that the material is a sintered material produced by powder metallurgy from an internally oxidized alloy powder. The total metal oxide content of SnO 2 , Bi, O and Cu0 is preferably between 10 and 25% by volume with a SnO 2 content ≽ 70% by volume of the total amount of oxide, the total metal oxide content consisting of SnO 2 , Bi, O and CuO , can advantageously be between 15 to 20 vol .-%. According to the invention, a material with an Ag mass content of 87.95%, a SnO, mass content of 9.97%, a B i 2 O 3 mass content of 0.98% and a CuO- Mass Enge maintenance of 1, 1 0%.

Zur Herstellung von Kontaktstücken aus dem erfindungsgemäßen Werkstoff wird aus einer AgSnBiCu-Legierung vorgegebener Zusammensetzung durch Druckverdüsen mit Wasser ein Legierungspulver hergestellt, nach dem Trocknen ein Pulveranteil < 200 um abgesiebt und an Luft inneroxidiert, so daß ein Verbundpulver aus AgSnO2Bi2O3CuO entsteht, aus dem durch Pressen in einer Matrize mit 600 MPa Kontaktstücke hergestellt werden, die bei 800 °C während einer Stunde gesintert und durch Warmnachpressen bei ca. 650 °C mit 800 MPa weiterverdichtet werden. Vorzugsweise kann sich eine weitere Sinterung bei ca. 850 °C während einer Stunde und eine Kaltverdichtung anschließen.To produce contact pieces from the material according to the invention, an alloy powder is produced from an AgSnBiCu alloy of a given composition by pressure atomization with water, after drying a powder fraction <200 μm is sieved and internally oxidized in air, so that a composite powder made of AgSnO 2 Bi 2 O 3 CuO arises from which contact pieces are produced by pressing in a die with 600 MPa, which are sintered at 800 ° C for one hour and further compressed by hot pressing at approx. 650 ° C with 800 MPa. Further sintering at approximately 850 ° C. for one hour and cold compression may preferably follow.

Anhand eines Ausführungsbeispiels wird das Herstellen des Werkstoffes gemäß der Erfindung und eines Kontaktstückes aus diesen Werkstoff im einzelnen näher erläutert.Using an exemplary embodiment, the manufacture of the material according to the invention and a contact piece made of this material is explained in more detail.

Beispiel: Herstellen eines Sinterkontaktwerkstoffes aus AgSnO2Bi2O3CuO und des Kontaktstückes.Example: Manufacture of a sintered contact material from AgSnO 2 Bi 2 O 3 CuO and the contact piece.

Aus 90,15 %-Massengehalt Feinsilberkömern, 8,05 %-Massengehalt Zinnkörnern, 0,90 %-Massengehalt metallischem Wismut als Bruchstücke und 0,90 %-Massengehalt Kupfer in Form von Stangen wird eine Legierung aus AgSnBiCu der angegebenen Zussammensetzung erschmolzen. Durch Druckverdüsen mit Wasser wird daraus ein gleich zusammengesetztes Legierungspulver hergestellt Nach dem Trocknen wird der Pulveranteil kleiner 200 pm abgesiebt Dieser Anteil wird an Luft zwischen 500 und 800 °C inneroxdiert, wonach ein Verbundpulver . aus AgSnO2Bi2O3CuO der Zusammensetzung 87,95 %-Massengehalt Ag, 9,97 %-Massengehalt SnO2, 0,98 %-Massengehalt Bi,O, und 1,10 %-Massengehalt Cu0 erhalten wird.An alloy of AgSnBiCu of the specified composition is melted from 90.15% mass content of fine silver grains, 8.05% mass content of tin grains, 0.90% mass content of metallic bismuth as fragments and 0.90% mass content of copper in the form of rods. An alloy powder of the same composition is produced therefrom by pressure atomization with water. After drying, the powder fraction of less than 200 μm is sieved off. This fraction is internally oxidized in air between 500 and 800 ° C., after which a composite powder. from AgSnO 2 Bi 2 O 3 CuO of the composition 87.95% mass content Ag, 9.97% mass content SnO 2 , 0.98% mass content Bi, O and 1.10% mass content Cu0.

Aus dem Verbundpulver können durch Pressen in einer Matrize mit 600 MPa Kontaktstücke hergestellt werden. Für die sichere Verbindungstechnik durch Hartlöten ist es zweckmäßig beim Pressen des Verbundpulvers eine zweite Schicht aus Reinsilberpulver mit der Kontaktschicht gemeinsam zu verpressen. Die Sinterung der Kontaktstücke erfolgt bei 850 °C während einer Stunde an Luft. Durch Warmnachpressen bei 650 °C mit 800 MPa werden die Kontaktstücke verdichtet. Eine weitere Verdichtung und Verfestigung ist durch eine zweite Sinterung bei 850 °C während einer Stunde an Luft und eine darauf folgende weitere Kaltverdichtung zu erreichen.The composite powder can be used to produce contact pieces by pressing in a die with 600 MPa. For secure connection technology by brazing, it is useful to press a second layer of pure silver powder together with the contact layer when pressing the composite powder. The contact pieces are sintered at 850 ° C for one hour in air. The contact pieces are compacted by hot pressing at 650 ° C with 800 MPa. Further compression and solidification can be achieved by a second sintering at 850 ° C for one hour in air and a subsequent cold compression.

Die Kontakteigenschaften solcher Kontaktstücke wurden auf einem Prüfschalter gemessen. Die Abbrandwerte lagen gegenüber einer stranggepreßten AgSnO2-Qualität mit gleichem Oxidanteil um etwa 25 % besser. In den Schweißkraftwerten wurden 50 % niedrigerer Fs99,9-Werte und im Kontaktwiderstand 10 % niedrigere Werte erreicht. Das Gefüge des Kontaktwerkstoffes ist sehr fein und gleichmäßig.The contact properties of such contact pieces were measured on a test switch. The burn-up values were about 25% better than an extruded AgSnO 2 grade with the same oxide content. Fs99.9 values were 50% lower in the welding force values and 10% lower values in the contact resistance. The structure of the contact material is very fine and even.

Claims (7)

1. Kontaktwerkstoff für Niederspannungsschaltgeräte der Energietechnik aus AgSnO,Bi,O,CuO, dadurch gekennzeichnet, daß der Werkstoff ein aus einem inneroxidierten Legierungspulver pulvermetallurgisch erzeugter Sinterwerkstoff ist.1. Contact material for low-voltage switching devices of energy technology made of AgSnO, Bi, O, CuO, characterized in that the material is a sintered material produced from an internally oxidized alloy powder by powder metallurgy. 2. Kontaktwerkstoff nach Anspruch 1, dadurch gekennzeichnet, daß der Summenmetalloxidgehalt aus SnO,, Bi,O, und Cu0 zwischen 10 und 25 Vol.-% mit einem SnO2-Anteil ≽ 70 Vol.-% der Gesamtoxidmenge beträgt.2. Contact material according to claim 1 , characterized in that the total metal oxide content of SnO ,, Bi, O, and Cu0 is between 10 and 25 vol .-% with a SnO 2 content ≽ 70 vol .-% of the total amount of oxide. 3. Kontaktwerkstoff nach Anspruch 2, dadurch gekennzeichnet, daß der Summenmetalloxidgehalt aus SnO2, Bi,O, und Cu0 15 bis 20 Vol.-% beträgt.3. Contact material according to claim 2, characterized in that the total metal oxide content of SnO 2 , Bi, O, and Cu0 is 15 to 20 vol .-%. 4. Kontaktwerkstoff nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Ag-Massengehalt 87,95 %, der SnO,-Massengehalt 9,97 %, der B i,0,-Massengehalt 0,98 % und der CuO-Massengehalt 1,10 % beträgt.4. Contact material according to one of claims 1 to 3, characterized in that the Ag mass content 87.95%, the SnO, mass content 9.97%, the B i, 0, mass content 0.98% and the CuO Mass content is 1.10%. 5. Verfahren zur Herstellung von Kontaktstücken aus einem Werkstoff nach Anspruch 1, gekennzeichnet durch folgende Verfahrensschritte: a) aus einer AgSnBiCu-Legierung vorgegebener Zusammensetzung wird durch Druckverdüsen mit Wasser ein Legierungspulver hergestellt, b) nach dem Trocknen wird der Pulveranteil < 200 pm abgesiebt und c) an Luft zwischen 500 und 800 °C inneroxidiert, so daß ein Verbundpulver aus AgSnO,Bi,0,CuO entsteht. d) aus dem Verbundpulver werden durch Pressen in einer Matrize mit 600 MPa Kontaktstücke hergestellt, e) die Kontakte werden bei ca. 850 °C während einer Stunde gesintert, f) durch Warmnachpressen bei ca. 650 °C mit 800 MPa werden die Kontaktstücke weiter verdichtet. 5. A method for producing contact pieces from a material according to claim 1, characterized by the following process steps: a) an alloy powder is produced from an AgSnBiCu alloy of predetermined composition by pressure atomization with water, b) after drying, the powder fraction <200 pm is sieved and c) internally oxidized in air between 500 and 800 ° C, so that a composite powder of AgSnO, Bi, 0, CuO is formed. d) the composite powder is produced by pressing in a die with 600 MPa contact pieces, e) the contacts are sintered at approx. 850 ° C for one hour, f) the contact pieces are further compressed by hot pressing at approx. 650 ° C with 800 MPa. 6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß sich Verfahrensschritt f) eine weitere Sinterung bei ca. 850 °C während einer Stunde und eine Kaltverdichtung anschließen.6. The method according to claim 5, characterized in that step f) is followed by a further sintering at about 850 ° C for one hour and a cold compression. 7. Verfahren nach nach Anspruch 5 zur Herstellung von Kontaktstüäcken aus einem Werkstoff nach Anspruch 4, dadurch gekennzeichnet, daß für Verfahrensschritt a) eine AgSnBiCu-Legierung aus 90,15 % Ag, 8,05 % Sn, 0,9 % Bi und 0,9 % Cu verwendet wird.7. The method according to claim 5 for the production of contact pieces from a material according to claim 4, characterized in that for process step a) an AgSnBiCu alloy of 90, 1 5% Ag, 8.05% Sn, 0.9% Bi and 0.9% Cu is used.
EP85114864A 1983-02-10 1984-01-30 Method of producing contact parts Expired - Lifetime EP0182386B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85114864T ATE57789T1 (en) 1983-02-10 1984-01-30 PROCESS FOR THE MANUFACTURE OF CONTACT PIECES FROM THIS MATERIAL.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833304637 DE3304637A1 (en) 1983-02-10 1983-02-10 SINTER CONTACT MATERIAL FOR LOW VOLTAGE SWITCHGEAR
DE3304637 1983-02-10

Related Parent Applications (1)

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EP84100927.7 Division 1984-01-30

Publications (3)

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EP0182386A2 true EP0182386A2 (en) 1986-05-28
EP0182386A3 EP0182386A3 (en) 1987-01-14
EP0182386B1 EP0182386B1 (en) 1990-10-24

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EP84100927A Expired EP0118708B1 (en) 1983-02-10 1984-01-30 Sintered contact material for low-tension switchgear
EP85114864A Expired - Lifetime EP0182386B1 (en) 1983-02-10 1984-01-30 Method of producing contact parts

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US (1) US4681702A (en)
EP (2) EP0118708B1 (en)
JP (1) JPS59148215A (en)
AT (2) ATE24628T1 (en)
DE (3) DE3304637A1 (en)

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Publication number Priority date Publication date Assignee Title
WO1989009478A1 (en) * 1988-03-26 1989-10-05 Doduco Gmbh + Co. Dr. Eugen Dürrwächter Semifinished product for electrical contacts, made of a composite material based on silver and tin oxide, and powder metallurgical process for producing it
EP0369283A2 (en) * 1988-11-17 1990-05-23 Siemens Aktiengesellschaft Sintered contact material for low-tension switchgear, particularly for contactors
EP0369282A2 (en) * 1988-11-17 1990-05-23 Siemens Aktiengesellschaft Sintered contact material in low-tension switchgear, particularly for contactors
WO1993026021A1 (en) * 1992-06-10 1993-12-23 Doduco Gmbh + Co. Material for electrical contacts based on silver-tin oxide or silver-zinc oxide

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3421758A1 (en) * 1984-06-12 1985-12-12 Siemens AG, 1000 Berlin und 8000 München SINTER CONTACT MATERIAL FOR LOW VOLTAGE SWITCHGEAR IN ENERGY TECHNOLOGY AND METHOD FOR THE PRODUCTION THEREOF
JPH06104873B2 (en) * 1986-07-08 1994-12-21 富士電機株式会社 Silver-metal oxide contact material and manufacturing method thereof
FR2639466B1 (en) * 1988-11-22 1991-02-15 Telemecanique PROCESS FOR PREPARING AN ELECTRICAL CONTACT MATERIAL AND METHOD FOR MANUFACTURING A CONTACT ELEMENT INCORPORATING SUCH A MATERIAL
US4952353A (en) * 1989-12-28 1990-08-28 Gte Laboratories Incorporated Hot isostatic pressing
DE19503182C1 (en) * 1995-02-01 1996-05-15 Degussa Sintered material used as electrical contacts for switching amperage rating
JP4892327B2 (en) * 2006-11-29 2012-03-07 株式会社富士機械工作所 Tube cutting apparatus and tube cutting method
DE102008056264A1 (en) 2008-11-06 2010-05-27 Ami Doduco Gmbh Process for producing a semifinished product and semifinished product for electrical contacts and contact piece
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CN104498764A (en) * 2014-12-31 2015-04-08 靖江市海源有色金属材料有限公司 Electric contact material and preparation method thereof
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EP0369282A2 (en) * 1988-11-17 1990-05-23 Siemens Aktiengesellschaft Sintered contact material in low-tension switchgear, particularly for contactors
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US4681702A (en) 1987-07-21
DE3304637A1 (en) 1984-08-16
DE3461872D1 (en) 1987-02-05
ATE24628T1 (en) 1987-01-15
DE3483479D1 (en) 1990-11-29
EP0182386B1 (en) 1990-10-24
JPS59148215A (en) 1984-08-24
JPH0377265B2 (en) 1991-12-10
EP0118708B1 (en) 1986-12-30
ATE57789T1 (en) 1990-11-15
EP0182386A3 (en) 1987-01-14
EP0118708A1 (en) 1984-09-19

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