EP0118708A1 - Sintered contact material for low-tension switchgear - Google Patents

Sintered contact material for low-tension switchgear Download PDF

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Publication number
EP0118708A1
EP0118708A1 EP84100927A EP84100927A EP0118708A1 EP 0118708 A1 EP0118708 A1 EP 0118708A1 EP 84100927 A EP84100927 A EP 84100927A EP 84100927 A EP84100927 A EP 84100927A EP 0118708 A1 EP0118708 A1 EP 0118708A1
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Prior art keywords
content
mass
cdo
contact material
mass content
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German (de)
French (fr)
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EP0118708B1 (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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    • 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 sintered contact material for low-voltage switching devices in power engineering made of AgSn0 2 with at least two further metal oxide additives.
  • contact materials based on AgCd0 with Cd0 as the main active component have proven to be particularly advantageous. These contact materials show a small burn-up in the arc, a low welding force and a low heating with continuous current supply.
  • the aim is to use contact materials with other main metal oxide additives such as Sn0 2 , ZnO, In 2 O 3 , Cu0 etc. to replace.
  • Contact materials made of AgSnO 2 without additional metal oxide additives could not meet all the requirements regarding the contact properties.
  • AgSn0 2 contact materials with further metal oxide additives such as In 2 0 3 , Bi 2 O 3 are known.
  • the invention has for its object to improve the known AgSn0 2 materials with further metal oxide additives in such a way that the concentrations of the further metal oxide additives are significantly lower and in particular the content of toxic materials.
  • the object is achieved in that Bi203, Cu0 and optionally Cd0 are provided as further metal oxides and in that the total metal oxide content is between 10 and 25 vol.% With a Sn0 2 proportion ⁇ 70 vol.
  • a total metal oxide content between 15 to 20% by volume has proven to be particularly advantageous.
  • To be particularly advantageous according to the invention has a AgSn0 2 Bi 2 0 3 Cu0 material proved with a Ag - content of 87.95% -Massengehalt, a SnO 2 content of 9.97% -Massengehalt, a Bi 2 0 3 Content of 0.98% by mass and a CuO content of 1.10% by mass.
  • Another material according to the invention consists of AgSnO 2 Bi 2 O 3 CuOCdO with a Bi 2 0 3 content between 0.5 and 2% mass content, a CuO content between 0.5 and 1.5% mass content and one CdO content between 0.05 and 2% mass content, in particular with an Ag content of 87.89% mass content, an Sn0 2 content of 9.92% mass content, a Bi 2 0 3 content of 1, 1% mass content, a CuO content of 1.2% mass content and a CdO content of 0.3% mass content or with an Ag content of 81.42% mass content, an Sn0 2 content of 13, 09% mass content, a Bi 2 0 3 content of 2.0% mass content, a CuO content of 1.5% mass content and a CdO content of 2.0% mass content.
  • An alloy of AgSnBiCu of the specified composition is melted from 90.15% mass content of single-grain 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 from it by pressure atomization with water. After drying, the powder fraction smaller than 200 ⁇ m is sieved off. This portion is internally oxidized in air between 500 and 800 ° C, after which a composite powder of AgSn0 2 Bi 2 0 3 CuO with the composition 87.95% mass content Ag, 9.97% mass content SnO 2 , 0.98% mass content Bi 2 0 3 and 1.10% mass content Cu0 is obtained.
  • 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 compaction and consolidation is achieved by a second sintering. To reach 850 ° C for one hour in air and a subsequent further 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 AgSn0 2 quality with the same oxide content.
  • In the sweat force values were 50% lower F S99.9 values and 10% lower values in contact resistance.
  • the structure of the contact material is very fine and even.
  • the dried powder mixture is compacted with 300 MPa moldings.
  • the contact pieces are compacted by hot pressing at 650 ° C with 800 MPa.
  • a further compression can be achieved by a further heat treatment at 850 ° C for half an hour in air or nitrogen and a subsequent further cold or warm compression.
  • An alloy of AgSnBiCuCd with 90.06% mass content Ag, 7.67% mass content Sn, 1.01% mass content Bi, 0.98% mass content Cu and 0.27% mass content Cd becomes a particle size powder ⁇ 200 ⁇ m, for example by pressure spraying with water.
  • a composite powder made of AgSnO 2 Bi 2 O 3 CuOCdO with 87.89% mass content Ag, 9.92% mass content Sn0 2 , 1.1% mass content Bi203, 1.2% mass content Cu0 and 0.3% mass content Cd0 obtained.
  • the internal oxidation is carried out during an annealing treatment in air between 500 and 800 ° C. The time is chosen so that complete internal oxidation is achieved.
  • a two-layer powder compact is produced from the composite powder as in Example 1.
  • the compact is solidified by sintering and the residual porosity of the contact piece is reduced by hot or cold post-compression.
  • the contact quality achieved in this way also has the same good contact properties with the same composition as in Example 2.
  • a micrograph shows the uniform globular oxide deposits in the silver base metal.
  • the silver-tin-oxide contact materials with the further oxide additives Bi203, Cu0 and optionally Cd0 according to the invention represent one of the multitude of possibilities Special material selection with a very specific composition.
  • the contact materials with CdO as an oxide additive the CdO content could be reduced by 1 to 2 orders of magnitude.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Composite Materials (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Contacts (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Switches (AREA)
  • Conductive Materials (AREA)
  • Mechanisms For Operating Contacts (AREA)

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 Sinterkontaktwerkstoff für Niederspannungsschaltgeräte der Energietechnik aus AgSn02 mit mindestens zwei weiteren Metalloxidzusätzen.The invention relates to a sintered contact material for low-voltage switching devices in power engineering made of AgSn0 2 with at least two further metal oxide additives.

Für Niederspannungsschaltgeräte der Energietechnik, z.B. in Schützen oder Selbstschaltern, haben sich Kontaktwerkstoffe auf der Basis AgCd0 mit Cd0 als Hauptwirkkomponente als besonders vorteilhaft erwiesen. Diese Kbntaktwerkstoffe 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 AgCd0 with Cd0 as the main active component have proven to be particularly advantageous. These contact materials show a small burn-up 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 Sn02, ZnO, In2O3, Cu0 usw., zu ersetzen. Kontaktwerkstoffe aus AgSnO2 ohne weitere Metalloxidzusätze konnten nicht alle Forderungen an die Kontakteigenschaften erfüllen. Es sind AgSn02-Kontaktwerkstoffe mit weiteren Metalloxidzusätzen wie In203, Bi2O3 bekannt.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 Sn0 2 , ZnO, In 2 O 3 , Cu0 etc. to replace. Contact materials made of AgSnO 2 without additional metal oxide additives could not meet all the requirements regarding the contact properties. AgSn0 2 contact materials with further metal oxide additives such as In 2 0 3 , Bi 2 O 3 are known.

Der Erfindung liegt die Aufgabe zugrunde, die bekannten AgSn02-Werkstoffe mit weiteren Metalloxidzusätzen dahingehend zu verbessern, daß die Konzentrationen der weiteren Metalloxidzusätze wesentlich niedriger sind und dabei insbesondere der Gehalt an toxischen Werkstoffen.The invention has for its object to improve the known AgSn0 2 materials with further metal oxide additives in such a way that the concentrations of the further metal oxide additives are significantly lower and in particular the content of toxic materials.

Gemäß der Erfindung wird die Aufgabe dadurch gelöst, daß als weitere Metalloxide Bi203, Cu0 und wahlweise Cd0 vorgesehen sind und daß der Summenmetalloxidgehalt zwischen 10 und 25 Vol.-% mit einem Sn02-Anteil ≥ 70 Vol.-% der Gesamtoxidmenge beträgt.According to the invention the object is achieved in that Bi203, Cu0 and optionally Cd0 are provided as further metal oxides and in that the total metal oxide content is between 10 and 25 vol.% With a Sn0 2 proportion ≥ 70 vol.

Als besonders vorteilhaft hat sich ein Summenmetalloxidgehalt zwischen 15 bis 20 Vol.-% erwiesen.A total metal oxide content between 15 to 20% by volume has proven to be particularly advantageous.

Als besonders vorteilhaft hat sich gemäß der Erfindung ein AgSn02Bi203Cu0-Werkstoff erwiesen mit einem Ag-Gehalt von 87,95 %-Massengehalt, einem SnO2-Gehalt von 9,97 %-Massengehalt, einem Bi203-Gehalt von 0,98 %-Massengehalt und einem CuO-Gehalt von 1,10 %-Massengehalt.To be particularly advantageous according to the invention has a AgSn0 2 Bi 2 0 3 Cu0 material proved with a Ag - content of 87.95% -Massengehalt, a SnO 2 content of 9.97% -Massengehalt, a Bi 2 0 3 Content of 0.98% by mass and a CuO content of 1.10% by mass.

Ein weiterer Werkstoff gemäß der Erfindung besteht aus AgSnO2Bi2O3CuOCdO mit einem Bi203-Gehalt zwischen 0,5 und 2 %-Massengehalt, einem CuO-Gehalt zwischen 0,5 und 1,5 %-Massengehalt und einem CdO-Gehalt zwischen 0,05 und 2 %-Massengehalt, insbesondere mit einem Ag-Gehalt von 87,89 %-Massengehalt, einem Sn02-Gehalt von 9,92 %-Massengehalt, einem Bi203-Gehalt von 1,1 %-Massengehalt, einem CuO-Gehalt von 1,2 %-Massengehalt und einem CdO-Gehalt von 0,3 %-Massengehalt oder mit einem Ag-Gehalt von 81,42 %-Massengehalt, einem Sn02-Gehalt von 13,09 %-Massengehalt, einem Bi203-Gehalt von 2,0 %-Massengehalt, einem CuO-Gehalt von 1,5 %-Massengehalt und einem CdO-Gehalt von 2,0 % Massengehalt.Another material according to the invention consists of AgSnO 2 Bi 2 O 3 CuOCdO with a Bi 2 0 3 content between 0.5 and 2% mass content, a CuO content between 0.5 and 1.5% mass content and one CdO content between 0.05 and 2% mass content, in particular with an Ag content of 87.89% mass content, an Sn0 2 content of 9.92% mass content, a Bi 2 0 3 content of 1, 1% mass content, a CuO content of 1.2% mass content and a CdO content of 0.3% mass content or with an Ag content of 81.42% mass content, an Sn0 2 content of 13, 09% mass content, a Bi 2 0 3 content of 2.0% mass content, a CuO content of 1.5% mass content and a CdO content of 2.0% mass content.

Anhand dreier Ausführungsbeispiele wird das Herstellen des Werkstoffs und daraus eines Kontaktstückes gemäß der Erfindung näher erläutert.The manufacture of the material and a contact piece according to the invention are explained in more detail using three exemplary embodiments.

Beispiel 1example 1

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

Aus 90,15 %-Massengehalt F.einsilberkörnern, 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 Zusammensetzung erschmolzen. Durch Druckverdüsen mit Wasser wird daraus ein gleich zusammengesetztes Legierungspulver hergestellt. Nach dem Trocknen wird der Pulveranteil kleiner 200 um abgesiebt. Dieser Anteil wird an Luft zwischen 500 und 800°C inneroxidiert, wonach ein Verbundpulver aus AgSn02Bi203CuO der Zusammensetzung 87,95 %-Massengehalt Ag, 9,97 %-Massengehalt SnO2, 0,98 %-Massengehalt Bi203 und 1,10 %-Massengehalt Cu0 erhalten wird.An alloy of AgSnBiCu of the specified composition is melted from 90.15% mass content of single-grain 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 from it by pressure atomization with water. After drying, the powder fraction smaller than 200 μm is sieved off. This portion is internally oxidized in air between 500 and 800 ° C, after which a composite powder of AgSn0 2 Bi 2 0 3 CuO with the composition 87.95% mass content Ag, 9.97% mass content SnO 2 , 0.98% mass content Bi 2 0 3 and 1.10% mass content Cu0 is obtained.

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 compaction and consolidation is achieved by a second sintering. To reach 850 ° C for one hour in air and a subsequent further cold compression.

Die Kontakteigenschaften solcher Kontaktstücke wurden auf einem Prüfschalter gemessen. Die Abbrandwerte lagen gegenüber einer stranggepreßten AgSn02-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 AgSn0 2 quality with the same oxide content. In the sweat force values were 50% lower F S99.9 values and 10% lower values in contact resistance. The structure of the contact material is very fine and even.

Beispiel 2Example 2

Herstellen eines Sinterkontaktwerkstoffs aus AgSnO2Bi2O3CuOCdO und des Kontaktstückes.Manufacture of a sintered contact material from AgSnO 2 Bi 2 O 3 CuOCdO and the contact piece.

Aus 81,42 %-Massengehalt Elektrolyse- oder Fällungssilberpulver und feinen Metalloxidpulvern aus 13,09 %-Massengehalt SnO2, 2,0 %-Massengehalt Bi2O3, 1,5 %-Massengehalt Cu0 und 2,0 %-Massengehalt CdO wird ein Pulver durch Naßmischen und Sieben der Teilchengröße < 200 µm hergestellt.From 81.42% mass content of electrolysis or precipitation silver powder and fine metal oxide powders from 13.09% mass content SnO 2 , 2.0% mass content Bi 2 O 3 , 1.5% mass content Cu0 and 2.0% mass content CdO a powder is produced by wet mixing and sieving the particle size <200 microns.

Aus der getrockneten Pulvermischung werden mit 300 MPa Formkörper verdichtet. Um eine einwandfreie Verbindung der Kontaktstücke mit einem Träger sicherzustellen ist es zweckmäßig, die Kontaktschicht mit einer zweiten Pulverschicht, z.B. aus Reinsilber, zu einem Zweischichten-Preßkörper zu verdichten. Die Sinterung erfolgt bei 8500C während einer Stunde an Luft. Durch Warmnachpressen bei 650°C mit 800 MPa werden die Kontaktstücke verdichtet. Eine weitere Verdichtung ist durch eine weitere Wärmebehandlung bei 850°C während einer halben Stunde an Luft oder Stickstoff und eine darauf folgende weitere Kalt- oder Warmverdichtung zu erreichen.The dried powder mixture is compacted with 300 MPa moldings. In order to ensure a perfect connection of the contact pieces to a carrier, it is expedient to compact the contact layer with a second powder layer, for example made of pure silver, to form a two-layer pressed body. Sintering takes place at 850 0 C for one hour in air. The contact pieces are compacted by hot pressing at 650 ° C with 800 MPa. A further compression can be achieved by a further heat treatment at 850 ° C for half an hour in air or nitrogen and a subsequent further cold or warm compression.

Die Kontakteigenschaften dieser Kontaktstücke wurden auf einem Prüfschalter gemessen und mit einer sehr guten AgCdO-Qualität verglichen. Bei vergleichbaren Abbrandwerten wurden eine etwas günstigere Erwärmung (10 % niedrigerer Kontaktwiderstand) und eine etwa um 15 % niedrigere Schweißkraft erreicht.The contact properties of these contact pieces were measured on a test switch and compared with a very good AgCdO quality. At comparable burn-up values, a somewhat cheaper heating (10% lower contact resistance) and an approx 15% lower welding power.

Beispiel 3Example 3

Herstellen eines Sinterkontaktwerkstoffes aus AgSnO2Bi2O3CuOCdO und des Kontaktstückes.Manufacture of a sintered contact material from AgSnO 2 Bi 2 O 3 CuOCdO and the contact piece.

Aus einer Legierung aus AgSnBiCuCd mit 90,06 %-Massengegehalt Ag, 7,67 %-Massengehalt Sn, 1,01 %-Massengehalt Bi, 0,98 %-Massengehalt Cu und 0,27 %-Massengehalt Cd wird ein Pulver der Teilchengröße < 200 µm, z.B. durch Druckverdüsen mit Wasser, hergestellt. Durch innere Oxidation des Legierungspulvers wird ein Verbundpulver aus AgSnO2Bi2O3CuOCdO mit 87,89 %-Massengehalt Ag, 9,92 %-Massengehalt Sn02, 1,1 %-Massengehalt Bi203, 1,2 %-Massengehalt Cu0 und 0,3 %-Massengehalt Cd0 erhalten. Die innere Oxidation wird während einer Glühbehandlung an Luft zwischen 500 und 800°C durchgeführt. Dabei wird die Zeit so gewählt, daß eine vollständige innere Oxidation erreicht wird.An alloy of AgSnBiCuCd with 90.06% mass content Ag, 7.67% mass content Sn, 1.01% mass content Bi, 0.98% mass content Cu and 0.27% mass content Cd becomes a particle size powder <200 µm, for example by pressure spraying with water. By internal oxidation of the alloy powder, a composite powder made of AgSnO 2 Bi 2 O 3 CuOCdO with 87.89% mass content Ag, 9.92% mass content Sn0 2 , 1.1% mass content Bi203, 1.2% mass content Cu0 and 0.3% mass content Cd0 obtained. The internal oxidation is carried out during an annealing treatment in air between 500 and 800 ° C. The time is chosen so that complete internal oxidation is achieved.

Aus dem Verbundpulver wird wie bei Beispiel 1 ein Zweischichten-Pulverpreßkörper hergestellt. Durch Sintern wird der Preßkörper verfestigt und durch Warm- bzw. Kaltnachverdichten wird die Restporosität des Kontaktstückes herabgesetzt. Auch die so erreichte Kontaktqualität hat bei gleicher Zusammensetzung wie im Beispiel 2 die gleich guten Kontakteigenschaften. Ein Gefügebild zeigt die gleichmäßig globularen Oxidausscheidungen im Silbergrundmetall.A two-layer powder compact is produced from the composite powder as in Example 1. The compact is solidified by sintering and the residual porosity of the contact piece is reduced by hot or cold post-compression. The contact quality achieved in this way also has the same good contact properties with the same composition as in Example 2. A micrograph shows the uniform globular oxide deposits in the silver base metal.

Die Silber-Zinn-Oxid-Kontaktwerkstoffe mit den weiteren Oxidzusätzen Bi203, Cu0 und wahlweise Cd0 gemäß der Erfindung stellen eine aus der Vielzahl der Möglichkeiten spezielle Werkstoffauswahl bei ganz bestimmter Zusammensetzung dar. Bei den Kontaktwerkstoffen mit CdO als Oxidzusatz konnte der CdO-Gehalt um 1 bis 2 Größenordnungen gesenkt werden.The silver-tin-oxide contact materials with the further oxide additives Bi203, Cu0 and optionally Cd0 according to the invention represent one of the multitude of possibilities Special material selection with a very specific composition. With the contact materials with CdO as an oxide additive, the CdO content could be reduced by 1 to 2 orders of magnitude.

Claims (6)

1. Sinterkontaktwerkstoff für Niederspannungsschaltgeräte der Energietechnik aus AgSn02 mit mindestens zwei weiteren Metalloxidzusätzen, dadurch gekennzeichnet , daß als weitere Metalloxide Bi203, Cu0 und wahlweise Cd0 vorgesehen sind und daß der Summenmetalloxidgehalt zwischen 10 und 25 Vol.-% mit einem SnO2-Anteil ≥ 70 Vol.-% der Gesamtoxidmenge beträgt.1. Sintered contact material for low-voltage switching devices in power engineering made of AgSn0 2 with at least two further metal oxide additives, characterized in that Bi 2 0 3 , Cu0 and optionally Cd0 are provided as further metal oxides and that the total metal oxide content is between 10 and 25 vol.% With a SnO 2 -Proportion ≥ 70 vol .-% of the total amount of oxide. 2. Kontaktwerkstoff nach Anspruch 1, dadurch gekennzeichnet , daß der Summenmetalloxidgehalt 15 bis 20 Vol.-% beträgt.2. Contact material according to claim 1, characterized in that the total metal oxide content is 15 to 20 vol .-%. 3. Kontaktwerkstoff nach Anspruch 1 oder 2, dadurch gekennzeichnet , daß er aus AgSnO2Bi2O3CuO besteht mit einem Ag-Gehalt von 87,95 %-Massengehalt, einem SnO2-Gehalt von 9,97 %-Massengehalt, einem Bi203-Gehalt von 0,98 %-Massengehalt und einem CuO-Gehalt von 1,10 %-Massengehalt.3. Contact material according to claim 1 or 2, characterized in that it consists of AgSnO 2 Bi 2 O 3 CuO with an Ag content of 87.95% by mass, an SnO 2 content of 9.97% by mass, one Bi 2 0 3 content of 0.98% mass content and a CuO content of 1.10% mass content. 4. Kontaktwerkstoff nach Anspruch 1 oder 2, dadurch gekennzeichnet , daß er aus AgSnO2Bi2O3CuOCdO besteht mit einem Bi203-Gehalt zwischen 0,5 und 2 %-Massengehalt, einem CuO-Gehalt zwischen 0,5 und 1,5 %-Massengehalt und einem CdO-Gehalt zwischen 0,05 und 2 %-Massengehalt.4. Contact material according to claim 1 or 2, characterized in that it consists of AgSnO 2 Bi 2 O 3 CuOCdO with a Bi 2 0 3 content between 0.5 and 2% mass content, a CuO content between 0.5 and 1.5% mass content and a CdO content between 0.05 and 2% mass content. 5. Kontaktwerkstoff nach Anspruch 4, dadurch gekennzeichnet , daß er einen Ag-Gehalt von 87,89 %-Massengehalt, einen Sn02-Gehalt von 9,92 %-Massengehalt, einen Bi203-Gehalt von 1,1 %-Massengehalt, einen CuO-Gehalt von 1,2 %-Massengehalt und einen Cd0-Gehalt von 0,3 %-Massengehalt aufweist.5. Contact material according to claim 4, characterized in that it has an Ag content of 87.89% mass content, an Sn0 2 content of 9.92% mass content, a Bi 2 0 3 content of 1.1% - Mass content, a CuO content of 1.2% mass content and a Cd0 content of 0.3% mass content. 6. Kontaktwerkstoff nach Anspruch 4, dadurch gekennzeichnet , daß er einen Ag-Gehalt von 81,42 %-Massengehalt, einen SnO2-Gehalt von 13,09 %-Massengehalt, einen Bi203-Gehalt von 2,0 %-Massengehalt, einen CuO-Gehalt von 1,5 %-Massengehalt und einen CdO-Gehalt von 2,0 %-Massengehalt aufweist.6. Contact material according to claim 4, characterized in that it has an Ag content of 81.42% mass content, an SnO 2 content of 13.09% mass content, a Bi 2 0 3 content of 2.0% - Mass content, a CuO content of 1.5% mass content and a CdO content of 2.0% mass content.
EP84100927A 1983-02-10 1984-01-30 Sintered contact material for low-tension switchgear Expired EP0118708B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84100927T ATE24628T1 (en) 1983-02-10 1984-01-30 SINTERED CONTACT MATERIAL FOR LOW VOLTAGE SWITCHGEAR.

Applications Claiming Priority (2)

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DE19833304637 DE3304637A1 (en) 1983-02-10 1983-02-10 SINTER CONTACT MATERIAL FOR LOW VOLTAGE SWITCHGEAR
DE3304637 1983-02-10

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EP0118708B1 EP0118708B1 (en) 1986-12-30

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EP85114864A Expired - Lifetime EP0182386B1 (en) 1983-02-10 1984-01-30 Method of producing contact parts

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JP (1) JPS59148215A (en)
AT (2) ATE57789T1 (en)
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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
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DE58909295D1 (en) * 1988-11-17 1995-07-20 Siemens Ag Low-voltage switchgear sintered contact material of energy technology, especially for motor contactors.
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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
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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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Also Published As

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US4681702A (en) 1987-07-21
JPH0377265B2 (en) 1991-12-10
ATE57789T1 (en) 1990-11-15
DE3461872D1 (en) 1987-02-05
DE3483479D1 (en) 1990-11-29
EP0182386A3 (en) 1987-01-14
JPS59148215A (en) 1984-08-24
EP0118708B1 (en) 1986-12-30
DE3304637A1 (en) 1984-08-16
EP0182386A2 (en) 1986-05-28
EP0182386B1 (en) 1990-10-24
ATE24628T1 (en) 1987-01-15

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