EP0118015B1 - Sintered double layer contact piece - Google Patents

Sintered double layer contact piece Download PDF

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Publication number
EP0118015B1
EP0118015B1 EP84100926A EP84100926A EP0118015B1 EP 0118015 B1 EP0118015 B1 EP 0118015B1 EP 84100926 A EP84100926 A EP 84100926A EP 84100926 A EP84100926 A EP 84100926A EP 0118015 B1 EP0118015 B1 EP 0118015B1
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EP
European Patent Office
Prior art keywords
content
contact piece
contact
layer
oxide
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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
Application number
EP84100926A
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German (de)
French (fr)
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EP0118015A1 (en
Inventor
Horst Prof. Dr. Schreiner
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Siemens AG
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Siemens AG
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Application filed by Siemens AG filed Critical Siemens AG
Priority to AT84100926T priority Critical patent/ATE20986T1/en
Publication of EP0118015A1 publication Critical patent/EP0118015A1/en
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Publication of EP0118015B1 publication Critical patent/EP0118015B1/en
Expired 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
    • H01H1/023—Composite material having a noble metal as the basic material
    • H01H1/0231—Composite material having a noble metal as the basic material provided with a solder layer

Definitions

  • the invention relates to a two-layer sintered contact piece with a contact layer made of silver-tin oxide with contents of Bi 2 0 3 , CuO and another metal oxide and a solderable or weldable second layer on the connection side, characterized in that the structure of the contact layer from different composed areas of the expansion ⁇ 200 microns, one area made of AgSnOyBi 2 0 3 CuOCdO and the other area made of AgCdOBi 2 0 3 .
  • the aim is to contact materials with other main metal oxide additives such as Sn0 2 , ZnO, In 2 0 3 , CuO, etc ., to replace, contact materials made of AgSn0 2 without further metal oxide additives could not meet all requirements for the contact properties.
  • AgSn0 2 contact materials with further metal oxide additives such as In 2 0 3 , Bi 2 0 3 are known.
  • GB-A-2055398 discloses contact material made from liber tin oxide containing bismuth oxide and copper oxide and which may also contain other metal oxides.
  • the invention has for its object to improve the known AgCdO contact pieces so that the content of CdO can be kept as low as possible by adding other metal oxides.
  • the structure of the contact layer consists of differently composed regions with an expansion of ⁇ 200 ⁇ m, that one region consists of AgSn0 2 Bi 2 0 3 CUOCdO and that the other region consists of AgCdOBi 2 0 3 .
  • the AgSn0 2 Bi 2 0 3 CuOCdO areas have a total oxide content between 10 and 25 vol .-% with a Sn02 content ⁇ 70 vol .-% of the total amount of oxide.
  • the Bi 2 0 3 content is advantageously between 0.5 to 2 o / o mass content, the CuO content 0.5 to 1.5% mass content and the CdO content 0.1 to 2% mass content.
  • composition of the second structural regions made of AgCdOBi 2 0 3 is advantageously between 10 and 20 vol.% Of the total metal oxide content. In these areas, the Bi 2 0g content is 0.5 to 2% mass content.
  • the special contact properties of the contact piece according to the invention are characterized by the structure of the contact layer, which consists of two differently composed areas.
  • An AgSnBiCuCd alloy with Ag 90.47% mass content, Sn 6.63% mass content, Bi 1.37% mass content Cu 0.81% mass content, Cd 0.72% mass content becomes an alloy powder with particle sizes ⁇ 200 ⁇ m, for example, produced by pressure spraying.
  • the powder is heat-treated in air or in an oxygen-containing atmosphere between 500 and 800 ° C until complete internal oxidation.
  • the total oxide content is 16 vol.%, The Sn0 2 content is 11.81 vol.% (8.23% mass content), the Bi 2 0 3 content is 1.67 vol.% (1.49% - Mass content), the CuO content 1.54 vol .-% (1.0% mass content) and the CdO content 0.98 vol .-% (0.8% mass content).
  • An alloy powder with a particle size of ⁇ 200 ⁇ m is produced from a second alloy of AgCdBi with a 10.5% mass content of Cd and a 0.82% mass content of Bi.
  • the base metal components are internally oxidized into the corresponding oxides CdO and Bi 2 0 3 during a heat treatment between 500 and 800 ° C. Attention is paid to the completeness of the internal oxidation.
  • the total oxide content is 16.14% by volume, the Bi 2 0 3 content is 1.14% by volume (1% mass content).
  • the two composite powders are mixed in a weight ratio of 80% of the AgSn0 2 Bi 2 0 3 CuOCdO powder with 20% AgCdOBi 2 0 3 powder.
  • the powder mixture is compressed in a die with a silver powder layer at 600 MN / m 2 to form a two-layer molded part.
  • the compact is then sintered in air at 850 ° C for one hour.
  • the two-layer contact piece is compacted by hot pressing the sintered body with a pressing pressure of 600 MN / m 2 . If necessary, the contact piece can be further compressed by re-sintering at 800 ° C for one hour in air or in nitrogen and cold repressing at a pressure of 800 MN / m 2 .
  • the contact properties of the contact piece according to the invention were examined in a test switch and compared with an AgCd012 contact piece of the highest quality standard achieved to date. With the same burn-up values and comparable contact resistance values (heating), lower F S99.9 values (max welding force values) were determined, which achieved a higher switch-on capacity .
  • a powder mixture of silver powder and the powders of the corresponding metal oxides mixed with the first can also be used in the production Compound powder can be used.

Abstract

1. A sintered double-layer contact piece comprising a contact layer consisting of silver-tin oxide with contents of Bi2 O3 , CUO and a further metal oxide, and a second layer on the connecting side, which is capable of being soldered or welded, characterized in that the structure of the contact layer exhibits differently composed regions of extension < 200 mu m ; that the one region consists of AgSnO2 Bi2 O3 CuOCdO and that the other region consists of AgCdOBi2 O3 .

Description

Die Erfindung bezieht sich auf ein Zweischichten-Sinterkontaktstück mit einer Kontaktschicht aus Silber-Zinnoxid mit Gehalten an Bi203, CuO und einem weiteren Metalloxid und einer lötfähigen oder schweißfähigen zweiten Schicht auf der Verbindungsseite, dadurch gekennzeichnet, daß das Gefüge der Kontaktschicht aus unterschiedlich zusammengesetzten Bereichen der Ausdehnung < 200 µm besteht, wobei der eine Bereich aus AgSnOyBi203CuOCdO und der andere Bereich aus AgCdOBi203 besteht.The invention relates to a two-layer sintered contact piece with a contact layer made of silver-tin oxide with contents of Bi 2 0 3 , CuO and another metal oxide and a solderable or weldable second layer on the connection side, characterized in that the structure of the contact layer from different composed areas of the expansion <200 microns, one area made of AgSnOyBi 2 0 3 CuOCdO and the other area made of AgCdOBi 2 0 3 .

Es ist bekannt, in Niederspannungsschaltgeräten der Energietechnik (Schutzschalter, Kleinselbstschalter) Kontaktstücke aus AgCdO zu verwenden.It is known to use AgCdO contact pieces in low-voltage switching devices in power engineering (circuit breakers, small self-switches).

Da beim Schalten aus Kontaktstücken, die aus AgCdO-Kontaktwerstoffen bestehen, über den Abbrand CdO in die Umwelt gelangen kann und CdO als toxischer Werkstoff eingestuft ist, wird angestrebt, Kontaktwerkstoffe mit anderen Hauptmetalloxidzusätzen wie Sn02, ZnO, In203, CuO usw., zu ersetzen, Kontaktwerkstoffe aus AgSn02 ohne weitere Metalloxidzusätze konnten nicht alle Forderungen an die Kontakteigenschaften erfüllen. Es sind AgSn02-Kontaktwerkstoffe mit weiteren Metalloxidzusätzen wie In203, Bi203 bekannt. Aus der GB-A-2055398 sind Kontahtwellestoffe bekannt, die aus Liber-Zinnoxid mit gehalten an Wismutoxid und Kupferoxid bestehen und noch weitere Metalloxide enthalten können.Since switching from contact pieces that consist of AgCdO contact materials, CdO can escape into the environment via the burnup and CdO is classified as a toxic material, the aim is to contact materials with other main metal oxide additives such as Sn0 2 , ZnO, In 2 0 3 , CuO, etc ., to replace, contact materials made of AgSn0 2 without further metal oxide additives could not meet all requirements for the contact properties. AgSn0 2 contact materials with further metal oxide additives such as In 2 0 3 , Bi 2 0 3 are known. GB-A-2055398 discloses contact material made from liber tin oxide containing bismuth oxide and copper oxide and which may also contain other metal oxides.

Der Erfindung liegt die Aufgabe zugrunde, die bekannte AgCdO-Kontaktstücke dahingehend zu verbessern, daß durch Beimischungen anderer Metalloxide der Gehalt an CdO so gering wie möglich gehalten werden kann.The invention has for its object to improve the known AgCdO contact pieces so that the content of CdO can be kept as low as possible by adding other metal oxides.

Die Aufgabe wird dadurch gelöst, daß das Gefüge der Kontaktschicht aus unterschiedlich zusammengesetzten Bereichen der Ausdehnung <200 µm besteht, daß der eine Bereich aus AgSn02Bi203CUOCdO und daß der andere Bereich aus AgCdOBi203 besteht.The object is achieved in that the structure of the contact layer consists of differently composed regions with an expansion of <200 μm, that one region consists of AgSn0 2 Bi 2 0 3 CUOCdO and that the other region consists of AgCdOBi 2 0 3 .

Vorteilhafterweise weisen die AgSn02Bi203CuOCdO-Bereiche einen Summenoxidgehalt zwischen 10 und 25 Vol.-% mit einem Sn02-Anteil ≧ 70 Vol.-% der Gesamtoxidmenge auf. In diesen Bereichen beträgt der Bi203-Gehalt vorteilhaft zwischen 0,5 bis 2 o/o-Massengehalt, der CuO-Gehalt 0,5 bis 1.5 %-Massengehalt und der CdO-Gehalt 0,1 bis 2 %-Massengehalt.Advantageously, the AgSn0 2 Bi 2 0 3 CuOCdO areas have a total oxide content between 10 and 25 vol .-% with a Sn02 content ≧ 70 vol .-% of the total amount of oxide. In these areas, the Bi 2 0 3 content is advantageously between 0.5 to 2 o / o mass content, the CuO content 0.5 to 1.5% mass content and the CdO content 0.1 to 2% mass content.

Die Zusammensetzung der zweiten Gefügebereiche aus AgCdOBi203 beträgt vorteilhafterweise zwischen 10 und 20 Vol.-% des Summenmetalloxidgehalts. In diesen Bereichen beträgt der Bi20g-Gehalt 0,5 bis 2 %-Massengehalt.The composition of the second structural regions made of AgCdOBi 2 0 3 is advantageously between 10 and 20 vol.% Of the total metal oxide content. In these areas, the Bi 2 0g content is 0.5 to 2% mass content.

Die besonderen Kontakteigenschaften des Kontaktstückes gemäß der Erfindung sind durch das Gefüge der Kontaktschicht gekennzeichnet, das aus zwei unterschiedlich zusammengesetzten Bereichen besteht.The special contact properties of the contact piece according to the invention are characterized by the structure of the contact layer, which consists of two differently composed areas.

Anhand eines Beispiels wird das Herstellen eines Kontaktstückes gemäß der Erfindung noch näher beschrieben.The manufacture of a contact piece according to the invention is described in more detail using an example.

Beispielexample

Aus einer AgSnBiCuCd-Legierung mit Ag 90,47 %-Massengehalt, Sn 6,63 %-Massengehalt, Bi 1,37 %-Massengehalt Cu 0,81 %-Massengehalt, Cd 0,72 %-Massengehalt wird ein Legierungspulver mit Teilchengrößen <200 µm z.B. durch Druckverdüsen hergestellt. Zur Überführung der Unedelmetallanteile in die entsprechenden Oxide wird das Pulver an Luft oder in sauerstoffhaltiger Atmosphäre zwischen 500 und 800 °C bis zur vollständigen inneren Oxidation wärmebehandelt. Der Summenoxidgehalt beträgt 16 Vol.-%, der Sn02-Gehalt 11,81 Vol.-% (8,23 %-Massengehalt), der Bi203-Gehalt 1,67 Vol.-% (1,49 %-Massengehalt), der CuO-Gehalt 1,54 Vol.-% (1,0 %-Massengehalt) und der CdO-Gehalt 0,98 Vol.-% (0,8 %-Massengehalt). Aus einer zweiten Legierung aus AgCdBi mit 10,5 %-Massengehalt Cd und 0,82 %-Massengehalt Bi wird ein Legierungspulver der Teilchengröße <200 µm hergestellt. Die Unedelmetallanteile werden in die entsprechenden Oxide CdO und Bi203 während einer Wärmebehandlung zwischen 500 und 800 °C inneroxidiert. Dabei wird auf die Vollständigkeit der inneren Oxidation geachtet. Der Gesamtoxidgehalt beträgt 16,14 Vol.-%, der Bi203-Gehalt 1,14 Vol.-% (1 %-Massengehalt). Die beiden Verbundpulver werden im Gewichtsverhältnis 80 % des AgSn02Bi203CuOCdO-Pulvers mit 20 % AgCdOBi203-Pulver gleichmäßig gemischt. Die Pulvermischung wird in einer Matrize mit einer Silberpulverschicht mit 600 MN/m2 zu einem Zweischichtenformteil verdichtet. Der Preßkörper wird anschließend bei 850 °C eine Stunde lang an Luft gesintert. Durch Warmnachpressen des Sinterkörpers mit einem Preßdruck von 600 MN/m2 wird das Zweischichten-Kontaktstück verdichtet. Im Bedarfsfall kann durch Nachsintern bei 800 °C während einer Stunde an Luft bzw. in Stickstoff und Kaltnachpressen mit einem Preßdruck von 800 MN/m2 das Kontaktstück weiter verdichtet werden.An AgSnBiCuCd alloy with Ag 90.47% mass content, Sn 6.63% mass content, Bi 1.37% mass content Cu 0.81% mass content, Cd 0.72% mass content becomes an alloy powder with particle sizes < 200 µm, for example, produced by pressure spraying. To convert the base metal components into the corresponding oxides, the powder is heat-treated in air or in an oxygen-containing atmosphere between 500 and 800 ° C until complete internal oxidation. The total oxide content is 16 vol.%, The Sn0 2 content is 11.81 vol.% (8.23% mass content), the Bi 2 0 3 content is 1.67 vol.% (1.49% - Mass content), the CuO content 1.54 vol .-% (1.0% mass content) and the CdO content 0.98 vol .-% (0.8% mass content). An alloy powder with a particle size of <200 μm is produced from a second alloy of AgCdBi with a 10.5% mass content of Cd and a 0.82% mass content of Bi. The base metal components are internally oxidized into the corresponding oxides CdO and Bi 2 0 3 during a heat treatment between 500 and 800 ° C. Attention is paid to the completeness of the internal oxidation. The total oxide content is 16.14% by volume, the Bi 2 0 3 content is 1.14% by volume (1% mass content). The two composite powders are mixed in a weight ratio of 80% of the AgSn0 2 Bi 2 0 3 CuOCdO powder with 20% AgCdOBi 2 0 3 powder. The powder mixture is compressed in a die with a silver powder layer at 600 MN / m 2 to form a two-layer molded part. The compact is then sintered in air at 850 ° C for one hour. The two-layer contact piece is compacted by hot pressing the sintered body with a pressing pressure of 600 MN / m 2 . If necessary, the contact piece can be further compressed by re-sintering at 800 ° C for one hour in air or in nitrogen and cold repressing at a pressure of 800 MN / m 2 .

In einem Prüfschalter wurden die Kontakteigenschaften des Kontaktstückes gemäß der Erfindung untersucht und mit einem AgCd012-Kontaktstück des bisher höchst erreichten Qualitätsstandards verglichen. Bei gleichen Abbrandwerten und vergleichbaren Kontaktwiderstandswerten (Erwärmung) wurden niedrigere FS99,9-Werte (Schweißkraftmaximalwerte) ermittelt, womit ein höheres Einschaltvermögen erreicht wurde.The contact properties of the contact piece according to the invention were examined in a test switch and compared with an AgCd012 contact piece of the highest quality standard achieved to date. With the same burn-up values and comparable contact resistance values (heating), lower F S99.9 values ( maximum welding force values) were determined, which achieved a higher switch-on capacity .

Beim Herstellen kann anstelle des zweiten Verbundpulvers auch eine Pulvermischung aus Silberpulver und den Pulvern der entsprechenden Metalloxide in Mischung mit dem ersten Verbundpulver verwendet werden.Instead of the second composite powder, a powder mixture of silver powder and the powders of the corresponding metal oxides mixed with the first can also be used in the production Compound powder can be used.

Claims (5)

1. A sintered double-layer contact piece comprising a contact layer consisting of silver-tin oxide with contents of Bi203, CuO and a further metal oxide, and a second layer on the connecting side, which is capable of being soldered or welded, characterised in that the structure of the contact layer exhibits differently composed regions of extension < 200µm; that the one region consists of AgSn02Bi203Cu0Cd0 and that the other region consists of AgCdOBi203.
2. A contact piece as claimed in Claim 1, characterised in that the AgSn02Bi203Cu0Cd0- regions have a total oxide content of between 10 and 25% per volume with a Sn02-portion > 70% by volume of the total amount of oxide.
3. A contact piece as claimed in Claim 1 or Claim 2, characterised in that the Bi203-content is 0.5 to 2% bulk content, the CuO-content is 0.5 to 1.5% bulk content and the CdO-content is 0.1 to 2% bulk content.
4. A contact piece as claimed in one of the preceding Claims, characterised in that the composition of the second structure regions consisting of AgCdOBi203 has a total metal oxide content of between 10 and 20% by volume.
5. A contact piece as claimed in Claim 4, characterised in that the Bi203-content is 0.5 to 2% bulk content.
EP84100926A 1983-02-10 1984-01-30 Sintered double layer contact piece Expired EP0118015B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84100926T ATE20986T1 (en) 1983-02-10 1984-01-30 TWO LAYER SINTER CONTACT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833304619 DE3304619A1 (en) 1983-02-10 1983-02-10 TWO-LAYER SINTER CONTACT
DE3304619 1983-02-10

Publications (2)

Publication Number Publication Date
EP0118015A1 EP0118015A1 (en) 1984-09-12
EP0118015B1 true EP0118015B1 (en) 1986-07-23

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Application Number Title Priority Date Filing Date
EP84100926A Expired EP0118015B1 (en) 1983-02-10 1984-01-30 Sintered double layer contact piece

Country Status (4)

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EP (1) EP0118015B1 (en)
JP (1) JPS59148214A (en)
AT (1) ATE20986T1 (en)
DE (2) DE3304619A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1803502C3 (en) * 1968-10-17 1973-01-04 Inovan-Stroebe Kg, 7534 Birkenfeld Silver metal oxide material
DE2446698C2 (en) * 1974-09-30 1983-04-14 Siemens AG, 1000 Berlin und 8000 München Two-layer sintered contact piece for electrical switching devices
JPS6013051B2 (en) * 1978-08-11 1985-04-04 中外電気工業株式会社 Improvement of electrical contact material by internally oxidizing silver↓-tin↓-bismuth alloy
GB2055398B (en) * 1979-08-01 1983-06-02 Chugai Electric Ind Co Ltd Electrical contact materials of internally oxidized ag-sn-bi alloy

Also Published As

Publication number Publication date
EP0118015A1 (en) 1984-09-12
ATE20986T1 (en) 1986-08-15
JPS59148214A (en) 1984-08-24
DE3460310D1 (en) 1986-08-28
DE3304619A1 (en) 1984-08-16

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