EP0118015B1 - Pièce de contact frittée à deux couches - Google Patents

Pièce de contact frittée à deux couches 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
Authority
EP
European Patent Office
Prior art keywords
content
contact piece
contact
layer
oxide
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
Application number
EP84100926A
Other languages
German (de)
English (en)
Other versions
EP0118015A1 (fr
Inventor
Horst Prof. Dr. Schreiner
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.)
Siemens AG
Original Assignee
Siemens 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
Application filed by Siemens AG filed Critical Siemens AG
Priority to AT84100926T priority Critical patent/ATE20986T1/de
Publication of EP0118015A1 publication Critical patent/EP0118015A1/fr
Application granted granted Critical
Publication of EP0118015B1 publication Critical patent/EP0118015B1/fr
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.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Contacts (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Inorganic Insulating Materials (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Switches (AREA)

Claims (5)

1 - Pièce de contact frittée à deux couches, comprenant une couche de contact en oxyde d'argent et d'étain ayant des teneurs en Bi203, en CuO et en un autre oxyde métallique et une seconde couche susceptible d'être brasée ou d'être soudée sur le côté de liaison, caractérisée en ce que la texture de la couche de contact présente des régions de composition différentes d'une étendue inférieure à 200 µm et en ce que l'une des régions est en AgSnO2Bi203CuOCdO et l'autre en AgCdOBi2O3.
2 - Pièce de contact suivant la revendication 1, caractérisée en ce que les régions en AgSn02Bi203CuOCdO présentent une teneur en la somme des oxydes représentant de 10 à 25 % en volume, avec une teneur en Sn02 supérieure ou égale à 70 % du volume de la quantité d'oxyde totale.
3 - Pièce de contact suivant la revendication 1 ou 2, caractérisée en ce que la teneur massique en Bi203 est de 0,5 à 2 %, la teneur massique en CuO est de 0,5 à 1,5 % et la teneur massique en CdO est de 0,1 à 2 %.
4 - Pièce de contact suivant l'une des revendications précédentes, caractérisée en ce que la composition des secondes régions de texture en AgCdOBiyOg a une teneur en la somme des oxydes métalliques comprise entre 10 et 20 % en volume.
5 - Pièce de contact suivant la revendication 4, caractérisée en ce que la teneur massique en Bi203 est comprise entre 0,5 et 2 %.
EP84100926A 1983-02-10 1984-01-30 Pièce de contact frittée à deux couches Expired EP0118015B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84100926T ATE20986T1 (de) 1983-02-10 1984-01-30 Zweischichten-sinterkontaktstueck.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3304619 1983-02-10
DE19833304619 DE3304619A1 (de) 1983-02-10 1983-02-10 Zweischichten-sinterkontaktstueck

Publications (2)

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

Family

ID=6190537

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84100926A Expired EP0118015B1 (fr) 1983-02-10 1984-01-30 Pièce de contact frittée à deux couches

Country Status (4)

Country Link
EP (1) EP0118015B1 (fr)
JP (1) JPS59148214A (fr)
AT (1) ATE20986T1 (fr)
DE (2) DE3304619A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1803502C3 (de) * 1968-10-17 1973-01-04 Inovan-Stroebe Kg, 7534 Birkenfeld Silber-Metalloxid-Werkstoff
DE2446698C2 (de) * 1974-09-30 1983-04-14 Siemens AG, 1000 Berlin und 8000 München Zweischichten-Sinterkontaktstück für elektrische Schaltgeräte
JPS6013051B2 (ja) * 1978-08-11 1985-04-04 中外電気工業株式会社 銀↓−錫↓−ビスマス系合金を内部酸化した電気接点材料の改良
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
JPS59148214A (ja) 1984-08-24
EP0118015A1 (fr) 1984-09-12
DE3304619A1 (de) 1984-08-16
DE3460310D1 (en) 1986-08-28
ATE20986T1 (de) 1986-08-15

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