EP0736216A1 - Kontaktwerkstoff auf silberbasis zur verwendung in schaltgeräten der energietechnik - Google Patents
Kontaktwerkstoff auf silberbasis zur verwendung in schaltgeräten der energietechnikInfo
- Publication number
- EP0736216A1 EP0736216A1 EP95902764A EP95902764A EP0736216A1 EP 0736216 A1 EP0736216 A1 EP 0736216A1 EP 95902764 A EP95902764 A EP 95902764A EP 95902764 A EP95902764 A EP 95902764A EP 0736216 A1 EP0736216 A1 EP 0736216A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oxide
- silver
- contact material
- material according
- ferrotungstate
- 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.)
- Granted
Links
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
- H01H1/0237—Composite material having a noble metal as the basic material and containing oxides
-
- 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
- H01H2001/02378—Composite material having a noble metal as the basic material and containing oxides containing iron-oxide as major component
Definitions
- Silver-based contact material for use in switching devices in power engineering
- the invention relates to a silver-based contact material for use in switching devices in energy technology, in particular for contact pieces in low-voltage switching devices, which contains at least iron oxide and zirconium oxide as active components in addition to silver.
- contact materials are known on the one hand of the silver-metal system (AgMe) and on the other hand of the silver-metal oxide system (AgMeO).
- Representatives of the first system are, for example, silver-nickel (AgNi) or silver-iron (AgFe);
- Representatives of the second system are in particular silver-cadmium oxide (AgCdO) or silver-tin oxide (AgSn0 2 ).
- other metal oxides such as in particular bismuth oxide (Bi 2 0,), copper oxide (CuO) and / or tantalum oxide (Ta 2 0r), can be used.
- the practical usability of a contact material based on silver-metal or silver-metal oxide is determined by the so-called electrical contact property spectrum. Relevant parameters are the number of life cycles, on the one hand, which is determined by the erosion of the contact piece, and the so-called overtemperature, on the other hand, ie the heating of a contact bridge, which essentially results from the electrical resistance of the mentioned contact results. In addition, a sufficiently low tendency to weld the contact pieces and also corrosion resistance are important, since the switching properties can change over time, in particular due to long-term corrosion of the material in air switching devices.
- a contact material of the type mentioned in which iron oxide in mass proportions between 1 and 50% and an oxide of a further chemical element in mass proportions between 0.01 and 5% are present as active components in combination .
- zirconium oxide is mentioned as a further metal oxide. It has been shown that the combination of iron oxide and zirconium oxide in particular has a favorable switching property spectrum.
- the latter new material can advantageously replace silver-nickel materials used in many applications, which are increasingly regarded as toxic because of the nickel dusts produced during manufacture and their harmful effects on the human organism.
- the object of the invention is therefore to further improve a material based on silver, iron oxide and zirconium oxide.
- the object of the invention is to add another oxide of the sixth subgroup of the periodic table and / or a mixed oxide consisting of iron oxide and the oxide of an element of the sixth subgroup of the periodic table.
- the additive is preferably a mixed oxide with the elements iron and tungsten, in particular the additive is ferrotungstate (FeWO.).
- the material according to the invention is preferably characterized by mass fractions of 1 to 50% iron oxide and 0.1 to 5% zirconium oxide with an addition in mass fractions of 0.01 to 5% of the further oxide, remainder silver.
- the material is characterized in mass fractions by 2 to 20% iron oxide, 0.05 to 5% zirconium oxide and 0.01 to 2% ferrotungstate, the rest silver. It has been shown that the proportion of ferrotungstate in mass proportions can be less than 1%, in particular less than 0.05%.
- the table shows the switch-on capacity for a material according to the invention in comparison to the materials of the prior art.
- a 15 kW contactor is used for measurement in all cases.
- a powder mixture is prepared by wet mixing the oxide powders.
- the powder mixture is used to extrude strips or wires of the material as a semi-finished product for contact pads, or else to produce contact pieces directly using so-called molding technology. In both cases it is advantageous for secure connection technology with the contact carrier to produce two-layer tapes or two-layer contact pieces with a solderable silver layer on the back.
- the concentrations of the individual active components can be varied during the production of the material. So-called mechanical alloying of silver and single oxide powders can also be used to produce suitable powder mixtures of silver, iron oxide, zirconium oxide and ferrotungstate. As a result, the structural properties of the finished material are advantageously influenced.
- the AgFe 2 0.5.4 Zr0 2 l-FeW0.0.4 material produced is compared with two materials known from the prior art.
- the welding limit current strength of the contact materials and the current carrying capacity of the device, which was measured under the same boundary conditions at the 15 kW / contactor, are listed in each case.
- the other contact properties of the materials correspond to the requirements for contactor applications. From the table it is inferred that a material having the composition AgFe 2 0- 5 5,4Zr0 2 l already a higher welding strength than the limiting current commonly used AgNi20 material has. If an addition of 0.4% by mass FeWO ⁇ is added to this material, the switch-on capacity is limited by the current carrying capacity of the device and not by the welding limit current.
- the welding limit current is increased by at least 20%.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Materials Engineering (AREA)
- Contacts (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4343550A DE4343550A1 (de) | 1993-12-20 | 1993-12-20 | Kontaktwerkstoff auf Silberbasis zur Verwendung in Schaltgeräten der Energietechnik |
DE4343550 | 1993-12-20 | ||
PCT/DE1994/001488 WO1995017758A1 (de) | 1993-12-20 | 1994-12-14 | Kontaktwerkstoff auf silberbasis zur verwendung in schaltgeräten der energietechnik |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0736216A1 true EP0736216A1 (de) | 1996-10-09 |
EP0736216B1 EP0736216B1 (de) | 1997-09-03 |
Family
ID=6505579
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95902764A Expired - Lifetime EP0736216B1 (de) | 1993-12-20 | 1994-12-14 | Kontaktwerkstoff auf silberbasis zur verwendung in schaltgeräten der energietechnik |
Country Status (4)
Country | Link |
---|---|
US (1) | US5663500A (de) |
EP (1) | EP0736216B1 (de) |
DE (2) | DE4343550A1 (de) |
WO (1) | WO1995017758A1 (de) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19530512C1 (de) * | 1995-08-18 | 1996-10-17 | Siemens Ag | Elektrisches Schichtkontaktelement, Halbzeug für Schichtkontaktelemente und Verfahren zu seiner Herstellung |
DE19543223C1 (de) * | 1995-11-20 | 1997-02-20 | Degussa | Silber-Eisen-Werkstoff für elektrische Schaltkontakte (III) |
DE19543208C1 (de) * | 1995-11-20 | 1997-02-20 | Degussa | Silber-Eisen-Werkstoff für elektrische Schaltkontakte (II) |
DE19543222C1 (de) * | 1995-11-20 | 1997-02-20 | Degussa | Silber-Eisen-Werkstoff für elektrische Schaltkontakte (I) |
DE19608490C1 (de) * | 1996-03-05 | 1997-09-04 | Siemens Ag | Kontaktwerkstoff aus Silber und Wirkkomponenten, daraus gefertigtes Formstück sowie Verfahren zur Herstellung des Formstücks |
BR9710794A (pt) * | 1996-08-01 | 1999-08-17 | Metalor Contacts Deutschland G | Processo para a prepara-Æo de um produto de um amterial de contato a base de prata material de contato bem como produto do material de contato |
US5903008A (en) * | 1997-07-02 | 1999-05-11 | General Electric Company | Scatter correction methods and systems in single photon emission computed tomography |
CN1820335A (zh) * | 2004-06-18 | 2006-08-16 | 田中贵金属工业株式会社 | 密封式交流负荷用继电器以及其中使用的Ag系接点元件材料 |
CN104475733A (zh) * | 2014-12-30 | 2015-04-01 | 桂林电器科学研究院有限公司 | 一种片状银镍钨电触头材料的制备方法 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3017424C2 (de) * | 1980-05-07 | 1987-01-15 | Degussa Ag, 6000 Frankfurt | Werkstoff für elektrische Kontakte |
YU46258B (sh) * | 1987-06-06 | 1993-05-28 | Degussa Ag. | Primena srebrno gvozdenog materijala za električne kontakte |
DE4117311A1 (de) * | 1991-05-27 | 1992-12-03 | Siemens Ag | Kontaktwerkstoff auf silberbasis zur verwendung in schaltgeraeten der energietechnik |
DE4201940A1 (de) * | 1992-01-24 | 1993-07-29 | Siemens Ag | Sinterverbundwerkstoff fuer elektrische kontakte in schaltgeraeten der energietechnik |
-
1993
- 1993-12-20 DE DE4343550A patent/DE4343550A1/de not_active Withdrawn
-
1994
- 1994-12-14 US US08/669,463 patent/US5663500A/en not_active Expired - Fee Related
- 1994-12-14 EP EP95902764A patent/EP0736216B1/de not_active Expired - Lifetime
- 1994-12-14 WO PCT/DE1994/001488 patent/WO1995017758A1/de active IP Right Grant
- 1994-12-14 DE DE59403995T patent/DE59403995D1/de not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9517758A1 * |
Also Published As
Publication number | Publication date |
---|---|
US5663500A (en) | 1997-09-02 |
EP0736216B1 (de) | 1997-09-03 |
DE59403995D1 (de) | 1997-10-09 |
DE4343550A1 (de) | 1995-06-22 |
WO1995017758A1 (de) | 1995-06-29 |
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