EP0736216B1 - Silver-based contact material for switchgears used in power engineering - Google Patents
Silver-based contact material for switchgears used in power engineering Download PDFInfo
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- EP0736216B1 EP0736216B1 EP95902764A EP95902764A EP0736216B1 EP 0736216 B1 EP0736216 B1 EP 0736216B1 EP 95902764 A EP95902764 A EP 95902764A EP 95902764 A EP95902764 A EP 95902764A EP 0736216 B1 EP0736216 B1 EP 0736216B1
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- EP
- European Patent Office
- Prior art keywords
- oxide
- silver
- contact material
- ferrotungstate
- material according
- Prior art date
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- 239000000463 material Substances 0.000 title claims abstract description 39
- 229910052709 silver Inorganic materials 0.000 title claims abstract description 13
- 239000004332 silver Substances 0.000 title claims abstract description 13
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims description 17
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 30
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910001928 zirconium oxide Inorganic materials 0.000 claims abstract description 14
- 230000000737 periodic effect Effects 0.000 claims abstract description 6
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims abstract 8
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 7
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 239000010937 tungsten Substances 0.000 claims description 2
- 229910005507 FeWO4 Inorganic materials 0.000 claims 3
- GEIAQOFPUVMAGM-UHFFFAOYSA-N Oxozirconium Chemical compound [Zr]=O GEIAQOFPUVMAGM-UHFFFAOYSA-N 0.000 claims 1
- 238000003466 welding Methods 0.000 abstract description 8
- MOFOBJHOKRNACT-UHFFFAOYSA-N nickel silver Chemical compound [Ni].[Ag] MOFOBJHOKRNACT-UHFFFAOYSA-N 0.000 abstract description 4
- 239000000654 additive Substances 0.000 abstract description 3
- 230000000996 additive effect Effects 0.000 abstract description 3
- 239000000843 powder Substances 0.000 description 9
- 229910044991 metal oxide Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 229910017727 AgNi Inorganic materials 0.000 description 1
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 description 1
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- ASMQPJTXPYCZBL-UHFFFAOYSA-N [O-2].[Cd+2].[Ag+] Chemical compound [O-2].[Cd+2].[Ag+] ASMQPJTXPYCZBL-UHFFFAOYSA-N 0.000 description 1
- 229910000416 bismuth oxide Inorganic materials 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- OVMJVEMNBCGDGM-UHFFFAOYSA-N iron silver Chemical compound [Fe].[Ag] OVMJVEMNBCGDGM-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005551 mechanical alloying Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- IVQODXYTQYNJFI-UHFFFAOYSA-N oxotin;silver Chemical compound [Ag].[Sn]=O IVQODXYTQYNJFI-UHFFFAOYSA-N 0.000 description 1
- BPUBBGLMJRNUCC-UHFFFAOYSA-N oxygen(2-);tantalum(5+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ta+5].[Ta+5] BPUBBGLMJRNUCC-UHFFFAOYSA-N 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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
- the invention relates to a silver-based contact material for use in switching devices in power engineering, in particular for contact pieces in low-voltage switching devices, which contains at least iron oxide and zirconium oxide in addition to silver as active components.
- 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 (AgSnO 2 ).
- there may be other metal oxides such as, in particular, bismuth oxide (Bi 2 O 3 ), copper oxide (CuO) and / or tantalum oxide (Ta 2 O 5 ).
- 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 lifetime switching number on the one hand, which is determined by the erosion of the switching element, 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 is known, 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.
- 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.
- a material especially of the constitution AgFe 2 O 3 / Fe 3 O 4 ZrO 2 is characterized in addition to low contact heating, stable heating behavior, low tendency to weld and a long service life in particular by good corrosion resistance.
- the object of the invention is therefore to further improve a material based on silver, iron oxide and zirconium oxide.
- the object is according to the invention by adding a further 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 4 ).
- 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, the rest being 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 fractions 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 with 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 either extrude tapes or wires of the material as a semi-finished product for contact pads, or 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. 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 O 3 5.4 ZrO 2 l-FeWO 4 O, 4 material produced is compared in the table 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 are listed, which were measured under the same conditions on the 15 kW / contactor.
- the other contact properties of the materials correspond to the requirements for contactor applications.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Materials Engineering (AREA)
- Contacts (AREA)
Abstract
Description
Die Erfindung bezieht sich auf einen Kontaktwerkstoff auf Silberbasis zur Verwendung in Schaltgeräten der Energietechnik, insbesondere für Kontaktstücke in Niederspannungsschaltgeräten, der neben Silber als Wirkkomponenten zumindest Eisenoxid und Zirkonoxid enthält.The invention relates to a silver-based contact material for use in switching devices in power engineering, in particular for contact pieces in low-voltage switching devices, which contains at least iron oxide and zirconium oxide in addition to silver as active components.
Für Kontaktstücke in Niederspannungsschaltgeräten der Energietechnik, z.B. Leistungsschaltern sowie Gleichstrom- und Hilfsschützen, sind Kontaktwerkstoffe einerseits des Systems Silber-Metall (AgMe) und andererseits des Systems Silber-Metalloxid (AgMeO) bekannt. Vertreter des ersten Systems sind beispielsweise Silber-Nickel (AgNi) oder Silber-Eisen (AgFe); Vertreter des zweiten Systems sind insbesondere Silber-Cadmiumoxid (AgCdO) oder Silber-Zinnoxid (AgSnO2). Zu letzterem können weitere Metalloxide, wie insbesondere Wismutoxid (Bi2O3), Kupferoxid (CuO) und/oder Tantaloxid (Ta2O5), kommen.For contact pieces in low-voltage switching devices in energy technology, for example circuit breakers and direct current and auxiliary contactors, 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 (AgSnO 2 ). In addition to the latter, there may be other metal oxides, such as, in particular, bismuth oxide (Bi 2 O 3 ), copper oxide (CuO) and / or tantalum oxide (Ta 2 O 5 ).
Die praktische Verwendbarkeit eines Kontaktwerkstoffes auf Silber-Metall- bzw. Silber-Metalloxid-Basis wird durch das sogenannte elektrische Kontakteigenschaftsspektrum bestimmt. Maßgebliche Kenngrößen sind dabei die Lebensdauerschaltzahl einerseits, die durch den Abbrand des Schaltstückes bestimmt wird, und die sogenannte Übertemperatur andererseits, d.h. die Erwärmung einer Kontaktbrücke, welche sich im wesentlichen aus dem elektrischen Widerstand des genannten Kontaktaufbaus ergibt. Daneben sind eine hinreichend geringe Verschweißneigung der Kontaktstücke und weiterhin eine Korrosionsbeständigkeit wichtig, da insbesondere durch Langzeitkorrosion des Werkstoffes in Luftschaltgeräten sich die Schalteigenschaften mit der Zeit verändern können.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 lifetime switching number on the one hand, which is determined by the erosion of the switching element, 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.
Aus der DE-OS 41 17 311 ist ein Kontaktwerkstoff der eingangs genannten Art bekannt, bei dem als Wirkkomponenten in Kombination Eisenoxid in Massenanteilen zwischen 1 und 50 % und ein Oxid eines weiteren chemischen Elementes in Massenanteilen zwischen 0,01 und 5 % vorliegen. Als weiteres Metalloxid ist dort unter anderem Zirkonoxid genannt. Es hat sich gezeigt, daß speziell die Kombination von Eisenoxid und Zirkonoxid ein günstiges Schalteigenschaftsspektrum hat.From DE-OS 41 17 311 a contact material of the type mentioned is known, 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. 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.
Letzterer neue Werkstoff kann in vielen Anwendungsfällen vorteilhafterweise bisher verwendete Silber-Nickel-Werkstoffe ersetzen, die in zunehmendem Maße wegen der bei der Herstellung anfallenden Nickelstäube und deren Schadwirkungen auf den menschlichen Organismus als toxisch angesehen werden. Ein Werkstoff speziell der Konstitution AgFe2O3/ Fe3O4ZrO2 zeichnet sich neben geringer Kontakterwärmung, stabilem Erwärmungsverhalten, geringer Neigung zum Verschweißen und hoher Lebensdauer insbesondere auch durch eine gute Korrosionsbeständigkeit aus.The latter new material can, in many applications, advantageously replace silver-nickel materials previously used, which are increasingly regarded as toxic because of the nickel dusts produced during manufacture and their harmful effects on the human organism. A material especially of the constitution AgFe 2 O 3 / Fe 3 O 4 ZrO 2 is characterized in addition to low contact heating, stable heating behavior, low tendency to weld and a long service life in particular by good corrosion resistance.
Aufgabe der Erfindung ist es daher, eine Werkstoff auf der Basis von Silber, Eisenoxid und Zirkonoxid weiter zu verbessern.The object of the invention is therefore to further improve a material based on silver, iron oxide and zirconium oxide.
Die Aufgabe ist erfindungsgemäß durch einen Zusatz eines weiteren Oxides der sechsten Nebengruppe des Periodensystems und/oder eines Mischoxides, das aus Eisenoxid und dem Oxid eines Elementes der sechsten Nebengruppe des Periodensystems besteht. Vorzugsweise ist der Zusatz ein Mischoxid mit den Elementen Eisen und Wolfram, insbesondere ist der Zusatz Ferrowolframat (FeWO4).The object is according to the invention by adding a further 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 4 ).
Der erfindungsgemäße Werkstoff ist bezüglich der Wirkkomponenten vorzugsweise durch Massenanteile von 1 bis 50 % Eisenoxid und 0,1 bis 5 % Zirkonoxid mit einem Zusatz in Massenanteilen von 0,01 bis 5 % des weiteren Oxides, Rest Silber, gekennzeichnet. Speziell beim Zusatz von Ferrowolframat als weiteres Oxid ist der Werkstoff in Massenanteilen durch 2 bis 20 % Eisenoxid, 0,05 bis 5 % Zirkonoxid und 0,01 bis 2 % Ferrowolframat, Rest Silber gekennzeichnet. Dabei hat sich gezeigt, daß der Anteil an Ferrowolframat in Massenanteilen weniger als 1 %, insbesondere weniger als 0,05 % betragen kann.With regard to the active components, 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, the rest being silver. Especially when adding ferrotungstate as a further oxide, 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 fractions can be less than 1%, in particular less than 0.05%.
Untersuchungen haben ergeben, daß beim erfindungsgemäßen Kontaktwerkstoff das Einschaltvermögen hinsichtlich der Schweißgrenzstromstärke verbessert ist. Damit ergeben sich in überraschender Weise erweiterte Anwendungsmöglichkeiten als Silber-Nickel-Ersatzwerkstoffe.Investigations have shown that the switch-on capacity with regard to the welding limit current strength is improved in the contact material according to the invention. This surprisingly results in expanded application options as silver-nickel substitute materials.
Weitere Vorteile und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung von Beispielen, wobei insbesondere auf die Tabelle Bezug genommen wird.Further advantages and details of the invention result from the following description of examples, reference being made in particular to the table.
In der Tabelle ist das Einschaltvermögen für einen erfindungsgemäßen Werkstoff im Vergleich zu den Werkstoffen des Standes der Technik angegeben. Zur Messung dient in allen Fällen ein 15 kW Schütz.The table shows the switch-on capacity for a material according to the invention in comparison with the materials of the prior art. A 15 kW contactor is used for measurement in all cases.
Zur Herstellung eines Kontaktwerkstoffes AgFe2O35,4-ZrO2lFeWO40,4 werden entsprechend eingewogene Anteile von Silberpulver, Eisenoxidpulver, Zirkonoxidpulver und Ferrowolframat-Pulver gemischt. Dazu werden handelsübliche Oxidpulver von Eisen, Zirkon und Ferrowolframat verwendet.To produce a contact material AgFe 2 O 3 5,4-ZrO 2 lFeWO 4 0,4, appropriately weighed portions of silver powder, iron oxide powder, zirconium oxide powder and ferrotungstate powder are mixed. Commercial oxide powders of iron, zirconium and ferrotungstate are used for this.
Durch Naßmischen der Oxidpulver wird eine Pulvermischung zubereitet. Aus der Pulvermischung werden entweder durch Strangpressen Bänder bzw. Drähte des Werkstoffes als Halbzeug für Kontaktauflagen oder aber es werden unmittelbar durch sogenannte Formteiltechnik Kontaktstücke hergestellt. In beiden Fällen ist für eine sichere Verbindungstechnik mit dem Kontaktträger vorteilhaft, Zwei-Schicht-Bänder bzw. Zwei-Schicht-Kontaktstücke mit einer lötfähigen Silberschicht auf der Rückseite herzustellen.A powder mixture is prepared by wet mixing the oxide powders. The powder mixture is used to either extrude tapes or wires of the material as a semi-finished product for contact pads, or 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.
Bei der Herstellung des Werkstoffes können die Konzentrationen der einzelnen Wirkkomponenten variiert werden. Zur Herstellung geeigneter Pulvermischungen aus Silber, Eisenoxid, Zirkonoxid und Ferrowolframat kommt auch das sogenannte mechanische Legieren von Silber- und Einzeloxidpulvern in Frage. Dadurch werden die Gefügeeigenschaften des fertigen Werkstoffes vorteilhaft beeinflußt.When manufacturing the material, the concentrations of the individual active components can be varied. 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.
In der Tabelle wird der hergestellte AgFe2O35,4 ZrO2l-FeWO4O,4-Werkstoff mit zwei vom Stand der Technik vorbekannten Werkstoffen verglichen. Aufgeführt ist jeweils die Schweißgrenzstromstärke der Kontaktwerkstoffe bzw. die Stromtragfähigkeit des Gerätes, die unter gleichen Randbedingungen am 15 kW/Schütz gemessen wurde. Die übrigen Kontakteigenschaften der Werkstoffe entsprechen den für Schützanwendungen gestellten Anforderungen.The AgFe 2 O 3 5.4 ZrO 2 l-FeWO 4 O, 4 material produced is compared in the table 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 are listed, which were measured under the same conditions on the 15 kW / contactor. The other contact properties of the materials correspond to the requirements for contactor applications.
Aus der Tabelle ist entnehmbar, daß ein Werkstoff der Zusammensetzung AgFe2O35,4ZrO2l bereits eine höhere Schweißgrenzstromstärke als der üblicherweise verwendete AgNi2O Werkstoff hat. Wird diesem Werkstoff ein Zusatz von 0,4 % Massenanteilen FeWO4 zugegeben, so ist das Einschaltvermögen durch die Stromtragfähigkeit des Gerätes und nicht durch die Schweißgrenzstromstärke begrenzt. Die Schweißgrenzstromstärke ist mindestens um 20 % erhöht.
Claims (7)
- Silver-based contact material for use in switchgear pertaining to power engineering, in particular for contact pieces in low-voltage switches, which material in addition to silver (Ag) contains as active components at least iron oxide (Fe2O3/Fe3O4) and zirconium oxide (ZrO2), characterised by an addition of a further oxide of the sixth subgroup of the periodic system and/or a mixed oxide, which consists of iron oxide and the oxide of an element of the sixth subgroup of the periodic system.
- Contact material according to claim 1, characterised in that the addition is a mixed oxide having the elements iron (Fe) and tungsten (W).
- Contact material according to claim 2, characterised in that the addition is ferrotungstate (FeWO4).
- Contact material according to claim 1, characterised in that iron oxide (Fe2O3/Fe3O4) in mass fractions of 1 to 50 % and zirconium oxide (ZrO2) in mass fractions of 0.01 to 5 % and a further oxide in mass fractions of 0.01 to 5 % are provided as active components.
- Contact material according to claim 4, wherein the addition is ferrotungstate (FeWo4), characterised by mass fractions of 2 to 20 % iron oxide (Fe2O3/Fe3O4), 0.05 to 5 % zirconium oxide (ZrO) and 0.05 to 2 % ferrotungstate (FeWO4), remainder silver (Ag).
- Contact material according to claim 5, characterised in that the mass fraction of ferrotungstate (FeWO4) amounts to less than 1 %.
- Contact material according to claim 6, characterised in that the mass fraction of ferrotungstate (Fe3WO4) amounts to less than 0.5 m%.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4343550 | 1993-12-20 | ||
| DE4343550A DE4343550A1 (en) | 1993-12-20 | 1993-12-20 | Contact material based on silver for use in switching devices of power engineering |
| PCT/DE1994/001488 WO1995017758A1 (en) | 1993-12-20 | 1994-12-14 | Silver-based contact material for switchgears used in power engineering |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0736216A1 EP0736216A1 (en) | 1996-10-09 |
| EP0736216B1 true EP0736216B1 (en) | 1997-09-03 |
Family
ID=6505579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95902764A Expired - Lifetime EP0736216B1 (en) | 1993-12-20 | 1994-12-14 | Silver-based contact material for switchgears used in power engineering |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5663500A (en) |
| EP (1) | EP0736216B1 (en) |
| DE (2) | DE4343550A1 (en) |
| WO (1) | WO1995017758A1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19530512C1 (en) * | 1995-08-18 | 1996-10-17 | Siemens Ag | Electrical layered contact element used in weak current relays |
| DE19543208C1 (en) * | 1995-11-20 | 1997-02-20 | Degussa | Silver@-iron@ material contg. oxide additives |
| DE19543223C1 (en) * | 1995-11-20 | 1997-02-20 | Degussa | Silver@-iron@ material contg. oxide additives |
| DE19543222C1 (en) * | 1995-11-20 | 1997-02-20 | Degussa | Silver@-iron material contg. oxide additives |
| DE19608490C1 (en) * | 1996-03-05 | 1997-09-04 | Siemens Ag | Contact material made of silver and active components, molded part made therefrom and process for producing the molded part |
| ES2187801T3 (en) * | 1996-08-01 | 2003-06-16 | Metalor Technologies Int | PROCEDURE FOR MANUFACTURING A PRODUCT WITH A SILVER-BASED CONTACTING MATERIAL, CONTACT MATERIAL AND PRODUCT OBTAINED WITH THIS CONTACT MATERIAL. |
| US5903008A (en) * | 1997-07-02 | 1999-05-11 | General Electric Company | Scatter correction methods and systems in single photon emission computed tomography |
| JP4427058B2 (en) * | 2004-06-18 | 2010-03-03 | Ｔａｎａｋａホールディングス株式会社 | Sealed AC load relay and Ag contact element material used therefor |
| CN104475733A (en) * | 2014-12-30 | 2015-04-01 | 桂林电器科学研究院有限公司 | Preparation method of flake-like silver-nickel-tungsten electrical contact material |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3017424C2 (en) * | 1980-05-07 | 1987-01-15 | Degussa Ag, 6000 Frankfurt | Material for electrical contacts |
| YU46258B (en) * | 1987-06-06 | 1993-05-28 | Degussa Ag. | APPLICATION OF SILVER IRON MATERIAL FOR ELECTRICAL CONTACTS |
| DE4117311A1 (en) * | 1991-05-27 | 1992-12-03 | Siemens Ag | CONTACT MATERIAL ON A SILVER BASE FOR USE IN SWITCHGEAR DEVICES IN ENERGY TECHNOLOGY |
| DE4201940A1 (en) * | 1992-01-24 | 1993-07-29 | Siemens Ag | SINTER COMPOSITE FOR ELECTRICAL CONTACTS IN SWITCHGEAR OF ENERGY TECHNOLOGY |
-
1993
- 1993-12-20 DE DE4343550A patent/DE4343550A1/en not_active Withdrawn
-
1994
- 1994-12-14 US US08/669,463 patent/US5663500A/en not_active Expired - Fee Related
- 1994-12-14 DE DE59403995T patent/DE59403995D1/en not_active Expired - Fee Related
- 1994-12-14 WO PCT/DE1994/001488 patent/WO1995017758A1/en active IP Right Grant
- 1994-12-14 EP EP95902764A patent/EP0736216B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE59403995D1 (en) | 1997-10-09 |
| WO1995017758A1 (en) | 1995-06-29 |
| EP0736216A1 (en) | 1996-10-09 |
| US5663500A (en) | 1997-09-02 |
| DE4343550A1 (en) | 1995-06-22 |
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