EP0152606A2 - Contact material and production of electric contacts - Google Patents
Contact material and production of electric contacts Download PDFInfo
- Publication number
- EP0152606A2 EP0152606A2 EP84115754A EP84115754A EP0152606A2 EP 0152606 A2 EP0152606 A2 EP 0152606A2 EP 84115754 A EP84115754 A EP 84115754A EP 84115754 A EP84115754 A EP 84115754A EP 0152606 A2 EP0152606 A2 EP 0152606A2
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- tungsten
- material according
- silver
- contact
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- 239000000463 material Substances 0.000 title claims abstract description 86
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 6
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 28
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000010937 tungsten Substances 0.000 claims abstract description 21
- 229910052709 silver Inorganic materials 0.000 claims abstract description 20
- 239000004332 silver Substances 0.000 claims abstract description 17
- 239000000654 additive Substances 0.000 claims abstract description 12
- 229910052797 bismuth Inorganic materials 0.000 claims abstract description 10
- 229910052715 tantalum Inorganic materials 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 6
- 239000001301 oxygen Substances 0.000 claims abstract description 6
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims abstract description 6
- 150000003658 tungsten compounds Chemical class 0.000 claims abstract description 6
- 238000001125 extrusion Methods 0.000 claims abstract description 5
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 claims abstract description 4
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910001887 tin oxide Inorganic materials 0.000 claims abstract description 4
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052802 copper Inorganic materials 0.000 claims abstract description 3
- 239000010949 copper Substances 0.000 claims abstract description 3
- 229910052751 metal Inorganic materials 0.000 claims abstract description 3
- 239000002184 metal Substances 0.000 claims abstract description 3
- 150000002739 metals Chemical class 0.000 claims abstract description 3
- 229910006404 SnO 2 Inorganic materials 0.000 claims abstract 2
- 239000000843 powder Substances 0.000 claims description 15
- 238000003825 pressing Methods 0.000 claims description 6
- 238000005245 sintering Methods 0.000 claims description 5
- 239000011265 semifinished product Substances 0.000 claims description 3
- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical compound O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 claims description 2
- 230000000754 repressing effect Effects 0.000 claims description 2
- 229910001930 tungsten oxide Inorganic materials 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 9
- 230000002349 favourable effect Effects 0.000 description 8
- 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 6
- 229910001936 tantalum oxide Inorganic materials 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 230000000996 additive effect Effects 0.000 description 4
- 230000003628 erosive effect Effects 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 239000000969 carrier Substances 0.000 description 3
- 238000010310 metallurgical process Methods 0.000 description 3
- 229910052793 cadmium Inorganic materials 0.000 description 2
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 2
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium oxide Inorganic materials O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- PVADDRMAFCOOPC-UHFFFAOYSA-N oxogermanium Chemical compound [Ge]=O PVADDRMAFCOOPC-UHFFFAOYSA-N 0.000 description 2
- PQQKPALAQIIWST-UHFFFAOYSA-N oxomolybdenum Chemical compound [Mo]=O PQQKPALAQIIWST-UHFFFAOYSA-N 0.000 description 2
- IVQODXYTQYNJFI-UHFFFAOYSA-N oxotin;silver Chemical compound [Ag].[Sn]=O IVQODXYTQYNJFI-UHFFFAOYSA-N 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- NLVVTKDAQHDTHD-UHFFFAOYSA-N [O-2].[Ta+5].[Cd+2] Chemical compound [O-2].[Ta+5].[Cd+2] NLVVTKDAQHDTHD-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910000416 bismuth oxide Inorganic materials 0.000 description 1
- 239000012876 carrier material Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 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
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 229910000476 molybdenum oxide Inorganic materials 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 239000012925 reference material Substances 0.000 description 1
- 229910001923 silver oxide Inorganic materials 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- ZNOKGRXACCSDPY-UHFFFAOYSA-N tungsten trioxide Chemical compound O=[W](=O)=O ZNOKGRXACCSDPY-UHFFFAOYSA-N 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
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- 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
-
- 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
Definitions
- the invention relates to a material for electrical contacts, in particular for contact pieces in low-voltage switching devices, which consists of silver, tin oxide and other additives.
- the invention relates to a method for manufacturing contact pieces from this material and to the associated contact piece.
- contact materials based on silver metal oxides (AgMeO), in particular AgCdO, have proven to be particularly advantageous in the past.
- AgMeO silver metal oxides
- cadmium is known to be one of the toxic heavy metals and when the contact pieces Cd0 are burned off, it is also released to the surrounding area, efforts have been underway for some time to replace the Cd0 with other metal oxides.
- These materials are said to have an arc burn-up that is just as small, as well as low welding power and, in particular, low heating in the case of continuous current flow, like the known AgCdO materials for contact pieces.
- AgSn0 2 contacts have a lower erosion compared to AgCd0, which leads to an increased contact life. Therefore, the size of the required contact pieces can advantageously be reduced in comparison to AgCd0, as a result of which a not inconsiderable saving in silver is achieved.
- EP-B1-00 24 349 a material based on AgSn0 2 is known in which the excess temperature is reduced compared to the pure AgSn0 2 by adding tungsten oxide (W0 3 );
- EP-B1-00 39 429 proposes bismuth oxide (Bi 2 0 3 ) as a further additive, with which the welding force is to be influenced in a favorable manner without increasing the contact resistance.
- EP-A1-00 56 857 states that the overtemperature behavior can also allegedly be improved by molybdenum oxide (Mo03) and / or germanium oxide (Ge0 2 ).
- Mo03 molybdenum oxide
- Ge0 2 germanium oxide
- Mo03 deteriorates the erosion behavior of AgSn0 2 in such a way that the contact life falls far below that of AgCd0.
- These disadvantages do not occur when using Ge0 2 ; however, due to the high price of germanium oxide, which is a multiple of that of silver, the contact piece becomes significantly more expensive. This is the economic advantage when using AgSn0 2 , namely a saving of silver due to the low erosion hold against AgCdO, largely canceled.
- the object of the invention is therefore to develop an electrical contact material based on silver and tin oxide, in which the overtemperature is reduced compared to the known AgSn0 2 material by admixing further additives, neither deteriorating the contact life nor making the material excessively expensive .
- the additives in combination are oxides of the metals tantalum (Ta205), copper (Cu0) and bismuth (Bi 2 0 3 ).
- tungsten or oxygen-containing tungsten compounds can also be present.
- the new material contains 5 to 20 mass% Sn0 2 , 0.1 to 5 mass% Ta 2 O 5 , 0.1 to 5 mass% Cu0, 0.1 to 5 mass% Bi 2 O 3 and the rest silver. If tungsten is present, its proportion is 0.05 to 3% by mass.
- the invention shows in particular the advantageous property of tantalum oxide in connection with predetermined amounts of Cu0, Bi 2 0 3 and optionally tungsten in the case of contact materials based on silver-tin oxide.
- contact materials also contain tantalum oxide to use.
- tantalum is used either as cadmium tantalum oxide or as tantalum oxide in conjunction with at least germanium. Because of the favorable wetting properties of the tantalum oxide, the contact erosion is favorably influenced in the material there. It has not yet been recognized that tantalum oxide can be used as an additive in silver-tin oxide-based contact materials.
- the materials according to the invention can be produced by known powder metallurgical processes. For example, to manufacture contact pieces, the material is subjected to extrusion into a strip after sintering. Contact pieces cut from this tape can be hard-soldered onto the contact carriers of conventional switching devices.
- Powders of the components A g , Sn0 2 , Ta 2 0 5 , Cu0 and Bi 2 0 3 are used as starting materials, a composition in mass fractions of 91.4% Ag, 7.5% Sn02, 0.5% Ta 2 O 5 , 0.3% Cu0 and 0.3% B1203 is selected.
- the powder batch is mixed and then subjected to powder metallurgical process steps from pressing, sintering and post-pressing with the usual pressures and temperatures: For example, 200 MPa have been used for pressing the powder, for sintering 850 - 900 C at one hour in air and 600 MPa for repressing have been shown to be suitable values.
- a strip as a semi-finished product is produced from the blank by extrusion at 700 ° C, from which contact pieces with a parallel structure can be separated.
- the contact pieces manufactured in this way can be hard-soldered directly onto the contact carriers of a conventional switching device.
- Powders of the components are used as in Example 1, with a composition in proportions by mass of 87.7% Ag, 10.5% Sn0 2 , 0.8% Ta 2 0 5 , 0.5% Cu0 and 0.5% Bi 2 0 3 is selected.
- the further production steps correspond to those of Example 1.
- Powder of components A g , Sn0 2 , Ta 2 0 5 , CuO, Bi 2 0 3 and additionally powder of pure tungsten are used as starting materials. For example, a mixture with mass fractions of 91.7% Ag, 7.0% Sn0 2 , 0.5% Ta205, 0.3% CuO, 0.3% Bi 2 0 3 and 0.2% W is selected.
- the powder batch is mixed and then subjected to the usual powder metallurgical process steps from pressing, sintering and post-pressing.
- a strip as a semi-finished product is produced from the blank by extrusion, from which contact pieces with a parallel alignment structure can be separated.
- Powders of the components are used as in Example 3, but now a composition in bulk proportions with 87.5% Ag, 10.5% Sn0 2 , 0.8% Ta 2 0 59 0.5% CuO, 0.4% Bi 2 0 3 and 0.3% W is selected.
- the contact pieces were connected until the original button was remelted due to arcing. This required a few thousand switching operations. Under the highest continuous current load permitted for the switchgear, the temperature on the movable contact piece was measured directly below the contact pieces. It has been shown that the influence of the contact material can best be detected at this point.
- the measured temperatures at the terminals via the V are ertechnische Kunststoff AgSn0 2 W0 3 11.5 0.5 33% higher than for AgCd012, while the pure AgSn02 plant Taffe by more than 44% higher. It can be seen that the materials according to the invention have excess temperatures which are between 7 and 23% lower than that of Comparative material AgSn0 2 11.5 W0 3 0.5 and thus at best reach the temperatures of AgCd0.
- the materials according to the invention with added tungsten compared to AgSn0 2 11.5 W0 3 0.5 have a longer lifespan at a lower excess temperature, while the materials according to the invention without tungsten are characterized by a lack of material displacement, very favorable excess temperature and a longer lifespan compared to AgCd0, which however are not completely reached the values of AgSn0 2 11.5 W0 3 0.5.
- the percentage composition of the material with the special oxide combination Sn0 2 , Ta 2 0 5 , Cu0 and B1 2 0 3 and optionally W can be varied further.
- Bi203 and optionally 0.05 to 1% by mass tungsten can be added either as pure tungsten or as tungsten oxide (WO 3 ) or other oxygen-containing tungsten compounds without the properties of the contact material being impaired.
- the material costs of the individual additional components are only about 40% compared to Ge0 2, which has so far been found to be particularly favorable. This enables the object of the invention to create an inexpensive contact material with favorable temperature behavior. Overall, suitable contact pieces for switching devices can now be produced.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Composite Materials (AREA)
- Contacts (AREA)
Abstract
Die Erfindung bezieht sich auf einen Werkstoff für elektrische Kontakte, insbesondere für Kontaktstücke in Niederspannungsschaltgeräten, welche aus Silber, Zinnoxid und weiteren Zusätzen besteht. Es wird nach einem Werkstoff gesucht, bei dem insbesondere die Übertemperatur gegenüber dem bekannten AgSnO2-Werkstoff gesenkt wird. Gemäß der Erfindung sind die weiteren Zusätze in Kombination Oxide der Metalle Tantal (Ta2O5), Kupfer (Cu0) und Wismut (Bi2O3). Weiterhin kann der Werkstoff auch Wolfram oder sauerstoffhaltige Wolframverbindungen enthalten. Vorzugsweise enthält der Werkstoff 5 bis 20 Masse-% SnO2, 0,1 bis 5 Masse-% Ta2O5 0,1 bis 5 Masse-% CuO, 0,1 bis 5 Masse-% Bi2O3, gegebenenfalls 0,05 bis 3 Masse-% Wolfram sowie als Rest Silber. Überraschenderweise wird die Übertemperatur am Kontakt bei Einsatz solcher Werkstoffe als Kontaktstück für Niederspannungsschaltgeräte deutlich reduziert. Beim Verfahren zum Erzeugen von Kontaktstükken folgt der pulvermetallurgischen Herstellung des Werkstoffes ein Strangpressen zu einem Band, aus dem Kontaktstücke abtrennbar sind, die ein kantenparalleles Richtgefüge aufweisen.The invention relates to a material for electrical contacts, in particular for contact pieces in low-voltage switching devices, which consists of silver, tin oxide and other additives. The company is looking for a material in which, in particular, the excess temperature is reduced compared to the known AgSnO 2 material. According to the invention, the further additives in combination are oxides of the metals tantalum (Ta 2 O 5 ), copper (Cu0) and bismuth (Bi 2 O 3 ). Furthermore, the material can also contain tungsten or oxygen-containing tungsten compounds. The material preferably contains 5 to 20% by mass of SnO 2 , 0.1 to 5% by mass of Ta 2 O 5 0.1 to 5% by mass of CuO, 0.1 to 5% by mass of Bi 2 O 3 , optionally 0 , 05 to 3% by mass of tungsten and the remainder silver. Surprisingly, the excess temperature at the contact is significantly reduced when such materials are used as a contact piece for low-voltage switching devices. In the process for producing contact pieces, the powder-metallurgical production of the material is followed by extrusion into a strip, from which contact pieces can be separated, which have a directional structure parallel to the edges.
Description
Die Erfindung bezieht sich auf einen Werkstoff für elektrische Kontakte, insbesondere für Kontaktstücke in Niederspannungsschaltgeräten, welcher aus Silber, Zinnoxid und weiteren Zusätzen besteht. Daneben bezieht sich die Erfindung auf ein Verfahren zum Fertigen von Kontaktstücken aus diesem Werkstoff sowie auf das zugehörige Kontaktstück.The invention relates to a material for electrical contacts, in particular for contact pieces in low-voltage switching devices, which consists of silver, tin oxide and other additives. In addition, the invention relates to a method for manufacturing contact pieces from this material and to the associated contact piece.
Für Niederspannungsschaltgeräte der Energietechnik, z.B. in Schützen oder Selbstschaltern, haben sich in der Vergangenheit Kontaktwerkstoffe auf der Basis von Silbermetalloxiden (AgMeO), insbesondere AgCdO, als besonders vorteilhaft erwiesen. Da aber Cadmium bekanntermaßen zu den toxischen Schwermetallen zählt und beim Abbrand der Kontaktstücke Cd0 auch an die nähere Umgebung abgegeben wird, sind seit einiger Zeit Bestrebungen im Gange, das Cd0 durch andere Metalloxide zu ersetzen. Diese Werkstoffe sollen einen ebenso kleinen Abbrand im Lichtbogen, sowie geringe Schweißkraft und insbesondere niedrige Erwärmung bei Dauerstromführung wie die bekannten AgCdO-Werkstoffe für Kontaktstücke aufweisen.For low-voltage switchgear in energy technology, e.g. In contactors or automatic switches, contact materials based on silver metal oxides (AgMeO), in particular AgCdO, have proven to be particularly advantageous in the past. However, since cadmium is known to be one of the toxic heavy metals and when the contact pieces Cd0 are burned off, it is also released to the surrounding area, efforts have been underway for some time to replace the Cd0 with other metal oxides. These materials are said to have an arc burn-up that is just as small, as well as low welding power and, in particular, low heating in the case of continuous current flow, like the known AgCdO materials for contact pieces.
Es wurde bisher versucht, das Cadmium durch Zinn oder Zink zu ersetzen. Die bisher bekannten Vorschläge mit AgSn02- und AgZnO-Kontaktwerkstoffen konnten jedoch insgesamt nicht die hochwertigen Eigenschaften von AgCdO-Kontaktstücken erreichen. Insbesondere bei AgSn02 als Alternativwerkstoff zu AgCd0 hat sich gezeigt, daß dieser aufgrund der höheren thermischen Stabilität von Sn02 nach Schaltbelastungen durch Bildung von Oxid-Deckschichten einen gegenüber AgCd0 erhöhten Übergangswiderstand aufweist. Dadurch treten aber beim eingeschalteten, d.h. im stromführenden, Zustand des Schaltgerätes, unzulässig hohe Temperaturen (Übertemperaturen) an den Kontaktstücken auf, die zu Schäden am Schaltgerät führen können. Andererseits weisen AgSn02-Kontakte gegenüber AgCd0 einen geringeren Abbrand auf, was zu einer erhöhten Kontaktlebensdauer führt. Daher kann vorteilhaft die Größe der benötigten Kontaktstücke im Vergleich zu AgCd0 verringert werden, wodurch eine nicht unerhebliche Silbereinsparung erzielt wird.So far, attempts have been made to replace the cadmium with tin or zinc. However, the previously known proposals with AgSn0 2 and AgZnO contact materials could not achieve the high-quality properties of AgCdO contact pieces. Especially with AgSn0 2 As an alternative material to AgCd0, it has been shown that due to the higher thermal stability of Sn0 2 after switching loads due to the formation of oxide cover layers, it has a higher contact resistance than AgCd0. As a result, however, when the switching device is switched on, that is to say when it is live, inadmissibly high temperatures (excess temperatures) occur at the contact pieces, which can lead to damage to the switching device. On the other hand, AgSn0 2 contacts have a lower erosion compared to AgCd0, which leads to an increased contact life. Therefore, the size of the required contact pieces can advantageously be reduced in comparison to AgCd0, as a result of which a not inconsiderable saving in silver is achieved.
Aus der EP-B1-00 24 349 ist ein Werkstoff auf der Basis von AgSn02 bekannt, bei dem durch Zusatz von Wolframoxid (W03) die Übertemperatur gegenüber dem reinen AgSn02 gesenkt wird; daneben wird mit der EP-B1-00 39 429 als weiterer Zusatz Wismutoxid (Bi203) vorgeschlagen, womit die SchweiBkraft günstig beeinflußt werden soll, ohne den Kontaktwiderstand zu erhöhen.From EP-B1-00 24 349 a material based on AgSn0 2 is known in which the excess temperature is reduced compared to the pure AgSn0 2 by adding tungsten oxide (W0 3 ); In addition, EP-B1-00 39 429 proposes bismuth oxide (Bi 2 0 3 ) as a further additive, with which the welding force is to be influenced in a favorable manner without increasing the contact resistance.
Darüber hinaus wird in der EP-A1-00 56 857 ausgeführt, daß das Übertemperaturverhalten angeblich auch durch Molybdänoxid (Mo03) und/oder Germaniumoxid (Ge02) verbessert werden kann. Es hat sich jedoch gezeigt, daß der Zusatz von Mo03 das Abbrandverhalten von AgSn02 derart verschlechtert, daß die Kontaktlebensdauer weit unter die von AgCd0 abfällt. Diese Nachteile treten zwar beim Einsatz von Ge02 nicht auf; allerdings wird aufgrund des hohen Preises von Germaniumoxid,der ein Mehrfaches von dem des Silbers beträgt, das Kontaktstück deutlich teuerer. Damit wird der wirtschaftliche Vorteil bei Einsatz von AgSn02, nämlich einer Einsparung von Silber aufgrund des günstigen Abbrandverhaltens gegenüber AgCdO, weitgehend wieder aufgehoben.In addition, EP-A1-00 56 857 states that the overtemperature behavior can also allegedly be improved by molybdenum oxide (Mo03) and / or germanium oxide (Ge0 2 ). However, it has been shown that the addition of Mo03 deteriorates the erosion behavior of AgSn0 2 in such a way that the contact life falls far below that of AgCd0. These disadvantages do not occur when using Ge0 2 ; however, due to the high price of germanium oxide, which is a multiple of that of silver, the contact piece becomes significantly more expensive. This is the economic advantage when using AgSn0 2 , namely a saving of silver due to the low erosion hold against AgCdO, largely canceled.
Aufgabe der Erfindung ist es daher, einen elektrischen Kontaktwerkstoff auf der Basis von Silber und Zinnoxid zu entwickeln, bei dem durch Beimischung weiterer Zusätze die Übertemperatur gegenüber dem bekannten AgSn02-Werkstoff gesenkt wird, wobei weder die Kontaktlebensdauer verschlechtert noch der Werkstoff übermäßig verteuert werden soll.The object of the invention is therefore to develop an electrical contact material based on silver and tin oxide, in which the overtemperature is reduced compared to the known AgSn0 2 material by admixing further additives, neither deteriorating the contact life nor making the material excessively expensive .
Die Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Zusätze in Kombination Oxide der Metalle Tantal (Ta205), Kupfer (Cu0) und Wismut (Bi203) sind. Gegebenenfalls können zusätzlich Wolfram oder sauerstoffhaltige Wolframverbindungen vorhanden sein.The object is achieved in that the additives in combination are oxides of the metals tantalum (Ta205), copper (Cu0) and bismuth (Bi 2 0 3 ). Optionally, tungsten or oxygen-containing tungsten compounds can also be present.
Bei praktischer Realisierung enthält der neue Werkstoff 5 bis 20 Masse-% Sn02, 0,1 bis 5 Masse-% Ta2O5, 0,1 bis 5 Masse-% Cu0, 0,1 bis 5 Masse-% Bi2O3 sowie als Rest Silber. Sofern Wolfram vorhanden ist beträgt dessen Anteil 0,05 bis 3 Masse-%.In practical implementation, the new material contains 5 to 20 mass% Sn0 2 , 0.1 to 5 mass% Ta 2 O 5 , 0.1 to 5 mass% Cu0, 0.1 to 5 mass% Bi 2 O 3 and the rest silver. If tungsten is present, its proportion is 0.05 to 3% by mass.
Die Erfindung zeigt insbesondere die vorteilhafte Eigenschaft des Tantaloxides in Verbindung mit vorgegebenen Mengen Cu0, Bi203 und gegebenenfalls Wolfram bei Kontaktwerkstoffen auf Silber-Zinnoxid-Basis.Zwar wurde bereits mit der WO-A1-80/01434 vorgeschlagen, in Kontaktwerkstoffen auch Tantaloxid zu verwenden. Allerdings wird beim Stand der Technik das Tantal entweder als Cadmiumtantaloxid oder als Tantaloxid in Verbindung mit wenigstens Germanium eingesetzt. Aufgrund der günstigen Benetzungseigenschaften des Tantaloxids wird beim dortigen Werkstoff der Kontaktabbrand günstig beeinflußt. Nicht erkannt wurde bisher, daß Tantaloxid als Zusatz in Kontaktwerkstoffen auf Silber-Zinnoxid-Basis verwendet werden kann.The invention shows in particular the advantageous property of tantalum oxide in connection with predetermined amounts of Cu0, Bi 2 0 3 and optionally tungsten in the case of contact materials based on silver-tin oxide. Although WO-A1-80 / 01434 has already proposed that contact materials also contain tantalum oxide to use. However, in the prior art, tantalum is used either as cadmium tantalum oxide or as tantalum oxide in conjunction with at least germanium. Because of the favorable wetting properties of the tantalum oxide, the contact erosion is favorably influenced in the material there. It has not yet been recognized that tantalum oxide can be used as an additive in silver-tin oxide-based contact materials.
Mit der Erfindung wurden nun Werkstoffe aufgefunden, die wenigstens die gleiche Lebensdauer wie ein AgCd0-Werkstoff und etwa die gleiche Lebensdauer wie ein AgSn02-Werkstoff mit W03-Zusatz hat. Überraschenderweise liegt aber beim neuen Werkstoff einerseits die Übertemperatur um 7 bis 23 % niedriger als bei AgSn0211,5 WO30,5; andererseits hat die Schweißkraft etwa vergleichbare Werte wie die von bekannten AgCdO-Werkstoffen. Je nach Anwendungsfall bzw. Schaltgerätetyp läßt sich nunmehr ein optimierter Werkstoff mit niedriger Übertemperatur und trotzdem ausreichender Lebensdauer einsetzen.With the invention, materials have now been found that have at least the same lifespan as an AgCd0 material and approximately the same lifespan as an AgSn0 2 material with a W0 3 additive. Surprisingly, on the one hand, the excess temperature in the new material is 7 to 23% lower than in AgSn0 2 11.5 WO 3 0.5; on the other hand, the welding force has values comparable to those of known AgCdO materials. Depending on the application or type of switchgear, an optimized material with low overtemperature and a sufficient service life can now be used.
Die erfindungsgemäßen Werkstoffe lassen sich nach bekannten pulvermetallurgischen Verfahren herstellen. Beispielsweise wird zur Fertigung von Kontaktstücken der Werkstoff nach der Sinterung einem Strangpressen zu einem Band unterzogen. Aus diesem Band geschnittene Kontaktstücke können auf die Kontaktträger der herkömmlichen Schaltgeräte hart aufgelötet werden.The materials according to the invention can be produced by known powder metallurgical processes. For example, to manufacture contact pieces, the material is subjected to extrusion into a strip after sintering. Contact pieces cut from this tape can be hard-soldered onto the contact carriers of conventional switching devices.
Anhand von Beispielen wird die Erfindung im einzelnen erläutert:The invention is explained in detail using examples:
Als Ausgangsmaterialien werden Pulver der Komponenten Ag, Sn02, Ta205, Cu0 und Bi203 verwendet, wobei eine Zusammensetzung in Massenanteilen von 91,4 % Ag, 7,5 % Sn02, 0,5 % Ta2O5, 0,3 % Cu0 und 0,3 % B1203 gewählt wird.Powders of the components A g , Sn0 2 , Ta 2 0 5 , Cu0 and Bi 2 0 3 are used as starting materials, a composition in mass fractions of 91.4% Ag, 7.5% Sn02, 0.5% Ta 2 O 5 , 0.3% Cu0 and 0.3% B1203 is selected.
Der Pulveransatz wird gemischt und anschließend pulvermetallurgischen Verfahrensschritten aus Pressen, Sintern und Nachpressen mit üblichen Drucken und Temperaturen unterzogen: Beispielsweise haben sich für das Pressen des Pulvers 200 MPa, für das Sintern 850 - 900 C bei einer Stunde an Luft und für das Nachpressen 600 MPa als geeignete Werte erwiesen. Aus dem Rohling wird durch Strangpressen bei 700 °C ein Band als Halbzeug erzeugt, von dem Kontaktstücke mit kantenparallelem Richtgefüge abgetrennt werden können.The powder batch is mixed and then subjected to powder metallurgical process steps from pressing, sintering and post-pressing with the usual pressures and temperatures: For example, 200 MPa have been used for pressing the powder, for sintering 850 - 900 C at one hour in air and 600 MPa for repressing have been shown to be suitable values. A strip as a semi-finished product is produced from the blank by extrusion at 700 ° C, from which contact pieces with a parallel structure can be separated.
Die so gefertigten Kontaktstücke können direkt auf die Kontaktträger eines herkömmlichen Schaltgerätes hart aufgelötet werden.The contact pieces manufactured in this way can be hard-soldered directly onto the contact carriers of a conventional switching device.
Es werden Pulver der Komponenten wie bei Beispiel 1 verwendet, wobei eine Zusammensetzung in Massenanteilen von 87,7 % Ag, 10,5 % Sn02, 0,8 % Ta205, 0,5 % Cu0 und 0,5 % Bi203 gewählt wird. Die weiteren Herstellungsschritte entsprechen denen von Beispiel 1.Powders of the components are used as in Example 1, with a composition in proportions by mass of 87.7% Ag, 10.5% Sn0 2 , 0.8% Ta 2 0 5 , 0.5% Cu0 and 0.5% Bi 2 0 3 is selected. The further production steps correspond to those of Example 1.
Als Ausgangsmaterialien werden wiederum Pulver der Komponenten Ag, Sn02, Ta205, CuO, Bi203 und zusätzlich Pulver aus reinem Wolfram verwendet. Beispielsweise wird eine Mischung mit Massenanteilen von 91,7 % Ag, 7,0 % Sn02, 0,5 % Ta205, 0,3 % CuO, 0,3 % Bi203 und 0,2 % W gewählt. Der Pulveransatz wird gemischt und anschließend den üblichen pulvermetallurgischen Verfahrensschritten aus Pressen, Sintern und Nachpressen unterzogen. Aus dem Rohling wird durch Strangpressen ein Band als Halbzeug erzeugt, von dem Kontaktstücke mit kantenparallelem Richtgefüge abgetrennt werden können.Powder of components A g , Sn0 2 , Ta 2 0 5 , CuO, Bi 2 0 3 and additionally powder of pure tungsten are used as starting materials. For example, a mixture with mass fractions of 91.7% Ag, 7.0% Sn0 2 , 0.5% Ta205, 0.3% CuO, 0.3% Bi 2 0 3 and 0.2% W is selected. The powder batch is mixed and then subjected to the usual powder metallurgical process steps from pressing, sintering and post-pressing. A strip as a semi-finished product is produced from the blank by extrusion, from which contact pieces with a parallel alignment structure can be separated.
Es werden Pulver der Komponenten wie bei Beispiel 3 verwendet, wobei jetzt eine Zusammensetzung in Massenanteilen mit 87,5 % Ag, 10,5 % Sn02, 0,8 % Ta2059 0,5 % CuO, 0,4 % Bi203 und 0,3 % W gewählt wird.Powders of the components are used as in Example 3, but now a composition in bulk proportions with 87.5% Ag, 10.5% Sn0 2 , 0.8% Ta 2 0 59 0.5% CuO, 0.4% Bi 2 0 3 and 0.3% W is selected.
Aus diesen Werkstoffen gefertigte Kontaktstücke wurden auf die Kontaktträger eines herkömmlichen Schaltgerätes hart aufgelötet.Contact pieces made from these materials were hard-soldered onto the contact carriers of a conventional switching device.
Die Kontaktstücke wurden solange beschaltet, bis die ursprüngliche Schaltfläche durch Lichtbogeneinwirkung überall umgeschmolzen war. Dazu waren einige tausend Schaltspiele notwendig. Unter der höchsten, für das Schaltgerät zulässigen Dauerstrombelastung wurde zunächst die Temperatur am beweglichen Schaltstück direkt unterhalb der Kontaktstücke gemessen. Es hat sich gezeigt, daß an dieser Stelle der Einfluß des Kontaktwerkstoffes am besten erfaßt werden kann.The contact pieces were connected until the original button was remelted due to arcing. This required a few thousand switching operations. Under the highest continuous current load permitted for the switchgear, the temperature on the movable contact piece was measured directly below the contact pieces. It has been shown that the influence of the contact material can best be detected at this point.
Die oben beschriebenen Werkstoffe wurden einerseits mit einem AgCd012-Werkstoff und zusatzfreien AgSn02-Werkstoffen und andererseits mit dem aus der EP-B1-00 24 349 bekannten AgSn0211,5 W03-Werkstoff verglichen, der nach dem dort beschriebenen Verfahren hergestellt wurde. Die Ergebnisse sind in der Tabelle zusammengestellt. Aufgetragen und für die einzelnen Werkstoffe die Maximalwerte speziell der Klemmenübertemperaturen, die durch die Übertemperatur am Schaltstück entstehen, sowie die AC 4-Lebensdauerschaltzahlen.The materials described above were compared on the one hand with an AgCd012 material and additive-free AgSn0 2 materials and on the other hand with the AgSn0 2 11.5 W0 3 material known from EP-B1-00 24 349, which was produced by the process described there . The results are summarized in the table. The maximum values, in particular of the terminal overtemperature caused by the overtemperature on the contact, as well as the AC 4 service life switching numbers are plotted and for the individual materials.
Wie aus der Tabelle ersichtlich, liegen die an den Anschlußklemmen gemessenen Übertemperaturen für den Vergleichswerkstoff AgSn0211,5 W030,5 um 33 % höher als für AgCd012, während die reinen AgSn02-Werkstaffe um mehr als 44 % höher liegen. Es zeigt sich, daß die erfindungsgemäßen Werkstoffe Übertemperaturen aufweisen, die zwischen 7 und 23 % niedriger sind als die des Vergleichswerkstoffes AgSn0211,5 W030,5 und damit günstigstenfalls bis an die Temperaturen von AgCd0 heranreichen.As can be seen from the table, the measured temperatures at the terminals via the V are ergleichswerkstoff AgSn0 2 W0 3 11.5 0.5 33% higher than for AgCd012, while the pure AgSn02 plant Taffe by more than 44% higher. It can be seen that the materials according to the invention have excess temperatures which are between 7 and 23% lower than that of Comparative material AgSn0 2 11.5 W0 3 0.5 and thus at best reach the temperatures of AgCd0.
Aus dem direkten Vergleich mit AgSn0212 bzw. AgSn028 kann, bezogen auf vergleichbaren Gesamtoxidgehalt, die temperatursenkende Wirkung der erfindungsgemäßen Zusätze ersehen werden. Auffällig ist, daß die erfindungsgemäßen Werkstoffe mit niedrigem Oxidgehalt ebenso wie die ohne Wolfram-Zusatz zu einer etwas niedrigeren Übertemperatur neigen. Aus dem Lebensdauervergleich ist zu ersehen, daß alle AgSn02-Werkstoffe trotz der Volumenreduzierung um ca. 20 % gegenüber AgCd012 eine höhere Schaltzahl erreichen. Dabei liegen die erfindungsgemässen Werkstoffe mit Wolframzusatz sogar noch über dem Vergleichswerkstoff AgSnO?11,5 W030,5, während die erfindungsgemäßen Werkstoffe ohne Wolfram vergleichbare Schaltzahlen wie die entsprechenden reinen AgSn02-Werkstoffe erreichen, sich jedoch durch das günstigste Übertemperaturverhalten aller untersuchten AgSn02-Werkstoffe (bei gleichem Oxidgehalt) auszeichnen.From direct comparison with AgSn0 2 12 or AgSn0 2 8, based on comparable total oxide content, the temperature-lowering effect of the additives according to the invention can be seen. It is striking that the materials according to the invention with a low oxide content, as well as those without the addition of tungsten, tend to have a somewhat lower excess temperature. From the life cycle comparison it can be seen that all AgSn0 2 materials achieve a higher number of operations in spite of the volume reduction of approx. 20% compared to AgCd012. The materials according to the invention with added tungsten are even higher than the reference material AgSnO ? 11.5 W0 3 0.5, while the materials according to the invention without tungsten achieve switching numbers comparable to the corresponding pure AgSn0 2 materials, but are characterized by the most favorable overtemperature behavior of all investigated AgSn0 2 materials (with the same oxide content).
Versuche mit wolframhaltigen AgSn02-Kontaktwerkstoffen in verschiedenen Schaltgeräten bestätigen zwar das günstige Lebensdauerverhalten im Allgemeinen, bei bestimmten Wechselstromschaltgeräten können jedoch Materialverlagerungen auftreten, die zu einem vorzeitigen Versagen des Schaltgerätes führen. Dabei wird Kontaktmaterial von dem einen Schaltstück auf das gegenüberliegende übertragen, so daß das materialabgebende Schaltstück die Lebensdauer des Schaltgerätes durch Durchschalten auf den Trägerwerkstoff vor Erreichen der vorgeschriebenen Schaltzahl begrenzt. Die Ursachen dieser Materialverlagerung sind bisher nicht bekannt, scheinen aber mit dem Zusatz von Wolfram oder sauerstoffhaltigen Wolframverbindungen im Zusammenhang zu stehen, da sie bei wolframfreien AgSn02-Werkstoffen bisher nicht auftraten. Aus diesen Gründen muß vor Einsatz der wolframhaltigen AgSn02-Werkstoffe zunächst das Verhalten bezüglich Materialverlagerung geprüft werden. Alternativ kann bei Auftreten der Materialverlagerung der erfindungsgemäße Werkstoff ohne Wolfram- zusatz als Ersatz für AgCd0 eingesetzt werden, der bei einer Volumenreduzierung um ca. 20 % gegenüber AgCd0 noch ein günstiges Abbrandverhalten aufweist.Experiments with tungsten-containing AgSn0 2 contact materials in various switching devices confirm the favorable service life behavior in general, but with certain AC switching devices material shifting can occur which lead to premature failure of the switching device. In this case, contact material is transferred from one contact piece to the opposite, so that the material-releasing contact piece limits the service life of the switching device by switching through to the carrier material before the prescribed number of switching operations has been reached. The causes of this material shift are not yet known, but seem to be related to the addition of tungsten or oxygen-containing tungsten compounds, as they have not previously occurred with tungsten-free AgSn0 2 materials. For these reasons, the behavior with regard to material displacement must first be checked before using the tungsten-containing AgSn0 2 materials. Alternatively, when the material shift occurs, the material according to the invention can be used as a substitute for AgCd0 without tungsten additive, which still has a favorable burning behavior with a volume reduction of approximately 20% compared to AgCd0.
Insgesamt weisen die erfindungsgemäßen Werkstoffe mit Wolframzusatz gegenüber AgSn0211,5 W030,5 eine höhere Lebensdauer bei niedrigerer Übertemperatur auf, während sich die erfindungsgemäßen Werkstoffe ohne Wolfram durch fehlende Materialverlagerung, sehr günstige Übertemperatur und gegenüber AgCd0 höhere Lebensdauer auszeichnen, die jedoch nicht ganz die Werte von AgSn0211,5 W030,5 erreicht.Overall, the materials according to the invention with added tungsten compared to AgSn0 2 11.5 W0 3 0.5 have a longer lifespan at a lower excess temperature, while the materials according to the invention without tungsten are characterized by a lack of material displacement, very favorable excess temperature and a longer lifespan compared to AgCd0, which however are not completely reached the values of AgSn0 2 11.5 W0 3 0.5.
Es kann also belegt werden, daß die Mittelwerte der bei den erfindungsgemäßen Werkstoffen gemessenen Temperaturen erheblich unterhalb der Meßwerte beim AgSn0211,5 W030,5-Werkstoff liegen. Dieses Ergebnis ist umso überraschender, da nunmehr die bisher als unvermeidbar erachteten Materialwanderungen besser beherrscht werden können. Die Schweißkraft ergab bei allen Werkstoffen Werte in gleicher Größenordnung wie beim früher verwendeten AgCdO-Werkstoff.It can thus be demonstrated that the mean values of the temperatures measured for the materials according to the invention are considerably below the measured values for the AgSn0 2 11.5 W0 3 0.5 material. This result is all the more surprising since it is now possible to better manage material migration that was previously considered inevitable. The welding power for all materials resulted in values of the same order of magnitude as for the AgCdO material previously used.
In weiteren Beispielen kann die prozentuale Zusammensetzung des Werkstoffes mit der speziellen Oxidkombination Sn02, Ta205, Cu0 und B1203 sowie gegebenenfallsW weiter variiert werden. Insbesondere können die prozentualen Verteilungen neben Silber bei 8 bis 14 Masse-% Sn02, 0,2 bis 1,5 Masse-% Ta205, 0,2 bis 1,5 Masse-% Cu0, 0,1 bis 1,2 Masse-% Bi203 und gegebenenfalls 0,05 bis 1 Masse-% Wolfram liegen. Zu letzterem hat sich gezeigt, daß das Wolfram entweder als Reinwolfram oder als Wolframoxid (W03) bzw. andere sauerstoffhaltige Wolframverbindungen zugesetzt werden kann, ohne daß die Eigenschaften des Kontaktwerkstoffes beeinträchtigt werden.In further examples, the percentage composition of the material with the special oxide combination Sn0 2 , Ta 2 0 5 , Cu0 and B1 2 0 3 and optionally W can be varied further. In particular, the percentage distributions in addition to silver at 8 to 14% by mass Sn02, 0.2 to 1.5% by mass Ta 2 0 5 , 0.2 to 1.5% by mass Cu0, 0.1 to 1.2 % By mass Bi203 and optionally 0.05 to 1% by mass tungsten. For the latter, it has been shown that the tungsten can be added either as pure tungsten or as tungsten oxide (WO 3 ) or other oxygen-containing tungsten compounds without the properties of the contact material being impaired.
Das überraschende Auftreten einer Verringerung der Übertemperatur am Kontaktstück bei Verwendung von Tantaloxid hat sich auch gezeigt bei Werkstoffen, die neben Silber 5 bis 20 Masse-% Sn02, 0,1 bis 5 Masse-% Ta205, 0,1 bis 5 Masse-% CuO, 0,1 bis 5 Masse-% Bi203 und gegebenenfalls 0,05 bis 3 Masse-% W enthält.The surprising occurrence of a decrease of the excess temperature at the contact part with the use of tantalum oxide has also been shown for materials which, in addition Silver 5 to 20% Sn0 2, 0.1 to 5 mass% Ta205, 0, 1 to 5 mass% CuO, 0.1 to 5 mass% Bi 2 0 3 and optionally 0.05 to 3 mass% W contains.
Bei den erfindungsgemäßen Werkstoffen ist vorteilhaft, daß die Materialkosten der einzelnen Zusatzkomponenten gegenüber dem bisher als besonders günstig herausgestellten Ge02 nur etwa 40 % betragen. Damit läßt sich das Ziel der Erfindung, einen preisgünstigen Kontaktwerkstoff mit günstigem Temperaturverhalten zu schaffen, erreichen. Insgesamt lassen sich nunmehr geeignete Kontaktstücke für Schaltgeräte erzeugen.
Claims (16)
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3403115 | 1984-01-30 | ||
| DE3403115 | 1984-01-30 | ||
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| DE3428070 | 1984-07-30 |
Publications (3)
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| EP0152606A2 true EP0152606A2 (en) | 1985-08-28 |
| EP0152606A3 EP0152606A3 (en) | 1985-09-25 |
| EP0152606B1 EP0152606B1 (en) | 1987-09-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP84115754A Expired EP0152606B1 (en) | 1984-01-30 | 1984-12-18 | Contact material and production of electric contacts |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US4565590A (en) |
| EP (1) | EP0152606B1 (en) |
| DE (1) | DE3466122D1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110643847A (en) * | 2019-10-18 | 2020-01-03 | 宁波汉博贵金属合金有限公司 | Preparation method of silver tin oxide electric contact material |
| CN112760513A (en) * | 2020-12-30 | 2021-05-07 | 宁波东大神乐电工合金有限公司 | Silver tin oxide electrical contact material and preparation process thereof |
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| DE3304637A1 (en) * | 1983-02-10 | 1984-08-16 | Siemens AG, 1000 Berlin und 8000 München | SINTER CONTACT MATERIAL FOR LOW VOLTAGE SWITCHGEAR |
| DE3421758A1 (en) * | 1984-06-12 | 1985-12-12 | Siemens AG, 1000 Berlin und 8000 München | SINTER CONTACT MATERIAL FOR LOW VOLTAGE SWITCHGEAR IN ENERGY TECHNOLOGY AND METHOD FOR THE PRODUCTION THEREOF |
| JPS6355822A (en) * | 1986-08-26 | 1988-03-10 | 松下電工株式会社 | Contact material |
| US4904317A (en) * | 1988-05-16 | 1990-02-27 | Technitrol, Inc. | Erosion resistant Ag-SnO2 electrical contact material |
| EP0369283B1 (en) * | 1988-11-17 | 1994-09-14 | Siemens Aktiengesellschaft | Sintered contact material for low-tension switchgear, particularly for contactors |
| FR2639466B1 (en) * | 1988-11-22 | 1991-02-15 | Telemecanique | PROCESS FOR PREPARING AN ELECTRICAL CONTACT MATERIAL AND METHOD FOR MANUFACTURING A CONTACT ELEMENT INCORPORATING SUCH A MATERIAL |
| US5258052A (en) * | 1992-06-18 | 1993-11-02 | Advanced Metallurgy Incorporated | Powder metallurgy silver-tin oxide electrical contact material |
| US5569412A (en) * | 1994-08-18 | 1996-10-29 | E. I. Du Pont De Nemours And Company | Tin oxide based conductive powders and coatings |
| DE19503182C1 (en) * | 1995-02-01 | 1996-05-15 | Degussa | Sintered material used as electrical contacts for switching amperage rating |
| US5846288A (en) * | 1995-11-27 | 1998-12-08 | Chemet Corporation | Electrically conductive material and method for making |
| WO2011125244A1 (en) | 2010-04-09 | 2011-10-13 | 三菱マテリアル株式会社 | Clay-like composition for forming a sintered object, powder for a clay-like composition for forming a sintered object, method for manufacturing a clay-like composition for forming a sintered object, sintered silver object, and method for manufacturing a sintered silver object |
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| DE1050551B (en) * | 1959-02-12 | Siemens Schuckertw erke Aktien gesellschaft Berlin und Erlangen | PuK ermetallic process for the manufacture of a contact material based on silver cadmium ox> d | |
| DE807416C (en) * | 1949-10-20 | 1951-06-28 | Eugen Duerrwaechter Dr Ing | Electrical contact material and process for its manufacture |
| CH588152A5 (en) * | 1972-12-11 | 1977-05-31 | Siemens Ag | |
| US3992199A (en) * | 1973-12-03 | 1976-11-16 | P. R. Mallory & Co., Inc. | Method of making electrical contact materials |
| JPS5222767A (en) * | 1975-08-13 | 1977-02-21 | Matsushita Electric Ind Co Ltd | Electric contact material |
| US4141727A (en) * | 1976-12-03 | 1979-02-27 | Matsushita Electric Industrial Co., Ltd. | Electrical contact material and method of making the same |
| IT7804826V0 (en) * | 1978-05-23 | 1978-05-23 | Terenzi Aleardo | BORE REDUCER |
| US4246321A (en) * | 1978-12-20 | 1981-01-20 | Chugai Denki Kogya Kabushiki-Kaisha | Ag-SnO Alloy composite electrical contact |
| US4294616A (en) * | 1979-01-02 | 1981-10-13 | Gte Products Corporation | Electrical contacts |
| US4361033A (en) * | 1979-01-02 | 1982-11-30 | Gte Laboratories Incorporated | Method for selecting an additive for electrical contacts |
| DE2933338C3 (en) * | 1979-08-17 | 1983-04-28 | Degussa Ag, 6000 Frankfurt | Material for electrical contacts and process for their manufacture |
| DE3017424C2 (en) * | 1980-05-07 | 1987-01-15 | Degussa Ag, 6000 Frankfurt | Material for electrical contacts |
| DE3102067A1 (en) * | 1981-01-23 | 1982-08-19 | Degussa Ag, 6000 Frankfurt | MATERIAL FOR ELECTRICAL CONTACTS |
| JPS5827904A (en) * | 1981-08-10 | 1983-02-18 | Matsushita Electric Works Ltd | Production of material for electric contact point |
| DE3146972A1 (en) * | 1981-11-26 | 1983-06-01 | Siemens AG, 1000 Berlin und 8000 München | METHOD FOR PRODUCING MOLDED PARTS FROM CADMIUM-FREE SILVER METAL OXIDE COMPOSITIONS FOR ELECTRICAL CONTACTS |
| JPS5896835A (en) * | 1981-12-02 | 1983-06-09 | Tanaka Kikinzoku Kogyo Kk | Electric contact material |
| JPS58117844A (en) * | 1981-12-29 | 1983-07-13 | Matsushita Electric Works Ltd | Electrical contact material |
| US4462841A (en) * | 1982-04-23 | 1984-07-31 | Mitsubishi Kinzoku Kabushiki Kaisha | Silver-metal oxide alloy electrical contact materials |
| JPS596342A (en) * | 1982-06-30 | 1984-01-13 | Matsushita Electric Works Ltd | Electric contact material |
-
1984
- 1984-12-18 DE DE8484115754T patent/DE3466122D1/en not_active Expired
- 1984-12-18 EP EP84115754A patent/EP0152606B1/en not_active Expired
-
1985
- 1985-01-23 US US06/693,717 patent/US4565590A/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110643847A (en) * | 2019-10-18 | 2020-01-03 | 宁波汉博贵金属合金有限公司 | Preparation method of silver tin oxide electric contact material |
| CN112760513A (en) * | 2020-12-30 | 2021-05-07 | 宁波东大神乐电工合金有限公司 | Silver tin oxide electrical contact material and preparation process thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0152606B1 (en) | 1987-09-09 |
| US4565590A (en) | 1986-01-21 |
| DE3466122D1 (en) | 1987-10-15 |
| EP0152606A3 (en) | 1985-09-25 |
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