US3226517A - Electrical contact device - Google Patents
Electrical contact device Download PDFInfo
- Publication number
- US3226517A US3226517A US225928A US22592862A US3226517A US 3226517 A US3226517 A US 3226517A US 225928 A US225928 A US 225928A US 22592862 A US22592862 A US 22592862A US 3226517 A US3226517 A US 3226517A
- Authority
- US
- United States
- Prior art keywords
- layer
- contact
- powder
- iron
- welding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/002—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of porous nature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/02—Contacts characterised by the material thereof
- H01H1/021—Composite material
- H01H1/023—Composite material having a noble metal as the basic material
- H01H1/0231—Composite material having a noble metal as the basic material provided with a solder layer
Definitions
- the electric contact body comprises a sintered contact layer of good electric contacting properties but relatively poor weldability as well as of a likewise sintered backing layer of good weldable metal, the two layers being both produced simultaneously by the powder-metallurgical method in substantially the ultimate shape of the body and are thus intimately sinter-bonded together.
- FIG. 1 is a flow diagram of a production method of the prior art
- FIG. 1a is a cross-section of an embodiment of a contact device produced by the method of FIG. 1;
- FIG. 2 is a flow diagram of an embodiment of the production method of the present invention.
- FIG. 2a is a cross section of an embodiment of a contact device of the present invention.
- FIG. 2b is a cross section of another embodiment of a contact device of the present invention.
- Known contact bodies for the above-mentioned purposes consist of two layers, namely a good contacting contact material proper and a backing layer of good weldable metal.
- the contact layer as shown at 1 in FIG. 1a may consist of silver, copper or alloys thereof, whereas the backing layer (2 in FIG. 1a) may consist of iron, nickel, Monel (Ni-Cu alloy in the ratio 75:25) or a similar good weldable metal.
- the powder-metallurgical methol namely, according to FIG. 1, from pulverulent material by pressing and thereafter sintering, followed by rolling the sintered body.
- the further porduction has been carried out by plating the contact material and the good weldable metal upon each other, for example by another hot-rolling or cladding process. Thereafter the contact bodies are produced from the resulting two-layer sheet material by punching, embossing or cut ting. This process is relatively expensive and the two layers may occasionally become separated from each other when the finished contacts are subjected to high electric and thermal loads.
- an intermediate layer as shown at 5 in FIG. 2b is lo cated between the contact layer 1 and the weldable backing layer 2 and is jointly bonded and shaped with the other layers by a powder-metallurgical sinter method so that the three layers form together a single integral structure.
- the intermediate layer to serve the just-mentioned purpose, must consist of a material that can be bonded with United States Patent 0 the respective materials of the two other layers by sintering.
- poorly weldable contact materials is herein understood to relate to materials whose weldability is appreciably below that of iron which is being considered here, together with nickel and Monel, as a measure of a good weldable metal.
- the production method according to the invention is diagrammatically represented in FIG. 2.
- the material for the contact layer (1 in FIGS. 2a and 2b) and the powder for the backing or welding layer 2 and, as the case may be, the powder for the intermediate sintering layer (5 in FIG. 2b) are separately prepared and are then successively filled into a mold or die to form two or three layers. These two or three layers are then jointly compressed to form a shaped body in accordance with the shape of the ultimate product to be obtained. Thereafter the press-molded body is subjected to sintering and then furnishes the finished contact structure. In some cases it is desirable, however, to subject the sintered product to subsequent pressing operation at a higher pressure than employed prior to sintering, for the purpose of giving the product its ultimate shape or density.
- FIGS. 1 and 2 A comparision of the two flow diagrams shown in FIGS. 1 and 2 will illustrate the considerable simplification obtained by virtue of the invention.
- the layers that constitute the shaped contact structure are much more intimately bonded together so that a subsequent separation between the sintered strata is virtually excluded regardless of the amount of electrical load or temperature to which the contact may be subjected during its electrical operation.
- a contact body designed and made according to the invention is preferably joined with its carrier, such as the structure 4 shown in FIG. 2a, by welding.
- its carrier such as the structure 4 shown in FIG. 2a
- the shape of the welding layer 2 can readily be adapted to the particular welding method to be employed for welding the contact body to its carrier without requiring any additional expedient or manufacturing step.
- such contacts are often connected with the carrier 4 by spot or boss welding which makes it necessary or desirable to provide the weldable backing layer 2 with a rearward boss 3 or protrusion, or several such bosses. According to the known contacts, this necessitated the above-mentioned embossing or operation or machining by cutting tools.
- the contact according to the invention can readily be provided with any desired bosses 3 simply by press-molding the pulverulent body accordingly.
- Welding bosses as shown at 3 are desirable, for example, in cases where the welding layer 2 consists of iron, nickel and Monel.
- the contact body can also be butt-welded upon the carrier 4 and the rear surface of the backing layer can then be given a planar shape.
- the shape of the welding layer 2 depending upon the particular welding method to be used, can simply be obtained by giving the pressing plunger the corresponding shape, thus requiring no additional fabricating step.
- the contact body according to the invention can be densified virtually up to its theoretical density by employing the above-mentioned pressing step subsequent to the sintering operation. This subsequent pressing and the resulting flow of material of the contact layer and the welding layer results in a finished body of particularly accurate shape and dimensions.
- Example 2 Used for the contact layer was Ag-C powder in the ratio 96/4. Used for the intermediate layer 5 was pure silver, and for the welding layer 2 iron. Filled into the press matrix mentioned under Example 1 were 0.4 g. carbonyl iron powder having a grain size below 5 micron, thereafter a layer of 0.2 g. electrolysis silver powder with a grain size below 60 micron, and thereafter 0.8 g. of a powder mixture composed of 96% electrolysis silver powder and 4% graphite powder having a grain size below micron (the percentages being by weight). The three layers were then compressed in a plunger press at a pressure of 1.5 t./cm. The resulting shaped bodies were sintered at 880 C. for one hour in vacuum (below 10- mm. Hg).
- the sintered body was subsequently subjected to compression at a pressure of 8 t./cm. resulting in a contact structure of finished shape, and attaining virtually the theoretical density in the contact layer 1 and in the welding layer 2.
- the contact body can readily be bosswelded on a carrier of iron.
- the press-molded body can be welded upon the carrier right after the sintering step, and the densification by subsequent pressing can be performed together with the carrier structure.
- the subsequent densification is performed at 3 t./cm. the contact layer and the intermediate layer will possess a residual porosity corresponding to a space-filling degree of 0.9 to 0.99.
- the contact metals Ag-Pb, Cu-Pb, Ag-CdO, Ag-SnO Ag-Ni-Cd can be provided with a corresponding welding layer.
- the contact metals contain tungsten, as is the case with such compositions as W-Cu, W-Ag, W-Cu-Ni, W-Ag-Ni and W-Cu-Ag-Ni
- the good welding layer 2 may consist of Ni-Cu alloy in the raio 75/25 (Monel). In these cases it is advisable to employ a molding pressure of 3 t./crn. and a sintering temperature of 1250 C. for one hour in hydrogen.
- the contact body When Ag-C is employed as contact layer 1 together with a welding layer consisting of Ag-Cu with a content of copper, for example 8% Cu, then the contact body need not be provided with bosses at the good weldable backing layer 2 but can be given a planar rear surface and be butt-welded upon a carrier structure 4 of brass or bronze.
- the Ag-Cu welding layer may also be given a higher copper content and is then particularly well suitable for butt welding at a lower electrical conductivity than
- An electrical contact device comprising a contact layer of material having a weldability less than that of iron;
- a welding layer of material having a weldability at least as good as that of iron said contact layer and said welding layer forming an integral powder-metallurgical unit of integrally shaped and solidified structure, said welding layer material comprising one of a group consisting of nickel-copper, nick-e1 powder, iron carbonyl, iron powder and silver copper.
- An electrical contact device comprising a contact layer of material having a weldability less than that of iron, said contact layer material comprising a powder mixture of silver and nickel in a ratio of to 10;
- An electrical contact device comprising a contact layer of material having a weldability less than that of iron, said contact layer material comprising a powder mixture of silver and graphite in a ratio of 96 to 4;
- An electrical contact device comprising a contact layer of material having a weldability less than that of iron, said contact layer material comprising one of a group consisting of silver-nickel, silver-graphite, silver-lead, silver-cadmium oxide, silver-stannic oxide, silver-nickel oxide, copper-lead, tungsten-copper, tungsten-silver, tungsten-coppernickel, tungsten-silver-nickel and tungsten-copper-silyer-nickel; and
- said contact layer and said welding layer forming an integral powder-metallurgical unit of integrally shaped and solidified structure, said welding layer material comprising one of a group consisting of nickel-copper, nickel powder, iron carbonyl, iron powder and silver copper.
Description
3,226,517 ELECTRICAL CONTACT DEVICE Horst Schreiuer, Numberg, Germany, assignor to Siemens-Schuckertwerke Aktiengesellschaft, Berlin- Siemensstadt, a corporation of Germany Filed Sept. 24, 1962, Ser. No. 225,928 Claims priority, application Germany, Sept. 26, 1961, S 75,926 6 Claims. (Cl. 200166) My invention relates to sintered contacts for electrical switches, relays and other contact apparatus.
It is an object of my invention to provide a sintered stratified contact structure which affords a considerable simplification and reduction in cost with respect to the manufacture of the contacts and also results in improved contact structures free from the danger of layer separation under high load conditions.
According to my invention, the electric contact body comprises a sintered contact layer of good electric contacting properties but relatively poor weldability as well as of a likewise sintered backing layer of good weldable metal, the two layers being both produced simultaneously by the powder-metallurgical method in substantially the ultimate shape of the body and are thus intimately sinter-bonded together.
In order that the present invention may be readily carried into effect, it will now be described with reference to the accompanying drawing, wherein:
FIG. 1 is a flow diagram of a production method of the prior art;
FIG. 1a is a cross-section of an embodiment of a contact device produced by the method of FIG. 1;
FIG. 2 is a flow diagram of an embodiment of the production method of the present invention;
FIG. 2a is a cross section of an embodiment of a contact device of the present invention; and
FIG. 2b is a cross section of another embodiment of a contact device of the present invention.
Known contact bodies for the above-mentioned purposes consist of two layers, namely a good contacting contact material proper and a backing layer of good weldable metal. For example, the contact layer as shown at 1 in FIG. 1a may consist of silver, copper or alloys thereof, whereas the backing layer (2 in FIG. 1a) may consist of iron, nickel, Monel (Ni-Cu alloy in the ratio 75:25) or a similar good weldable metal. It has become known to produce the contact layer 1 by the powder-metallurgical methol, namely, according to FIG. 1, from pulverulent material by pressing and thereafter sintering, followed by rolling the sintered body. The further porduction has been carried out by plating the contact material and the good weldable metal upon each other, for example by another hot-rolling or cladding process. Thereafter the contact bodies are produced from the resulting two-layer sheet material by punching, embossing or cut ting. This process is relatively expensive and the two layers may occasionally become separated from each other when the finished contacts are subjected to high electric and thermal loads. I
According to a feature of my invention, relating to the contact design in which the contact layer proper and the welding layer consist of respective materials that cannot be satisfactorily bonded together by the sintering method, an intermediate layer as shown at 5 in FIG. 2b is lo cated between the contact layer 1 and the weldable backing layer 2 and is jointly bonded and shaped with the other layers by a powder-metallurgical sinter method so that the three layers form together a single integral structure. The intermediate layer, to serve the just-mentioned purpose, must consist of a material that can be bonded with United States Patent 0 the respective materials of the two other layers by sintering.
The term poorly weldable contact materials is herein understood to relate to materials whose weldability is appreciably below that of iron which is being considered here, together with nickel and Monel, as a measure of a good weldable metal.
The production method according to the invention is diagrammatically represented in FIG. 2. The material for the contact layer (1 in FIGS. 2a and 2b) and the powder for the backing or welding layer 2 and, as the case may be, the powder for the intermediate sintering layer (5 in FIG. 2b) are separately prepared and are then successively filled into a mold or die to form two or three layers. These two or three layers are then jointly compressed to form a shaped body in accordance with the shape of the ultimate product to be obtained. Thereafter the press-molded body is subjected to sintering and then furnishes the finished contact structure. In some cases it is desirable, however, to subject the sintered product to subsequent pressing operation at a higher pressure than employed prior to sintering, for the purpose of giving the product its ultimate shape or density.
A comparision of the two flow diagrams shown in FIGS. 1 and 2 will illustrate the considerable simplification obtained by virtue of the invention. In addition, the layers that constitute the shaped contact structure are much more intimately bonded together so that a subsequent separation between the sintered strata is virtually excluded regardless of the amount of electrical load or temperature to which the contact may be subjected during its electrical operation.
A contact body designed and made according to the invention is preferably joined with its carrier, such as the structure 4 shown in FIG. 2a, by welding. It is another advantage of the invention over the prior art that the shape of the welding layer 2 can readily be adapted to the particular welding method to be employed for welding the contact body to its carrier without requiring any additional expedient or manufacturing step. For example, such contacts are often connected with the carrier 4 by spot or boss welding which makes it necessary or desirable to provide the weldable backing layer 2 with a rearward boss 3 or protrusion, or several such bosses. According to the known contacts, this necessitated the above-mentioned embossing or operation or machining by cutting tools. The contact according to the invention, however, can readily be provided with any desired bosses 3 simply by press-molding the pulverulent body accordingly. Welding bosses as shown at 3 are desirable, for example, in cases where the welding layer 2 consists of iron, nickel and Monel. In cases where the metal of the carrier structure 4 has a lower melting point than the backing layer 2, for example, when the carrier structure 4 consists of bronze or brass, the contact body can also be butt-welded upon the carrier 4 and the rear surface of the backing layer can then be given a planar shape. In any event, the shape of the welding layer 2, depending upon the particular welding method to be used, can simply be obtained by giving the pressing plunger the corresponding shape, thus requiring no additional fabricating step.
In cases where it is essential that the contact material in layer 1 have a highest feasible density, the contact body according to the invention can be densified virtually up to its theoretical density by employing the above-mentioned pressing step subsequent to the sintering operation. This subsequent pressing and the resulting flow of material of the contact layer and the welding layer results in a finished body of particularly accurate shape and dimensions.
The invention is further illustrated by the following embodiments and production methods:
3 Examp e 1 Employed for the contact layer 1 was an Ag-Ni powder mixture in the ratio 90/ 10. Nickel powder was used for the welding layer. Filled into a matrix having a pressing area of 10 mm. diameter were 0.35 g. carbonyl nickel powder with a grain size below 10 micron, and thereafter 1.5 g. of the Ag-Ni powder mixture. The powder was then compressed at a pressure of 1 ton/cm The resultinng shaped body was subsequently sintered at 850 C. for one hour in a hydrogen atmosphere. The sintered body was subsequently pressed at 8 ton/cm}. During sintering, the nickel layer shrinks somewhat more than the Ag Ni layer. The subsequent pressing results in a contact body of finished shape. Machined into the lower plunger of the press is the shape of a boss 3 having a diameter of 4 mm. and the height of 0.5 mm., resulting in a product corresponding to that shown in FIG. 2a. The contact structure can readily be boss-welded upon a contact carrier 4 of iron.
Example 2 Used for the contact layer was Ag-C powder in the ratio 96/4. Used for the intermediate layer 5 was pure silver, and for the welding layer 2 iron. Filled into the press matrix mentioned under Example 1 were 0.4 g. carbonyl iron powder having a grain size below 5 micron, thereafter a layer of 0.2 g. electrolysis silver powder with a grain size below 60 micron, and thereafter 0.8 g. of a powder mixture composed of 96% electrolysis silver powder and 4% graphite powder having a grain size below micron (the percentages being by weight). The three layers were then compressed in a plunger press at a pressure of 1.5 t./cm. The resulting shaped bodies were sintered at 880 C. for one hour in vacuum (below 10- mm. Hg). The sintered body was subsequently subjected to compression at a pressure of 8 t./cm. resulting in a contact structure of finished shape, and attaining virtually the theoretical density in the contact layer 1 and in the welding layer 2. The contact body can readily be bosswelded on a carrier of iron. The press-molded body can be welded upon the carrier right after the sintering step, and the densification by subsequent pressing can be performed together with the carrier structure. When, in the above-described example, the subsequent densification is performed at 3 t./cm. the contact layer and the intermediate layer will possess a residual porosity corresponding to a space-filling degree of 0.9 to 0.99.
In the methods otherwise corresponding substantially to the above-described examples, other contact metals can also be used. Thus, the contact metals Ag-Pb, Cu-Pb, Ag-CdO, Ag-SnO Ag-Ni-Cd can be provided with a corresponding welding layer. When the contact metals contain tungsten, as is the case with such compositions as W-Cu, W-Ag, W-Cu-Ni, W-Ag-Ni and W-Cu-Ag-Ni, the good welding layer 2 may consist of Ni-Cu alloy in the raio 75/25 (Monel). In these cases it is advisable to employ a molding pressure of 3 t./crn. and a sintering temperature of 1250 C. for one hour in hydrogen.
When Ag-C is employed as contact layer 1 together with a welding layer consisting of Ag-Cu with a content of copper, for example 8% Cu, then the contact body need not be provided with bosses at the good weldable backing layer 2 but can be given a planar rear surface and be butt-welded upon a carrier structure 4 of brass or bronze. The Ag-Cu welding layer may also be given a higher copper content and is then particularly well suitable for butt welding at a lower electrical conductivity than To those skilled in the art it will be understood, upon studying this disclosure, that with respect to details in design and shape as well as relative to individual materials and correspondingly adapted temperatures and pressures, my invention permits of various modifications and can be given embodiments other than particularly illustrated and described herein, without departing from the essential features of the invention and Within the scope of the claims annexed hereto.
I claim? 1. An electrical contact device, comprising a contact layer of material having a weldability less than that of iron; and
a welding layer of material having a weldability at least as good as that of iron, said contact layer and said welding layer forming an integral powder-metallurgical unit of integrally shaped and solidified structure, said welding layer material comprising one of a group consisting of nickel-copper, nick-e1 powder, iron carbonyl, iron powder and silver copper.
2. An electrical contact device as claimed in claim 1, further comprising an intermediate layer of material positioned between and integrally formed with said contact layer and said welding layer.
3. An electrical contact device as claimed in claim 1, further comprising an intermediate layer of pure silver positioned between and integrally formed with said contact layer and said welding layer.
4. An electrical contact device, comprising a contact layer of material having a weldability less than that of iron, said contact layer material comprising a powder mixture of silver and nickel in a ratio of to 10; and
a welding layer of material having a weldability at least as good as that of iron, said contact layer and said welding layer forming an integral powder-metallurgical unit of integrally shaped and solidified structure.
5. An electrical contact device, comprising a contact layer of material having a weldability less than that of iron, said contact layer material comprising a powder mixture of silver and graphite in a ratio of 96 to 4; and
a welding layer of material having a weldability at least as good as that of iron, said contact layer and said welding layer forming an integral powder-metallurgical unit of integrally shaped and solidified structure.
6. An electrical contact device, comprising a contact layer of material having a weldability less than that of iron, said contact layer material comprising one of a group consisting of silver-nickel, silver-graphite, silver-lead, silver-cadmium oxide, silver-stannic oxide, silver-nickel oxide, copper-lead, tungsten-copper, tungsten-silver, tungsten-coppernickel, tungsten-silver-nickel and tungsten-copper-silyer-nickel; and
a welding layer of material having a weldability at least as good as that of iron, said contact layer and said welding layer forming an integral powder-metallurgical unit of integrally shaped and solidified structure, said welding layer material comprising one of a group consisting of nickel-copper, nickel powder, iron carbonyl, iron powder and silver copper.
References Cited by the Examiner UNITED STATES PATENTS 2,414,463 l/1947 Gunn et al 200--166 2,464,591 3/1949 Larsen et a1 29-l55.55 2,706,759 4/1955 Williamson 200-l66 2,925,647 2/1960 Ioneset al. 29l55.55 3,034,202 5/1962 Graves 29--l55.55 3,106,628 10/1963 Chiswcll 200-166 FOREIGN PATENTS 749,390 5/1956 Great Britain.
KATHLEEN H. CLAFFY, Primary Examiner.
BERNARD A. GILHEANY, Examiner.
Claims (1)
1. AN ELECTRICAL CONTACT DEVICE, COMPRISING A CONTACT LAYER OF MATERIAL HAVING A WEIDABILITY LESS THAN THAT OF IRON; AND A WELDING LAYER OF MATERIAL HAVING A WELDABILITY AT LEAST AS GOOD AS THAT OF IRON, SAID CONTACT LAYER AND SAID WELDING LAYER FORMING AN INTEGRAL POWDER-METALLURGICAL UNIT OF INTEGRALLY SHAPED AND SOLIDIFIED STRUCTURE, SAID WELDING LAYER MATERIAL COMPRISING ONE OF A GROUP CONSISTING OF NICKEL-COPPER, NICKEL POWDER, IRON CARBONYL, IRON POWDER AND SILVER COPPER.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES75926A DE1209223B (en) | 1961-09-26 | 1961-09-26 | Sintered contact bodies with two or more layers |
Publications (1)
Publication Number | Publication Date |
---|---|
US3226517A true US3226517A (en) | 1965-12-28 |
Family
ID=7505733
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US225928A Expired - Lifetime US3226517A (en) | 1961-09-26 | 1962-09-24 | Electrical contact device |
Country Status (4)
Country | Link |
---|---|
US (1) | US3226517A (en) |
DE (1) | DE1209223B (en) |
FR (1) | FR1335263A (en) |
GB (1) | GB1021911A (en) |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3332138A (en) * | 1965-08-11 | 1967-07-25 | Gen Cable Corp | Method and apparatus for making precision sized tubing |
US3346951A (en) * | 1966-02-24 | 1967-10-17 | Talon Inc | Method of making electrical contact elements |
US3402276A (en) * | 1967-06-15 | 1968-09-17 | Ass Elect Ind | Hermetically sealed switches |
US3742170A (en) * | 1971-09-30 | 1973-06-26 | Westinghouse Electric Corp | Loud tap changer by-pass switch contact assembly and material composition thereof |
US3828428A (en) * | 1972-09-25 | 1974-08-13 | Westinghouse Electric Corp | Matrix-type electrodes having braze-penetration barrier |
US3859491A (en) * | 1973-08-31 | 1975-01-07 | Gen Electric | Contact assembly and method of manufacture of having silver-cadmium oxide contacts affixed to a brass carrier |
US3863337A (en) * | 1971-09-01 | 1975-02-04 | Siemens Ag | Powder metallurgy method for making an electric contact and the resulting contact |
US3864827A (en) * | 1971-09-01 | 1975-02-11 | Siemens Ag | Method for making an electric contact by powder metallurgy and the resulting contact |
US4008520A (en) * | 1970-02-07 | 1977-02-22 | Siemens Aktiengesellschaft | Contact member and method of manufacture |
DE2718975A1 (en) * | 1977-04-28 | 1978-11-09 | Siemens Ag | METHOD FOR PRODUCING A BRIDGE |
WO1985001148A1 (en) * | 1983-09-02 | 1985-03-14 | Hitachi, Ltd. | Electrode of vacuum breaker |
US5679471A (en) * | 1995-10-16 | 1997-10-21 | General Motors Corporation | Silver-nickel nano-composite coating for terminals of separable electrical connectors |
US5967860A (en) * | 1997-05-23 | 1999-10-19 | General Motors Corporation | Electroplated Ag-Ni-C electrical contacts |
WO2010051922A3 (en) * | 2008-11-06 | 2010-07-01 | Ami Doduco Gmbh | Method for producing a semi-finished part and semi-finished part for electrical contacts and contact piece |
EP3116009A1 (en) * | 2015-07-07 | 2017-01-11 | Siemens Aktiengesellschaft | Electric switch contact |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2761858C1 (en) * | 2021-02-25 | 2021-12-13 | Общество с ограниченной ответственностью «Электротехнический Завод «Эльком» (RU) | Material for electrical contacts based on silver |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2414463A (en) * | 1943-09-10 | 1947-01-21 | Metals & Controls Corp | Electrical contact |
US2464591A (en) * | 1944-04-04 | 1949-03-15 | Mallory & Co Inc P R | Method of bonding a tungsten member to a backing member |
US2706759A (en) * | 1951-07-14 | 1955-04-19 | Gibson Electric Company | Refractory contacts |
GB749390A (en) * | 1953-08-27 | 1956-05-23 | Mallory Metallurg Prod Ltd | Improvements in and relating to the manufacture of electrical contacts |
US2925647A (en) * | 1958-01-28 | 1960-02-23 | Engelhard Ind Inc | Method of making electrical contacts |
US3034202A (en) * | 1957-01-23 | 1962-05-15 | Gibson Electric Company | Contact for forge welding methods |
US3106628A (en) * | 1957-08-27 | 1963-10-08 | Fansteel Metallurgical Corp | Cylindrical forged tungsten electrical contact |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE860525C (en) * | 1943-04-14 | 1952-12-22 | Eugen Dr-Ing Duerrwaechter | Bimetal contact |
DE1055147B (en) * | 1957-11-05 | 1959-04-16 | Degussa | Process for the production of solderable molded bodies from silver-cadmium-oxide for contact purposes |
-
1961
- 1961-09-26 DE DES75926A patent/DE1209223B/en active Pending
-
1962
- 1962-08-22 FR FR907549A patent/FR1335263A/en not_active Expired
- 1962-09-24 US US225928A patent/US3226517A/en not_active Expired - Lifetime
- 1962-09-26 GB GB36625/62A patent/GB1021911A/en not_active Expired
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2414463A (en) * | 1943-09-10 | 1947-01-21 | Metals & Controls Corp | Electrical contact |
US2464591A (en) * | 1944-04-04 | 1949-03-15 | Mallory & Co Inc P R | Method of bonding a tungsten member to a backing member |
US2706759A (en) * | 1951-07-14 | 1955-04-19 | Gibson Electric Company | Refractory contacts |
GB749390A (en) * | 1953-08-27 | 1956-05-23 | Mallory Metallurg Prod Ltd | Improvements in and relating to the manufacture of electrical contacts |
US3034202A (en) * | 1957-01-23 | 1962-05-15 | Gibson Electric Company | Contact for forge welding methods |
US3106628A (en) * | 1957-08-27 | 1963-10-08 | Fansteel Metallurgical Corp | Cylindrical forged tungsten electrical contact |
US2925647A (en) * | 1958-01-28 | 1960-02-23 | Engelhard Ind Inc | Method of making electrical contacts |
Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3332138A (en) * | 1965-08-11 | 1967-07-25 | Gen Cable Corp | Method and apparatus for making precision sized tubing |
US3346951A (en) * | 1966-02-24 | 1967-10-17 | Talon Inc | Method of making electrical contact elements |
US3402276A (en) * | 1967-06-15 | 1968-09-17 | Ass Elect Ind | Hermetically sealed switches |
US4008520A (en) * | 1970-02-07 | 1977-02-22 | Siemens Aktiengesellschaft | Contact member and method of manufacture |
US3863337A (en) * | 1971-09-01 | 1975-02-04 | Siemens Ag | Powder metallurgy method for making an electric contact and the resulting contact |
US3864827A (en) * | 1971-09-01 | 1975-02-11 | Siemens Ag | Method for making an electric contact by powder metallurgy and the resulting contact |
US3742170A (en) * | 1971-09-30 | 1973-06-26 | Westinghouse Electric Corp | Loud tap changer by-pass switch contact assembly and material composition thereof |
US3828428A (en) * | 1972-09-25 | 1974-08-13 | Westinghouse Electric Corp | Matrix-type electrodes having braze-penetration barrier |
US3859491A (en) * | 1973-08-31 | 1975-01-07 | Gen Electric | Contact assembly and method of manufacture of having silver-cadmium oxide contacts affixed to a brass carrier |
US4222167A (en) * | 1977-04-28 | 1980-09-16 | Siemens Aktiengesellschaft | Method of manufacturing a contact bridge |
DE2718975A1 (en) * | 1977-04-28 | 1978-11-09 | Siemens Ag | METHOD FOR PRODUCING A BRIDGE |
US4892986A (en) * | 1983-02-09 | 1990-01-09 | Hitachi, Ltd. | Vacuum circuit breaker |
WO1985001148A1 (en) * | 1983-09-02 | 1985-03-14 | Hitachi, Ltd. | Electrode of vacuum breaker |
US5679471A (en) * | 1995-10-16 | 1997-10-21 | General Motors Corporation | Silver-nickel nano-composite coating for terminals of separable electrical connectors |
US5967860A (en) * | 1997-05-23 | 1999-10-19 | General Motors Corporation | Electroplated Ag-Ni-C electrical contacts |
WO2010051922A3 (en) * | 2008-11-06 | 2010-07-01 | Ami Doduco Gmbh | Method for producing a semi-finished part and semi-finished part for electrical contacts and contact piece |
US8992826B2 (en) | 2008-11-06 | 2015-03-31 | Doduco Gmbh | Method for producing a semifinished product and semifinished product for electrical contacts and contact piece |
CN102395389B (en) * | 2008-11-06 | 2015-12-16 | 多杜科有限公司 | Electrical contact and electric contact point semi-finished product and manufacture method thereof |
EP3116009A1 (en) * | 2015-07-07 | 2017-01-11 | Siemens Aktiengesellschaft | Electric switch contact |
WO2017005401A1 (en) * | 2015-07-07 | 2017-01-12 | Siemens Aktiengesellschaft | Electrical switching contact |
CN107851529A (en) * | 2015-07-07 | 2018-03-27 | 西门子公司 | Electrical switching contact |
US20180197695A1 (en) * | 2015-07-07 | 2018-07-12 | Siemens Aktiengesellschaft | Electrical switching contact |
Also Published As
Publication number | Publication date |
---|---|
GB1021911A (en) | 1966-03-09 |
FR1335263A (en) | 1963-08-16 |
DE1209223B (en) | 1966-01-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3226517A (en) | Electrical contact device | |
US3954459A (en) | Method for making sintered silver-metal oxide electric contact material | |
KR0144562B1 (en) | Process for producing a cu-cr contact material for vacuum switches and appropriate contact material | |
US3360348A (en) | Composite structure of inter-bonded metals for heavy-duty electrical switch contacts | |
US8992826B2 (en) | Method for producing a semifinished product and semifinished product for electrical contacts and contact piece | |
EP2838096B1 (en) | Electrical contact system | |
US3385677A (en) | Sintered composition material | |
US3373003A (en) | Multi-layer bonded metal structure | |
US3560170A (en) | Rod-shaped multilayer semifinished material and a process and an apparatus for manufacturing such material | |
US3864827A (en) | Method for making an electric contact by powder metallurgy and the resulting contact | |
JP2012507833A (en) | Method for manufacturing semi-finished product for electrical contact, semi-finished product for electrical contact, and electrical contact member | |
JP2012507623A5 (en) | ||
CN101562081B (en) | Preparation method of silver-saving laminating composite contact terminal piece | |
CA1339713C (en) | Semi-finished produit for making electric contacts, made of a composite material based on silver and tinoxide and power-metallurgical process ofprooducing the semi-finished produit | |
JP2014531700A (en) | Method for producing semi-finished products for electrical contacts and contact pieces | |
US4681702A (en) | Sintered, electrical contact material for low voltage power switching | |
US2706759A (en) | Refractory contacts | |
US6524525B2 (en) | Method for producing a contact material for contact pieces for vacuum switch devices, and a contact material and contact pieces therefor | |
US10629397B2 (en) | Contact member, method for producing the same, and vacuum interrupter | |
US3863337A (en) | Powder metallurgy method for making an electric contact and the resulting contact | |
US3199176A (en) | Method of manufacturing electrical contacts | |
JPH11269579A (en) | Silver-tungsten/wc base sintered type electric contact material and its production | |
US2733319A (en) | Material for electric contacts | |
US1552184A (en) | Metal composition and method of manufacture | |
US4450204A (en) | Silver material suitable for backing of silver-cadmium oxide contacts and contacts employing same |