CN111468718B - Silver copper oxide sheet-shaped electric contact and preparation method thereof - Google Patents
Silver copper oxide sheet-shaped electric contact and preparation method thereof Download PDFInfo
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- CN111468718B CN111468718B CN202010153794.0A CN202010153794A CN111468718B CN 111468718 B CN111468718 B CN 111468718B CN 202010153794 A CN202010153794 A CN 202010153794A CN 111468718 B CN111468718 B CN 111468718B
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- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
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- 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
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- C22C5/06—Alloys based on silver
- C22C5/08—Alloys based on silver with copper as the next major constituent
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- 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
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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
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- H—ELECTRICITY
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- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
- H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
- H01H11/048—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts by powder-metallurgical processes
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/20—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by extruding
- B22F2003/208—Warm or hot extruding
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
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- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Abstract
The invention discloses a silver copper oxide sheet-shaped electrical contact and a preparation method thereof, which comprises the steps of firstly preparing a silver copper oxide powder spindle, sintering and repressing the silver copper oxide powder spindle, obtaining the silver copper oxide spindle with a silver copper alloy layer coated on the surface by adopting a hydrogen reduction mode, extruding the silver copper oxide spindle into a silver copper oxide strip with the silver copper alloy layer coated on three sides by adopting a backward extrusion device after repressing treatment, finally processing the silver copper oxide strip into the sheet-shaped electrical contact with a silver copper oxide working layer and a silver copper alloy layer welding layer by rolling, punching and surface treatment, and taking the silver copper alloy layer as a welding flux without placing extra welding flux in the welding process. Compared with the traditional silver copper oxide sheet-shaped electric contact with a pure silver layer as a welding surface, the welding efficiency and the welding quality can be improved; compared with the traditional rolling silver coating process and the traditional back extrusion silver coating process, the reliability of the bonding strength between the working layer and the welding layer is higher.
Description
Technical Field
The invention belongs to the field of electrical contact materials, and particularly relates to a silver copper oxide sheet-shaped electrical contact and a preparation method thereof.
Background
In the industry of low-voltage electrical appliances, the most widely applied electrical contact material at present is a silver-based electrical contact material, and the silver metal oxide electrical contact material has the comprehensive advantages of excellent arc erosion resistance, excellent welding resistance, low and stable contact resistance and the like, so that the silver-based electrical contact material plays an important role in the whole electrical contact material system. In recent years, an important content of research and development of silver metal oxide electric contact materials is to develop a new material capable of replacing the traditional contact material silver cadmium oxide, and through years of research and development, silver tin oxide, silver zinc oxide, silver copper oxide and other series of silver metal oxide electric contact materials are successfully developed. The research in China shows that the silver copper oxide electric contact material has excellent material transfer resistance when being applied to the direct current condition, and the material is applied to the field of direct current contactors in batches at present. When the silver copper oxide material is applied to the field of contactors with larger current grades, the silver copper oxide material is generally processed into a sheet contact form and assembled after being welded with a copper contact bridge. When the silver copper oxide sheet-shaped electric contact is welded with the copper contact bridge, besides a welding silver layer, solder or soldering paste needs to be additionally added, the welding process is complex, and the consistency of welding strength and welding area is poor.
Because the wettability between the silver metal oxide electric contact material and the solder and the copper contact bridge is poor, a pure silver layer needs to be compounded on a welding surface to be used as a welding silver layer in the contact processing process, so that the welding strength and the welding area between the contact and the contact bridge are improved. The adopted composite process is generally an extrusion silver-coating process or a hot rolling silver-coating process, which is described in detail in patents ZL03134913.7, ZL200710068786.0, ZL201310653584.4, ZL201410604339.2, ZL201910786745.8 and the like. The method has two inevitable defects, on one hand, when the silver metal oxide sheet-shaped electric contact is welded with the copper contact bridge, besides a welding silver layer, solder or soldering paste needs to be additionally added, the welding process is complex, and the consistency of the welding strength and the welding area is poor; the other one is that the extrusion silver coating process and the hot rolling silver coating process are both two layers of different materials compounded in a solid phase diffusion mode, the compounding strength is influenced by compounding parameters, deformation, the cleanness degree of a compounding interface of the two different materials (silver metal oxide and pure silver) and the like, the process control requirement on the preparation process is high, and once defects occur, the defects are not easy to find, the risk that a contact working layer falls off from the compounding interface can occur in the electrical contact process.
Therefore, how to improve the welding performance of the silver copper oxide sheet-shaped electrical contact material and the reliability of the composite strength between the welding layer and the working layer of the silver copper oxide sheet-shaped electrical contact material has important practical application value for improving the consistency and the stability of the electrical performance of the silver copper oxide sheet-shaped electrical contact material.
Disclosure of Invention
In order to solve the problems and the defects in the prior art, the invention aims to provide the silver copper oxide sheet-shaped electric contact and the preparation method thereof.
In order to achieve the purpose, the technical scheme of the invention is a preparation method of a silver copper oxide sheet-shaped electric contact, which comprises the following steps:
(1) pressing the silver copper oxide powder into a silver copper oxide spindle by using a cold isostatic pressing device, and then sintering in an air atmosphere at the sintering temperature of 800-900 ℃ for 4-8 h;
(2) carrying out re-pressing treatment on the silver copper oxide spindle treated in the step (1) to obtain a silver copper oxide spindle with higher densification degree, and carrying out re-pressing and pressure maintaining for 10-30 s;
(3) reducing the silver copper oxide spindle treated in the step (2) in a hydrogen atmosphere to obtain a silver copper oxide composite spindle with a silver copper alloy layer wrapped on the surface, wherein the reduction temperature is 400-700 ℃, the reduction time is 1-4 h, and the thickness of the silver copper alloy layer is 3-5% of the diameter of the silver copper oxide composite spindle;
(4) carrying out re-pressing treatment on the silver copper oxide composite spindle treated in the step (3), removing air holes in a silver copper alloy layer on the surface of the silver copper oxide composite spindle, and enabling the silver copper alloy layer to be densified, wherein the re-pressing and pressure maintaining time is 10-30 s;
(5) heating the silver copper oxide composite spindle at 700-800 ℃ for 2-4 h under the protection of inert gas, and then extruding two silver copper oxide/silver copper composite strips by adopting backward extrusion equipment;
(6) the silver copper oxide/silver copper composite strip is rolled, punched and subjected to surface treatment to prepare the flaky contact with the working layer of silver copper oxide and the welding layer of silver copper alloy
The silver copper oxide flake-shaped electric contact further comprises the following components in percentage by mass: copper oxide is more than or equal to 10 percent and less than or equal to 15 percent, additive is more than or equal to 0 percent and less than or equal to 2 percent, and the balance is silver. Wherein the additive is NiO and SnO2、Bi2O3、ZnO、WO3One or more of them.
The silver copper oxide/silver copper strip obtained by backward extrusion is further arranged, and the thickness of the silver copper alloy layer is 10% -20% of the total thickness of the silver copper oxide/silver copper strip.
In addition, the invention also provides the silver copper oxide flaky electric contact prepared by the preparation method.
The innovative principle of the invention is as follows:
the invention adopts the scheme that the reduced silver-copper alloy is used as a welding layer, the content range of the copper oxide of the silver-copper oxide flaky electric contact is more than or equal to 10% and less than or equal to 15%, the content range of the copper after reduction treatment is more than or equal to 8% and less than or equal to 12%, the melting point of the silver-copper alloy within the range of AgCu 8-AgCu 12 is about 860-900 ℃ according to a silver-copper binary alloy phase diagram, and based on the data, the reduction temperature of the silver-copper oxide spindle and the heating temperature of the spindle after reduction treatment before extrusion are selected to be less than 850 ℃. The thickness of the silver-copper alloy layer is indirectly controlled by controlling the reduction temperature and the reduction time, and the structure of the silver-copper oxide spindle subjected to reduction treatment is shown in the attached figure 1 in the specification. The back extrusion process of the silver copper oxide spindle after reduction processing adopts a cutting die to extrude the silver copper oxide spindle into two strips, the cross section of each strip is of a structure with three surfaces coated with silver copper alloy layers, and specifically, as shown in the attached figure 2 of the specification, due to the fact that the wettability between dispersion strengthening phase copper oxide in the silver copper oxide material and a silver matrix is poor, the plasticity of the material is poor, the problem of edge cracking of the strips in the rolling process can be effectively solved by adopting the structure with the three surfaces coated with the silver copper alloy layers, the utilization rate of the material is improved, edges with reasonable width are reserved on two sides of the strips in the punching process, and the silver copper alloy layers coated on two sides of the strips are prevented from being brought into finished products. The silver copper oxide sheet-shaped electric contact with the silver copper oxide/silver copper double-layer structure is prepared, in the welding process of the silver copper oxide/silver copper double-layer structure and a copper contact bridge, solder or soldering paste does not need to be additionally placed, the welding temperature is controlled to be 880-920 ℃, the melting point of the silver copper alloy layer is higher than the melting point of the silver copper alloy layer but lower than the melting point of silver, part of the silver copper alloy layer is directly melted, and firm metallurgical bonding is formed between the contact and the contact bridge.
Compared with the known preparation process, the preparation method has the following advantages and positive effects:
1. the reliability of the bonding strength between the silver copper oxide sheet-shaped electric contact working layer and the welding layer is improved. In the conventional contact production process, two layers of materials are compounded between a working layer and a welding layer by a rolling compounding process or an extrusion compounding process after being processed, in the processing process of a semi-finished product, foreign matters which influence the bonding strength, such as oil, impurities and the like are easily adhered to a compound interface, the foreign matters need to be removed by annealing, cleaning and the like, and the problem cannot be fundamentally avoided.
2. Solder or soldering paste does not need to be additionally placed, and the welding efficiency and the welding quality are improved. The traditional silver-copper oxide sheet-shaped electric contact taking a pure silver layer as a silver welding silver layer needs to be additionally provided with solder or soldering paste in the welding process, the welding efficiency is low, and more factors influencing the welding strength exist. The invention adopts the silver-copper alloy layer to replace the mode of welding the silver layer, the silver-copper alloy layer has a melting point lower than that of silver, the silver-copper alloy and the copper contact bridge can form stable multi-element alloy in the welding process, and meanwhile, the welding layer with the thickness of the contact part is directly melted, so the influence of the contact flatness on the welding quality is eliminated.
3. The material has excellent processing performance and high utilization rate. Compared with the conventional rolling silver-coated production process, the silver-copper oxide strip prepared by the invention has the advantages that the side surface and the bottom surface are wrapped by the silver-copper alloy layer, the plasticity of the silver-copper alloy layer is superior to that of the silver-copper oxide layer, edge cracks cannot be generated in the rolling process, and the material utilization rate is improved. Compared with the traditional sheath backward extrusion silver coating production process, the silver copper oxide layer and the silver copper layer of the backward extrusion spindle prepared by the invention are of an integral structure, and the phenomena of silver sheath breakage, silver sheath dislocation and the like can not be generated in the extrusion process; because the friction force between the silver sleeve and the inner liner of the extrusion cylinder and the friction force between the silver sleeve and the silver copper oxide spindle are different, the phenomena of silver sleeve breakage and silver sleeve dislocation are easy to occur, so that the defects that the silver layer is mixed with copper oxide or the silver copper oxide layer is mixed with pure silver and the like occur in the extruded sheet, and the material utilization rate is influenced.
4. The invention has simple designed process route and short processing flow and is suitable for mass production. Compared with the conventional rolling silver-coating production process, the processes of rolling, annealing, cleaning, hot rolling, compounding and the like of the silver plate for coating silver are cancelled, and the spindle reduction process is added; compared with the conventional back extrusion silver coating, the process of preparing the silver tube, turning the spindle, treating the surfaces of the silver tube and the spindle and the like is cancelled, and the spindle reduction process is also added. Has obvious advantages in the aspects of processing flow and process control difficulty.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
FIG. 1 is a schematic view of a silver copper oxide spindle according to the present invention after reduction treatment;
FIG. 2 is a schematic cross-sectional view of a strip of the present invention after counter-extrusion of a silver copper oxide reduction ingot;
FIG. 3 is a phase diagram of a silver-copper binary alloy;
FIG. 4 is a process flow diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
The first embodiment is as follows:
a) melting 27.6kg of silver and 2.4kg of copper in a graphite crucible of a medium-frequency smelting furnace to form silver-copper alloy melt, and preparing silver-copper alloy powder by adopting high-pressure water atomization equipment;
b) drying, sieving and oxidizing the silver-copper alloy powder to prepare silver copper oxide powder;
c) pressing the silver copper oxide powder into a silver copper oxide spindle by adopting cold isostatic pressing equipment, wherein the ingot pressing pressure is 200MPa, the pressure maintaining time is 30s, and the diameter of the obtained spindle is 105 mm;
d) sintering the silver copper oxide spindle in an air atmosphere at the sintering temperature of 800 ℃ for 8 h;
e) carrying out repressing treatment on the silver copper oxide spindle by adopting a 500T four-column hydraulic press for 30s of pressure maintaining time;
f) reducing the silver copper oxide spindle in a hydrogen atmosphere at the reduction temperature of 400 ℃ for 4h, and reducing the surface layer of the silver copper oxide spindle into a silver copper alloy layer, wherein the thickness of the silver copper alloy layer is controlled to be 3-5% of the diameter of the silver copper oxide spindle;
g) carrying out repressing treatment on the silver-copper oxide composite spindle by adopting a 500T four-column hydraulic press, removing air holes in a silver-copper alloy layer on the surface of the spindle, and compacting the silver-copper alloy layer for 30 s;
h) heating the silver copper oxide composite spindle at 700 ℃ for 4h under the protection of argon, extruding the silver copper oxide composite spindle into two silver copper oxide composite strips by adopting backward extrusion equipment, and coating silver copper alloy layers on the bottom surface and two side surfaces of the extruded silver copper oxide strips, wherein the thickness of the silver copper alloy layers is 10-20% of the total thickness of the extruded strips;
i) the silver copper oxide/silver copper strip is rolled, punched and subjected to surface treatment to prepare the flaky electrical contact with the working layer of silver copper oxide (10) and the welding layer of silver copper (8).
Example two:
a) melting 21.75kg of silver, 3kg of copper and 0.25kg of additives in a graphite crucible of a medium-frequency smelting furnace to form silver-copper alloy melt, and preparing silver-copper alloy powder by adopting high-pressure water atomization equipment, wherein the additives are NiO and SnO2、Bi2O3、ZnO、WO3One or more of the above;
b) drying, sieving and oxidizing the silver-copper alloy powder to prepare silver copper oxide powder;
c) pressing the silver copper oxide powder into a silver copper oxide spindle by adopting cold isostatic pressing equipment, wherein the ingot pressing pressure is 200MPa, the pressure maintaining time is 60s, and the diameter of the obtained spindle is 105 mm;
d) sintering the silver copper oxide spindle in an air atmosphere at the sintering temperature of 900 ℃ for 4 h;
e) carrying out repressing treatment on the silver copper oxide spindle by adopting a 500T four-column hydraulic press for 20s of pressure maintaining time;
f) reducing the silver copper oxide spindle in a hydrogen atmosphere at the reduction temperature of 700 ℃ for 1h, and reducing the surface layer of the silver copper oxide spindle into a silver copper alloy layer, wherein the thickness of the silver copper alloy layer is controlled to be 3-5% of the diameter of the silver copper oxide spindle;
g) carrying out repressing treatment on the silver-copper oxide composite spindle by adopting a 500T four-column hydraulic press, removing air holes in a silver-copper alloy layer on the surface of the spindle, and compacting the silver-copper alloy layer for 20 s;
h) heating the silver copper oxide composite spindle at 800 ℃ for 2h under the protection of argon, extruding the silver copper oxide composite spindle into two silver copper oxide composite strips by adopting backward extrusion equipment, and coating silver copper alloy layers on the bottom surface and two side surfaces of the extruded silver copper oxide strips, wherein the thickness of the silver copper alloy layers is 10-20% of the total thickness of the extruded strips;
i) the silver copper oxide/silver copper strip is rolled, punched and subjected to surface treatment to prepare the flaky electrical contact with the working layer being silver copper oxide (15) and the welding layer being silver copper (12).
Example three:
a) mixing 21.75kg silver powder, 3.125kg copper oxide powder, and 0.125kg additive powder in a plough shovel type powder mixer for 4h, wherein the silver powder is-200 mesh, the average particle size of the copper oxide powder is 1.5 μm, the average particle size of the additive powder is 1 μm, and the additive is NiO or SnO2、Bi2O3、ZnO、WO3One or more of the above;
b) pressing the uniformly mixed silver copper oxide powder into a silver copper oxide spindle by adopting a cold isostatic pressing device, wherein the ingot pressing pressure is 250MPa, the pressure maintaining time is 40s, and the diameter of the obtained spindle is 105 mm;
c) sintering the silver copper oxide spindle in an air atmosphere at the sintering temperature of 850 ℃ for 6 h;
d) the silver copper oxide spindle is subjected to repressing treatment by adopting a 500T four-column hydraulic press, and the pressure maintaining time is 10S;
e) reducing the silver copper oxide spindle in a hydrogen atmosphere at the reduction temperature of 550 ℃ for 2.5h, and reducing the surface layer of the silver copper oxide spindle into a silver copper alloy layer, wherein the thickness of the silver copper alloy layer is controlled to be 3-5% of the diameter of the silver copper oxide spindle;
f) carrying out repressing treatment on the silver-copper oxide composite spindle by adopting a 500T four-column hydraulic press, removing air holes in a silver-copper alloy layer on the surface of the spindle, and compacting the silver-copper alloy layer for 10S;
g) heating the silver copper oxide composite spindle at 750 ℃ for 3h under the protection of argon, extruding the silver copper oxide composite spindle into two silver copper oxide composite strips by adopting backward extrusion equipment, and coating silver copper alloy layers on the bottom surface and two side surfaces of the extruded silver copper oxide strips, wherein the thickness of the silver copper alloy layers is 10-20% of the total thickness of the extruded strips;
h) the silver copper oxide/silver copper strip is rolled, punched and subjected to surface treatment to prepare the flaky electric contact with the working layer of silver copper oxide (12.5) and the welding layer of silver copper (10).
Example four:
a) melting 21.8kg of silver in a graphite crucible of high-pressure water atomization equipment, and loading 3kg of copper oxide powder and 0.2kg of additive powder into a powder spraying device, wherein the average particle size of the copper oxide powder is 2 mu m, and the average particle size of the additive powder is 2 mu m; preparing silver copper oxide mixed powder by adopting powder preparation-powder mixing integrated equipment;
b) drying the silver copper oxide mixed powder, screening by a-200-mesh sieve, and pressing into a silver copper oxide spindle by using a cold isostatic pressing device, wherein the ingot pressing pressure is 250MPa, the pressure maintaining time is 60s, and the diameter of the obtained spindle is 105 mm;
c) sintering the silver copper oxide spindle in an air atmosphere at 880 ℃ for 5 h;
d) carrying out repressing treatment on the silver copper oxide spindle by adopting a 500T four-column hydraulic press for 20s of pressure maintaining time;
e) reducing the silver copper oxide spindle in a hydrogen atmosphere at the reduction temperature of 500 ℃ for 2h, and reducing the surface layer of the silver copper oxide spindle into a silver copper alloy layer, wherein the thickness of the silver copper alloy layer is controlled to be 3-5% of the diameter of the silver copper oxide spindle;
f) carrying out repressing treatment on the silver-copper oxide composite spindle by adopting a 500T four-column hydraulic press, removing air holes in a silver-copper alloy layer on the surface of the spindle, and compacting the silver-copper alloy layer for 20 s;
g) heating the silver copper oxide composite spindle at 750 ℃ for 4h under the protection of argon, extruding the silver copper oxide composite spindle into two silver copper oxide composite strips by adopting backward extrusion equipment, and coating silver copper alloy layers on the bottom surface and two side surfaces of the extruded silver copper oxide strips, wherein the thickness of the silver copper alloy layers is 10-20% of the total thickness of the extruded strips;
the silver copper oxide/silver copper strip is rolled, punched and subjected to surface treatment to prepare the flaky electrical contact with the working layer being silver copper oxide (15) and the welding layer being silver copper (12).
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (3)
1. A preparation method of a silver copper oxide sheet-shaped electric contact is characterized by comprising the following steps:
(1) pressing the silver copper oxide powder into a silver copper oxide spindle through a cold isostatic pressing device, and then sintering in an air atmosphere at the sintering temperature of 800-900 ℃ for 4-8 h;
(2) carrying out re-pressing treatment on the silver copper oxide spindle treated in the step (1) to obtain a silver copper oxide spindle with higher densification degree, and carrying out re-pressing and pressure maintaining for 10-30 s;
(3) reducing the silver copper oxide spindle treated in the step (2) in a hydrogen atmosphere to obtain a silver copper oxide composite spindle with a silver copper alloy layer wrapped on the surface, wherein the reduction temperature is 400-700 ℃, the reduction time is 1-4 h, and the thickness of the silver copper alloy layer is 3-5% of the diameter of the silver copper oxide composite spindle;
(4) carrying out re-pressing treatment on the silver copper oxide composite spindle treated in the step (3), removing air holes in a silver copper alloy layer on the surface of the silver copper oxide composite spindle, and enabling the silver copper alloy layer to be densified, wherein the re-pressing and pressure maintaining time is 10-30 s;
(5) heating the silver copper oxide composite spindle at 700-800 ℃ for 2-4 h under the protection of inert gas, and then extruding two silver copper oxide/silver copper composite strips by adopting backward extrusion equipment;
(6) rolling, punching and surface treating the silver copper oxide/silver copper composite strip to prepare a flaky electric contact with a working layer of silver copper oxide and a welding layer of silver copper alloy;
the silver copper oxide sheet-shaped electric contact comprises the following components in percentage by mass: copper oxide is more than or equal to 10 percent and less than or equal to 15 percent, additive is more than or equal to 0 percent and less than or equal to 2 percent, and the balance is silver; the additives are NiO and SnO2、Bi2O3、ZnO、WO3One or more of them.
2. The method of making a silver copper oxide sheet-like electrical contact according to claim 1, wherein: the thickness of the silver-copper alloy layer of the silver-copper oxide/silver-copper strip obtained by backward extrusion is 10% -20% of the total thickness of the silver-copper oxide/silver-copper strip.
3. A silver copper oxide sheet-like electrical contact produced by the production method according to any one of claims 1 to 2.
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| JPH0754113A (en) * | 1993-08-12 | 1995-02-28 | Tokuriki Honten Co Ltd | Production of ag-oxide composite electric contact material |
| DE4331913A1 (en) * | 1993-09-20 | 1995-03-23 | Siemens Ag | Method for connecting a contact pad made of silver-metal oxide material to a metallic contact carrier |
| FR2916082B1 (en) * | 2007-05-11 | 2009-06-12 | Schneider Electric Ind Sas | METHOD FOR MANUFACTURING MATERIAL FOR AN ELECTRICAL CONTACT PASTILLE, CONTACT PASTILLE PRODUCED BY SUCH A METHOD |
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