KR102054538B1 - Fabrication Method of Ag-Ni-C Composite Clad Strip for Electrical Contact Materials of Magnetic Connector - Google Patents

Abstract

The present invention relates to a method for producing a heavy-silver-nickel-carbon composite clad strip electrical contact for an industrial switch and a clad strip prepared therefrom.

Description

Fabrication Method of Ag-Ni-C Composite Clad Strip for Electrical Contact Materials of Magnetic Connector

The present invention is a heavy-duty silver-nickel-carbon-based composite material used in industrial switches, etc .; Silver (Ag) material; And a method for manufacturing a multilayer clad strip contact including a brazing material and a clad strip contact manufactured by the method.

In general, the electrical contact material is used in electrical equipment such as circuit breakers, switches, switches, electrical equipment, etc., and is an electrical contact element that mechanically operates the opening or closing of a circuit. Electrical contact materials need to prevent accidents such as abnormal consumption, welding, and entanglement under high pressure and high temperature conditions caused by arcs generated when opening and closing electrical circuits to contacts that connect electrical circuits mechanically. . Accordingly, the electrical contact material has a low contact resistance, a high melting point and a sublimation point, a high hardness associated with wear resistance, and a material having excellent electrical life.

Electrical contact materials are classified into heavy load contacts, heavy load contacts, light load contacts, and the like according to their current range and characteristics. Tungsten-based contacts, silver-oxide contacts, precious metal contacts, and the like are classified according to the above materials. Among them, the commonly used contacts are silver-cadmium oxide-based (Ag-CdO).

Silver-Cadmium Oxide (Ag-CdO) contact material absorbs latent heat generated by arc generation due to sublimation characteristics above a certain temperature, and dissipates heat into the atmosphere, which improves welding resistance and arc resistance. It has been used as a contact material, and is mainly used as a cladding structure of three layers of silver-cadmium oxide-based / silver / brazing materials. However, Ag-CdO has a significant portion of the contact material in the manufacturing cost of the switch due to the expensive silver (Ag) of about 30 ~ 60%. In order to reduce this cost burden, the content of cadmium oxide (CdO) is increased, but as the content of cadmium oxide increases, the workability decreases, and the force to agglomerate between oxide particles increases, so that the contact resistance increases and the life of the contact point decreases. This will happen.

In addition, recently, since the Cd component of Ag-CdO is harmful to the human body, its use is limited. In order to solve this problem, an electrical contact manufactured using an oxide alloy such as Sn or In is used instead of Cd. However, due to workability, the content of Sn and In is limited to 12 wt% or less, and is high instead of oxide. Ag-Ni-based alloys with Ni are also being developed, but as the Ni content increases, it becomes more difficult to process the product, and a problem arises that the electrical contact is dropped during operation due to heat generation due to a decrease in electrical conductivity.

The present invention is to solve the problems of the limitation of the content of the oxides used in the conventional electrical contact materials mentioned above and the processing, the carbon material, such as carbon nanotubes (CNT) in Ag-Ni-based alloys To provide a method for producing a clad strip for electrical contact using a silver-nickel-carbon (AgNi-CNT) -based composite material and Ag material, and a brazing material prepared by the compound and a multi-layer clad strip prepared therefrom It is done.

In order to achieve the above object, the present invention is a method for producing a heavy-duty silver-nickel-carbon composite clad strip electrical contact used in an industrial switchgear, (i) silver-nickel-carbon (Ag-Ni-C) Preparing a first billet and a second silver bill (Ag); (ii) roughening the silver-nickel-carbon-based first billet and the silver (Ag) second billet so as to be assembled into one billet, and then using them to form an assembled billet; (iii) forming a plate by hot working the assembly billet; (iv) cold rolling the plate to prepare a multi-layered clad plate of two or more layers including a silver-nickel-carbon (Ag-Ni-C) layer and a silver (Ag) layer; And (v) provides a method for producing a silver-nickel-carbon-based composite clad strip electrical contact for the switch comprising the step of bonding the brazing material to one or both surfaces of the two or more multi-layer cladding plate prepared above.

The present invention also provides a silver-nickel-carbon based multilayer clad strip electrical contact material for a switchgear manufactured by the method described above.

Here, the electrical contact material may include a silver-nickel-carbon based first layer (silver alloy layer) and silver (Ag) in which nickel and carbon powder are uniformly dispersed in a silver matrix; And a third layer (brazing material) made of silver (Ag), copper, and phosphorus.

The electrical contact material according to the present invention, compared to the elongation of the multi-layer clad strip electrical contact dispersed in the existing oxide is 5% or less, it is possible to secure the elongation of 20% or more and can be processed such as rolling additional electrical contact material And, it may have an advantage of reducing the occurrence of cracks during cutting.

The silver-nickel-carbon-based composite material (AgNi-CNT) manufactured in the present invention is capable of processing AgNi material even though it contains more than 30% nickel (Ni), and is represented by the Ag-23% CdO contact used as a current contact. Electrical conductivity above 50% IACS can be achieved.

In addition, the multi-layer clad strip composed of the silver-nickel-carbon-based (AgNi-CNT) composite material and silver (Ag) is an Ag-oxide-based contact material mainly used in an existing industrial switch, particularly silver-cadmium oxide (Ag- Compared with CdO) material, it does not use cadmium (Cd), which is a poisonous substance, and thus has the property of being environmentally friendly.

In addition, since it contains more than 30% Ni compared to Ag-SnO ₂ or Ag-ZnO material, which is recently used in place of Ag-CdO material, it is excellent in economic efficiency by reducing the content of silver (Ag).

Therefore, the present invention can provide a multi-layer clad strip composed of an environmentally friendly AgNi-CNT composite material, a silver (Ag) material, and a brazing material, which are excellent in workability and electrical conductivity even though they contain high Ni content.

1 is a schematic diagram showing a cross section of a multilayer clad strip electrical contact (AgNi-CNT / Ag / brazing material) according to an embodiment of the present invention.
Figure 2 is an image showing the result of the bonding clad of the multi-layer clad strip electrical contact (AgNi-CNT / Ag) in Example 1.
Figure 3 is a schematic diagram showing the shape of the assembled billet assembled in a single form the first billet and the second billet according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail.

In the present invention, to produce a multi-layer electrical contact material that is environmentally friendly, excellent workability and excellent hardness and electrical conductivity even if the nickel content is increased.

To this end, in the present invention, a composite material (first layer) composed of silver-nickel-carbon (eg AgNi-CNT); A method of manufacturing a clad strip electrical contact material [AgNi-CNT / Ag / Brazing material] having a three-layer structure in which silver (Ag) material (second layer) is inserted between a brazing material (third layer) welded with a substitute material. to provide.

More specifically, in the present invention, after constituting the silver-nickel-carbon-based first billet and the silver (Ag) second billet, respectively, they are processed by irregularities so that they can be assembled into one billet to form an assembly billet, and the formed assembly billet AgNi-CNT / Ag / Brazing was manufactured by bonding a brazing material to the prepared clad strip by manufacturing a two-layer clad strip having a layered structure of AgNi-CNT; Clad material of three layers can be produced.

Particularly, in the present invention, as a silver-nickel-carbon-based composite material having excellent hardness and electrical conductivity for manufacturing the multilayer electrical contact material for the switchgear, silver (Ag), nickel (Ni) and carbon-based powder may be used for mixing (混用), but by adjusting the content (composition ratio) and the average particle size of the prepared.

By appropriately adjusting the content of the element, for example nickel and carbon, added to the electrical contact material, the electrical conductivity can be improved while increasing the surface hardness, density and workability of the electrical contact material formed by sintering. In addition, by controlling the average particle size of the above-described powders, it is possible to increase the uniformity in the mixed powder to increase the durability of the final electrical contact material. Moreover, since the usage-amount of silver (Ag) can be reduced by usage-amount of the element added, cost competitiveness can be improved.

In addition, in the present invention, after the silver-nickel-carbon-based first billet and the second silver billet are manufactured in the form of a high-density sintered body through preforming and heat treatment, respectively, one assembly billet is formed and then hot to secure high density. Cold rolling is carried out sequentially through post-processing such as compression and extrusion.

At this time, in the case of the electrical contact containing Ni, the extrusion process is not easy because the relatively strong and high stress compared to Ag is mainly used as a sintered contact, in the present invention for forming a silver-nickel-carbon-based electrical contact By adjusting the composition ratio of the three components to improve the density through extrusion, it is possible to produce a silver-nickel-carbon-based contact material in which the aforementioned components are uniformly distributed. By controlling the manufacturing method, the process conditions, the composition of the contact material and the like in this way, the welding resistance and wear resistance, electrical conductivity, hardness and the like of the multi-layered electrical contact material to be finally manufactured can be further improved (see Table 1 below).

<Silver-nickel-carbon composite clad strip electrical contact for switchgear>

Hereinafter, a method of manufacturing a silver-nickel-carbon-based composite clad strip electrical contact for a switch according to the present invention will be described. However, it is not limited only by the following manufacturing method, and the steps of each process may be modified or optionally mixed as necessary.

The silver-nickel-carbon composite clad strip electrical contact (eg, AgNi-CNT / Ag / BCuP-5) is a silver-nickel-carbon (AgNi-CNT) first layer; and silver (Ag) -based Preparing a clad strip of two layers consisting of two layers; And bonding a brazing material (eg, BCuP-5) to the surface of the clad strip of the two layers.

For example, (i) a silver-nickel-carbon (Ag-Ni-C) based first billet and a silver (Ag) second, for manufacturing the silver-nickel-carbon based composite clad strip electrical contact Preparing each billet ('S10' step); (ii) after the uneven processing of the silver-nickel-carbon-based first billet and the silver (Ag) second billet to be assembled into one billet, respectively, to form an assembled billet using these ('S20' step); (iii) forming a plate by hot working the assembly billet ('S30' step); (iv) cold rolling the plate to produce a multi-layered clad plate including two layers of silver-nickel-carbon (Ag-Ni-C) and silver (Ag) ('S40'); And (v) bonding the brazing material to one or both surfaces of the prepared multi-layer cladding plate material ('S50').

Hereinafter, the manufacturing method will be described by dividing each step as follows.

(i) preparing a silver-nickel-carbon (Ag-Ni-C) -based first billet and a silver (Ag) second billet, respectively ('S10' step).

In the step S10, the silver-nickel-carbon (Ag-Ni-C) based first billet and the silver (Ag) second billet may be manufactured according to a conventional method known in the art.

More specifically, a preferred example for preparing a silver-nickel-carbon (Ag-Ni-C) -based first billet, (a) after mixing the silver powder, nickel powder, and carbon-based powder, the mixed powder Preparing a preform by pressing ('S10-1 step'); And (b) sintering the preform to ensure the density of the billet ('S10-2').

Silver, which is the main component constituting the silver-nickel-carbon (Ag-Ni-C) -based first billet, has a high electrical conductivity and thus has low contact resistance. It has the advantage of being small. The nickel (Ni) and carbon (C) -based powders have an advantage of high electrical conductivity and hardness.

The average particle size of the silver, nickel and carbon-based powders is not particularly limited, but in order to increase the durability of the electrical contact material by being uniformly dispersed during the preparation of the mixed powder, the average particle size is preferably adjusted to 10 to 200 μm, more preferably. Range from 10 to 100 μm.

In the step S10-1, silver and nickel powder may be used without limitation conventional ones known in the art. In addition, the carbon-based powder can be used without limitation conventional carbon-based components known in the art, for example, graphite, carbon nanotubes (CNT), graphene (activated carbon) or a mixture of one or more thereof Etc. Preferably, carbon nanotubes (CNT) are used. The carbon nanotubes (CNT) are excellent in electrical conductivity and strength and strong in elasticity, and are thus easily carried out afterwards such as extrusion and rolling.

In addition, silver (Ag) powder is the main component constituting the electrical contact material of the present invention, the content thereof is preferably 60 to 65% by weight based on 100% by weight of the total mixed powder.

In addition, the content of the nickel (Ni) powder is preferably 30 to 35% by weight based on 100% by weight of the total mixed powder. In this case, when the content of the nickel powder satisfies the above-described range, the welding resistance of the electrical contact material may be improved, and the excellent contact resistance and processability of the manufactured electrical contact material may be exhibited.

In addition, the content of the carbon-based powder is preferably 0.2 to 2% by weight based on 100% by weight of the mixed powder. When the content of the carbon-based powder is less than 0.2% by weight, it may be difficult to improve the electrical conductivity and hardness of the prepared electrical contact material, and when the content of the carbon-based powder exceeds 2% by weight, the contact resistance of the manufactured electrical contact material may be increased, resulting in processability. Can be degraded.

Meanwhile, in the step S10-1, the mixing of the silver powder, the nickel powder and the carbon-based powder may be performed according to a conventional method known in the art, for example, a ball mill or planetary mill. It can be mechanically mixed using a bead mill or the like. The mixing process conditions are not particularly limited and may be appropriately adjusted within the range known in the art.

Thereafter, a preform is produced using the mixed powder.

The preform manufacturing step (S10-1 step) and the high density molded article manufacturing step (S10-2 step) is a step to secure the density by performing the preforming and sintering using the above-described mixed powder.

As a preferred example of the step S10-1, the prepared mixed powder is put into a hydraulic press and then pressurized to produce a preform. At this time, the conditions to apply to the mixed powder put into the hydraulic press are not specifically limited, For example, a pressure is 80-150 MPa range, temperature is normal temperature (RT), and time is preferable about 1 to 10 minutes. By manufacturing the preform as described above first, it is possible to increase the density of the molded product to be produced later.

The preform manufactured above is sintered to produce a high density molded body (hereinafter referred to as 'S10-2 step').

In the step S10-2, the method of sintering the preform may be carried out without limitation to conventional methods known in the art, for example, high temperature heat treatment may be applied.

At this time, the temperature for sintering the preform is not particularly limited, but is preferably in the range of 600 to 900 ° C. When the sintering temperature is less than 600 ℃ sintering between the silver powder and nickel, carbon-based powder may not occur smoothly, when the sintering temperature exceeds 900 ℃, the molded body is melted or deformed shape uniformity of the molded body This can be degraded. In addition, the sintering time is not particularly limited, but is preferably performed for 2 to 9 hours.

The silver-nickel-carbon-based first billet molded body sintered as described above can secure a high density, wherein the relative density of the silver-nickel-carbon-based first billet molded body is preferably 90% or more.

The silver (Ag) second billet of step S10 may be prepared by performing the same process as the process for preparing the silver-nickel-carbon-based first billet described above. In one example, silver billets may be produced by sintering silver powder. The prepared silver (Ag) second billet can also ensure a high density, wherein the relative density of the silver (Ag) second billet molded body is preferably 90% or more.

(ii) the silver-nickel-carbon-based first billet and the silver (Ag) second billet are respectively processed to form a billet to form an assembled billet ('S20' step).

The high-density silver-nickel-carbon-based first billet and the silver (Ag) second billet prepared as described above are respectively processed and assembled into one single form of assembled billet as shown in FIG. 3.

Shape processing that can be used in the step S20 can be carried out without limitation to the conventional uneven processing known in the art, for example may be selected from the group consisting of machining and electrical discharge machining. Preferably, the silver-nickel-carbon first billet is subjected to electric discharge machining, and the silver (Ag) -based second billet is machined into uneven shapes so that the two sintered bodies can be assembled into one billet through machining. .

(iii) by hot working the assembly billet to produce a high density plate ('S30 step).

In step S30, a high-density sheet is formed through hot processing of the assembled billet of the silver-nickel-carbon-based first billet and the silver (Ag) second billet formed in the previous step S20.

The hot working can be carried out without limitation to conventional post-processing known in the art, for example, hot compression, hot extrusion, or both can be carried out. At this time, it is preferable to perform hot compression and hot extrusion sequentially in order to secure the density by performing hot compression first, and then to manufacture a high-density sheet through hot extrusion.

The method of hot compressing the granulated billet is not particularly limited, and for example, after the heat treatment at a temperature of 600 to 900 ° C., a pressure of about 150 to 170 MPa is applied, and the heat treatment is preferably performed for 2 to 4 hours. The assembled billet manufactured through such hot compression may have a high density of more than 95% by bonding AgNi-CNT material and Ag material.

Through the heat treatment described above, it is possible to remove the foreign matter formed on the surface of the assembly billet, to release the material can be easily performed after the extrusion process.

In addition, the hot extrusion conditions are also not particularly limited, for example, a pressure of about 170 ~ 220kg / cm ² , wherein the assembly billet (Billet) in the range of about 550 ~ 850 ℃ 5 minutes to 2 hours, preferably 10 ~ 30 Hold for a minute to facilitate hot extrusion.

Extruded material produced through the above process is composed of two layers of AgNi-CNT and Ag, the relative density is preferably 99% or more.

Meanwhile, in the present invention, if necessary, between the step S30 and step S40, or after the step S40, may further include a heat treatment step. At this time, the heat treatment condition is preferably heat treatment for 1 to 3 hours at a temperature of 400 ~ 600 ℃, but is not particularly limited thereto.

(iv) cold-rolled the produced extruded material (hereinafter referred to as 'S40 step').

Cold rolling in the step S50 may be used without limitation the conventional cold rolling process known in the art. Through such cold rolling, hardness and density can be secured.

In the present invention, a multi-layered clad plate material including two or more layers including a silver-nickel-carbon (Ag-Ni-C) layer and a silver (Ag) layer is manufactured through the above-described step S40.

(v) Bonding the brazing material to one or both surfaces of the multi-layered clad plate material prepared above (hereinafter referred to as 'S50 step').

In the step S50 is a step of bonding the Ag-based brazing material containing Cu and P to the two-layer AgNi-CNT / Ag cladding plate rolled in the previous step S40, a conventional atmosphere brazing method or mechanical bonding method known in the art Can be used without limitation.

Here, the brazing material may be used without limitation conventional filler metal materials known in the art, for example, including two or more selected from the group consisting of copper (Cu), silver (Ag) and phosphorus (P). It may be a composition in the form of an alloy.

According to a preferred embodiment of the present invention, the brazing material is an alloy of copper (Cu), silver (Ag) and phosphorus (P), and silver (Ag): phosphorus (P) in the weight ratio of silver (Ag) and phosphorus (P). = 14.5 ~ 15.5: it may be a strip-shaped strip material produced by hot extrusion of a circular billet (melt) prepared by melting in the range of 4.8 ~ 5.3. In this case, the remaining amount excluding silver (Ag) and phosphorus (P) based on the total 100 parts by weight may be 79.2 to 80.7 parts by weight of copper.

Through this step, it is possible to obtain a multi-layer electrical contact having excellent electrical conductivity, high hardness and bonding strength. If necessary, it is also within the scope of the present invention to manufacture a multi-layered electrical contact material by further bonding another metal plate made of the same material or different materials.

<Silicon-Nickel-Carbon Composite Composite Multi-layer Electrical Contact Material>

On the other hand, the present invention provides a silver-nickel-carbon-based multilayer clad electrical contact material for the switchgear manufactured by the manufacturing method.

Here, the electrical contact material is (i) a silver-nickel-carbon (Ag-Ni-C) based first layer (silver alloy layer), in which nickel and carbon powder are uniformly dispersed in an Ag matrix, (ii) a second layer made of silver (Ag); And (iii) a third layer (brazing material) made of silver (Ag), copper and phosphorus. More specifically, the electrical contact material may be a three-layer clad electrical contact material composed of AgNi-CNT / Ag / Brazing material.

In this case, the silver-nickel-carbon alloy layer (first layer) has a structure in which nickel and carbon powder are uniformly dispersed in the silver matrix, and thus have excellent electrical conductivity and hardness. In one example, the electrical conductivity is in the range of 50 to 60% IACS, and the hardness is preferably in the range of 100 to 130 Hv.

The electrical contact material may have a multi-layered structure of 3 to 5 layers, and may be configured by further inserting different dissimilar materials as necessary.

Since the multilayer electrical contact material according to the present invention exhibits excellent hardness and electrical conductivity, it is a technical field requiring wear resistance and welding resistance, for example, a contact material such as a circuit breaker, a switch, a switch, a relay, or an electrical appliance or an electrical installation. It is preferably used as. However, the present invention is not particularly limited thereto and may be applied without limitation to all other uses to which the contact material of the above-described configuration may be applied.

Hereinafter, the present invention will be described in detail with reference to Examples, but the following Examples are merely illustrative of one embodiment of the present invention, and the scope of the present invention is not limited by the following Examples.

Example 1

About 63% by weight of silver (Ag), about 35% by weight of nickel (Ni), and about 2% by weight of CNT (carbon based) were mixed, respectively, and a mixed powder was obtained by using a ball mill. Thereafter, the mixed powder was maintained at 90 MPa pressure for 1 minute using a compression press to prepare an Ag-Ni-CNT molded body, and a silver (Ag) molded body was prepared according to the same process using a separate Ag powder. The Ag-Ni-CNT molded bodies and Ag molded bodies prepared above were maintained for about 6 hours at about 850 ° C. in a vacuum atmosphere to obtain a high density sintered body having a relative density of about 90% or more.

For each of the obtained sintered bodies, the AgNi-CNT sintered body was subjected to electric discharge machining, and the Ag sintered body was machined to have a shape as shown in FIG. 3 so that two sintered bodies could be assembled into one billet, and then hot compression was performed. . At this time, the assembly billet (Billet) was maintained for 10 minutes at 750 ℃, the compression pressure was about 150kg / cm ² with a relative density of about 95% or more can be obtained. Thereafter, hot extrusion was performed on the compressive material. At this time, the hot extrusion was performed in a tape shape with an extrusion pressure of 200 kg / cm ² while maintaining the compressed material at about 750 ° C. for 10 minutes. AgNi-CNT / Ag two-layer cladding material was prepared by subjecting the prepared extruded material to heat treatment at about 500 ° C. for 2 hours, followed by cold rolling.

The bonding surface of the prepared AgNi-CNT / Ag cladding part was observed in FE-SEM. As shown in FIG. 1, no defects such as voids or cracks were observed at the interface, and it was confirmed that they were well bonded to each other.

Subsequently, the AgNi-CNT / Ag two-layer clad material was brazed in a nitrogen atmosphere at 680 ° C. in a BCuP-5 material composed of Ag-Cu-P to a three-layer clad material of AgNi-CNT / Ag / BCuP-5. Prepared.

Experimental Example 1 Evaluation of Physical Properties of Multilayer Electrical Contact Materials

Using the electrical contact material prepared in Example 1 and the electrical contact material of Comparative Example 1 (Ag-23% CdO / Ag / BCuP-5) used in the conventional switchgear, their physical properties were evaluated as follows.

At this time, the method and criteria of the following physical property evaluation are as follows.

1) Hardness was measured using a Vickers hardness tester, and maintained for 10 seconds at a load of 300g.

2) The electrical conductivity is expressed as% IACS through unit conversion after measuring the specific resistance.

3) Bond strength shows the maximum strength when the electrical contact material is welded to the base made of copper or copper-nickel alloy and then fractured by pushing the joint between the base and the electrical contact.

4) The service life evaluation was performed by joining the electrical contacts to the moving and stator substitutes, assembling the switch, and using the test conditions indicated in the AC4 electrical test task specified in Korean Industrial Standard KSC 4504.

characteristic Comparative Example 1
(Ag-23% CdO / Ag / BCuP-5) Example 1
(AgNi-CNT / Ag / BCuP-5) Hardness (Hv) 105 110 Electrical Conductivity (% IACS) 50 52 Bond strength (kgf / cm ² ) 280 285 Service life (times) 140,000 160,000

As shown in Table 1, the multilayer electrical contact material of Example 1 has excellent physical properties in terms of hardness, electrical conductivity, bonding strength and service life, compared to the electrical contact material of Comparative Example 1 used in the conventional switchgear. I could confirm that.

Therefore, it can be seen that the multilayer electrical contact material of the present invention can be usefully used as an electrical contact material having improved weldability and wear resistance as it has high hardness and excellent electrical conductivity.

Claims (11)

As a method for producing a silver-nickel-carbon (AgNi-C) multilayer clad strip electrical contact,
(i) preparing a silver-nickel-carbon (Ag-Ni-C) based first billet and a silver (Ag) second billet respectively;
(ii) roughening the silver-nickel-carbon-based first billet and the silver (Ag) second billet so as to be assembled into one billet, and then using them to form an assembled billet;
(iii) forming a plate by hot working the assembly billet;
(iv) cold rolling the plate to prepare a multi-layered clad plate of two or more layers including a silver-nickel-carbon (Ag-Ni-C) layer and a silver (Ag) layer; And
(v) bonding the brazing material to one or both surfaces of the prepared multi-layer cladding plate material, wherein
In the step (i), the silver-nickel-carbon based billet,
(a) 60-65 wt% silver (Ag) powder, 30-35 wt% nickel (Ni) powder, and 0.2-2 wt% carbon-based powder were mixed, and then the mixed powder was put into a hydraulic press. Preparing a preform by pressing under normal temperature and a pressure of 80-150 MPa; And
(b) sintering the preform at 600 ° C to 900 ° C to prepare a silver-nickel-carbon based first billet having a density;
Method for producing a silver-nickel-carbon-based composite clad strip electrical contact for switchgear comprising a. delete The method of claim 1,
Particle size of each powder of the step (a) is a manufacturing method of the silver-nickel-carbon-based composite clad strip electrical contact for switchgear, characterized in that adjusted to the range of 10 to 200㎛. delete The method of claim 1,
The carbon of step (i) is prepared from the group consisting of graphite, carbon nanotubes (CNT), graphene (graphene) and activated carbon, the production of silver-nickel-carbon-based composite clad strip electrical contact for switch Way. The method of claim 1,
Step (ii) is a silver-nickel-carbon composite for switchgear, characterized in that the first billet and the second billet is subjected to the shape processing selected from the group consisting of electric discharge machining and machining, and then assembled into a single billet Method of making clad strip electrical contacts. The method of claim 1,
In the step (iii), the hot working is a manufacturing method of the silver-nickel-carbon composite composite clad strip electrical contact for the switchgear, characterized in that performing hot compression and hot extrusion. The method of claim 7, wherein
The hot compression of the step (iii) is a silver-nickel-carbon composite for switchgear, characterized in that the assembly billet is maintained at a temperature of 150 ~ 170kg / cm ² after maintaining the assembly billet at 600 ~ 900 ℃ temperature for 10-30 minutes Method of making clad strip electrical contacts. The method of claim 7, wherein
The hot extrusion of the step (iii) is a silver-nickel-carbon system for a switchgear, characterized in that the assembly billet is maintained at a temperature of 550 ~ 850 ℃ for 10-30 minutes and carried out at a pressure of 170 ~ 220kg / cm ² Method for manufacturing composite clad strip electrical contacts. The method of claim 1,
The brazing material of step (v) is a silver-nickel-carbon for switchgear, characterized in that the composition of the alloy form containing two or more selected from the group consisting of copper (Cu), silver (Ag) and phosphorus (P). Method of manufacturing a composite clad strip electrical contact. The method of claim 1,
The brazing material of the step (v) is silver (Ag), phosphorus (P) and copper (Cu) 14.5 ~ 15.5: 4.8 ~ 5.3: 79.2 ~ 80.7, the silver-nickel-carbon system for switchgear, characterized in that Method for manufacturing composite clad strip electrical contacts.

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