CN115764346B - Copper-aluminum eutectic transition wire clamp and preparation method thereof - Google Patents
Copper-aluminum eutectic transition wire clamp and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of copper-aluminum transition wire clamps, and particularly relates to a copper-aluminum eutectic transition wire clamp and a preparation method thereof. The invention provides a copper-aluminum eutectic transition wire clamp, which comprises base metal copper and base metal aluminum, wherein a joint structure between the base metal copper and the base metal aluminum consists of Cu-Al eutectic and CuAl 2 Brittle phase composition. The copper-aluminum eutectic transition wire clamp has a single phase of a joint structure, and only contains Cu-Al eutectic and CuAl which are composed of Cu and Al elements 2 The brittle phase has high joint strength and good corrosion resistance, and has wide application prospect in the field of high-performance copper-aluminum wire clamps.
Description
Technical Field
The invention belongs to the technical field of copper-aluminum transition wire clamps, and particularly relates to a copper-aluminum eutectic transition wire clamp and a preparation method thereof.
Background
The copper-aluminum wire clamp is an important connecting part of the transformer substation and is mainly used for connecting an aluminum wire and a copper outgoing terminal. The existing copper-aluminum wire clamp is generally prepared by adopting a brazing method. The brazing type copper-aluminum wire clamp is a copper-aluminum transition part formed by brazing a thin copper sheet with the thickness of 1-2mm on the surface of a thick aluminum plate. At present, the brazing method of the copper-aluminum wire clamp comprises welding modes such as flame brazing, furnace brazing, induction brazing and the like. In comparison, induction brazing is a simple and efficient metal joining process, and has significant advantages for copper-aluminum wire clip brazing. However, because the copper aluminum wire clamp is in large-area contact brazing, and the common zinc aluminum brazing filler metal is poor in wettability on a copper base metal and low in material strength, the joint strength of the traditional induction brazing is low, and tripping of main equipment and large-area power failure are easily caused after the copper aluminum wire clamp is used, so that normal production and life are affected.
In addition, the brazing filler metal is inevitably used in the brazing process of the existing copper-aluminum wire clamps, and the brazing filler metal is generally different from a base metal, such as the most commonly used Zn-Al brazing filler metal, and the joint structure after brazing is mainly Zn-Al eutectic, alpha-Al, eta-Zn and a small amount of CuAl 2 ，η-Zn standard electrode potential-0.763, alpha-Al standard electrode potential-1.66, cuAl 2 The standard electrode potential is-0.53, the Cu standard electrode potential is +0.335, the alpha-Al phase electrode potential is the lowest, and the phase electrode potential of the brazing filler metal is easy to be unbalanced, so that electrochemical corrosion is easy to generate, and potential safety hazards are caused.
In order to solve the defects, development of a copper-aluminum transition wire clamp with excellent combination strength and corrosion resistance is urgently needed.
Disclosure of Invention
The first aim of the invention is to provide a copper-aluminum eutectic transition wire clamp which has high joint strength and good corrosion resistance.
The second aim of the invention is to provide a preparation method of the copper-aluminum eutectic transition wire clamp, which can realize the preparation of the high-strength and corrosion-resistant copper-aluminum transition wire clamp and is suitable for industrial application.
In order to achieve the purpose, the copper-aluminum eutectic transition wire clamp adopts the following technical scheme:
a copper-aluminum eutectic transition wire clamp comprises base metal copper and base metal aluminum, wherein a joint structure between the base metal copper and the base metal aluminum is formed by Cu-Al eutectic and CuAl 2 Brittle phase composition.
The copper-aluminum eutectic transition wire clamp provided by the invention has no other elements in a joint structure, and only contains Cu-Al eutectic and CuAl composed of Cu and Al elements 2 Brittle phase, high joint strength and good corrosion resistance.
Further, the CuAl 2 The brittle phase is distributed on the copper side of the base metal, and the Cu-Al eutectic is distributed on the center of the braze joint of the joint and the aluminum side of the base metal.
Preferably, the base aluminum side is free of aluminum-based solid solutions. The strength of the transition clamps without aluminum-based solid solutions is higher.
The preparation method of the copper-aluminum eutectic transition wire clamp provided by the invention adopts the technical scheme that the preparation method comprises the following steps:
(1) Coating a connecting agent on the surface to be welded of the copper plate; the connecting agent consists of the following components in parts by mass: NH (NH) 4 OH 50-75 parts, csF-AlF 3 5-20 parts of absolute ethyl alcohol and 5-10 parts of water-free ethanol;
(2) And attaching and fixing the surface to be welded of the aluminum plate and the surface to be welded of the copper plate coated with the connecting agent, and then applying pressure to perform induction brazing to obtain the copper-aluminum eutectic transition wire clamp.
The invention discloses a preparation method of a copper-aluminum eutectic transition wire clamp, which comprises the steps of coating a connecting agent on a surface to be welded of a copper plate, and then carrying out induction welding with an aluminum plate to prepare the transition wire clamp. Wherein, the connecting agent adopted by the invention is NH 4 OH、CsF-AlF 3 And mixtures of absolute alcohols, NH 4 OH decomposes to release NH during heating 3 Gas and water vapor, NH 3 The gas can protect the parent metal and the welding line from oxidation, csF-AlF 3 The aluminum brazing flux has the functions of removing films and preventing oxidation. When the joint is soldered by induction, NH exists in the whole process 3 The gas and the aluminum brazing flux are protected from oxidation, the copper base metal and the aluminum base metal are tightly contacted under certain pressure, and therefore eutectic reaction occurs, and the wire clamp containing the copper-aluminum eutectic joint is obtained.
In the method of the invention, the brazing flux component CsF-AlF 3 Is a corrosion-free aluminum soldering flux, belongs to inorganic salt, has the activity temperature of 480-500 ℃, starts to decompose to generate activity after reaching the activity temperature, and is CsF-AlF 3 Most of the gas is decomposed and produced at the end of brazing, and the small part of the gas produces residues with smaller density, which are adhered to the surface of the weld metal (with smaller density than the metal), and can be directly removed by adopting a conventional cleaning means (water cleaning), so that CsF-AlF 3 The structure and the composition of the soldered seam are not affected after soldering.
The material of the copper plate and the aluminum plate is not particularly limited, and can be routinely selected by a person skilled in the art according to the needs. For example, T2 red copper can be used as the copper plate; the aluminum plate is selected from any one of pure aluminum L01, L02, L03, L04 and aluminum alloy 3003.
The surface to be welded of the copper plate and the aluminum plate is preferably required to be degreased and oxidized film on the surface in advance in view of the welding effect.
In step (1), preferably, the coating thickness of the connecting agent is 5 to 10 μm.
To further changeThe joint strength and corrosion resistance of the cable clamp are preferably 7-10 mu m; the connecting agent consists of the following components in parts by mass: NH (NH) 4 OH 60-70 parts, csF-AlF 3 12-20 parts of absolute ethyl alcohol and 8-10 parts of absolute ethyl alcohol.
Further, the linking agent is NH 4 OH、CsF-AlF 3 The absolute ethyl alcohol is stirred into paste according to the mass parts and then used.
Preferably, in step (2), the pressure is applied at 0.5 to 2.0MPa.
The eutectic temperature of Cu-Al is 548 ℃. In a further preferable mode, in the step (2), the temperature of the induction brazing is 540 to 560 ℃ and the time of the induction brazing is 15 to 20 seconds.
Compared with the prior art, the invention has the beneficial effects that:
(1) The copper-aluminum eutectic transition wire clamp provided by the invention has a single joint structure phase, and only contains Cu-Al eutectic and CuAl 2 Brittle phase, high joint strength and good corrosion resistance;
(2) In the preparation process of the copper-aluminum eutectic transition wire clamp, brazing filler metal is not needed, and NH is protected by a solid medium 4 NH generated by OH 3 The Cu and Al atoms are excited to diffuse rapidly and realize a rapid eutectic reaction, and the method is simple and has high efficiency.
Drawings
FIG. 1 is a microscopic topography of the joint structure of the copper aluminum eutectic transition wire clip of example 1 of the present invention;
FIG. 2 is a graph showing the microscopic morphology comparison of the joint structure of the copper-aluminum transition clamps of the present invention in example 1 and comparative examples 1-2.
Detailed Description
The technical scheme of the invention is further described below with reference to the specific embodiments. It will be appreciated by those skilled in the art that the following examples are illustrative of the present invention and are not to be construed as limiting the scope of the invention. The specific conditions not specified in the examples were carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were all conventional products obtained from commercial sources.
In the following examples, the copper plate used was T2 red copper, and the aluminum plate was aluminum alloy 3003.
Example 1
The copper-aluminum eutectic transition wire clamp provided by the embodiment comprises base metal copper and base metal aluminum, wherein a joint structure between the base metal copper and the base metal aluminum consists of Cu-Al eutectic and CuAl 2 Brittle phase composition. CuAl (CuAl) 2 The brittle phase is distributed on the copper side of the base metal, and the Cu-Al eutectic is distributed on the center of the braze joint of the joint and the aluminum side of the base metal. The aluminum side of the base material does not contain an aluminum-based solid solution.
The preparation method of the copper-aluminum eutectic transition wire clamp comprises the following steps:
(1) Removing greasy dirt and an oxidation film on the surface to be welded of the copper plate and the aluminum plate, and coating a connecting agent on the surface to be welded of the copper plate; the connecting agent is used after being stirred into paste by the following components in parts by mass: NH (NH) 4 OH50 parts, csF-AlF 3 5 parts of absolute ethyl alcohol; the coating thickness of the connecting agent was 5. Mu.m.
(2) And (3) attaching the surface to be welded of the aluminum plate to the surface to be welded of the copper plate coated with the connecting agent, fixing the surface to be welded by adopting a clamp, then applying pressure of 0.5MPa, placing the fixed copper-aluminum composite plate at a proper position on a coil of an induction welding machine, opening an induction welding power supply for induction brazing, flowing out liquid metal from a brazing seam, stopping heating, and cleaning the surface of the wire clamp by adopting water after cooling to obtain the copper-aluminum eutectic transition wire clamp. Wherein the temperature of the induction brazing is 540 ℃, and the time of the induction brazing is 15s.
Example 2
The copper-aluminum eutectic transition wire clamp provided by the embodiment comprises base metal copper and base metal aluminum, wherein a joint structure between the base metal copper and the base metal aluminum consists of Cu-Al eutectic and CuAl 2 Brittle phase composition. CuAl (CuAl) 2 The brittle phase is distributed on the copper side of the base metal, and the Cu-Al eutectic is distributed on the center of the braze joint of the joint and the aluminum side of the base metal. The aluminum side of the base material does not contain an aluminum-based solid solution.
The preparation method of the copper-aluminum eutectic transition wire clamp comprises the following steps:
(1) Removing greasy dirt and oxide film on the surface to be welded of the copper plate and the aluminum plate, and then welding the copper plateCoating a connecting agent on the surface; the connecting agent is used after being stirred into paste by the following components in parts by mass: NH (NH) 4 OH 55 parts, csF-AlF 3 8 parts of absolute ethyl alcohol and 6 parts of absolute ethyl alcohol; the coating thickness of the connecting agent was 6. Mu.m.
(2) And (3) attaching the surface to be welded of the aluminum plate to the surface to be welded of the copper plate coated with the connecting agent, fixing the surface to be welded by adopting a clamp, then applying pressure of 1.0MPa, placing the fixed copper-aluminum composite plate at a proper position on a coil of an induction welding machine, opening a power supply for induction welding for induction brazing, flowing out liquid metal from a brazing seam, stopping heating, and cleaning the surface of the wire clamp by adopting water after cooling to obtain the copper-aluminum eutectic transition wire clamp. Wherein the temperature of the induction brazing is 550 ℃, and the time of the induction brazing is 20s.
Example 3
The copper-aluminum eutectic transition wire clamp provided by the embodiment comprises base metal copper and base metal aluminum, wherein a joint structure between the base metal copper and the base metal aluminum consists of Cu-Al eutectic and CuAl 2 Brittle phase composition. CuAl (CuAl) 2 The brittle phase is distributed on the copper side of the base metal, and the Cu-Al eutectic is distributed on the center of the braze joint of the joint and the aluminum side of the base metal. The aluminum side of the base material does not contain an aluminum-based solid solution.
The preparation method of the copper-aluminum eutectic transition wire clamp comprises the following steps:
(1) Removing greasy dirt and an oxidation film on the surface to be welded of the copper plate and the aluminum plate, and coating a connecting agent on the surface to be welded of the copper plate; the connecting agent is used after being stirred into paste by the following components in parts by mass: NH (NH) 4 OH 60 parts, csF-AlF 3 12 parts of absolute ethyl alcohol 8 parts; the coating thickness of the connecting agent was 7. Mu.m.
(2) And (3) attaching the surface to be welded of the aluminum plate to the surface to be welded of the copper plate coated with the connecting agent, fixing the surface to be welded by adopting a clamp, then applying pressure of 1.5MPa, placing the fixed copper-aluminum composite plate at a proper position on a coil of an induction welding machine, opening an induction welding power supply for induction brazing, flowing out liquid metal from a brazing seam, stopping heating, and cleaning the surface of the wire clamp by adopting water after cooling to obtain the copper-aluminum eutectic transition wire clamp. Wherein the temperature of the induction brazing is 560 ℃, and the time of the induction brazing is 20s.
Example 4
The copper-aluminum eutectic transition wire clamp provided by the embodiment comprises base metal copper and base metal aluminum, wherein a joint structure between the base metal copper and the base metal aluminum consists of Cu-Al eutectic and CuAl 2 Brittle phase composition. CuAl (CuAl) 2 The brittle phase is distributed on the copper side of the base metal, and the Cu-Al eutectic is distributed on the center of the braze joint of the joint and the aluminum side of the base metal. The aluminum side of the base material does not contain an aluminum-based solid solution.
The preparation method of the copper-aluminum eutectic transition wire clamp comprises the following steps:
(1) Removing greasy dirt and an oxidation film on the surface to be welded of the copper plate and the aluminum plate, and coating a connecting agent on the surface to be welded of the copper plate; the connecting agent is used after being stirred into paste by the following components in parts by mass: NH (NH) 4 OH 68 parts, csF-AlF 3 16 parts of absolute ethyl alcohol 9 parts. The coating thickness of the connecting agent was 8. Mu.m.
(2) And (3) attaching the surface to be welded of the aluminum plate to the surface to be welded of the copper plate coated with the connecting agent, fixing the surface to be welded by adopting a clamp, then applying pressure of 1.8MPa, placing the fixed copper-aluminum composite plate at a proper position on a coil of an induction welding machine, opening an induction welding power supply for induction brazing, flowing out liquid metal from a brazing seam, stopping heating, and cleaning the surface of the wire clamp by adopting water after cooling to obtain the copper-aluminum eutectic transition wire clamp. Wherein the temperature of the induction brazing is 560 ℃, and the time of the induction brazing is 20s.
Example 5
The copper-aluminum eutectic transition wire clamp provided by the embodiment comprises base metal copper and base metal aluminum, wherein a joint structure between the base metal copper and the base metal aluminum consists of Cu-Al eutectic and CuAl 2 Brittle phase composition. CuAl (CuAl) 2 The brittle phase is distributed on the copper side of the base metal, and the Cu-Al eutectic is distributed on the center of the braze joint of the joint and the aluminum side of the base metal. The aluminum side of the base material does not contain an aluminum-based solid solution.
The preparation method of the copper-aluminum eutectic transition wire clamp comprises the following steps:
(1) Removing greasy dirt and an oxidation film on the surface to be welded of the copper plate and the aluminum plate, and coating a connecting agent on the surface to be welded of the copper plate; the connecting agent is used after being stirred into paste by the following components in parts by mass: NH (NH) 4 OH 70 parts, csF-AlF 3 20 parts of absolute ethyl alcohol 10 parts. The coating thickness of the connecting agent was 10. Mu.m.
(2) And (3) attaching the surface to be welded of the aluminum plate to the surface to be welded of the copper plate coated with the connecting agent, fixing the surface to be welded by adopting a clamp, then applying pressure of 2.0MPa, placing the fixed copper-aluminum composite plate at a proper position on a coil of an induction welding machine, opening an induction welding power supply for induction brazing, flowing out liquid metal from a brazing seam, stopping heating, and cleaning the surface of the wire clamp by adopting water after cooling to obtain the copper-aluminum eutectic transition wire clamp. Wherein the temperature of the induction brazing is 560 ℃, and the time of the induction brazing is 20s.
Comparative example 1
The copper-aluminum transition wire clamp provided in comparative example 1 is prepared by adopting Zn98Al solder to match CsF-AlF 3 And a copper-aluminum transition wire clamp obtained by brazing flux induction brazing.
The copper-aluminum transition wire clamp of the comparative example comprises the following specific preparation steps:
(1) Firstly removing greasy dirt and oxidation films on the surfaces to be welded of a copper plate and an aluminum plate, then placing a Zn98Al brazing filler metal sheet (the mass percentage is Zn98 percent, al2 percent, and the size of the brazing filler metal sheet is the same as the size of the surface to be welded) with the thickness of 0.5mm on the surface to be welded of the copper plate, and scattering a layer of CsF-AlF on the surface of the brazing filler metal sheet 3 Brazing flux powder;
(2) And (3) attaching the surface to be welded of the aluminum plate to the surface to be welded of the copper plate after the brazing flux powder is scattered, fixing the surface to be welded by adopting a clamp, then applying pressure of 0.5MPa, placing the fixed copper-aluminum composite plate at a proper position on a coil of an induction welder, starting an induction welding power supply to perform induction brazing, flowing out liquid metal from a brazing seam, and stopping heating to obtain the copper-aluminum eutectic transition wire clamp. Wherein the temperature of the induction brazing is 500 ℃, and the time of the induction brazing is 15s.
Comparative example 2
The copper-aluminum transition wire clamp provided in comparative example 2 is prepared by adopting BAl67CuSi solder to match CsF-AlF 3 And a copper-aluminum transition wire clamp obtained by brazing flux induction brazing.
The copper-aluminum transition wire clamp of the comparative example comprises the following specific preparation steps:
(1) Firstly removing greasy dirt and oxidation film on the surface to be welded of copper plate and aluminium plate, then placing BAl67CuSi solder sheet (qualityThe percentages are 67 percent of Al, 28 percent of Cu and 6 percent of Si, the size of the solder sheet is the same as the size of the surface to be welded, and a layer of CsF-AlF is scattered on the surface of the solder sheet 3 Brazing flux powder;
(2) And (3) attaching the welding surface of the aluminum plate to the copper plate to be welded after the brazing flux powder is scattered, fixing the copper plate to be welded by adopting a clamp, then applying pressure of 0.5MPa, placing the fixed copper-aluminum composite plate at a proper position on a coil of an induction welder, opening a power supply for induction welding to perform induction brazing, flowing out liquid metal from a brazing seam, and stopping heating to obtain the copper-aluminum eutectic transition wire clamp. Wherein the temperature of the induction brazing is 540 ℃, and the time of the induction brazing is 15s.
Test example 1 Joint morphology testing
The microstructure morphology of the braze joint of the copper-aluminum eutectic transition wire clamp of the embodiment 1 and the copper-aluminum transition wire clamps of the comparative examples 1-2 is characterized by adopting a scanning electron microscope, and the joint composition is subjected to energy spectrum analysis.
The microscopic morphology of the joint structure of the copper-aluminum eutectic transition wire clamp of example 1 is shown in fig. 1. The pair of microscopic morphologies of the joint structures of the copper aluminum transition clamps of example 1 and comparative examples 1-2 are shown in fig. 2 (wherein fig. 2a is the microscopic morphology of the clamp joint of comparative example 1; fig. 2b is the microscopic morphology of the clamp joint of comparative example 2; and fig. 2c is the microscopic morphology of the clamp joint of example 1 of the present invention). The results of the spectral analysis of the different letter designation areas in fig. 2 are shown in table 1.
As can be seen from FIG. 1, the joint structure of the Cu-Al eutectic transition wire clamp of the embodiment 1 of the invention has a single phase, no easy-to-corrode phase, and a thinner CuAl layer except the Cu side of the base material 2 Besides the hard and brittle phases, other areas, namely the center of the braze joint of the joint and the aluminum side of the base metal are high-strength Cu-Al flaky eutectic, and the alloy does not contain large-area alpha-Al solid solution.
Table 1 results of the spectral analysis (atomic fraction,%)
As can be seen further from FIG. 2 and Table 1, comparative example 1 is a conventional induction braze, solderThe Zn98Al is used as the diffusion layer and the CuAl is arranged in the interface structure of the copper side of the joint brazed by adopting Zn98Al solder 2 A large amount of black alpha-Al and white eta-Zn. Comparative example 2 was also a conventional induction braze, with a braze of BAl67CuSi, and a copper-side interface structure in the joint of comparative example 2 had coarse CuAl 2 And a larger amount of black alpha-Al phase. Whereas the copper side interface structure of the braze joint of example 1 of the present invention has only one layer of CuAl 2 And a large number of compact and fine lamellar Cu-Al eutectic crystals, and no other elements are introduced.
Test example 2 Joint Performance test
This test example examined the performance of braze joints of the copper-aluminum eutectic transition clamps of examples 1-5 of the present invention and the copper-aluminum transition clamps of comparative examples 1-2. The specific operation is as follows: the wire clamp joints of examples 1-5 and comparative examples 1-2 are taken as study objects, 10 standard tensile shear test pieces are cut out from each joint by wire cutting, the shear strength of each joint is tested firstly, the test method of the joint strength is carried out by referring to standard GB/T11363-2008, and 5 joints are tested to obtain the average value. And immersing 5 samples of each joint in 3.5% sodium chloride brine for room temperature immersion experiments, observing corrosion morphology after 60 days of immersion, testing joint shear strength and joint strength loss rate after corrosion, and judging the corrosion degree. The results of the shear strength before and after joint corrosion and the joint strength loss rate are shown in table 2.
Table 2 change in shear strength of copper-aluminum transition wire clamp joint
As can be seen from Table 2, compared with comparative examples 1-2, the joint strength of the copper-aluminum eutectic transition wire clamps of examples 1-5 of the present invention reaches 47-60 MPa, and the joint loss rate after corrosion test is only 8-11%, thus the copper-aluminum eutectic transition wire clamps of the present invention have high joint strength and good corrosion resistance. This is because: the joint structure of the embodiment of the invention is single, has no easy-to-corrode phase, and is mostly a high-strength eutectic structure. Whereas comparative example 1 is a conventional induction braze, the braze was Zn98Al, and zn—al eutectic and a large amount of Al solid solution were present in the braze joint structure, resulting in a joint structure that is not corrosion-resistant and has low strength. Comparative example 2 is also a conventional induction braze, braze BAl67CuSi, where there is a large amount of black solid solution of Al in the braze structure, which makes the joint weak and also not corrosion resistant.
From the above, the copper-aluminum eutectic transition wire clamp provided by the invention has a single phase of a joint structure and only contains Cu-Al eutectic and CuAl 2 Brittle phase, high joint strength and good corrosion resistance; in addition, in the preparation process of the copper-aluminum eutectic transition wire clamp, brazing filler metal is not needed, and NH is carried out under the protection of a solid medium 4 NH generated by OH 3 The method is simple, and has great popularization value in the application field of high-performance copper-aluminum wire clamps.
Claims (6)
1. The copper-aluminum eutectic transition wire clamp is characterized by comprising base metal copper and base metal aluminum, wherein a joint structure between the base metal copper and the base metal aluminum is formed by Cu-Al eutectic and CuAl 2 Brittle phase composition; the CuAl 2 The brittle phase is distributed on the copper side of the base metal, and the Cu-Al eutectic is distributed on the center of a braze joint of the joint and the aluminum side of the base metal; the aluminum side of the base material is free of aluminum-based solid solution.
2. The method for preparing the copper-aluminum eutectic transition wire clamp according to claim 1, which is characterized by comprising the following steps:
(1) Coating a connecting agent on the surface to be welded of the copper plate; the connecting agent consists of the following components in parts by mass: NH (NH) 4 OH 50-75 parts, csF-AlF 3 5-20 parts of absolute ethyl alcohol and 5-10 parts of absolute ethyl alcohol;
(2) Attaching and fixing the surface to be welded of the aluminum plate and the surface to be welded of the copper plate coated with the connecting agent, and then applying pressure to perform induction brazing to obtain a copper-aluminum eutectic transition wire clamp;
in the step (2), the pressure is applied to be 0.5-2.0 MPa; the temperature of the induction brazing is 540-560 ℃, and the time of the induction brazing is 15-20 s.
3. The method for preparing the copper-aluminum eutectic transition wire clamp according to claim 2, wherein oil stains and oxide films on surfaces to be welded of the copper plate and the aluminum plate are removed in advance before welding.
4. The method for manufacturing the copper-aluminum eutectic transition wire clamp according to claim 2, wherein in the step (1), the coating thickness of the connecting agent is 5-10 μm.
5. The method for preparing the copper-aluminum eutectic transition wire clamp according to claim 4, wherein the coating thickness of the connecting agent is 7-10 μm; the connecting agent consists of the following components in parts by mass: NH (NH) 4 OH 60-70 parts, csF-AlF 3 12-20 parts of absolute ethyl alcohol and 8-10 parts of absolute ethyl alcohol.
6. The method for preparing the copper-aluminum eutectic transition wire clamp according to claim 2, wherein the connecting agent is NH 4 OH、CsF-AlF 3 The absolute ethyl alcohol is stirred into paste according to the mass parts and then used.
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