High-strength high-conductivity copper-tin alloy wire resistant to high-temperature softening and a preparation process thereof

Abstract

The application discloses a high-strength and high-conductivity copper-tin alloy wire capable of resisting high-temperature softening and a preparation process thereof, and the copper-tin alloy wire comprises the following raw materials in percentage by mass: Sn 0.25-0.35 wt.%; Zr 0.15-0.35 wt.%, and the balance of Cu and inevitable impurities. The Cu-Sn-Zr alloy wire has a tensile strength of more than 700 MPa, an electrical conductivity of more than 75% IACS, and a softening resistance temperature of more than 400 DEG C, and can meet the use requirements of the high-strength and high-conductivity Cu-Sn alloy wire at high temperature. After deformation heat treatment of the alloy rod is completed, the alloy rod is subjected to gradual cooling treatment through a special gradual cooling device, so that problems such as thermal cracks in the cooling process are avoided, and the quality of the alloy rod product is ensured.

Description

Technical Field

[0001] This invention relates to the field of copper alloy materials with high strength, high conductivity and high resistance to softening temperature, specifically to a high-strength, high-conductivity copper-tin alloy wire resistant to high-temperature softening and its preparation process. Background Technology

[0002] Cu-Sn alloy wires, with their excellent strength, electrical conductivity, thermal conductivity, and wear resistance, have been widely used in various fields such as electronics, transportation, and medical devices. With the booming development of high-tech industries, the miniaturization and micro-miniaturization of equipment has become an inevitable trend. This trend not only requires Cu-Sn alloy wires to possess excellent mechanical and electrical properties but also places more stringent standards on their resistance to high-temperature softening. Currently, several technologies have explored this area. For example, CN1844837A discloses a Cu-Sn-Cr-P alloy for ultra-thin automotive radiator strips, with a softening temperature as high as 400℃ and a conductivity of 89% IACS. However... The tensile strength only reaches 410MPa. Another technology, CN101709402A, discloses an ultra-thin Cu-Sn-Te-P alloy strip for automotive radiators with a conductivity exceeding 85% IACS and a softening temperature exceeding 400℃. However, its tensile strength is only between 395MPa and 450MPa. In addition, CN116103537A introduces a multi-element copper-tin alloy wire blank that can be drawn into ultra-fine wires and its manufacturing method. This alloy has a high conductivity (>85% IACS) and a tensile strength of 550MPa-590MPa in the hard state, but its softening temperature is relatively low, not exceeding 290℃.

[0003] However, existing Cu-Sn alloy wires suffer from the following problems during production and processing: While maintaining high electrical conductivity, there is a contradictory relationship between the strength and softening temperature of Cu-Sn alloys; increasing the strength often leads to a corresponding decrease in the softening temperature. Therefore, how to further improve the high-temperature softening resistance of Cu-Sn alloy wires while ensuring high strength and conductivity has become a key issue that urgently needs in-depth research and resolution in the field of Cu-Sn alloy materials. Summary of the Invention

[0004] The purpose of this invention is to provide a high-strength, high-conductivity copper-tin alloy wire resistant to high-temperature softening and its preparation process, which solves the technical problem that there is a contradictory relationship between the strength and softening temperature of Cu-Sn alloy while maintaining high electrical conductivity. When the strength of Cu-Sn alloy is increased, its softening temperature often decreases accordingly.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-strength, high-conductivity copper-tin alloy wire resistant to high-temperature softening, comprising the following raw materials in the following mass fraction: Sn 0.25wt.%-0.35wt.%; Zr 0.15wt.%-0.35wt.%, with the balance being Cu and unavoidable impurities.

[0006] In a preferred embodiment of the present invention, the alloy wire has a tensile strength greater than 700 MPa when the diameter is 0.6 mm, preferably greater than 720 MPa, more preferably greater than 750 MPa, and the tensile strength is preferably less than 800 MPa, more preferably less than 780 MPa.

[0007] In a preferred embodiment of the present invention, the conductivity of the alloy wire at a diameter of 0.6 mm is greater than 75% IACS, preferably greater than 75.8% IACS, more preferably greater than 76.4% IACS, and the conductivity is preferably less than 80% IACS, more preferably less than 78% IACS.

[0008] In a preferred embodiment of the present invention, the alloy wire has a softening resistance temperature of greater than 400°C, preferably greater than 420°C, and more preferably greater than 450°C when the diameter is 0.6 mm, and the conductivity is preferably less than 500°C, and more preferably less than 480°C.

[0009] As a preferred embodiment of the present invention, the following steps are included:

[0010] Step (1): Vacuum melting and casting process: Prepare the alloy wire according to the above alloy wire mass ratio requirements, mix the alloy materials and put them into the vacuum induction furnace, then close the chamber door, evacuate to below 10Pa, then fill with argon gas, and after all the raw materials have melted, keep them at 1250℃-1300℃ for 5min-8min under argon atmosphere protection, then cool them down to 1150℃-1200℃ and pour them into a Φ20mm×Φ300mm high-purity graphite mold. After cooling, take out the casting rod and mill it to Φ18.0mm to facilitate subsequent processing and heat treatment;

[0011] Step (2): Deformation heat treatment: The Cu-Sn-Zr alloy billet with a diameter of 18mm is subjected to deformation heat treatment. The specific process steps are as follows: solution treatment, large drawing, first-stage aging, medium drawing, second-stage aging and small drawing.

[0012] Step (3): Alloy rod cooling treatment: The alloy rod after deformation heat treatment is introduced into a gradual cooling device for gradual cooling treatment. The gradual cooling device includes a roller conveyor, a segmented heating hood, a gradual cooling component, and a spray protection device. The segmented heating hood is installed on the roller conveyor. Several sets of partitions are provided inside the segmented heating hood, and a cooling sub-cavity is formed between two adjacent sets of partitions. The gradual cooling component includes a refrigerator, a gas supply pipe, a distribution pipe, and electric heating wires. The gas outlet of the refrigerator is connected to the gas supply pipe. The gas supply pipe is transversely inserted into the segmented heating hood. Several sets of distribution pipes are evenly installed at the bottom of the gas supply pipe. The distribution pipes are located in the cooling sub-cavities. Several sets of electric heating wires are evenly distributed in several distribution pipes. The spray protection device is installed at the front end of the segmented heating hood and includes an inlet pipe, a liquid storage container, a pump body, a liquid supply pipe, and a liquid guide ring. The system comprises a nozzle, an infrared sensor, and a controller. The inlet pipe is installed at the end of a segmented heating hood. The liquid storage container is located on one side of the inlet pipe and its upper end is connected to the pump body. The liquid storage end of the pump body is connected to a liquid guide ring via a delivery pipe. The liquid guide ring is installed on the inlet pipe. Several groups of nozzles are evenly distributed in a ring shape inside the liquid guide ring. The infrared sensor is installed inside the inlet pipe and connected to the controller via wiring. The controller is connected to the pump body via wiring. When the alloy rod needs to be cooled, the alloy rod is introduced into the inlet pipe. The infrared sensor detects the rod and transmits the signal to the controller. The controller controls the pump body to operate. The pump body draws out the anti-oxidation coating located inside the liquid storage container and introduces it into the liquid guide ring. The coating is then evenly sprayed onto the surface of the alloy rod through the nozzles. Applying an anti-oxidation coating to the alloy surface can reduce the occurrence of oxidation reactions and prevent the formation of oxides during heat treatment, thereby reducing the generation of hot cracks.

[0013] In a preferred embodiment of the present invention, Sn is added in the form of pure metal and Zr is added in the form of Cu-40wt.% master alloy in step (1).

[0014] As a preferred embodiment of the present invention, in step (2), the solution treatment process is 950℃×1h, the first-stage aging process is 350℃×1h, and the second-stage aging process is 400℃×1h.

[0015] As a preferred embodiment of the present invention, in step (2), the drawing speed in the large drawing stage is 100m / min-150m / min, the drawing speed in the medium drawing stage is 200m / min-400m / min, and the drawing speed in the small drawing stage is 300m / min-500m / min.

[0016] In a preferred embodiment of the present invention, in step (2), the large drawing deformation is performed by drawing the material from an initial diameter of 18.0 mm to a diameter of 4.0 mm in multiple passes, with a deformation amount of 15%-20% per pass; the medium drawing deformation is performed by drawing the material from a diameter of 4.0 mm to a diameter of 1.0 mm in multiple passes, with a deformation amount of 10%-15% per pass; and the small drawing deformation is performed by drawing the material from a diameter of 1.0 mm to a diameter of 0.6 mm in multiple passes, with a deformation amount of 5%-10% per pass.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. This invention departs from the traditional framework of Cu-Sn alloys as solid-solution-strengthened and work-hardening alloys in its composition design. Instead, it focuses on age-hardening by adding 0.15-0.35 wt.% Zr. After deformation heat treatment, the addition of Zr generates a large number of nanoscale Zr-rich phases in the Cu-Sn alloy matrix, significantly improving its tensile strength. During aging, Sn atoms in the solid-solution state in the alloy matrix segregate on the surface of the nanoscale Zr-rich phase, forming a core-shell structure with the Zr-rich phase as the core and the Sn atom segregation layer as the shell. This, to a certain extent... Adding Zr can reduce the number of Sn atoms in the matrix, thereby reducing the influence of Sn atoms on electron scattering, ultimately resulting in a high conductivity of the alloy. The addition of Zr can generate primary micron-sized Zr-rich phases and nano-sized aged Zr-rich phases in the alloy matrix. These two Zr-rich phases of different sizes are distributed on the grain boundaries and inside the grains, respectively. They can hinder grain boundary movement and dislocation recovery recrystallization under high temperature conditions, which significantly improves the alloy's softening resistance temperature. The addition of Zr effectively solves the contradiction between the strength, conductivity and high-temperature softening resistance of high-strength and high-conductivity Cu-Sn alloys.

[0019] 2. After the alloy rod undergoes deformation heat treatment, this method uses a specialized gradual cooling device to perform gradual cooling treatment on the alloy rod, avoiding problems such as hot cracking during the cooling process and ensuring the quality of the finished alloy rod. Attached Figure Description

[0020] Figure 1 The figures show experimental data of wires in Examples 1-3 and Comparative Example 1 of the present invention.

[0021] Figure 2 This is a structural diagram of the gradual cooling device described in this invention;

[0022] Figure 3 This is a structural diagram of the roller conveyor described in this invention;

[0023] Figure 4 This is a structural diagram of the gas pipeline described in this invention;

[0024] Figure 5 This is a cross-sectional view of the liquid guiding ring described in this invention.

[0025] In the diagram: 1. Roller conveyor; 2. Baffle plate; 3. Cooling chamber; 4. Refrigeration unit; 5. Gas delivery pipe; 6. Diverter pipe; 7. Electric heating wire; 8. Inlet pipe; 9. Liquid storage container; 10. Pump body; 11. Liquid delivery pipe; 12. Liquid guide ring; 13. Nozzle; 14. Infrared sensor; 15. Controller. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1

[0028] A high-strength, high-conductivity copper-tin alloy wire resistant to high-temperature softening and its preparation method are disclosed. The alloy wire comprises Cu, Sn, Zr elements and unavoidable impurities, with the following mass percentages of each element:

[0029] Sn: 0.3 wt.%;

[0030] Zr: 0.15 wt.%;

[0031] The total mass of unavoidable impurities is 0.03%, with the balance being copper.

[0032] Specifically, Sn is added in the form of pure metal, and Zr is added in the form of Cu-40wt.%Zr master alloy.

[0033] The preparation method of the above-mentioned Cu-Sn-Zr composite wire includes the following steps:

[0034] (1) Vacuum melting and casting process: The materials are batched according to requirements, and the alloy materials are mixed and placed in a vacuum induction furnace. Then the furnace door is closed, and the vacuum is drawn to below 10Pa. Argon is then introduced. After all the raw materials are melted, the furnace is kept at ~1250℃ for ~5min under the protection of argon atmosphere. Then the furnace is cooled to ~1150℃ and poured into a Φ20mm×300mm high-purity graphite mold. After it cools down, the casting rod is taken out and milled to Φ18.0mm to facilitate subsequent processing and heat treatment.

[0035] (2) Deformation heat treatment: The deformation heat treatment process for Cu-Sn-Zr alloy billets with a diameter of 18mm is as follows: solution treatment - large drawing - first-stage aging - medium drawing - second-stage aging - small drawing. The heat treatment process is as follows: solution treatment at 950℃ for 1 hour, first-stage aging at 350℃ for 1 hour, and second-stage aging at 400℃ for 1 hour. The drawing deformation process is as follows: large drawing to a diameter of 4.0mm, drawing speed of 590m / min, and deformation per pass of 20%; medium drawing to a diameter of 1.0mm, drawing speed of 500m / min, and deformation per pass of 15%; small drawing to a diameter of 0.6mm, drawing speed of 390m / min, and deformation per pass of 10%.

[0036] (3) The tensile strength of Cu-0.3Sn-0.15Zr alloy wire with a diameter of 0.6mm was tested to be ~707MPa, the conductivity was ~75.8%IACS, and the softening temperature was ~403℃, which showed good comprehensive performance.

[0037] Example 2:

[0038] A high-strength, high-conductivity copper-tin alloy wire resistant to high-temperature softening and its preparation method are disclosed. The alloy wire comprises Cu, Sn, Zr elements and unavoidable impurities, with the following mass percentages of each element:

[0039] Sn: 0.29 wt.%;

[0040] Zr: 0.24 wt.%;

[0041] The total mass of unavoidable impurities is 0.03%, with the balance being Cu.

[0042] Specifically, Sn is added in the form of pure metal, and Zr is added in the form of Cu-40wt.%Zr master alloy.

[0043] The preparation method of the above-mentioned Cu-Sn-Zr composite wire includes the following steps:

[0044] (1) Vacuum melting and casting process: The materials are batched as required, and the alloy materials are mixed and placed in a vacuum induction furnace. Then the furnace door is closed, and the vacuum is drawn to below 10Pa. Argon is then introduced. After all the raw materials are melted, the furnace is kept at 1300℃ for 7 minutes under the protection of argon atmosphere. Then the temperature is lowered to 1200℃ and poured into a Φ20mm×300mm high-purity graphite mold. After it cools down, the casting rod is taken out and milled to Φ18.0mm to facilitate subsequent processing and heat treatment.

[0045] (2) Deformation heat treatment: The deformation heat treatment process for Cu-Sn-Zr alloy billets with a diameter of 18mm is as follows: solution treatment - large drawing - first-stage aging - medium drawing - second-stage aging - small drawing. Among them, the heat treatment process is: solution treatment at 950℃ for 1h, first-stage aging treatment at 350℃ for 1h, and second-stage aging treatment at 400℃ for 1h. The drawing deformation process is: large drawing to a diameter of 4.0mm, drawing speed at 520m / min, and deformation per pass of 18%; medium drawing to a diameter of 1.0mm, drawing speed at 430m / min, and deformation per pass of 12%; small drawing to a diameter of 0.6mm, drawing speed at 310m / min, and deformation per pass of 8%.

[0046] (3) The tested Cu-0.29Sn-0.24Zr alloy wire with a diameter of 0.6mm has a tensile strength of 724MPa, a conductivity of 76.8%IACS, and a softening temperature of 425℃, and has good comprehensive performance.

[0047] Example 3:

[0048] A high-strength, high-conductivity copper-tin alloy wire resistant to high-temperature softening and its preparation method are disclosed. The alloy wire comprises Cu, Sn, Zr elements and unavoidable impurities, with the following mass percentages of each element:

[0049] Sn: 0.25 wt.%;

[0050] Zr: 0.35 wt.%;

[0051] The total mass of unavoidable impurities is 0.03%, with the balance being Cu.

[0052] Specifically, Sn is added in the form of pure metal, and Zr is added in the form of Cu-40wt.%Zr master alloy.

[0053] The preparation method of the above-mentioned Cu-Sn-Zr composite wire includes the following steps:

[0054] (1) Vacuum melting and casting process: The materials are batched according to requirements, and the alloy materials are mixed and placed in a vacuum induction furnace. Then the chamber door is closed, and the vacuum is drawn to below 10Pa. Argon is then introduced. After all the raw materials are melted, the furnace is kept at 1350℃ for 8 minutes under the protection of argon atmosphere. Then the temperature is lowered to 1250℃ and poured into a Φ20mm×300mm high-purity graphite mold. After it cools down, the casting rod is taken out and milled to Φ18.0mm to facilitate subsequent processing and heat treatment.

[0055] (2) Deformation heat treatment: The deformation heat treatment process for Cu-Sn-Zr alloy billets with a diameter of 18mm is as follows: solution treatment - large drawing - first-stage aging - medium drawing - second-stage aging - small drawing. Among them, the heat treatment process is: solution treatment at 950℃ for 1h, first-stage aging treatment at 350℃ for 1h, and second-stage aging treatment at 400℃ for 1h. The drawing deformation process is: large drawing to a diameter of 4.0mm, drawing speed at 410m / min, and deformation per pass of 15%; medium drawing to a diameter of 1.0mm, drawing speed at 300m / min, and deformation per pass of 11%; small drawing to a diameter of 0.6mm, drawing speed at 210m / min, and deformation per pass of 5%.

[0056] (3) The tensile strength of Cu-0.25Sn-0.35Zr alloy wire with a diameter of 0.6mm was tested to be ~756MPa, the conductivity was ~76.4%IACS, and the softening temperature was ~460℃, which showed good comprehensive performance.

[0057] Comparative Example 1

[0058] The method of the present invention relates to the preparation of Cu-Sn alloy wire and the preparation method thereof. The alloy wire comprises Cu, Sn elements and unavoidable impurities, and the mass percentage of each element is as follows:

[0059] Sn: 0.3 wt.%;

[0060] The total mass of unavoidable impurities is 0.03%, with the balance being Cu.

[0061] Specifically, the Sn element is added in the form of a pure metal.

[0062] The preparation method of the above-mentioned Cu-Sn composite wire includes the following steps:

[0063] (1) Vacuum melting and casting process: The materials are batched according to requirements, and the alloy materials are mixed and placed in a vacuum induction furnace. Then the furnace door is closed, and the vacuum is drawn to below 10Pa. Argon is then introduced. After all the raw materials are melted, the furnace is kept at 1200℃ for 5 minutes under the protection of argon atmosphere. Then the temperature is lowered to 1150℃ and poured into a Φ20mm×300mm high-purity graphite mold. After it cools down, the casting rod is taken out and milled to Φ18.0mm to facilitate subsequent processing and heat treatment.

[0064] (2) Drawing deformation: Cu-Sn alloy billets with a diameter of 18mm were directly drawn without any heat treatment. The specific process steps were: large drawing - medium drawing - small drawing. Among them, the large drawing was to a diameter of 4.0mm, the drawing speed was 600m / min, and the deformation per pass was 20%; the medium drawing was to a diameter of 1.0mm, the drawing speed was 500m / min, and the deformation per pass was 15%; the small drawing was to a diameter of 0.6mm, the drawing speed was 400m / min, and the deformation per pass was 5%.

[0065] (3) The tensile strength of Cu-0.3Sn alloy wire with a diameter of 0.6mm was tested to be ~577MPa, the conductivity was ~76.1%IACS, and the softening temperature was ~330℃.

[0066] The tensile strength, conductivity, and softening temperature of the 0.6 mm diameter alloy wires in Examples 1-3 and Comparative Example 1 were summarized in Table 1 below. The results show that, compared with Cu-Sn binary alloy wires, the addition of Zr has little effect on the conductivity of Cu-Sn alloy wires, but its strength and softening temperature are significantly improved. Furthermore, when the alloy rod needs to be cooled, the designed gradient cooling device introduces the alloy rod through the inlet pipe 8. The infrared sensor 14 senses the rod and transmits the signal to the controller 15. The controller 15 controls the pump body 10 to operate. The pump body 10 draws out the anti-oxidation coating located inside the liquid storage container 9 and introduces it into the liquid guiding ring 12. The coating is then evenly sprayed onto the surface of the alloy rod through the nozzle 13. Coating the alloy surface with an anti-oxidation coating can reduce the occurrence of oxidation reactions and prevent the formation of oxides during heat treatment, thereby reducing the generation of hot cracks. In addition, the power of each heating wire 7 is different, with the heating wire 7 near the front having a higher power than the heating wire 7 at the rear. This design allows for gradient cooling during the alloy rod cooling process.

[0067] In the description of this invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," "both ends," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0068] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of those features.

[0069] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0070] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for producing a high-strength high-conductivity copper-tin alloy wire resistant to high-temperature softening, characterized by comprising: The high-strength and high-conductivity copper-tin alloy wire resistant to high-temperature softening comprises raw materials in the following mass percentages: Sn 0.25 wt.%; Zr 0.35 wt.%, and the balance of Cu and inevitable impurities; and the preparation method comprises the following steps: step (1): a vacuum melting and casting process: ingredients are prepared according to the mass ratio requirements of the alloy wire, the alloy materials are mixed and then placed in a vacuum induction furnace, then the door is closed, vacuum is drawn to below 10 Pa, then argon is filled, after the raw materials are completely melted, heat preservation is carried out at 1250-1300 DEG C for 5-8 min under the protection of argon atmosphere, then the temperature is lowered to 1150-1200 DEG C, and then the Φ20mm*Φ300mm high-purity graphite mold is poured into, after cooling, the cast bar is taken out, and the surface is milled to Φ18.0mm to facilitate subsequent processing and heat treatment; ​ Step (2): deformation heat treatment: the Cu-Sn-Zr alloy bar with a diameter of 18 mm is subjected to deformation heat treatment, and the specific process steps are in sequence: solid solution treatment, large-diameter drawing, primary aging, medium-diameter drawing, secondary aging and small-diameter drawing. Step (3): alloy rod cooling treatment: the alloy rod after the deformation heat treatment is introduced into a gradual cooling device for gradual cooling treatment, the gradual cooling device comprises a roller conveyor (1), a segmented heating cover, a gradual cooling assembly and a spraying protector, the segmented heating cover is installed on the roller conveyor (1), a plurality of groups of partitions (2) are arranged in the segmented heating cover, cooling sub-cavities (3) are formed between adjacent two groups of the partitions (2), the gradual cooling assembly comprises a refrigerating machine (4), a gas conveying pipe (5), a shunt pipe (6) and an electric heating wire (7), the gas outlet end of the refrigerating machine (4) is connected with the gas conveying pipe (5), the gas conveying pipe (5) is transversely inserted into the segmented heating cover, the shunt pipe (6) is divided into a plurality of groups and is uniformly installed at the bottom of the gas conveying pipe (5), the shunt pipe (6) is located in the cooling sub-cavity (3), the electric heating wire (7) is divided into a plurality of groups and is uniformly distributed in the plurality of groups of shunt pipes (6), the spraying protector is installed at the front end of the segmented heating cover and comprises an introduction pipe (8), a liquid storage container (9), a pump body (10), a liquid conveying pipe (11), a liquid guiding ring (12), a spray head (13), an infrared sensor (14) and a controller (15), the introduction pipe (8) is installed at the end of the segmented heating cover, the liquid storage container (9) is located at one side of the introduction pipe (8) and the upper end is connected with the pump body (10), the liquid storage end of the pump body (10) is connected with the liquid guiding ring (12) through the liquid conveying pipe (11), the liquid guiding ring (12) is installed on the introduction pipe (8), the spray head (13) is divided into a plurality of groups and is annularly and uniformly distributed on the inner side of the liquid guiding ring (12), the infrared sensor (14) is installed in the introduction pipe (8) and is connected with the controller (15) through a line, the controller (15) is connected with the pump body (10) through a line, when the alloy rod needs to be cooled, the alloy rod is introduced from the introduction pipe (8), the infrared sensor (14) senses and transmits signals to the controller (15), the controller (15) controls the pump body (10) to operate, the pump body (10) extracts the antioxidant coating in the liquid storage container (9) and introduces it into the liquid guiding ring (12), and uniformly sprays it on the surface of the alloy rod through the spray head (13), the antioxidant coating on the alloy surface can reduce the occurrence of oxidation reaction and prevent the formation of oxides in the heat treatment process, thereby reducing the generation of thermal cracks.

2. The method of claim 1, wherein the alloy wire has a tensile strength of 750 MPa or more at a diameter of 0.6 mm.

3. The method of claim 1, wherein the alloy wire has an electrical conductivity of more than 75% IACS at a diameter of 0.6 mm.

4. The method of claim 1, wherein the alloy wire has a softening resistance temperature of more than 450°C at a diameter of 0.6 mm.

5. The method of claim 1, wherein the Sn element is added in the form of pure metal and the Zr element is added in the form of a Cu-40wt.%Zr intermediate alloy in step (1).

6. The preparation method of claim 1, wherein the solution treatment process in step (2) is 950℃x1h, the first aging treatment process is 350℃x1h, and the second aging treatment process is 400℃x1h.

7. The preparation method of claim 1, wherein the drawing speed of the large-drawing stage in step (2) is 100m / min-150m / min, the drawing speed of the medium-drawing stage is 200m / min-400m / min, and the drawing speed of the small-drawing stage is 300m / min-500m / min.

8. The preparation method of claim 1, wherein the large-drawing deformation in step (2) is drawn from an initial diameter of 18.0mm to a diameter of 4.0mm in multiple passes with a pass deformation of 15%-20%, the medium-drawing deformation is drawn from a diameter of 4.0mm to a diameter of 1.0mm in multiple passes with a pass deformation of 10%-15%, and the small-drawing deformation is drawn from a diameter of 1.0mm to a diameter of 0.6mm in multiple passes with a pass deformation of 5%-10%.

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