High-strength tungsten alloy wire and preparation method and application thereof

Abstract

The invention relates to the technical field of silk-screen printing materials, in particular to a high-strength tungsten alloy wire and a preparation method and application thereof. The high-strength tungsten alloy wire comprises the following chemical components in percentage by mass: 3%-5% of Cu, 2%-3% of Ni, 2%-3% of Zr, 2%-4% of Re, 0.5%-0.8% of Si, 3%-6% of C and the balance of W and inevitable impurities. The high-strength tungsten alloy wire has good toughness and high tensile strength and elasticity, can meet the high-precision printing requirement of silk-screen printing, and effectively solves the technical problems that in the prior art, a silk-screen material for printing a solar cell is poor in toughness, mechanical strength and elasticity, and the printing precision is poor. And a new material and a new idea are provided for preparation of the printing silk screen.

Description

Technical Field

[0001] The invention relates to the technical field of screen printing materials, and in particular to a high-strength tungsten alloy wire and a preparation method and application thereof. Background Art

[0002] As the global demand for clean energy continues to grow, solar energy has attracted much attention as a sustainable and pollution-free form of energy. Traditional silicon-based solar cells have dominated the past few decades, but they have limitations such as high cost and complex production processes. The emergence of printed solar cell technology has brought new vitality to the field of solar energy. It uses a printing process to deposit active materials on a substrate to form a cell structure, which is expected to achieve low-cost, high-efficiency and large-area solar energy conversion. Printed solar cells are mainly based on the principle of the photoelectric effect. When photons irradiate the active layer of the cell, the energy of the photons is absorbed, causing the electrons in the active layer to jump from the valence band to the conduction band, generating electron-hole pairs. Under the action of the electric field inside the cell, the electrons and holes move in opposite directions of the electrodes, thereby forming an electric current.

[0003] Screen printing is the main means of producing printed solar cells, and its printing quality directly affects the performance of the battery. The screen used in screen printing usually uses stainless steel screen or nylon screen. The stainless steel screen has high strength, strong stability, long service life, can be made thinner, and the spacing between wires is large under the same mesh number, which is conducive to fine line printing; it is opaque, which can reduce the root cutting phenomenon. However, the elastic coefficient of the stainless steel screen is large but the tensile limit is small, which is easily damaged by stamping and prone to sudden breakage. Although the elasticity of the nylon screen is good, it is easy to stretch and deform the printed image, and the image size and positioning control is poor. It is not suitable for high-viscosity slurry, there is a shrinkage problem, and it will deform in a humid environment and when the temperature changes. There are also reports of using polyester screens. This polyester screen has good flexibility and can be printed on substrates with poor flatness. It has good elasticity, and the image positioning and clarity can meet most thick film printing requirements, and the production efficiency is high. However, this polyester screen has low physical stability and is difficult to meet the requirements of high-precision printing scenarios.

[0004] Based on this, developing a screen material that can meet the needs of various printing scenarios and has excellent mechanical properties is of great practical significance for the preparation of printed solar cells. Summary of the invention

[0005] In view of the problem that the screen material of the printed solar cell in the prior art has poor toughness, mechanical strength and elasticity, and is difficult to meet the high-precision printing requirements, the present invention provides a high-strength tungsten alloy wire and its preparation method and application. The high-strength tungsten alloy wire not only has good toughness, but also has high mechanical strength and elasticity, and has a thinner diameter, which can meet the high-precision printing requirements of the printed screen, and provides a new material and idea for the preparation of the printed screen.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions: A first aspect of the present invention provides a high-strength tungsten alloy wire, wherein the raw material of the high-strength tungsten alloy wire comprises the following chemical components in percentage by mass: Cu: 3%-5%, Ni: 2%-3%, Zr: 2%-3%, Re: 2%-4%, Si: 0.5%-0.8%, C: 3%-6% and the remainder of W and unavoidable impurities.

[0007] The present invention uses tungsten as the main alloy raw material, and combines metals such as copper, nickel, zirconium and rhenium, as well as non-metallic materials such as silicon and carbon to produce the high-strength tungsten alloy wire. Tungsten alloy wire has extremely high tensile strength, can withstand large pulling force and tension during the printing process, is not easy to deform and break, can ensure the dimensional stability of the printing screen, and thus improve printing accuracy. In addition, the tungsten alloy wire has a high hardness, and when it is applied to the printing screen, it has less wear, can significantly increase the service life of the printing screen, and reduce production costs. More importantly, the tungsten alloy wire has a low elongation, which can better maintain the shape and tension uniformity of the printing screen, make the edges of the printed graphics clearer and more accurate, and improve the printing quality.

[0008] The addition of copper can effectively reduce the hardness of tungsten alloy, making it easier to draw wires and reducing the probability of tungsten alloy wire breakage; copper can also improve the toughness and brittleness of tungsten alloy wire, avoiding brittle fracture of tungsten alloy wire when stretched by external force, and increasing the reliability of alloy wire during use. Nickel has a certain antioxidant ability and can form a dense protective film on the surface of tungsten alloy wire, which can effectively extend the service life of tungsten alloy wire at high temperatures. The addition of zirconium can refine the grains of tungsten alloy, making the grain size of tungsten alloy wire smaller and the structure more uniform and dense, thereby improving the strength and toughness of tungsten alloy wire. Rhenium can improve the high temperature strength and creep resistance of tungsten alloy wire, so that tungsten alloy wire can resist slow deformation caused by continuous stress at high temperature, and ensure the structural integrity of tungsten alloy wire. A small amount of silicon can improve the high temperature strength and recrystallization temperature of tungsten alloy wire, so that it can still maintain good mechanical properties in high temperature environment and extend its service life.

[0009] In summary, the high-strength tungsten alloy wire provided by the present invention not only has good toughness and mechanical strength, but also has excellent thermal stability, can maintain structural integrity in a high temperature environment, has good performance, is not easy to wear, has a long service life, and can meet a variety of high-precision printing requirements. The high-strength tungsten alloy wire of the present invention effectively solves the problem that the screen material toughness, mechanical strength and elasticity of printed solar cells in the prior art are poor and difficult to meet the requirements of high-precision printing, and provides a new idea for the preparation of printed screens.

[0010] Preferably, the diameter of the high-strength tungsten alloy wire is 10 μm-13 μm.

[0011] Tungsten alloy wires with fine diameters can weave finer meshes, making printed patterns clearer and more precise. However, as the diameter decreases, the toughness of the tungsten alloy wire decreases, and the effects of internal defects and surface roughness on the strength of the tungsten alloy wire increase, resulting in increased strength discreteness, which has an adverse effect on the overall strength of the tungsten alloy wire. Based on this, the present invention limits the diameter of the high-strength tungsten alloy wire to 10μm-13μm, ensuring that the toughness and strength of the tungsten alloy wire are balanced, improving its use accuracy, and ensuring the cost and simplicity of processing technology.

[0012] The second aspect of the present invention provides a method for preparing the high-strength tungsten alloy wire, comprising the following steps: Step 1, mixing copper source, nickel source, zirconium source, rhenium source, silicon source, carbon source and tungsten source uniformly, and high-speed ball milling to obtain a metal mixture; Step 2: cold-press the metal mixture under an inert atmosphere, heat it to 1600° C.-1700° C. for primary sintering, and cool it to obtain a metal blank; cold-press the metal blank for a secondary time, heat it to 2000° C.-2500° C. for secondary sintering, and obtain a metal sintered blank; Step 3, subjecting the metal sintered blank to a rotary forging process and then an annealing process to obtain a first rod; subjecting the first rod to a drawing process to obtain a first rod; Step 4: performing secondary rotary forging, secondary annealing and secondary drawing on the first rod in sequence to obtain a second rod; Step 5: Drawing the second rod to obtain high-strength tungsten alloy wire.

[0013] Preferably, in step 1, the copper source is copper powder.

[0014] Preferably, in step 1, the nickel source is nickel powder.

[0015] Preferably, in step 1, the zirconium source is zirconium carbide.

[0016] Preferably, in step 1, the rhenium source is rhenium carbide.

[0017] Preferably, in step one, the silicon source is single crystal silicon or silicon carbide.

[0018] Preferably, in step 1, the tungsten source is high-purity tungsten powder.

[0019] Preferably, in step 1, the rotation speed of the high-speed ball mill is 4000rpm-5000rpm, and the time of the high-speed ball mill is 3h-5h.

[0020] Preferably, in step 2, the pressure of the cold press molding is 180MPa-260MPa, and the holding time of the cold press molding is 120s-180s.

[0021] Preferably, in step 2, the temperature is raised to 1600°C-1700°C by programmed heating, and the heating rate is 15°C / min-20°C / min.

[0022] Preferably, in step 2, the temperature is raised to 2000°C-2500°C by programmed temperature increase, with a heating rate of 20°C / min-25°C / min.

[0023] Preferably, in step 2, the holding time of the primary sintering is 3h-5h.

[0024] Preferably, in step 2, the holding time of the secondary sintering is 4h-6h.

[0025] Preferably, in step three, the forging temperature of the single rotary forging is 2000° C.-2100° C., and the forging time of the single rotary forging is 5 min-8 min.

[0026] Preferably, in step three, the temperature of the primary annealing treatment is 1600° C.-1700° C., and the holding time of the primary annealing treatment is 15 min-25 min.

[0027] Preferably, in step 4, the forging temperature of the secondary rotary forging treatment is 1600° C.-1800° C., and the forging time of the secondary rotary forging treatment is 4 min-6 min.

[0028] Preferably, in step 4, the temperature of the secondary annealing treatment is 1200° C.-1300° C., and the holding time of the secondary annealing treatment is 10 min-15 min.

[0029] Preferably, the specification of the first rod is Φ10mm-Φ15mm.

[0030] Preferably, the specification of the second rod is Φ4mm-Φ6mm.

[0031] A third aspect of the present invention provides an application of the high-strength tungsten alloy wire in preparing a printing screen.

[0032] In summary, the present invention provides a high-strength tungsten alloy wire and its preparation method and application. The tungsten powder is modified by doping with metals such as copper, nickel, zirconium and rhenium and two non-metals such as silicon and carbon. The obtained tungsten alloy wire not only has good toughness and mechanical strength, but also has excellent elasticity and stability, is not easy to wear, has a long service life, and can meet the needs of high-precision printing. The technical solution of the present invention effectively solves the problem that the toughness, mechanical strength and elasticity of the screen material for printing solar cells in the prior art are poor and it is difficult to meet the needs of high-precision printing, and provides a new idea for the preparation of printing screen materials. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example 1 This embodiment provides a high-strength tungsten alloy wire and a preparation method thereof, which specifically includes the following contents: The high-strength tungsten alloy wire includes the following chemical components in percentage by mass: Cu: 4.2%, Ni: 2.3%, Zr: 2.1%, Re: 2.8%, Si: 0.6%, C: 3.9% and 84.3% W.

[0035] Step 1: Weigh copper powder, nickel powder, zirconium carbide, rhenium carbide, single crystal silicon and high-purity tungsten powder according to the designed ratio, mix them evenly, and perform high-speed ball milling at a speed of 4500 rpm for 4 hours to obtain a metal mixture; Step 2: In an inert atmosphere, the metal mixture is cold pressed at a pressure of 240 MPa, the pressure is maintained for 140 seconds, the pressed mixture blank is heated to 1650°C at a heating rate of 15°C / min for primary sintering, the temperature is maintained for 4 hours, and the blank is cooled to room temperature to obtain a metal blank; the metal blank is cold pressed for a second time at a pressure of 220 MPa, the pressure is maintained for 140 seconds, the pressed blank is heated to 2200°C at a heating rate of 22°C / min for secondary sintering, and the temperature is maintained for 5 hours to obtain a metal sintered blank; Step 3: subjecting the metal sintered blank to rotary forging at 2050° C., keeping the temperature for 6 minutes, cooling the temperature to 1650° C., and performing an annealing treatment for 20 minutes to obtain a first rod; subjecting the first rod to drawing to obtain a rod with a specification of Φ15 mm; Step 4, heating the rod with a specification of Φ15 mm to 1700° C. for secondary rotary forging, keeping the temperature for 5 minutes, then cooling to 1250° C. for secondary annealing, keeping the temperature for 12 minutes, and performing secondary drawing on the rod after the secondary annealing to obtain a rod with a specification of Φ5 mm; Step 5: Wire drawing is performed on the rod with a specification of Φ5mm to obtain a high-strength tungsten alloy wire with a diameter of 11μm.

[0036] Example 2 This embodiment provides a high-strength tungsten alloy wire and a preparation method thereof, which specifically includes the following contents: The high-strength tungsten alloy wire includes the following chemical components in percentage by mass: Cu: 3.6%, Ni: 2.7%, Zr: 2.4%, Re: 3.1%, Si: 0.5%, C: 5.5% and 84.3% W.

[0037] Step 1: Weigh copper powder, nickel powder, zirconium carbide, rhenium carbide, silicon carbide and high-purity tungsten powder according to the designed ratio, mix them evenly, and perform high-speed ball milling at a speed of 4000 rpm for 5 hours to obtain a metal mixture; Step 2: In an inert atmosphere, the metal mixture is cold-pressed at a pressure of 260 MPa, the pressure is maintained for 120 seconds, the pressed mixture blank is heated to 1600°C at a heating rate of 16°C / min for primary sintering, the temperature is maintained for 5 hours, and the blank is cooled to room temperature to obtain a metal blank; the metal blank is cold-pressed for a second time at a pressure of 240 MPa, the pressure is maintained for 120 seconds, the pressed blank is heated to 2500°C at a heating rate of 25°C / min for secondary sintering, and the temperature is maintained for 4 hours to obtain a metal sintered blank; Step 3: subjecting the metal sintered blank to rotary forging at 2100° C., keeping the temperature for 5 minutes, cooling the temperature to 1600° C., and performing an annealing treatment for 25 minutes to obtain a first rod; subjecting the first rod to drawing to obtain a rod with a specification of Φ12 mm; Step 4, heating the rod with a specification of Φ12 mm to 1700° C. for secondary rotary forging, keeping the temperature for 6 minutes, then cooling to 1300° C. for secondary annealing, keeping the temperature for 10 minutes, and performing secondary drawing on the rod after the secondary annealing to obtain a rod with a specification of Φ4.7 mm; Step 5: Drawing the rod with a specification of Φ4.7 mm to obtain a high-strength tungsten alloy wire with a diameter of 12 μm.

[0038] Example 3 This embodiment provides a high-strength tungsten alloy wire and a preparation method thereof, which specifically includes the following contents: The high-strength tungsten alloy wire includes the following chemical components in percentage by mass: Cu: 4.2%, Ni: 2.3%, Zr: 2.1%, Re: 2.8%, Si: 0.6%, C: 3.7% and 84.3% W.

[0039] Step 1: Weigh copper powder, nickel powder, zirconium carbide, rhenium carbide, single crystal silicon and high-purity tungsten powder according to the designed ratio, mix them evenly, and perform high-speed ball milling at a speed of 4500 rpm for 4 hours to obtain a metal mixture; Step 2: In an inert atmosphere, the metal mixture is cold pressed at a pressure of 240 MPa, the pressure is maintained for 140 seconds, the pressed mixture blank is heated to 1650°C at a heating rate of 15°C / min for primary sintering, the temperature is maintained for 4 hours, and the blank is cooled to room temperature to obtain a metal blank; the metal blank is cold pressed for a second time at a pressure of 220 MPa, the pressure is maintained for 140 seconds, the pressed blank is heated to 2200°C at a heating rate of 22°C / min for secondary sintering, and the temperature is maintained for 5 hours to obtain a metal sintered blank; Step 3: subjecting the metal sintered blank to rotary forging at 2050° C., keeping the temperature for 6 minutes, cooling the temperature to 1650° C., and performing an annealing treatment for 20 minutes to obtain a first rod; subjecting the first rod to drawing to obtain a rod with a specification of Φ15 mm; Step 4, heating the rod with a specification of Φ15 mm to 1700° C. for secondary rotary forging, keeping the temperature for 5 minutes, then cooling to 1250° C. for secondary annealing, keeping the temperature for 12 minutes, and performing secondary drawing on the rod after the secondary annealing to obtain a rod with a specification of Φ5 mm; Step 5: Wire drawing is performed on the rod with a specification of Φ5mm to obtain a high-strength tungsten alloy wire with a diameter of 12.4μm.

[0040] Comparative Example 1 This comparative example provides a high-strength tungsten alloy wire and a preparation method thereof, which is different from Example 1 in that the high-strength tungsten alloy wire does not contain copper elements, and specifically includes the following contents: The high-strength tungsten alloy wire includes the following chemical components in percentage by mass: Ni: 2.3%, Zr: 2.1%, Re: 2.8%, Si: 0.6%, C: 3.7% and 88.5% W.

[0041] Step 1: Weigh copper powder, nickel powder, zirconium carbide, rhenium carbide, single crystal silicon and high-purity tungsten powder according to the designed ratio, mix them evenly, and perform high-speed ball milling at a speed of 4500 rpm for 4 hours to obtain a metal mixture; Step 2: In an inert atmosphere, the metal mixture is cold pressed at a pressure of 240 MPa, the pressure is maintained for 140 seconds, the pressed mixture blank is heated to 1650°C at a heating rate of 15°C / min for primary sintering, the temperature is maintained for 4 hours, and the blank is cooled to room temperature to obtain a metal blank; the metal blank is cold pressed for a second time at a pressure of 220 MPa, the pressure is maintained for 140 seconds, the pressed blank is heated to 2200°C at a heating rate of 22°C / min for secondary sintering, and the temperature is maintained for 5 hours to obtain a metal sintered blank; Step 3: subjecting the metal sintered blank to rotary forging at 2050° C., keeping the temperature for 6 minutes, cooling the temperature to 1650° C., and performing an annealing treatment for 20 minutes to obtain a first rod; subjecting the first rod to drawing to obtain a rod with a specification of Φ15 mm; Step 4, heating the rod with a specification of Φ15 mm to 1700° C. for secondary rotary forging, keeping the temperature for 5 minutes, then cooling to 1250° C. for secondary annealing, keeping the temperature for 12 minutes, and performing secondary drawing on the rod after the secondary annealing to obtain a rod with a specification of Φ5 mm; Step 5: Draw the Φ5mm rod to obtain high-strength tungsten alloy wire.

[0042] Comparative Example 2 This comparative example provides a high-strength tungsten alloy wire and a preparation method thereof, which is different from Example 1 in that Re in the high-strength tungsten alloy wire is replaced with an equal amount of La, specifically including the following contents: The high-strength tungsten alloy wire includes the following chemical components in percentage by mass: Cu: 4.2%, Ni: 2.3%, Zr: 2.1%, La: 2.8%, Si: 0.6%, C: 3.9% and 84.3% W.

[0043] Step 1: Weigh copper powder, nickel powder, zirconium carbide, lanthanum carbide, single crystal silicon and high-purity tungsten powder according to the designed ratio, mix them evenly, and perform high-speed ball milling at a speed of 4500 rpm for 4 hours to obtain a metal mixture; Step 2: In an inert atmosphere, the metal mixture is cold pressed at a pressure of 240 MPa, the pressure is maintained for 140 seconds, the pressed mixture blank is heated to 1650°C at a heating rate of 15°C / min for primary sintering, the temperature is maintained for 4 hours, and the blank is cooled to room temperature to obtain a metal blank; the metal blank is cold pressed for a second time at a pressure of 220 MPa, the pressure is maintained for 140 seconds, the pressed blank is heated to 2200°C at a heating rate of 22°C / min for secondary sintering, and the temperature is maintained for 5 hours to obtain a metal sintered blank; Step 3: subjecting the metal sintered blank to rotary forging at 2050° C., keeping the temperature for 6 minutes, cooling the temperature to 1650° C., and performing an annealing treatment for 20 minutes to obtain a first rod; subjecting the first rod to drawing to obtain a rod with a specification of Φ15 mm; Step 4, heating the rod with a specification of Φ15 mm to 1700° C. for secondary rotary forging, keeping the temperature for 5 minutes, then cooling to 1250° C. for secondary annealing, keeping the temperature for 12 minutes, and performing secondary drawing on the rod after the secondary annealing to obtain a rod with a specification of Φ5 mm; Step 5: Wire drawing is performed on the rod with a specification of Φ5mm to obtain a high-strength tungsten alloy wire with a diameter of 11μm.

[0044] Comparative Example 3 This comparative example provides a high-strength tungsten alloy wire and a preparation method thereof, which is different from Example 1 in that Zr in the high-strength tungsten alloy wire is replaced with an equal amount of Ti, specifically including the following contents: The high-strength tungsten alloy wire includes the following chemical components in percentage by mass: Cu: 4.2%, Ni: 2.3%, Ti: 2.1%, Re: 2.8%, Si: 0.6%, C: 3.9% and 84.3% W.

[0045] Step 1: Weigh copper powder, nickel powder, titanium carbide, lanthanum carbide, single crystal silicon and high-purity tungsten powder according to the designed ratio, mix them evenly, and perform high-speed ball milling at a speed of 4500 rpm for 4 hours to obtain a metal mixture; Step 2: In an inert atmosphere, the metal mixture is cold pressed at a pressure of 240 MPa, the pressure is maintained for 140 seconds, the pressed mixture blank is heated to 1650°C at a heating rate of 15°C / min for primary sintering, the temperature is maintained for 4 hours, and the blank is cooled to room temperature to obtain a metal blank; the metal blank is cold pressed for a second time at a pressure of 220 MPa, the pressure is maintained for 140 seconds, the pressed blank is heated to 2200°C at a heating rate of 22°C / min for secondary sintering, and the temperature is maintained for 5 hours to obtain a metal sintered blank; Step 3: subjecting the metal sintered blank to rotary forging at 2050° C., keeping the temperature for 6 minutes, cooling the temperature to 1650° C., and performing an annealing treatment for 20 minutes to obtain a first rod; subjecting the first rod to drawing to obtain a rod with a specification of Φ15 mm; Step 4, heating the rod with a specification of Φ15 mm to 1700° C. for secondary rotary forging, keeping the temperature for 5 minutes, then cooling to 1250° C. for secondary annealing, keeping the temperature for 12 minutes, and performing secondary drawing on the rod after the secondary annealing to obtain a rod with a specification of Φ5 mm; Step 5: Wire drawing is performed on the rod with a specification of Φ5mm to obtain a high-strength tungsten alloy wire with a diameter of 11μm.

[0046] In order to further reflect the technical effect of the present invention, the present invention conducted a tensile strength test on the high-strength tungsten alloy wire obtained in Examples 1-3 and Comparative Examples 1-3. A standard tensile testing machine was used to clamp a 300 mm long tungsten alloy wire, one end was fixed, and the other end was loaded at a constant speed of 5 mm / min. The strength was calculated by the tensile force and cross-sectional area data: σ = F / S; where F is the tensile force, in N; S is the original cross-sectional area of ​​the wire, in mm. The results are shown in Table 1.

[0047] Table 1 Tensile strength test results of high strength tungsten alloy wires obtained in various embodiments and comparative examples

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high strength tungsten alloy wire, characterized in that: The raw materials of the high-strength tungsten alloy wire include the following chemical components in percentage by mass: Cu: 3%-5%, Ni: 2%-3%, Zr: 2%-3%, Re: 2%-4%, Si: 0.5%-0.8%, C: 3%-6% and the remainder of W and unavoidable impurities.

2. The high strength tungsten alloy wire according to claim 1, characterized in that: The diameter of the high-strength tungsten alloy wire is 10 μm-13 μm.

3. The method for preparing the high-strength tungsten alloy wire according to claim 1 or 2, characterized in that: The steps include: Step 1, mixing copper source, nickel source, zirconium source, rhenium source, silicon source, carbon source and tungsten source uniformly, and high-speed ball milling to obtain a metal mixture; Step 2: cold-press the metal mixture under an inert atmosphere, heat it to 1600° C.-1700° C. for primary sintering, and cool it to obtain a metal blank; cold-press the metal blank for a secondary time, heat it to 2000° C.-2500° C. for secondary sintering, and obtain a metal sintered blank; Step 3, subjecting the metal sintered blank to a rotary forging process and then an annealing process to obtain a first rod; subjecting the first rod to a drawing process to obtain a first rod; Step 4: performing secondary rotary forging, secondary annealing and secondary drawing on the first rod in sequence to obtain a second rod; Step 5: Drawing the second rod to obtain high-strength tungsten alloy wire.

4. The method for preparing the high-strength tungsten alloy wire as claimed in claim 3, characterized in that: In step 1, the copper source is copper powder; and / or In step 1, the nickel source is nickel powder; and / or In step 1, the zirconium source is zirconium carbide; and / or In step 1, the rhenium source is rhenium carbide; and / or In step 1, the silicon source is single crystal silicon or silicon carbide; and / or In step 1, the tungsten source is high-purity tungsten powder.

5. The method for preparing the high-strength tungsten alloy wire as claimed in claim 3, characterized in that: In step 1, the rotation speed of the high-speed ball mill is 4000rpm-5000rpm, and the time of the high-speed ball mill is 3h-5h; and / or In step 2, the pressure of the cold press molding is 180MPa-260MPa, and the holding time of the cold press molding is 120s-180s.

6. The method for preparing the high-strength tungsten alloy wire as claimed in claim 3, characterized in that: In step 2, the holding time of the primary sintering is 3h-5h; and / or In step 2, the holding time of the secondary sintering is 4h-6h.

7. The method for preparing the high-strength tungsten alloy wire according to claim 3, wherein: In step 3, the forging temperature of the rotary forging is 2000° C.-2100° C., and the forging time of the rotary forging is 5 min-8 min; and / or In step three, the temperature of the primary annealing treatment is 1600° C.-1700° C., and the holding time of the primary annealing treatment is 15 min-25 min.

8. The method for preparing the high-strength tungsten alloy wire according to claim 3, wherein: In step 4, the forging temperature of the secondary rotary forging treatment is 1600° C.-1800° C., and the forging time of the secondary rotary forging treatment is 4 min-6 min; and / or In step 4, the temperature of the secondary annealing treatment is 1200° C.-1300° C., and the holding time of the secondary annealing treatment is 10 min-15 min.

9. The method for preparing the high-strength tungsten alloy wire according to claim 3, wherein: The specification of the first rod is Φ10mm-Φ15mm; and / or The specification of the second rod is Φ4mm-Φ6mm.

10. Use of the high-strength tungsten alloy wire according to claim 1 or 2 in preparing a printing screen.

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