High-strength tungsten alloy wire and preparation method thereof

Abstract

The invention belongs to the technical field of powder metallurgy, and particularly relates to a high-strength tungsten alloy wire and a preparation method thereof, lanthanum oxide is uniformly doped through a ball-milling mixing and microwave sintering method, the recrystallization temperature of tungsten crystal grains is reduced by coordinating logarithmic strain of a rotary hammer, an annealing process and the like, the tungsten crystal grains uniformly grow, and the high-strength tungsten alloy wire is prepared. The wire diameter of the high-strength tungsten alloy wire is smaller than 30 microns, the tensile strength of the high-strength tungsten alloy wire is larger than or equal to 6200 MPa, and the percent of pass of the high-strength tungsten alloy wire is larger than or equal to 80%.

Description

Technical Field

[0001] The invention belongs to the technical field of powder metallurgy, and specifically relates to a high-strength tungsten alloy wire and a preparation method thereof. Background Art

[0002] Low-strength tungsten wire is very easy to break during the drawing process, which affects the continuous production of drawing and reduces the qualified rate of products. At present, doping lanthanum oxide is an effective measure to improve the strength of tungsten wire, but lanthanum oxide is difficult to disperse evenly in the tungsten matrix and is prone to coarsening, resulting in frequent wire breakage during tungsten wire drawing. Doping and sintering processes are key factors affecting the uniformity of lanthanum oxide.

[0003] In addition, with the advancement of silicon wafer thinning, the trend of tungsten wire thinning has become more and more obvious. However, when using traditional processes to prepare tungsten wire, the wire breakage rate increases significantly with the decrease in wire diameter, especially when the wire diameter is less than 30μm, the wire qualification rate decreases significantly. Studies have found that the limit wire diameter of tungsten wire is restricted by its plasticity, and the plasticity of tungsten wire is mainly affected by the tungsten grain size. The annealing process is an important means to regulate the tungsten grain size. Annealing can effectively increase the tungsten grain size, thereby improving the plasticity of tungsten wire. However, the traditional annealing process has the problems of high recrystallization temperature and uneven tungsten grain size. Therefore, the production of high-strength ultrafine tungsten alloy wire is still a huge challenge. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the main purpose of the present invention is to provide a high-strength tungsten alloy wire and a preparation method thereof.

[0005] According to the first aspect of the present invention, the present invention provides the following technical solution: A method for preparing a high-strength tungsten alloy wire comprises the following steps: S1, adding tungsten powder, lanthanum oxide and grinding balls into a ball mill and performing ball milling to obtain a mixed powder; S2, loading the mixed powder into a mold for isostatic pressing to obtain a tungsten green body; S3, placing the tungsten green body into a microwave oven for sintering to obtain a tungsten green body; S4, heating the tungsten blank and rolling it to obtain a tungsten rod 1; S5, annealing the tungsten rod 1 to obtain a tungsten rod 2; S6, forging the tungsten rod 2 to obtain a tungsten rod 1; S7, annealing the tungsten rod 1 to obtain a tungsten rod 2; S8, drawing the tungsten rod 2 to obtain a high-strength tungsten alloy wire.

[0006] According to the second aspect of the present invention, the present invention provides the following technical solution: A high-strength tungsten alloy wire is prepared by the above-mentioned preparation method of the high-strength tungsten alloy wire. The wire diameter of the high-strength tungsten alloy wire is less than 30 μm, the tensile strength is ≥6200 MPa, and the qualified rate is ≥80%.

[0007] The beneficial effects of the present invention are as follows: The present invention provides a high-strength tungsten alloy wire and a preparation method thereof. The lanthanum oxide is uniformly doped by ball milling and microwave sintering. The logarithmic strain of a rotary hammer, an annealing process, etc. are coordinated to reduce the recrystallization temperature of the tungsten grains, and the tungsten grains are uniformly grown, thereby improving the plasticity of the tungsten wire and preparing the high-strength tungsten alloy wire. The high-strength tungsten alloy wire has a wire diameter of less than 30 μm, a tensile strength of ≥6200 MPa, and a qualified rate of ≥80%. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0009] Figure 1 The metallographic image of the tungsten rod 2 prepared in Example 1 of the present invention; Figure 2 This is a metallographic diagram of the tungsten rod 2 prepared in Comparative Example 2 of the present invention; Figure 3 This is a metallographic diagram of the tungsten rod 2 prepared in Comparative Example 5 of the present invention; Figure 4 This is a metallographic image of the tungsten rod 2 prepared in Comparative Example 6 of the present invention.

[0010] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0011] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0012] According to the first aspect of the present invention, the present invention provides the following technical solution: A method for preparing a high-strength tungsten alloy wire comprises the following steps: S1, adding tungsten powder, lanthanum oxide and grinding balls into a ball mill and performing ball milling to obtain a mixed powder; S2, loading the mixed powder into a mold for isostatic pressing to obtain a tungsten green body; S3, placing the tungsten green body into a microwave oven for sintering to obtain a tungsten green body; S4, heating the tungsten blank and rolling it to obtain a tungsten rod 1; S5, annealing the tungsten rod 1 to obtain a tungsten rod 2; S6, forging the tungsten rod 2 to obtain a tungsten rod 1; S7, annealing the tungsten rod 1 to obtain a tungsten rod 2; S8, drawing the tungsten rod 2 to obtain a high-strength tungsten alloy wire.

[0013] The present invention effectively reduces the agglomeration of lanthanum oxide by synergistically combining ball milling and microwave sintering, reduces the wire breakage rate during the drawing process, and improves the tensile strength and qualified rate of tungsten wire. By synergistically regulating the logarithmic strain, annealing time and annealing temperature of the rotary hammer, the recrystallization temperature of tungsten grains is reduced, and the tungsten grains are uniformly grown, thereby improving the plasticity of the tungsten wire.

[0014] Preferably, in step S1, the mass fraction of lanthanum oxide in the mixed powder is 0.65-0.75wt%; the grinding balls are agate ball milling beads, the mass ratio of the mixed powder to the grinding balls is (8-10):1, the diameter of the grinding balls is 3.5-4.0mm, the ball milling speed is 240-250rpm, and the ball milling time is 3-3.5h. Specifically, the mass fraction of lanthanum oxide in the mixed powder can be, for example, any one of 0.65wt%, 0.66wt%, 0.67wt%, 0.68wt%, 0.69wt%, 0.70wt%, 0.71wt%, 0.72wt%, 0.73wt%, 0.74wt%, 0.75wt% or a range between any two of them; the mass ratio of the mixed powder to the grinding ball can be, for example, any one of 8:1, 8.5:1, 9:1, 9.5:1, 10:1 or a range between any two of them; the ball milling speed can be, for example, any one of 240rpm, 241rpm, 242rpm, 243rpm, 244rpm, 245rpm, 246rpm, 247rpm, 248rpm, 249rpm, 250rpm or a range between any two of them; the ball milling time can be, for example, any one of 3h, 3.25h, 3.5h or a range between any two of them.

[0015] Preferably, in step S2, the isostatic pressure is 120-130 MPa. Specifically, the isostatic pressure may be, for example, any one of 120 MPa, 121 MPa, 122 MPa, 123 MPa, 124 MPa, 125 MPa, 126 MPa, 127 MPa, 128 MPa, 129 MPa, and 130 MPa, or a range between any two thereof.

[0016] Preferably, in step S3, the tungsten green body is placed in a cylinder of a microwave oven and heated under H 2 The volume percentage of H is 5 vol%. 2 +N 2 The sintering is carried out in an atmosphere to prepare a tungsten blank with a diameter of 18.5±0.3 mm, wherein the cylinder rotates at a speed of 5 rpm (to ensure that the tungsten green blank is heated evenly), the sintering temperature is 1600-1850°C, and the sintering time is 20-25 min. Specifically, the sintering temperature can be, for example, any one of 1600°C, 1650°C, 1700°C, 1750°C, 1800°C, 1850°C, or a range between any two thereof, and the sintering time can be, for example, any one of 20 min, 21 min, 22 min, 23 min, 24 min, 25 min, or a range between any two thereof.

[0017] Preferably, in step S4, the tungsten blank is heated to 1700-1800°C for rolling to obtain a tungsten rod 1 having a diameter of 9±0.5 mm. Specifically, the heating temperature of the tungsten blank may be, for example, any one of 1700°C, 1710°C, 1720°C, 1730°C, 1740°C, 1750°C, 1760°C, 1770°C, 1780°C, 1790°C, 1800°C or a range between any two thereof.

[0018] Preferably, in step S5, the tungsten rod 1 is annealed to reduce the internal stress of the tungsten rod, wherein the annealing temperature is 2100-2300°C, the tungsten rod 1 moves along its axial direction during annealing, and the annealing speed is 0.25-0.35 m / min to obtain the tungsten rod 2. Specifically, the annealing temperature may be, for example, any one of 2100°C, 2150°C, 2200°C, 2250°C, and 2300°C, or a range between any two thereof, and the annealing speed may be, for example, any one of 0.25 m / min, 0.26 m / min, 0.27 m / min, 0.28 m / min, 0.29 m / min, 0.30 m / min, 0.31 m / min, 0.32 m / min, 0.33 m / min, 0.34 m / min, and 0.35 m / min, or a range between any two thereof.

[0019] Preferably, in step S6, the tungsten rod 2 is rotary forged to obtain a tungsten rod 1, whose logarithmic strain is 0.95-1.30 (the annealing recrystallization temperature of the tungsten rod 1 with different logarithmic strains is different). Logarithmic strain ε=ln(S 0 / S n ), S 0 is the cross-sectional area of ​​tungsten rod 2, S nis the cross-sectional area of ​​the tungsten rod 1 obtained after the tungsten rod 2 is rotary forged. Specifically, the logarithmic strain may be, for example, any one of 0.95, 1.00, 1.05, 1.10, 1.15, 1.20, 1.25, 1.30 or a range between any two thereof.

[0020] Preferably, in step S7, the annealing temperature is 2400-2500° C., the tungsten rod 1 moves along its axial direction during annealing, and the annealing speed is 0.35-0.50 m / min. Specifically, the annealing temperature may be, for example, any one of 2400°C, 2410°C, 2420°C, 2430°C, 2440°C, 2450°C, 2460°C, 2470°C, 2480°C, 2490°C, and 2500°C, or a range between any two of them; and the annealing speed may be, for example, any one of 0.35 m / min, 0.36 m / min, 0.37 m / min, 0.38 m / min, 0.39 m / min, 0.40 m / min, 0.41 m / min, 0.42 m / min, 0.43 m / min, 0.44 m / min, 0.45 m / min, 0.46 m / min, 0.47 m / min, 0.48 m / min, 0.49 m / min, and 0.50 m / min, or a range between any two of them. More preferably, the tungsten grain structure of the tungsten rod 2 is uniform, the average particle size of the tungsten grains is 35-40 μm, and the hardness HV30 of the tungsten rod 2 is 385-410.

[0021] According to the second aspect of the present invention, the present invention provides the following technical solution: A high-strength tungsten alloy wire is prepared by the above-mentioned preparation method of high-strength tungsten alloy wire. The high-strength tungsten alloy wire has a wire diameter of less than 30 μm, a tensile strength of ≥6200 MPa, and a qualified rate of ≥80% (a single drawing unbroken wire length greater than 160 km is considered qualified).

[0022] Preferably, the high-strength tungsten alloy wire is a tungsten wire with a wire diameter of 28 μm, a tensile strength of >6200 MPa, and a qualified rate of >80%; Preferably, the high-strength tungsten alloy wire is a tungsten wire with a wire diameter of 25 μm, a tensile strength of >6400 MPa, and a qualified rate of >80%; Preferably, the high-strength tungsten alloy wire is a tungsten wire with a wire diameter of 22 μm, a tensile strength of >6550 MPa, and a qualified rate of >80%; The technical solution of the present invention is further described below in conjunction with specific embodiments.

[0023] Example 1 A method for preparing a high-strength tungsten alloy wire comprises the following steps: S1. Add tungsten powder, lanthanum oxide and grinding balls into a ball mill and grind them to obtain a mixed powder; the mass fraction of lanthanum oxide in the mixed powder is 0.70wt%; the grinding balls are agate ball milling beads, the mass ratio of the mixed powder to the grinding balls is 8:1, the diameter of the grinding balls is 3.5mm, the ball milling speed is 240rpm, and the ball milling time is 3h; S2, the mixed powder is loaded into a mold for isostatic pressing to obtain a tungsten green body; the isostatic pressing pressure is 120 MPa; S3, put the tungsten green body into the cylinder of the microwave oven, and 2 The volume percentage of H is 5 vol%. 2 +N 2 Sintering was performed in an atmosphere to prepare a tungsten blank with a diameter of 18.5±0.3 mm, wherein the cylinder rotated at a speed of 5 rpm, the sintering temperature was 1800°C, and the sintering time was 20 min; S4, heating the tungsten blank to 1700° C. and rolling it to obtain a tungsten rod 1 with a diameter of 9±0.5 mm; S5, annealing the tungsten rod 1, wherein the annealing temperature is 2250° C. and the annealing speed is 0.30 m / min, to obtain a tungsten rod 2; S6, forging the tungsten rod 2 with a rotary hammer to obtain a tungsten rod 1, whose logarithmic strain is 1.15; S7, annealing the tungsten rod 1 at a temperature of 2400°C and an annealing speed of 0.45 m / min to obtain a tungsten rod 2 (such as Figure 1 As shown); the tungsten grain structure of the tungsten rod 2 is uniform, the average particle size of the tungsten grain is 38μm, and the hardness HV30 of the tungsten rod 2 is 392; S8. The tungsten rod 2 is drawn to prepare a type 28 tungsten wire. A total of 20 rolls of tungsten wire are produced, with an average tensile strength of 6324 MPa, a range of 84 MPa, a ratio of the range to the average of 1.33%, 17 rolls with a length greater than 160 km, and a pass rate of 85%.

[0024] Example 2 A method for preparing a high-strength tungsten alloy wire comprises the following steps: S1. Add tungsten powder, lanthanum oxide and grinding balls into a ball mill and grind them to obtain mixed powder; the mass fraction of lanthanum oxide in the mixed powder is 0.75wt%; the grinding balls are agate ball milling beads, the mass ratio of mixed powder to grinding balls is 10:1, the diameter of the grinding balls is 4.0mm, the ball milling speed is 240rpm, and the ball milling time is 3h; S2, loading the mixed powder into a mold for isostatic pressing to obtain a tungsten green body; the isostatic pressing pressure is 130 MPa; S3, put the tungsten green body into the cylinder of the microwave oven, and 2 The volume percentage of H is 5 vol%. 2+N 2 Sintering was performed in an atmosphere to prepare a tungsten blank with a diameter of 18.5±0.3 mm, wherein the cylinder rotated at a speed of 5 rpm, the sintering temperature was 1750°C, and the sintering time was 25 min; S4, heating the tungsten blank to 1800° C. and rolling it to obtain a tungsten rod 1 with a diameter of 9±0.5 mm; S5, annealing the tungsten rod 1, wherein the annealing temperature is 2200° C. and the annealing speed is 0.30 m / min, to obtain a tungsten rod 2; S6, forging the tungsten rod 2 with a rotary hammer to obtain a tungsten rod 1, whose logarithmic strain is 1.24; S7, annealing the tungsten rod 1 at an annealing temperature of 2450° C. and an annealing speed of 0.35 m / min to obtain a tungsten rod 2; the tungsten grain structure of the tungsten rod 2 is uniform, the average particle size of the tungsten grains is 36 μm, and the hardness HV30 of the tungsten rod 2 is 400; S8. The tungsten rod 2 is drawn to prepare a type 25 tungsten wire. A total of 19 rolls of tungsten wire are produced, with an average tensile strength of 6490 MPa, a range of 75 MPa, a ratio of the range to the average of 1.16%, 16 rolls with a length greater than 160 km, and a pass rate of 84%.

[0025] Example 3 A method for preparing a high-strength tungsten alloy wire comprises the following steps: S1. Add tungsten powder, lanthanum oxide and grinding balls into a ball mill and grind them to obtain a mixed powder; the mass fraction of lanthanum oxide in the mixed powder is 0.65wt%; the grinding balls are agate ball milling beads, the mass ratio of the mixed powder to the grinding balls is 8:1, the diameter of the grinding balls is 3.5mm, the ball milling speed is 250rpm, and the ball milling time is 3.5h; S2, loading the mixed powder into a mold for isostatic pressing to obtain a tungsten green body; the isostatic pressing pressure is 130 MPa; S3, put the tungsten green body into the cylinder of the microwave oven, and 2 The volume percentage of H is 5 vol%. 2 +N 2 Sintering was performed in an atmosphere to prepare a tungsten blank with a diameter of 18.5±0.3 mm, wherein the cylinder rotated at a speed of 5 rpm, the sintering temperature was 1700°C, and the sintering time was 20 min; S4, heating the tungsten blank to 1750° C. and rolling it to obtain a tungsten rod 1 with a diameter of 9±0.5 mm; S5, annealing the tungsten rod 1, wherein the annealing temperature is 2200° C. and the annealing speed is 0.35 m / min, to obtain a tungsten rod 2; S6, forging the tungsten rod 2 with a rotary hammer to obtain a tungsten rod 1, whose logarithmic strain is 0.95; S7, annealing the tungsten rod 1 at an annealing temperature of 2400° C. and an annealing speed of 0.50 m / min to obtain a tungsten rod 2; the tungsten grain structure of the tungsten rod 2 is uniform, the average particle size of the tungsten grains is 40 μm, and the hardness HV30 of the tungsten rod 2 is 398; S8. The tungsten rod 2 is drawn to prepare a type 22 tungsten wire. A total of 20 rolls of tungsten wire are produced, with an average tensile strength of 6610 MPa, a range of 43 MPa, a ratio of the range to the average of 0.65%, 17 rolls with a length greater than 160 km, and a pass rate of 85%.

[0026] Comparative Example 1 The difference from Example 1 is that a tungsten alloy wire with a wire diameter of 28 μm is prepared according to a traditional production process, specifically: tungsten powder and lanthanum oxide are mixed in a high-energy mixer, and a tungsten rod is obtained by sintering and hot rolling using a medium-frequency sintering method, and the logarithmic strain during rotary forging is 0.75.

[0027] The tungsten grain size of the tungsten rod 2 prepared in this comparative example is uneven and the hardness fluctuates greatly. A total of 20 rolls of tungsten wire were produced, with an average tensile strength of 5546 MPa, a range of 152 MPa, and a ratio of the range to the average of 2.74%. There were 11 rolls with a length greater than 160 km, and a pass rate of 55%.

[0028] Comparative Example 2 The difference from Example 1 is that in step S1, tungsten powder and lanthanum oxide are added into a high-energy powder mixer according to the proportions in Example 1 for mixing.

[0029] The tungsten rod 2 (such as Figure 2 The tungsten grain size of the wire (as shown) is uneven and the hardness fluctuates greatly. A total of 20 rolls of tungsten wire were produced, with an average tensile strength of 5752MPa, a range of 127MPa, and a ratio of the range to the average of 2.21%. There were 13 rolls with a length greater than 160km, and a pass rate of 65%.

[0030] Comparative Example 3 The difference from Example 1 is that in step S3, the cylinder of the microwave oven does not rotate.

[0031] The tungsten grain size of the tungsten rod 2 prepared in this comparative example is uneven and the hardness fluctuates greatly. A total of 20 rolls of tungsten wire were produced, with an average tensile strength of 5960 MPa, a range of 96 MPa, a ratio of the range to the average value of 1.61%, 13 rolls with a length greater than 160 km, and a pass rate of 65%.

[0032] Comparative Example 4 The difference from Embodiment 1 is that step S5 is not performed.

[0033] During the forging process of this comparative example, the tungsten rod was severely cracked and could not be deformed further.

[0034] Comparative Example 5 The difference from Example 1 is that in step S6, the logarithmic strain is 1.54.

[0035] The tungsten rod 2 (such as Figure 3 The tungsten grains of the wire (as shown) are relatively small, HV30 is 448, and a total of 20 rolls of tungsten wire were produced, with an average tensile strength of 6443MPa, a range of 58MPa, and a ratio of the range to the average of 0.90%. There are 7 rolls with a length greater than 160km, and the qualified rate is 35%.

[0036] Comparative Example 6 The difference from Example 1 is that in step S7, the annealing temperature is 2700°C.

[0037] The tungsten rod 2 (such as Figure 4 The tungsten grains of the wire (as shown) are too large, HV30 is 356, and a total of 20 rolls of tungsten wire were produced, with an average tensile strength of 5068MPa, a range of 86MPa, and a ratio of the range to the average of 1.70%. There are 11 rolls with a length greater than 160km, and a pass rate of 55%.

[0038] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A method for preparing high-strength tungsten alloy wire, characterized in that: The steps include: S1, adding tungsten powder, lanthanum oxide and grinding balls into a ball mill and performing ball milling to obtain a mixed powder; S2, loading the mixed powder into a mold for isostatic pressing to obtain a tungsten green body; S3, placing the tungsten green body into a microwave oven for sintering to obtain a tungsten blank; S4, heating the tungsten blank and rolling it to obtain a tungsten rod 1; S5, annealing the tungsten rod 1 to obtain a tungsten rod 2; S6, forging the tungsten rod 2 to obtain a tungsten rod 1; S7, annealing the tungsten rod 1 to obtain a tungsten rod 2; S8, drawing the tungsten rod 2 to obtain a high-strength tungsten alloy wire.

2. The method for preparing high-strength tungsten alloy wire according to claim 1, characterized in that: In the step S1, the mass fraction of lanthanum oxide in the mixed powder is 0.65-0.75wt%; the grinding balls are agate ball milling beads, the mass ratio of the mixed powder to the grinding balls is (8-10):1, the diameter of the grinding balls is 3.5-4.0mm, the ball milling speed is 240-250rpm, and the ball milling time is 3-3.5h.

3. The method for preparing high-strength tungsten alloy wire according to claim 1, characterized in that: In step S2, the isostatic pressure is 120-130 MPa.

4. The method for preparing high-strength tungsten alloy wire according to claim 1, characterized in that: In the step S3, the tungsten green body is placed in a cylinder of a microwave oven and sintered in an H2+N2 atmosphere with a H2 volume ratio of 5 vol% to prepare a tungsten green body with a diameter of 18.5±0.3 mm, wherein the cylinder rotates at a speed of 5 rpm, the sintering temperature is 1600~1850°C, and the sintering time is 20~25 min.

5. The method for preparing high-strength tungsten alloy wire according to claim 1, characterized in that: In the step S4, the tungsten blank is heated to 1700-1800° C. and rolled to obtain a tungsten rod 1 with a diameter of 9±0.5 mm.

6. The method for preparing high-strength tungsten alloy wire according to claim 1, characterized in that: In step S5, the tungsten rod 1 is annealed to reduce the internal stress of the tungsten rod, wherein the annealing temperature is 2100-2300° C. During annealing, the tungsten rod 1 moves along its axial direction, and the annealing speed is 0.25-0.35 m / min, thereby obtaining a tungsten rod 2.

7. The method for preparing high-strength tungsten alloy wire according to claim 1, characterized in that: In the step S6, the tungsten rod 2 is rotary forged to obtain a tungsten rod 1, whose logarithmic strain is 0.95-1.

30.

8. The method for preparing high-strength tungsten alloy wire according to claim 1, characterized in that: In step S7, the annealing temperature is 2400-2500° C., the tungsten rod 1 moves along its axial direction during annealing, and the annealing speed is 0.35-0.50 m / min.

9. The method for preparing high-strength tungsten alloy wire according to claim 1, characterized in that: The tungsten crystal grain structure of the tungsten rod 2 is uniform, the average particle size of the tungsten crystal grains is 35-40 μm, and the hardness HV30 of the tungsten rod 2 is 385-410.

10. A high strength tungsten alloy wire, characterized in that: The high-strength tungsten alloy wire is prepared by the preparation method of any one of claims 1 to 9, wherein the wire diameter of the high-strength tungsten alloy wire is less than 30 μm, the tensile strength is ≥6200 MPa, and the qualified rate is ≥80%.

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