Metal Wire

Abstract

To provide a metal wire that is thin, has great elongation, and also has high tensile strength.SOLUTION: This metal wire has a total elongation of 5-16%, a tensile strength of 1600-2400 MPa, and a wire diameter of less than 40 μm.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to metal lines. [Background technology]

[0002] 2. Description of the Related Art Metal wires made of stainless steel or tungsten and used for metal mesh applications are known (see, for example, Patent Documents 1 to 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-022814 A [Patent Document 2] Patent No. 5722637 [Patent Document 3] Japanese Patent Application Publication No. 11-151871 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a metal wire that is thin, has high elongation, and has high tensile strength. [Means for solving the problem]

[0005] A metal wire according to one aspect of the present invention has a total elongation of 5% or more and 16% or less, a tensile strength of 1600 MPa or more and 2400 MPa or less, and a wire diameter of less than 40 μm. Effect of the Invention

[0006] According to the present invention, it is possible to provide a metal wire that is thin, has high elongation, and has high tensile strength. [Brief description of the drawings]

[0007] [Figure 1]FIG. 1 is a flowchart showing an example of a method for manufacturing a metal wire according to an embodiment. [Diagram 2] FIG. 2 is a scatter diagram showing the relationship between the total elongation and the tensile strength of the metal wires according to the examples and the comparative examples. [Diagram 3] FIG. 3 is a perspective view showing a metal wire according to an embodiment and a metal mesh woven using the metal wire. [Figure 4] FIG. 4 is a cross-sectional view of a metal mesh woven using metal wires according to an embodiment. [Diagram 5] FIG. 5 is a diagram showing an outline of a coiling test of a metal wire according to an embodiment. [Figure 6A] FIG. 6A is a diagram showing the appearance of the metal wire according to Example 16 after the coiling test. [Figure 6B] FIG. 6B is an enlarged view of a portion of FIG. 6A. [Figure 7A] FIG. 7A is a diagram showing the appearance of the metal wire according to Comparative Example 10 after the coiling test. [Figure 7B] FIG. 7B is an enlarged view of a portion of FIG. 7A. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, the metal wire according to the embodiment of the present invention will be described in detail with reference to the drawings. Note that each of the embodiments described below shows a specific example of the present invention. Therefore, the numerical values, shapes, materials, components, arrangement and connection forms of the components, steps, order of steps, etc. shown in the following embodiments are merely examples and are not intended to limit the present invention. Therefore, among the components in the following embodiments, components that are not described in the independent claims will be described as optional components.

[0009] In addition, each figure is a schematic diagram and is not necessarily illustrated precisely. Therefore, for example, the scales in each figure do not necessarily match. In addition, in each figure, substantially the same configurations are given the same reference numerals, and duplicated explanations are omitted or simplified.

[0010] Furthermore, in this specification, terms indicating relationships between elements, terms indicating the shapes of elements, and numerical ranges are not expressions that only express a strict meaning, but are expressions that also include a substantially equivalent range, for example, a difference of about a few percent.

[0011] (Embodiment) [Metal wire] First, the configuration of the metal wire according to the embodiment will be described.

[0012] The metal wire according to the present embodiment is an alloy wire made of an alloy of tungsten (W) and at least one metal element (hereinafter referred to as an alloy element) different from tungsten. The content of tungsten contained in the metal wire is, for example, 90wt% or more. Here, the content is the ratio of the mass of the metal element (e.g., tungsten) to the mass of the metal wire. The content of tungsten may be 95wt% or more, 99wt% or more, or even 99.9wt% or more. The metal wire may contain unavoidable elements that are unavoidably mixed in during manufacturing.

[0013] At least one kind of alloying element is a metal element included in group 7 or group 8 of the periodic table. Specifically, the alloying element is rhenium (Re) of group 7 or ruthenium (Ru) of group 8. For example, the metal wire is an alloy wire of tungsten and rhenium (hereinafter, referred to as rhenium-tungsten alloy wire). Alternatively, the metal wire is an alloy wire of tungsten and ruthenium (hereinafter, referred to as ruthenium-tungsten alloy wire). Note that the metal wire may be an alloy wire of tungsten and two or more kinds of alloying elements, such as an alloy wire of tungsten, rhenium, and ruthenium.

[0014] In the case of the rhenium tungsten alloy wire, the rhenium content is, for example, 0.1wt% or more and 10wt% or less. The rhenium content may be 0.5wt% or more and 9wt% or less, or 3wt% or more and 5wt% or less. In the case of the ruthenium tungsten alloy wire, the ruthenium content is, for example, 0.05wt% or more and 0.3wt% or less. The ruthenium content may be 0.1wt% or more and 0.2wt% or less.

[0015] The higher the content of rhenium and / or ruthenium, the higher the elongation and tensile strength of the metal wire. However, as the tensile strength increases, the problem of greater elongation occurs. Also, the higher the content of rhenium and / or ruthenium, the more difficult it is to reduce the diameter of the metal wire. In this embodiment, the inventors of the present application have made extensive studies and devised the alloy element content and the processing step for reducing the diameter, thereby realizing a metal wire that is thin, has great elongation, and has high tensile strength. A specific method for manufacturing the metal wire will be described later.

[0016] The wire diameter of the metal wire in this embodiment is less than 40 μm. The wire diameter of the metal wire may be 30 μm or less, or 20 μm or less. For example, the wire diameter of the metal wire may be 18 μm or less, 15 μm or less, 12 μm or less, or 10 μm or less. The wire diameter of the metal wire may be as small as the processing limit (for example, 5 μm).

[0017] The total elongation of the metal wire in this embodiment is 5% or more. As a result, when the metal wire is used as warp and weft threads of a metal mesh, breakage of the metal wire is suppressed during weaving processing and when the metal mesh is used. The total elongation of the metal wire may be 7% or more, 9% or more, or 11% or more. The greater the total elongation, the greater the effect of suppressing breakage of the metal wire.

[0018] On the other hand, if the total elongation is too large, problems may occur when the metal mesh is used. For example, if the metal mesh is a screen mesh used for screen printing, the mesh may widen due to the elongation of the metal wire when the metal mesh is pressed into a squeegee, and the shape of the ink passage area may be deformed. In other words, the accuracy of the screen printing may decrease. In contrast, the total elongation of the metal wire according to this embodiment is 16% or less. This allows the accuracy of the screen printing to be improved, for example, when the metal mesh is used as a screen mesh.

[0019] The total elongation is the total elongation at break, measured by an extensometer. Specifically, the total elongation of the metal wire is the total elongation at break of the metal wire, which is the sum of the elastic elongation and the plastic elongation of the extensometer, and is expressed as a percentage of the extensometer gauge length.

[0020] The tensile strength of the metal wire according to the present embodiment is 1600 MPa (=N / mm 2 ) or more and 2400 MPa or less. As a result, when the metal wire is used as the warp and weft of a metal mesh, breakage of the metal wire is suppressed during use of the metal mesh. The tensile strength of the metal wire may be 1700 MPa or more, 1800 MPa or more, 2000 MPa or more, or 2100 MPa or more. The higher the tensile strength, the greater the effect of suppressing breakage of the metal wire. In addition, the durability of a metal mesh woven using metal wires with high tensile strength can be improved. For example, when the metal mesh is used as a screen mesh, it can withstand the pressing pressure of a squeegee. The total elongation is 5% or more and 16% or less, and the wire diameter is 40 μm Not yet Full In the range, the upper limit of the tensile strength was about 2400 MPa.

[0021] [Manufacturing method] Next, a method for manufacturing a metal wire according to the present embodiment will be described with reference to Fig. 1. Fig. 1 is a flow chart showing an example of the method for manufacturing a metal wire according to the present embodiment.

[0022] As shown in FIG. 1, first, a metal ingot is prepared (S10). Specifically, first, a mixture is prepared by mixing tungsten powder and a powder made of an alloy metal (for example, rhenium powder or ruthenium powder) in a predetermined ratio. The average particle size of the powder is, for example, in the range of 3 μm to 4 μm, but is not limited thereto. The prepared mixture is pressed and sintered to produce a tungsten alloy ingot. The ingot is, for example, a rod-shaped ingot with a cross-sectional diameter of about 15 mm.

[0023] Next, the ingot is subjected to a swaging process (S11). Specifically, the ingot is forged and compressed from the periphery to be stretched and formed into a wire-shaped tungsten wire. Rolling may be used instead of the swaging process. The swaging process (S11) is repeated together with the annealing process (S13).

[0024] Specifically, by repeating the swaging process, the diameter of the ingot decreases in the order of 13.6 mm, 10.6 mm, 8 mm, 6.5 mm, and 3.3 mm. When the diameter of the ingot is one of these diameters (Yes in S12), annealing is performed (S13). The annealing temperature is, for example, 2400° C. After the diameter reaches 3.3 mm, annealing and swaging are performed, so that the diameter becomes 3 mm.

[0025] Next, the metal wire with a diameter of 3 mm after swaging is heated to 900°C (S14). Specifically, the metal wire is directly heated with a burner or the like. By heating the metal wire, an oxide layer is formed on the surface of the metal wire to prevent it from breaking during the subsequent hot drawing process.

[0026] Next, hot drawing is performed (S15). Specifically, the metal wire is drawn using one or more wire drawing dies, that is, the metal wire is drawn (reduced in diameter) while being heated. The heating temperature is, for example, 1000°C. Note that the higher the heating temperature, the more easily the wire can be drawn since the workability of the metal wire is improved. The hot drawing is performed repeatedly while changing the wire drawing dies. The cross-sectional reduction rate of the metal wire in one drawing using one wire drawing die is, for example, 10% to 40%. In the hot drawing process, a lubricant in which graphite is dispersed in water may be used.

[0027] Next, the drawn metal wire is subjected to an intermediate recrystallization treatment (S16). Specifically, the metal wire is heated at a temperature of 1200°C or higher to recrystallize the crystals contained in the metal wire. The heated wire drawing and the intermediate recrystallization treatment are repeated until the last wire drawing process is performed (No in S17). The number of repetitions (i.e., the number of intermediate recrystallization treatments) is, for example, 5 to 10 times.

[0028] In the repeated hot drawing, a wire drawing die having a smaller hole diameter than the wire drawing die used in the previous wire drawing is used. In the repeated hot drawing, the metal wire is heated to a lower heating temperature than the heating temperature in the previous wire drawing. For example, the heating temperature in the wire drawing process immediately before the final wire drawing process is lower than the heating temperatures up to that point, for example, 400°C.

[0029] When the drawing process is the last one (Yes in S17), hot drawing is performed as the final drawing (S18), thereby obtaining a metal wire with a wire diameter of less than about 40 μm.

[0030] Next, the drawn metal wire is subjected to electrolytic polishing (S19). Electrolytic polishing is performed by immersing the metal wire and a counter electrode in an electrolytic solution such as a sodium hydroxide solution, and generating a potential difference between the metal wire and the counter electrode. The diameter of the metal wire can be finely adjusted by electrolytic polishing.

[0031] After the electrolytic polishing, the metal wire is subjected to a final heat treatment (S20). The temperature of the final heat treatment is, for example, 1200° C. or more and 1700° C. or less.

[0032] Through the above steps, the metal wire according to the present embodiment is manufactured. Through the above manufacturing steps, the length of the metal wire immediately after manufacture is, for example, 50 km or more, and can be used industrially. The metal wire is cut to an appropriate length depending on the mode of use, and is used for weaving mesh, etc. In this way, in the present embodiment, the metal wire can be mass-produced industrially, and can be used in various fields, mainly for mesh for screen printing.

[0033] Each process shown in the method for producing a metal wire is performed, for example, in-line. Specifically, a plurality of wiredrawing dies used in step S15 are arranged on a production line in order of decreasing hole diameter. A heating device such as a burner is arranged between each of the wiredrawing dies. The heating device is arranged for hot wiredrawing and intermediate recrystallization treatment. A plurality of wiredrawing dies used in step S18 are arranged downstream (on the post-process side) of the wiredrawing die used in step S15 in order of decreasing hole diameter, and an electrolytic polishing device and a heating device for final heat treatment are arranged downstream of the wiredrawing die with the smallest hole diameter. Each process may be performed separately.

[0034] [Example] Next, examples and comparative examples of metal wires manufactured according to the above-mentioned manufacturing method will be described. The metal wires according to the following Examples 1 to 15 and Comparative Examples 1 to 8 are manufactured by appropriately varying various parameters (specifically, wire diameter, type and amount of additives, final heat treatment temperature, and number of intermediate recrystallization treatments) in the manufacturing method. Specifically, they are as shown in Tables 1 and 2 below.

[0035] [Table 1]

[0036] [Table 2]

[0037] 2 is a scatter diagram showing the relationship between the total elongation and the tensile strength of the metal wires according to the examples and the comparative examples, in which the horizontal axis represents the total elongation of the metal wire and the vertical axis represents the tensile strength of the metal wire.

[0038] The metal wires according to Examples 1 to 15 all have a wire diameter of less than 40 μm. As shown in FIG. 2, the metal wires according to each Example all have a tensile strength within a range of 1600 MPa or more and 2400 MPa or less, and a total elongation within a range of 5% or more and 16% or less. In FIG. 2, the above ranges of tensile strength and total elongation are shown by dashed lines. In contrast, the metal wires according to Comparative Examples 1 to 8 are outside the range shown by the dashed lines in FIG. 2.

[0039] The following describes the results of an investigation into parameters in the manufacturing method of the metal wire that are assumed to be the cause of the difference between the examples and the comparative examples.

[0040] <Additives> First, the types of alloying elements and the amounts of added alloying elements (contents in the metal wire) will be described. From Table 1, it can be seen that there is a tendency for the total elongation to increase when the amount of added alloying elements is increased.

[0041] In addition, Example 5 and Example 9 in Table 1 have the same parameters, except for the amount of Re added, including the wire diameter (35 μm), additive (Re), final heat treatment temperature (1600° C.), and number of intermediate recrystallization treatments (6 times). By comparing Example 5 and Example 9, it can be seen that Example 9, which has a larger amount of Re added, has a larger total elongation and a lower tensile strength than Example 5.

[0042] This shows that when the amount of alloying elements added is increased, the total elongation can be increased while maintaining a tensile strength of 1600 MPa or more, whereas when the amount of alloying elements added is decreased, the tensile strength can be increased while maintaining a total elongation of 5% or more.

[0043] When Ru is used as an additive as in Example 11, both the total elongation and the tensile strength can be secured to be large even in an amount that is about one order of magnitude smaller than the amount of Re added.

[0044] <Final heat treatment temperature> Next, the final heat treatment temperature will be described. From Table 1, it can be seen that there is a tendency for the total elongation to increase as the final heat treatment temperature increases.

[0045] In addition, Example 1 and Example 2 in Table 1 have the same parameters, except for the wire diameter (11 μm), additive (Re), additive amount (5 wt%), and number of intermediate recrystallization treatments (8 times), except for the final heat treatment temperature. By comparing Example 1 and Example 2, it can be seen that Example 2, which has a higher final heat treatment temperature, has a larger total elongation and a lower tensile strength than Example 1. Example 5 and Example 6 have the same parameters except for the final heat treatment temperature, and a similar tendency is observed. Examples 7 to 9, Examples 12 and 13, and Examples 14 and 15 also have the same parameters except for the final heat treatment temperature, and a similar tendency is observed. In both cases where the wire diameter is 11 μm (Examples 1 and 2) and 35 μm (Example 5, etc.), a similar tendency is observed.

[0046] From these facts, regardless of the wire diameter of the metal wire, when the final heat treatment temperature is increased, the total elongation can be increased while maintaining a tensile strength of 1600 MPa or more. Conversely, regardless of the wire diameter of the metal wire, when the final heat treatment temperature is decreased, the tensile strength can be increased while maintaining a total elongation of 5% or more.

[0047] Comparative Examples 1 and 2 in Table 2 have the same parameters as Examples 12 and 13 in Table 1, except for the final heat treatment temperature. However, Comparative Examples 1 and 2, in which the final heat treatment temperature is 1400°C or less, have a total elongation of less than 5%. From this, it can be said that, when the wire diameter is at least 35 μm, Re is added at 5 wt%, and intermediate recrystallization treatment is performed five times, the total elongation can be made 5% or more by performing the final heat treatment at a temperature higher than 1400°C, preferably at least 1500°C.

[0048] When Ru is used as an additive as in Example 11, both the total elongation and the tensile strength can be secured at a high level even when the final heat treatment temperature is 1200°C.

[0049] <Number of intermediate recrystallization treatments> Next, the number of intermediate recrystallization treatments will be explained. From Table 1, it can be seen that the total elongation tends to increase as the number of intermediate recrystallization treatments increases. Specifically, if the number of intermediate recrystallization treatments is 5 or more, the total elongation can be made 5% or more.

[0050] Moreover, Example 6 and Example 10 in Table 1 have the same parameters, except for the wire diameter (35 μm), additive (Re), additive amount (3 wt%), and final heat treatment temperature (1700° C.), except for the number of intermediate recrystallization treatments. By comparing Example 6 and Example 10, it can be seen that Example 6, which has a larger number of intermediate recrystallization treatments, has a larger total elongation and a lower tensile strength than Example 10. Conversely, when the number of intermediate recrystallization treatments is reduced, the tensile strength can be increased while maintaining a total elongation of 5% or more.

[0051] Note that Comparative Example 4 in Table 2 has the same parameters as Examples 6 and 10 in Table 1, except for the number of intermediate recrystallization treatments. However, in this case, Examples 6 and 10, which have five or more intermediate recrystallization treatments, have both greater total elongation and tensile strength than Comparative Example 4, which has three intermediate recrystallization treatments. From this point of view, it is clear that if the number of intermediate recrystallization treatments is three or less, the total elongation cannot be made 5% or more.

[0052] Also, from Table 1, it can be seen that the number of intermediate recrystallization treatments required differs depending on the wire diameter. Specifically, in the wire diameter range of 11 μm or more and 18 μm or less, when the number of intermediate recrystallization treatments is 8 or more, the total elongation of the metal wire is 5% or more. On the other hand, when the wire diameter is 35 μm, when the number of intermediate recrystallization treatments is 5 or more, the total elongation of the metal wire is 5% or more. From this point of view, it can be concluded that in order to obtain a metal wire with a fine wire diameter, it is necessary to increase the number of intermediate recrystallization treatments compared to the case of obtaining a metal wire with a thick wire diameter.

[0053] The recrystallization process refers to a process in which crystals are rearranged by heat treatment. The recrystallization process promotes the dispersion of solute elements such as Re or Ru, which contributes to an increase in the total elongation when the metal wire is thinned. In this way, the application of heat to the metal wire as a recrystallization process during the manufacturing process improves the dispersion of the alloying element (Re or Ru) in the metal wire. This makes it possible to suppress uneven distribution of the alloying element, thereby achieving both improved tensile strength and increased total elongation in a thin metal wire.

[0054] [Examples of metal wire usage] Next, an example of use of the metal wire according to the present embodiment will be described.

[0055] The metal wire according to the present embodiment can be used for various purposes. Fig. 3 is a perspective view showing a metal wire 1 according to the present embodiment and a metal mesh 10 woven using the metal wire 1.

[0056] 3, the manufactured metal wire 1 is generally stored wound around a bobbin (spool) 2. When a desired metal product is manufactured using the metal wire 1, the metal wire 1 is unwound from the bobbin 2 and used.

[0057] For example, the metal mesh 10 can be manufactured by weaving the metal wire 1 as at least one of the weft and warp threads. The metal mesh 10 is an example of a tungsten product having the metal wire 1, for example, a screen mesh used in screen printing. In this way, the metal wire 1 is used as a wire material for the screen mesh. The metal mesh 10 may be used not only as a screen mesh, but also as a high-performance filter or a medical device, for example.

[0058] [Bending property of metal wire] Next, the bendability of the metal wire will be described with reference to FIG. 4 and FIG.

[0059] Fig. 4 is a cross-sectional view of a metal mesh 10 woven using the metal wire 1 according to the present embodiment. As shown in Fig. 4, in the metal mesh 10, the metal wires 1 woven as warp and weft threads are in a bent state. For this reason, the metal wires 1 are required to be able to withstand bending with a predetermined curvature or more.

[0060] The inventors of the present application conducted a coiling test to confirm the bendability of the metal wire 1. The contents of the coiling test and the results thereof will be described below.

[0061] 5 is a diagram showing an outline of a coiling test of the metal wire 1 according to the embodiment. In the coiling test, the metal wire 1 was wound around a rod-shaped core material 20 having a circular cross-sectional shape and a uniform diameter, and it was confirmed whether or not the metal wire 1 broke or had its surface peeled off. The cross-sectional diameter R of the core material 20 and the diameter φ of the metal wire 1 used in the coiling test are determined according to the specifications of the metal mesh 10 to be manufactured.

[0062] As an example of the metal mesh 10 to be manufactured, a case where a 900-mesh metal mesh is manufactured using metal wires 1 with a diameter of 12 μm is assumed. Note that the mesh (number of meshes) here means the number of wires per 25.4 mm (1 inch). In this case, the pitch, which is the distance between two adjacent metal wires 1, is 28.2 μm (= 25.4 mm ÷ 900).

[0063] In this case, as shown in FIG. 4, the radius of curvature Rc of the metal wire 1 is 19.6 μm. The radius of curvature Rc is defined based on the central axis of the metal wire 1 (broken line in the figure). The inner radius of curvature Ri of the metal wire 1 is 13.6 μm. The inner radius of curvature Ri is defined based on the inner surface of the bend of the metal wire 1. In other words, when the radius of curvature Rc is 19.6 μm or less and the inner radius of curvature Ri is 13.6 μm or less, the metal wire 1 can be used as the warp and weft threads of the metal mesh 10 as long as the metal wire 1 does not break and does not experience surface peeling.

[0064] The coiling test was performed under conditions exceeding the limit at which a metal mesh can be woven. If the coiling test performed under conditions exceeding the limit at which a metal mesh can be woven did not cause breakage (disconnection) or surface peeling of the metal wire 1, the metal mesh 10 can be stably manufactured using the metal wire 1 used in the test.

[0065] For example, the condition for metal wires 1 with a diameter of 12 μm to come into contact with each other is the case of 1222 meshes. In other words, it is not possible to manufacture a metal mesh with a mesh number greater than 1222 meshes. As a condition for the coiling test, a metal wire 1 of 12 μm and a metal mesh 10 of 1324 meshes are assumed.

[0066] In addition, since breakage of the metal wire 1 occurs due to distortion of the material that constitutes the metal wire 1, it can be considered using metal wires 1 with different wire diameters. For example, if the condition of 12 μm and 1324 mesh is converted to a metal wire 1 of 35 μm, it becomes 454 mesh (= 1324 mesh × 12 μm ÷ 35 μm). Under this condition, the radius of curvature Rc is 31 μm, and the inner radius of curvature Ri is 13.5 μm.

[0067] In the coiling test, the inventors used a core material 20 with a diameter R of 27 μm and a metal wire 1 with a diameter φ of 35 μm. The metal wire 1 wound around this core material 20 has an inner radius of curvature Ri of 13.5 μm (=R÷2) and a radius of curvature Rc of 31.0 μm (=Ri+φ÷2). Therefore, if no breakage or surface peeling occurs in the coiling test under these conditions, it means that a 900-mesh metal mesh 10 can be manufactured using a metal wire 1 with a diameter of 12 μm.

[0068] Table 3 below shows the results of the coiling test for Comparative Examples 9 and 10 and Example 16. The wire diameter in each case was 35 μm, the alloying element as the additive was Re, and the amount of additive was 5 wt %. In each case, the intermediate recrystallization treatment was performed six times.

[0069] [Table 3]

[0070] Fig. 6A is a diagram showing the appearance of the metal wire according to Example 16 after the coiling test. Fig. 6B is a diagram showing an enlarged portion of Fig. 6A. As shown in Fig. 6A and Fig. 6B, in Example 16, there was no breakage of the metal wire and no surface peeling occurred.

[0071] Fig. 7A is a diagram showing the appearance of the metal wire according to Comparative Example 10 after the coiling test. Fig. 7B is a diagram showing an enlarged portion of Fig. 7A. As shown in Figs. 7A and 7B, in Comparative Example 10, the metal wire did not break, but slight surface peeling occurred. Therefore, even if the total elongation is 4%, it is possible to manufacture a metal mesh 10, but to manufacture a higher quality metal mesh 10, it is desirable that the total elongation be 5% or more.

[0072] The wire diameter of the metal wire and the mesh pitch are not limited to the above examples.

[0073] [Effects, etc.] As described above, the metal wire according to the present embodiment has a total elongation of 5% or more and 16% or less, a tensile strength of 1600 MPa or more and 2400 MPa or less, and a wire diameter of less than 40 μm. In addition, for example, the metal wire may be used as a warp or weft of a mesh.

[0074] In this way, a metal wire that is thin, has great elongation, and has high tensile strength can be realized. In particular, when used as warp and weft threads of a mesh, the metal wire is thin, so a fine mesh can be formed. When this mesh is used as a screen mesh, high-resolution printing can be performed. Furthermore, since the metal wire has great elongation, breakage during weaving using the metal wire as warp and weft threads is suppressed. Furthermore, breakage during use of the woven metal mesh 10 can also be suppressed.

[0075] In addition, a metal mesh woven using metal wires with high tensile strength as warp and weft threads can be prevented from breaking during use and can be made durable. For example, when the metal mesh is used as a screen mesh, it can withstand pressure from a squeegee. Thus, the mesh woven using the metal wires according to the present embodiment is durable and can be printed with high resolution.

[0076] Also, for example, the metal wire is an alloy wire made of an alloy of tungsten and at least one metal element different from tungsten. Also, for example, the at least one metal element is an element included in Group 7 or Group 8. Also, for example, the at least one metal element is rhenium or ruthenium.

[0077] This allows the alloying elements to be dispersed evenly within the metal wire, thereby making it possible to increase elongation while maintaining a high tensile strength.

[0078] Also, for example, the metal wire will not break even if it is bent to a predetermined value, such as a radius of curvature of 13.6 μm or less, the predetermined value being, for example, 13.5 μm.

[0079] This allows for the stable production of metal mesh equivalent to 900 mesh.

[0080] For example, the wire diameter of the metal wire may be 18 μm or less.

[0081] This allows, for example, the production of finer meshes using metal wires, and when used as a screen mesh, allows for higher definition printing.

[0082] (others) Although the metal wire according to the present invention has been described based on the above embodiment, the present invention is not limited to the above embodiment.

[0083] For example, the alloying element may be a Group 7 element other than rhenium (e.g., technetium (Tc)), a Group 8 element other than ruthenium (e.g., osmium (Os)), or an element different from Group 7 or Group 8 (e.g., iridium (Ir)).

[0084] For example, the metal wire may be used for purposes other than mesh. For example, the metal wire may be used as a single thread of a twisted yarn such as a doubled yarn or a covering yarn. Alternatively, the metal wire may be used for a filament coil or the like. It can be used for various tungsten products that take advantage of the characteristics of tungsten such as a high melting point and high hardness.

[0085] Furthermore, for example, one aspect of the present invention may be a method for manufacturing a metal wire having the above-described characteristics.

[0086] In addition, the present invention also includes forms obtained by applying various modifications to each embodiment that a person skilled in the art may think of, and forms realized by arbitrarily combining the components and functions of each embodiment within the scope that does not deviate from the spirit of the present invention. [Explanation of symbols]

[0087] 1 Metal Wire 10 Metal Mesh

Claims

1. The total elongation is greater than 5% and less than or equal to 16%; The tensile strength is 1600 MPa or more and 2400 MPa or less, The wire diameter is less than 40 μm, An alloy wire made of an alloy of tungsten and rhenium or ruthenium, When rhenium is contained, the content of rhenium is 0.1 wt % or more and 10 wt % or less, and when ruthenium is contained, the content of ruthenium is 0.05 wt % or more and 0.3 wt % or less. Metal wire.

2. The metal wire will not break even if it is bent to a predetermined value having a radius of curvature of 13.6 μm or less. The metal wire of claim 1 .

3. The wire diameter is 18 μm or less.

3. The metal wire according to claim 1 or 2.

4. The metal wire is used as a warp or weft of the mesh. The metal wire according to any one of claims 1 to 3.

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