Alloy wire rod, its manufacturing method and uses

Abstract

The present invention relates to the technical field of tungsten alloy materials, particularly to an alloy wire and its manufacturing method and use. The alloy wire is made of a tungsten alloy, the tungsten alloy containing tungsten and lanthanum oxide, the wire diameter of the alloy wire is 100 μm or less, and the tensile strength of the alloy wire is 3800 MPa or more. The wire diameter of the alloy wire is 60 μm or less, and the push-pull core wire diameter of the alloy wire is 350 μm or less. The ultimate elastic strength of the alloy wire is 2500 MPa or more, and the tensile strength of the alloy wire is 4200 MPa or more. In the present invention, by doping with lanthanum oxide, an alloy wire with ultra-high strength and excellent toughness can be obtained.

Description

[Technical Field]

[0001] The present invention relates to the technical field of tungsten alloy materials, and more particularly to an alloy wire and its manufacturing method and application. [Background technology]

[0002] High-carbon steel wire and tungsten wire are known as materials with a certain degree of strength and hardness. However, the tensile strength of conventional high-carbon steel wire is generally less than 4500 MPa, and its diameter exceeds 50 μm, reaching the processing limit and making it impossible to process it into smaller diameters.

[0003] Tungsten also has excellent flexibility at bend radii of less than 1 mm, whereas stainless steel wire may fail at similarly small bend radii due to repeated bending stress. Also, 316 stainless steel generally melts at temperatures between 2500 and 2550°F, while tungsten melts at temperatures reaching 6192°F. Therefore, tungsten performs well in mechanical wire rope applications where excellent heat resistance and tensile strength are required.

[0004] At the same time, tungsten's dual advantages of long life and flexibility have made it a popular material for medical and industrial micromechanical wire ropes. Tungsten's toughness, flexibility, and heat resistance make tungsten wire ropes strong and durable, requiring no maintenance or replacement for extended periods. Tungsten is one of the toughest materials known today. Diamond has a Mohs hardness of 10, tungsten has a Mohs hardness of 9, and stainless steel has a Mohs hardness of approximately 6.

[0005] The tensile strength of ordinary tungsten wire is generally below 4000 MPa. However, its poor toughness, complicated manufacturing process, and extremely difficult processing make it difficult to mass-produce effectively. High-strength, high-toughness wire suitable for mass production, exceeding 4500 MPa, is yet to be found on the market. For example, wire with higher strength, toughness, and fineness is required to meet the various needs of various practical applications, such as cutting high-hardness materials such as semiconductor materials sapphire, silicon carbide, silicon wafers, and magnetic materials, as well as cables and ropes used in pulling high-precision instruments and high-temperature furnaces. Summary of the Invention [Problem to be solved by the invention]

[0006] In order to solve the problem that the performance of the conventional high-strength tungsten alloy wire is insufficient due to different sizes, the present invention provides an alloy wire, which is made of a tungsten alloy, and the tungsten alloy contains tungsten and lanthanum oxide, and the diameter of the alloy wire is less than 100 μm, and the tensile strength of the alloy wire is more than 3800 MPa.

[0007] The content of lanthanum oxide in the alloy wire is 0.1% by weight to 2.0% by weight.

[0008] The alloy wire has a wire diameter of 60 μm or less, and a push-pull core wire diameter of the alloy wire is 350 μm or less.

[0009] The ultimate elastic strength of the alloy wire is 2500 MPa or more, and the tensile strength of the alloy wire is 4200 MPa or more.

[0010] The tungsten alloy further contains a metal element M, and the metal element M is at least one selected from potassium, rhenium, molybdenum, iron, cobalt, and rare earth metals.

[0011] Furthermore, the potassium content is less than 80 ppm.

[0012] Furthermore, the tungsten alloy further includes one or more rare earth oxides in addition to the oxide of lanthanum.

[0013] The present invention provides a method for producing such alloy wire, which includes the steps of powder doping, pressing, sintering, and blooming.

[0014] In the blooming process, sintered billets are produced by multi-roll rolling. To The tungsten rod is then subjected to blooming, and after the rolling, the ratio of the length of the lanthanum oxide granules in the longitudinal direction of the wire material to the particle size in the cross section of the granule is greater than 5.

[0015] Furthermore, the powder doping process includes the following steps:

[0016] Solid-liquid doping process, reduction process, powder production process.

[0017] The solid-liquid doping process includes a stepwise drying process for the mixed tungsten doping solution, and the stepwise drying process includes at least two temperature stages, the two temperature stages being divided into two stages, with 100°C as the dividing line, in which the first stage is heated and dried at a temperature below 100°C, and the second stage is heated and dried at a temperature above 100°C.

[0018] Furthermore, the stepwise drying process in the solid-liquid doping includes a first drying stage and a second drying stage, the temperature of the first drying stage is 60 to 80°C, and the temperature of the second drying stage is 110 to 150°C.

[0019] Furthermore, the reduction step includes a step of reducing the material produced in the solid-liquid doping step into alloy powder having an average Fischer particle size of 1.0 to 4.0 μm.

[0020] Furthermore, the powder doping process includes the following steps:

[0021] [Solid-state and solid-state doping processes] The solid-solid doping process includes mixing tungsten powder having a Fischer particle size of 1.0 μm to 4.0 μm and lanthanum oxide having a particle size distribution D90<2.0 μm as raw materials to obtain tungsten powder doped with lanthanum oxide.

[0022] Furthermore, the sintered billet To The particle size of the lanthanum oxide is 2.5 μm or less.

[0023] The present invention provides an alloy wire for use in the field of material cutting.

[0024] As the alloy material, the above-mentioned alloy wire or the alloy wire manufactured by the above-mentioned method for manufacturing the alloy wire is used.

[0025] Furthermore, the material includes at least a hard surface material, the hard surface material includes at least a silicon wafer, a magnetic material, and a semiconductor material, and the semiconductor material includes at least sapphire and silicon carbide.

[0026] The present invention provides an alloy wire for use in cables / ropes.

[0027] As the alloy material, the above-mentioned alloy wire or the alloy wire manufactured by the above-mentioned method for manufacturing the alloy wire is used.

[0028] Furthermore, the cables / ropes are used to pull medical / industrial precision instruments and high temperature furnaces.

[0029] The present invention provides an alloy wire for use in textiles.

[0030] As the alloy material, the above-mentioned alloy wire or the alloy wire manufactured by the above-mentioned method for manufacturing the alloy wire is used.

[0031] Furthermore, gloves and protective clothing made from the alloy wire by spinning or weaving are also included.

[0032] The alloy wire rod of the present invention, and the manufacturing method and application thereof, have the following beneficial technical effects compared to the prior art.

[0033] 1. The wire diameter is 100 μm or less, and the tensile strength is 3800 MPa or more.

[0034] 2. The wire diameter of the alloy wire is 60 μm or less, the wire diameter of the push-pull core of the alloy wire is 350 μm or less, the ultimate elastic strength of the alloy wire is 2500 MPa or more, and the tensile strength of the alloy wire is 4200 MPa or more. [Brief explanation of the drawings]

[0035] In order to more clearly explain the configuration of the embodiments of the present invention or the prior art, the drawings used in the embodiments or the prior art will be briefly described below. In addition, the drawings described below are the embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

[0036] [Figure 1] FIG. 1 is a diagram showing the configuration of a push-pull type toughness testing device according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0037] In order to clarify the purpose, configuration and advantages of the embodiments of the present invention, the configuration of the embodiments of the present invention will be clearly and completely described below with reference to the drawings. It is clear that the embodiments described below are only some of the embodiments of the present invention, and do not represent all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative labor fall within the scope of protection of the present invention.

[0038] The present invention provides an alloy wire, which is made of a tungsten alloy, and the tungsten alloy includes tungsten and a rare earth oxide.

[0039] The alloy wire has a wire diameter of 400 μm or less.

[0040] The alloy wire has a tensile strength of 2800 MPa or more.

[0041] In some embodiments, the alloy wire has a wire diameter of 100 μm or less, and the alloy wire has a tensile strength of 3800 MPa or more.

[0042] In some embodiments, the alloy wire has a wire diameter of 60 μm or less, and the alloy wire has a push-pull core wire diameter of 350 μm or less.

[0043] The alloy wire has an elastic ultimate strength of 2500 MPa or more, and a tensile strength of 4200 MPa or more.

[0044] In some embodiments, the alloy wire has a wire diameter of 40 μm or less, and the alloy wire has a tensile strength of 4800 MPa or more.

[0045] In some embodiments, the alloy wire has a wire diameter of 25 μm or less, and the alloy wire has a tensile strength of 5000 MPa or more.

[0046] The alloy wire has a tensile strength of 2800 MPa or more. For example, the alloy wire may have a tensile strength of 3200 MPa or more, 3800 MPa or more, 4200 MPa or more, or even 4800 MPa or more or 5000 MPa or more.

[0047] The alloy wire has an ultimate elastic strength of 2500 MPa or more. For example, the ultimate elastic strength of the alloy wire may be 2700 MPa or more, 3000 MPa or more, or even 3200 MPa or more.

[0048] The diameter of the alloy wire is 400 μm or less. The diameter of the alloy wire is, for example, 400 μm, 350 μm, 300 μm, 250 μm, 200 μm, 150 μm, 100 μm, 80 μm, or even 60 μm, 40 μm, 25 μm, 20 μm, 10 μm, etc. The alloy wire may be homogeneous or may not be completely homogeneous, and may have a difference of, for example, 1% or several percent depending on the location.

[0049] In particular, the diameter of the alloy wire can be set to 60 μm or less, which makes the alloy wire flexible and easily bendable, allowing the alloy wire to be easily wound up.

[0050] Therefore, the wire diameter of the push-pull core of the alloy wire can reach 350 μm or less, for example, 230 μm, 200 μm, 180 μm, 160 μm, 130 μm, etc. It can be seen that the alloy wire has excellent push-pull toughness.

[0051] Specifically, the wire diameter of the alloy wire may be 200 μm to 400 μm, and the tensile strength of the alloy wire may be 2800 MPa to 4000 MPa, for example, 3000 MPa, or 3500 MPa, or even 4000 MPa.

[0052] The alloy wire may have a wire diameter of 100 to 200 μm and a tensile strength of 3200 to 4800 MPa, for example, 3400 MPa, 4000 MPa, 4500 MPa, or even 4800 MPa.

[0053] In some embodiments, the rare earth oxide is one or more selected from dysprosium oxide, erbium oxide, neodymium oxide, yttrium oxide, europium oxide, gadolinium oxide, lanthanum oxide, praseodymium oxide, holmium oxide, cerium oxide, terbium oxide, ytterbium oxide, samarium oxide, praseodymium oxide, thulium oxide, lutetium oxide, scandium oxide, and promethium oxide.

[0054] Specifically, for example, common rare earth oxides include dysprosium oxide (Dy2O3), erbium oxide (Er2O3), neodymium oxide (Nd2O3), yttrium oxide (Y2O3), europium oxide (Eu2O3), gadolinium oxide (Gd2O3), lanthanum oxide (La2O3), and praseodymium oxide (Pr6O 11 ), holmium oxide (Ho2O3), cerium oxide (CeO2), terbium oxide (Tb4O7), ytterbium oxide (Yb2O3), samarium oxide (Sm2O3), praseodymium oxide ((Pr+Nd) x O y ), thulium oxide (Tm2O3), lutetium oxide (Lu2O3), scandium oxide (Sc2O3), promethium oxide (Pm2O3), etc. In actual use, it can be one of the rare earth oxides such as lanthanum oxide (La2O3), yttrium oxide (Y2O3), cerium oxide (CeO2), scandium oxide (Sc2O3), etc., and lanthanum oxide (La2O3) and other rare earth oxides, such as scandium oxide (S The rare earth oxide may contain both lanthanum oxide (La2O3) and cerium oxide (CeO2), lanthanum oxide (La2O3) and yttrium oxide (Y2O3), lanthanum oxide (La2O3) and scandium oxide (Sc2O3), cerium oxide (CeO2) and yttrium oxide (Y2O3), etc., or may contain a combination of multiple other rare earth oxides, for example, both lanthanum oxide (La2O3) and cerium oxide (CeO2), lanthanum oxide (La2O3) and yttrium oxide (Y2O3), lanthanum oxide (La2O3) and scandium oxide (Sc2O3), cerium oxide (CeO2) and yttrium oxide (Y2O3), etc.

[0055] The rare earth oxides are distributed mainly at the grain boundaries of the tungsten main phase (matrix), with a small amount also distributed within the grains of the matrix, and the rare earth oxides are distributed in the form of lines or granular skewers.

[0056] The smaller the diameter of an alloy wire made of rare earth oxide and tungsten, the stronger its tensile strength becomes. In other words, an alloy wire made of rare earth oxide and tungsten can be used to realize saw wires, cables, etc. that are small in diameter but have high tensile strength.

[0057] The rare earth oxide may also be a rare earth-metal composite oxide such as YSZ or LSCO.

[0058] Furthermore, the tungsten alloy may contain trace amounts of carbides, other rare elements, metals, and non-metallic elements, for example, the carbides include TiC, ZrC, the other rare elements include Re etc., the non-metallic elements include C etc., and the metallic elements include potassium, rhenium, molybdenum, iron, cobalt etc.

[0059] The potassium content should be 80 ppm or less. Adding an appropriate amount of potassium can improve the high-temperature properties of the material, but if it is too much, it will affect workability and cause cracks and breaks.

[0060] In some embodiments, the tungsten content is 97.0 to 99.9 wt %, and the rare earth oxide content is 0.1 wt % to 3.0 wt %.

[0061] For example, the tungsten content may be 95 wt% or more, and preferably 97.0 wt% to 99.9 wt%, such as 97.5 wt%, 98 wt%, 98.5 wt%, 99 wt%, and 99.5 wt%.

[0062] For example, the content of the rare earth oxide is 0.1 wt% to 3.0 wt%, or 0.1 wt% to 2 wt%, or 0.1 wt% to 1 wt%, or 0.3 wt% to 0.8 wt%, and may be 0.1 wt%, 0.3 wt%, 0.5 wt%, 0.8 wt%, 1 wt%, 1.5 wt%, 2 wt%, etc. Increasing the content of the rare earth oxide can improve the performance of the alloy wire. However, if the content is too high, it becomes difficult to thin the alloy wire.

[0063] In some embodiments, the tungsten alloy further comprises a metal element, wherein the metal element is at least one of potassium, rhenium, molybdenum, iron, and cobalt.

[0064] In some embodiments, the potassium content is less than 80 ppm.

[0065] In some embodiments, the tungsten alloy further comprises carbon.

[0066] The present invention provides a method for producing the above-mentioned alloy wire, which comprises a powder doping step, a pressing step, a sintering step, and a blooming step. To The tungsten rod is then subjected to blooming, and after the rolling, the ratio of the length of the lanthanum oxide granules in the longitudinal direction of the wire material to the particle size in the cross section of the granule is greater than 5.

[0067] In some embodiments, the powder doping process comprises the following steps:

[0068] Solid-liquid doping process, reduction process, powder production process.

[0069] The solid-liquid doping process includes stepwise drying of the mixed tungsten dope solution, and the stepwise drying includes at least two temperature stages, with the boundary between the two temperature stages being 100°C, where first, heating and drying is performed at 100°C or less, and then heating and drying is performed at 100°C or more. For example, first, heating and drying is performed at 60°C to 80°C for 2 to 6 hours, and then heating and drying is performed at 110°C to 150°C for 3 to 5 hours.

[0070] In the stepwise heat drying, the material is first dried at a low temperature, then at a high temperature. For example, by drying at a temperature below 100°C, the rare earth salt particles slowly precipitate, increasing the number of crystal nuclei. By subsequently drying at a temperature above 100°C, the large number of rare earth salt particles does not have time to coalesce and grow, allowing for a significant reduction in particle size.

[0071] The stepwise drying includes at least two temperature stages, the two temperature stages being separated by 100°C, and the drying is first performed by heating at or below 100°C, and then by heating at or above 100°C.

[0072] In some embodiments, the stepwise drying in the solid-liquid doping comprises a first drying stage and a second drying stage, the temperature of the first drying stage is 60 to 80°C, and the temperature of the second drying stage is 110 to 150°C.

[0073] Within each of these two temperature stages separated by 100°C, heat drying may be performed at multiple temperature levels or stages. For example, drying may be performed at 60°C for 2 hours, followed by drying at 80°C for 2 hours, and then heating to 120°C for drying. Of course, the above-described examples are merely embodiments for carrying out the present invention, and those skilled in the art may further adjust or change the temperature stages within the scope of the present invention without departing from the technical spirit of the present invention, and these adjustments or changes fall within the scope of the present invention.

[0074] In some embodiments, the reduction includes reducing the material produced after solid-liquid doping into alloy powder in a reduction furnace.

[0075] In some embodiments, the alloy powder has an average particle size of 1.0 to 4.0 μm.

[0076] In some embodiments, the powder doping process comprises the following steps:

[0077] Liquid-liquid doping process, reduction process, powder production process.

[0078] The liquid-liquid doping process involves doping a solution of tungstic acid and / or tungstate with a solution of a soluble rare earth salt.

[0079] For example, liquid-liquid doping is performed using an ammonium metatungstate solution and a rare earth salt solution as raw materials to obtain blue tungsten powder doped with the rare earth salt.

[0080] In some embodiments, the powder doping process comprises the following steps:

[0081] Solid-state doping process.

[0082] In the solid-solid doping process, tungsten powder with a Fischer particle size of 1.0 μm to 4.0 μm and rare earth oxide with a particle size distribution D90<2.0 μm are mixed as raw materials to obtain tungsten powder doped with rare earth oxide.

[0083] In some embodiments, to ensure the size of the rare earth oxide particles, the solid-solid doping step involves removing coarse particles by precipitation in water to obtain fine particles of rare earth oxide.

[0084] By utilizing the characteristics that coarse particles settle quickly and fine particles settle slowly, rare earth oxides with D90<2μm can be obtained through three-stage precipitation with a settling time of 30 to 120 minutes.

[0085] In some embodiments, the rare earth oxide has a particle size distribution D90<2.0 μm.

[0086] In some embodiments, the sintered billet To The particle size of the rare earth oxide is 2.5 μm or less.

[0087] Furthermore, the following examples are preferred for the reduction step, powder production step, etc., but are not limited to these examples.

[0088] Reduction process: The doped materials by the solid-liquid and / or liquid-liquid methods are reduced to alloy powder in a four-temperature zone reduction furnace in one go.

[0089] Powder production process: The alloy powder obtained after reduction is mixed, and after mixing, the alloy powder with an average Fischer particle size of 1.0 to 4.0 μm is fed into a powder mixer. The powder is mixed at a speed of 6 to 10 rpm for 60 to 90 minutes.

[0090] Powder pressing: Powder with an average Fischer particle size of 1.0 μm to 4.0 μm is isostatically pressed under a pressure of 160 MPa to 260 MPa into a billet with a unit weight of 1.5 kg to 5.0 kg, and then pre-sintered in a hydrogen atmosphere. The pre-sintering temperature is preferably 1200 to 1400°C to increase the strength of the billet.

[0091] Sintering: Sintering is performed, the sintering temperature is preferably 1800 to 2400°C, the sintering time is preferably 5 to 15 hours, and the density is 17.5 to 18.5 g / cm 3 A sintered billet of 1000 MPa is obtained.

[0092] Blooming and rolling: Continuously roll using a multi-roller mill at a heating temperature of 1600-1700°C, and cut the sintered billet bar with a diameter of 15mm-25mm into alloy rods with a diameter of 8.0mm-12.0mm.

[0093] By using the multi-roller mill, it is ensured that the ratio of the length of the rare earth oxide particles along the longitudinal direction of the wire material to the particle size in the cross section of the granule is greater than 5 in the rolled tungsten rod.

[0094] Pressing process: After being rolled in a multi-stage rolling mill, the material is rotary forged multiple times, and then drawn through wire-drawing dies of different sizes. Through repeated drawing, alloy wire rods of different diameters are produced.

[0095] The alloy wire may then be subjected to a low-temperature stress relief annealing process at 1000°C or less to homogenize the stress distribution and improve the straightness. This process may be performed in a heating furnace or other equipment, and specifically, the alloy wire may be subjected to the low-temperature stress relief annealing process under the protection of hydrogen.

[0096] Furthermore, the drawn wire may be electrolytically polished and washed to smooth the surface. The electrolytic polishing step is carried out, for example, by impregnating the alloy wire and a counter electrode such as a carbon rod in an electrolytic solution and passing a current between the alloy wire and the counter electrode.

[0097] The alloy wire provided by the present invention is applied to the field of material cutting, and the alloy material is made from the above-mentioned alloy wire or the alloy wire made by the above-mentioned method for making the alloy wire.

[0098] In some embodiments, the material includes at least a hard surface material, the hard surface material includes at least a silicon wafer, a magnetic material, a semiconductor material, the semiconductor material includes at least sapphire, silicon carbide.

[0099] The alloy wire provided by the present invention is for application in the field of cables / ropes, and the alloy material is made from the above-mentioned alloy wire or the alloy wire made by the above-mentioned method for making the alloy wire.

[0100] In some embodiments, the cables / ropes are used to pull medical / industrial precision equipment and high temperature furnaces.

[0101] The alloy wire of the present invention is applied to the field of spinning, and the alloy material is made from the above-mentioned alloy wire or an alloy wire made by the above-mentioned method for making an alloy wire.

[0102] In some embodiments, the invention includes gloves or protective clothing made by spinning or knitting the alloy wire.

[0103] In order to clarify the purpose, configuration and advantages of the embodiments of the present invention, the configuration of the embodiments of the present invention will be clearly and completely described below with reference to the drawings. It is clear that the embodiments described below are only some of the embodiments of the present invention, and do not represent all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative labor fall within the scope of protection of the present invention.

[0104] One embodiment of the present invention provides an alloy wire, the alloy wire being made of a tungsten alloy, the tungsten alloy including an oxide of tungsten and lanthanum.

[0105] The content of the tungsten is 90 wt% or more, and the content of the lanthanum oxide is 0.1 wt% or more and 2.0 wt% or less.

[0106] For example, the tungsten content may be 95 wt% or more, preferably 97.0 wt% to 99.9 wt%, such as 97.5 wt%, 98 wt%, 98.5 wt%, 99 wt%, and 99.5 wt%.

[0107] Furthermore, for example, the content of the lanthanum oxide may be 0.1 wt% to 2 wt%, or 0.1 wt% to 1 wt%, or 0.3 wt% to 0.8 wt%, or may be 0.1 wt%, 0.3 wt%, 0.5 wt%, 0.8 wt%, 1 wt%, 1.5 wt%, 2 wt%, etc. Increasing the content of lanthanum oxide can improve the performance of the alloy wire. However, if the content of lanthanum oxide is greater than 2 wt%, it becomes difficult to thin the alloy wire.

[0108] In the alloy wire, the lanthanum oxide is distributed mainly at the grain boundaries of the tungsten main phase (parent phase), with a small amount also distributed within the grains of the parent phase, and the lanthanum oxide is distributed in a linear or granular skewer shape.

[0109] The smaller the wire diameter of an alloy wire made of lanthanum oxide and tungsten, the stronger its tensile strength becomes. In other words, an alloy wire made of lanthanum oxide and tungsten can be used to create saw wires and cables that are small in diameter but have high tensile strength.

[0110] The lanthanum oxide may be a lanthanum-metal composite oxide such as LSCO.

[0111] Furthermore, the tungsten alloy may contain trace amounts of carbides, other rare elements, metals, and non-metallic elements, for example, the carbides include TiC, ZrC, the other rare elements include rhenium, etc., the non-metallic elements include C, etc., and the metallic elements include potassium, molybdenum, iron, cobalt, etc.

[0112] The potassium content should be 80 ppm or less. Adding an appropriate amount of potassium can improve the high-temperature properties of the material, but if it is too much, it will affect workability and cause cracks and breaks.

[0113] In another embodiment of the present invention, an alloy wire is provided, the alloy wire being made of a tungsten alloy, the tungsten alloy including an oxide of tungsten and cerium.

[0114] The content of the tungsten is 90 wt% or more, and the content of the cerium oxide is 0.1 wt% or more and 1.5 wt% or less.

[0115] For example, the tungsten content may be 95 wt% or more, and preferably in the range of 97.0 wt% to 99.9 wt%, such as 97.5 wt%, 98 wt%, 98.5 wt%, 99 wt%, and 99.5 wt%.

[0116] Furthermore, for example, the content of the cerium oxide may be 0.2 wt% to 1.5 wt%, or 0.2 wt% to 1 wt%, or 0.3 wt% to 0.8 wt%, or may be 0.2 wt%, 0.3 wt%, 0.5 wt%, 0.8 wt%, 1 wt%, 1.5 wt%, etc. The cerium oxide is preferably cerium oxide (CeO). Increasing the cerium oxide content can improve the performance of the alloy wire. However, if the cerium oxide content is greater than 1.5 wt%, it becomes difficult to thin the alloy wire.

[0117] In another embodiment of the present invention, an alloy wire is provided, the alloy wire being made of a tungsten alloy, the tungsten alloy including an oxide of tungsten and yttrium.

[0118] The content of the tungsten is 90 wt% or more, and the content of the yttrium oxide is 0.1 wt% or more and 1.5 wt% or less.

[0119] For example, the tungsten content may be 95 wt% or more, and preferably in the range of 97.0 wt% to 99.9 wt%, such as 97.5 wt%, 98 wt%, 98.5 wt%, 99 wt%, and 99.5 wt%.

[0120] Furthermore, for example, the content of the yttrium oxide may be 0.2 wt% to 1.5 wt%, or 0.2 wt% to 1 wt%, or 0.3 wt% to 0.8 wt%, or may be 0.2 wt%, 0.3 wt%, 0.5 wt%, 0.8 wt%, 1 wt%, 1.5 wt%, etc. The yttrium oxide is preferably yttrium oxide (YO). Increasing the yttrium oxide content can improve the performance of the alloy wire. However, if the yttrium oxide content is greater than 1.5 wt%, it becomes difficult to thin the alloy wire.

[0121] The alloy wire has a tensile strength of 3800 MPa or more, and may be 4200 MPa or more, or may be 4800 MPa or more, or 5000 MPa or more.

[0122] The alloy wire has an ultimate elastic strength of 2500 MPa or more. For example, the ultimate elastic strength of the alloy wire may be 2700 MPa or more, 3000 MPa or more, or even 3200 MPa or more.

[0123] The diameter of the alloy wire is 100 μm or less. The diameter of the alloy wire is, for example, 100 μm, 80 μm, 60 μm, 40 μm, 25 μm, 20 μm, 10 μm, etc. The alloy wire may be homogeneous or may not be completely homogeneous, and may have a difference of, for example, 1% or several percent depending on the location.

[0124] In particular, the diameter of the alloy wire can be set to 60 μm or less, which makes the alloy wire flexible and easily bendable, allowing the alloy wire to be easily wound up.

[0125] Therefore, the wire diameter of the push-pull core of the alloy wire can reach 350 μm or less, for example, 230 μm, 200 μm, 180 μm, 160 μm, 130 μm, etc. It can be seen that the alloy wire has excellent push-pull toughness.

[0126] Specifically, for example, the wire diameter of the alloy wire is 100 μm or less, and the tensile strength of the alloy wire is 3800 MPa or more.

[0127] The wire diameter of the alloy wire is 60 μm or less, the tensile strength of the alloy wire is 4200 MPa or more, the ultimate elastic strength of the alloy wire is 2500 MPa or more, and the wire diameter of the push-pull core of the alloy wire is 350 μm or less, or even 180 μm or less.

[0128] The wire diameter of the alloy wire is 40 μm or less, the tensile strength of the alloy wire is 4800 MPa or more, the ultimate elastic strength of the alloy wire is 2700 MPa or more, and the wire diameter of the push-pull core of the alloy wire is 350 μm or less, or even 200 μm or less.

[0129] The wire diameter of the alloy wire is 25 μm or less, the tensile strength of the alloy wire is 5000 MPa or more, the ultimate elastic strength of the alloy wire is 3000 MPa or more, and the wire diameter of the push-pull core of the alloy wire is 350 μm or less, or even 250 μm or less.

[0130] The present invention provides a method for manufacturing an alloy wire.

[0131] The manufacturing method includes a powder doping step, a pressing step, a sintering step, a blooming step, and a pressure treatment step.

[0132] Doping, reduction, milling.

[0133] The powder doping process can be classified based on the treatment process, including solid-liquid method, liquid-liquid method, solid-solid method, etc.

[0134] Specifically, according to the solid-liquid method, the powder doping process includes the following steps:

[0135] Solid-liquid doping process, reduction process, powder production process.

[0136] In the solid-liquid doping step, an appropriate amount of a soluble lanthanum salt solution is doped into tungsten powder, and the doped solution is thoroughly stirred and then heated and dried in stages.

[0137] The stepwise heat drying involves first drying at a low temperature and then at a high temperature. That is, by drying at a temperature below 100°C, lanthanum salt particles slowly precipitate, increasing the number of crystal nuclei. By subsequently drying at a temperature above 100°C, the large number of lanthanum salt particles does not have time to coalesce and grow, allowing for a significant reduction in particle size.

[0138] The stepwise drying includes at least two temperature stages, with the boundary between the two temperature stages being 100°C, where first the drying is performed at 100°C or below, and then the drying is performed at 100°C or above. For example, the drying is performed at first at 60°C to 80°C for 2 to 6 hours, and then at 110°C to 150°C for 3 to 5 hours.

[0139] Within each of these two temperature stages separated by 100°C, heat drying may be performed at multiple temperature levels or stages. For example, drying may be performed at 60°C for 2 hours, followed by drying at 80°C for 2 hours, and then heating to 120°C for drying. Of course, the above-described examples are merely embodiments for carrying out the present invention, and those skilled in the art may further adjust or change the temperature stages within the scope of the present invention without departing from the technical spirit of the present invention, and these adjustments or changes fall within the scope of the present invention.

[0140] Furthermore, for example, an appropriate amount of lanthanum nitrate solution is uniformly mixed with blue tungsten powder, thoroughly stirred, and then heated at 60°C to 80°C for 2 to 6 hours, and then at 110°C to 150°C for 3 to 5 hours.

[0141] Specifically, according to the liquid-liquid method, the powder doping process includes the following steps:

[0142] Liquid-liquid doping process, reduction process, powder production process.

[0143] In the liquid-liquid doping process, a solution of tungstic acid and / or tungstate is doped with a solution of soluble lanthanum salt, which is then used to obtain tungsten powder doped with lanthanum salt.

[0144] For example, liquid-liquid doping can be performed using an ammonium metatungstate solution and a lanthanum salt solution as raw materials to obtain blue tungsten powder doped with lanthanum salt.

[0145] Specifically, according to the solid-solid method, the powder doping process includes the following steps: solid-solid doping process.

[0146] In the solid-solid doping process, tungsten powder with a Fischer particle size of 1.0 μm to 4.0 μm and lanthanum oxide with a particle size distribution D90<2.0 μm are used as raw materials, and solid-phase doping mixing is performed to obtain tungsten powder doped with lanthanum oxide.

[0147] Furthermore, to ensure the size of the lanthanum oxide particles, in the solid-solid doping process, coarse particles are removed by water precipitation to obtain fine lanthanum oxide particles.

[0148] Taking advantage of the fact that coarse particles settle quickly and fine particles settle slowly, lanthanum oxide with a D90<2μm can be obtained by three-stage precipitation with a settling time of 30 to 120 minutes.

[0149] Furthermore, the following examples are preferred for the reduction step, powder production step, and the like in the above steps, but are not limited to these examples.

[0150] Reduction process: The doped materials by the solid-liquid and / or liquid-liquid methods are reduced to alloy powder in a four-temperature zone reduction furnace in one go.

[0151] Powder production process: The alloy powder obtained after reduction is mixed, and after mixing, the alloy powder with an average Fischer particle size of 1.0 to 4.0 μm is fed into a powder mixer. The powder is mixed at a speed of 6 to 10 rpm for 60 to 90 minutes.

[0152] Powder pressing: Powder with an average Fischer particle size of 1.0 μm to 4.0 μm is isostatically pressed under a pressure of 160 MPa to 260 MPa into a billet with a unit weight of 1.5 kg to 5.0 kg, and then pre-sintered in a hydrogen atmosphere. The pre-sintering temperature is preferably 1200 to 1400°C to increase the strength of the billet.

[0153] Sintering: Sintering is performed, the sintering temperature is preferably 1800 to 2400°C, the sintering time is preferably 5 to 15 hours, and the density is 17.5 to 18.5 g / cm 3 A sintered billet of 1000 MPa is obtained.

[0154] Blooming and rolling: Continuously roll using a multi-roller mill at a heating temperature of 1600-1700°C, and cut the sintered billet bar with a diameter of 15mm-25mm into alloy rods with a diameter of 8.0mm-12.0mm.

[0155] By using the multi-roller mill, it is ensured that the ratio of the length of the lanthanum oxide particles along the longitudinal direction of the wire material to the particle size in the cross section of the granule is greater than 5 in the rolled tungsten rod.

[0156] Pressing process: After being rolled in a multi-stage rolling mill, the material is rotary forged multiple times, and then drawn through wire-drawing dies of different sizes. Through repeated drawing, alloy wire rods of different diameters are produced.

[0157] The alloy wire may then be subjected to a low-temperature stress relief annealing process at 1000°C or less to homogenize the stress distribution and improve the straightness. This process may be performed in a heating furnace or other equipment, and specifically, the alloy wire may be subjected to the low-temperature stress relief annealing process under the protection of hydrogen.

[0158] Furthermore, the drawn wire may be electrolytically polished and washed to smooth the surface. The electrolytic polishing step is carried out, for example, by impregnating the alloy wire and a counter electrode such as a carbon rod in an electrolytic solution and passing a current between the alloy wire and the counter electrode.

[0159] Compared with conventional tungsten alloy wire rods, the present invention has the following features and advantages:

[0160] First, when solid-liquid doping is used in the doping process of the present invention, drying is performed in stages, first at a low temperature (below 100°C) and then at a high temperature (above 100°C). Lanthanum nitrate particles are first precipitated slowly to increase the number of crystal nuclei, and then the large number of lanthanum nitrate particles are prevented from coalescing and growing. This drying method significantly reduces the particle size. By adjusting the drying temperature during doping, the lanthanum nitrate nucleation and precipitation rate can be controlled, resulting in smaller lanthanum nitrate crystals doped into the blue tungsten particles.

[0161] During solid-solid doping, coarse particles are removed by aqueous precipitation, and lanthanum oxide with a D90<2μm is obtained through three precipitation steps with precipitation times of 30-120 minutes, using fast precipitation of coarse particles and slow precipitation of fine particles.

[0162] As a result, the particle size of lanthanum oxide on the surface of the tungsten powder particles produced by the present invention and the particle size of lanthanum oxide on the surface of the sintered billet are both smaller than those produced by conventional methods, with the particle size of lanthanum oxide being less than 2.5 μm and more uniformly distributed, resulting in more stable product performance.

[0163] Second, the present invention uses multi-roll rolling to bloom the sintered billet, subjecting the alloy material to a large deformation at a speed of 2.5 meters per second or greater. Conventionally, tungsten rods and wires are subjected to blooming using rotary forging. However, the intense radial deformation caused by rotary forging can fracture the lanthanum oxide dispersed particles, resulting in holes in the gaps between the dispersed particles and the tungsten substrate. This processing method can lead to stress concentrations and defects in the material, making subsequent processing difficult. In the present invention, multiple rolls (three or four) are used to bloom the alloy material, which further develops the fibrous structure of the substrate during blooming, accelerating the longitudinal deformation rate. This results in greater deformation of the lanthanum oxide dispersed particles, reducing their cross-sectional size and increasing their axial length. This allows the tungsten substrate and dispersed particles to have good plasticity and toughness after blooming. During subsequent continuous forging, the dispersed particles further develop a fibrous reinforced structure, improving the strength and toughness of the tungsten wire.

[0164] The present invention provides the following examples and comparative examples.

[0165] Example 1.1 In the following examples, a high-strength, high-yield strength tungsten alloy wire is manufactured according to the present invention, and the material composition is 1 wt% La2O3 and 99 wt% W.

[0166] The manufacturing process is as follows.

[0167] Step 1, doping: A suitable amount of lanthanum nitrate solution is uniformly doped into the blue tungsten powder, and after thorough stirring, it is first dried at a low temperature of 80°C for 4 hours, and then dried at 120°C.

[0168] Step 2, reduction: The material obtained in step 1 is transferred to a four-temperature zone reduction furnace to reduce the doped powder into alloy powder with appropriate particle size in one go.

[0169] Step 3, Mixing: The materials obtained in step 2 are put into a mixer according to the composition of different particle sizes, and the powder is mixed at 8 rpm for 80 minutes.

[0170] Step 4, powder pressing: Using the isostatic pressing method, powders with different particle size compositions are pressed into a single 3.0 kg billet at a pressure of 200 MPa, and then pre-sintered at low temperature in a hydrogen atmosphere to increase the strength of the billet.

[0171] Step 5: High-temperature sintering: High-temperature sintering is performed, resulting in a density of 18.10 g / cm 3 A sintered billet of

[0172] Step 6, blooming: The sintered billet with a diameter of 23.0 mm is continuously rolled into an 8.0 mm alloy bar using a multi-roller mill at a heating temperature of 1650°C.

[0173] Step 7, Pressurization: Rotary forging is repeated multiple times, followed by wire drawing using wire drawing dies of different sizes, which is repeated several times to produce alloy wire rods with different diameters.

[0174] In addition, to ensure smooth multiple wire drawing processes, the tungsten wire is annealed to remove residual stress caused by plastic deformation.

[0175] Example 1.2 In the following examples, a high-strength and high-yield strength tungsten alloy wire is manufactured according to the present invention, and the material composition is 0.15 wt% La2O3 and 99.85 wt% W. The manufacturing process is as follows:

[0176] Step 1, doping: A suitable amount of lanthanum nitrate solution is uniformly doped into the blue tungsten powder, and after thorough stirring, it is first dried at a low temperature of 80°C for 4 hours, and then dried at 120°C.

[0177] Step 2, reduction: The material obtained in step 1 is transferred to a four-temperature zone reduction furnace to reduce the doped powder into alloy powder with appropriate particle size in one go.

[0178] Step 3, Mixing: The materials obtained in step 2 are put into a mixer according to the composition of different particle sizes, and the powder is mixed at 8 rpm for 80 minutes.

[0179] Step 4, powder pressing: Using the isostatic pressing method, powders with different particle size compositions are pressed into a single 3.0 kg billet at a pressure of 200 MPa, and then pre-sintered at low temperature in a hydrogen atmosphere to increase the strength of the billet.

[0180] Step 5: High-temperature sintering: High-temperature sintering is performed, resulting in a density of 18.10 g / cm 3 A sintered billet of

[0181] Step 6, blooming: The sintered billet with a diameter of 23.0 mm is continuously rolled into an 8.0 mm alloy bar using a multi-roller mill at a heating temperature of 1650°C.

[0182] Step 7, Pressurization: Rotary forging is repeated multiple times, followed by wire drawing using wire drawing dies of different sizes, which is repeated several times to produce alloy wire rods with different diameters.

[0183] In addition, to ensure smooth multiple wire drawing processes, the tungsten wire is annealed to remove residual stress caused by plastic deformation.

[0184] Example 1.3 In the following examples, a high-strength, high-yield strength tungsten alloy wire is manufactured according to the present invention, and the material composition is 1.5 wt% La2O3 and 98.5 wt% W.

[0185] The manufacturing process is as follows.

[0186] Step 1, doping: A suitable amount of lanthanum nitrate solution is uniformly doped into the blue tungsten powder, and after thorough stirring, it is first dried at a low temperature of 80°C for 4 hours, and then dried at 120°C.

[0187] Step 2, reduction: The material obtained in step 1 is transferred to a four-temperature zone reduction furnace to reduce the doped powder into alloy powder with appropriate particle size in one go.

[0188] Step 3, Mixing: The materials obtained in step 2 are put into a mixer according to the composition of different particle sizes, and the powder is mixed at 8 rpm for 80 minutes.

[0189] Step 4, powder pressing: Using the isostatic pressing method, powders with different particle size compositions are pressed into a single 3.0 kg billet at a pressure of 200 MPa, and then pre-sintered at low temperature in a hydrogen atmosphere to increase the strength of the billet.

[0190] Step 5: High-temperature sintering: High-temperature sintering is performed, resulting in a density of 18.10 g / cm 3 A sintered billet of

[0191] Step 6, blooming: The sintered billet with a diameter of 23.0 mm is continuously rolled into an 8.0 mm alloy bar using a multi-roller mill at a heating temperature of 1650°C.

[0192] Step 7, Pressurization: Rotary forging is repeated multiple times, followed by wire drawing using wire drawing dies of different sizes, which is repeated several times to produce alloy wire rods with different diameters.

[0193] In addition, to ensure smooth multiple wire drawing processes, the tungsten wire is annealed to remove residual stress caused by plastic deformation.

[0194] Example 1.4 In the following examples, a high-strength, high-yield strength tungsten alloy wire rod was manufactured according to the present invention, and the material composition was 1.8 wt% La2O3 and 98.2 wt% W.

[0195] The manufacturing process is as follows.

[0196] Step 1, doping: A suitable amount of lanthanum nitrate solution is uniformly doped into the blue tungsten powder, and after thorough stirring, it is first dried at a low temperature of 80°C for 4 hours, and then dried at 120°C.

[0197] Step 2, reduction: The material obtained in step 1 is transferred to a four-temperature zone reduction furnace to reduce the doped powder into alloy powder with appropriate particle size in one go.

[0198] Step 3, Mixing: The materials obtained in step 2 are put into a mixer according to the composition of different particle sizes, and the powder is mixed at 8 rpm for 80 minutes.

[0199] Step 4, powder pressing: Using the isostatic pressing method, powders with different particle size compositions are pressed into a single 3.0 kg billet at a pressure of 200 MPa, and then pre-sintered at low temperature in a hydrogen atmosphere to increase the strength of the billet.

[0200] Step 5: High-temperature sintering: High-temperature sintering is performed, resulting in a density of 18.10 g / cm 3 A sintered billet of

[0201] Step 6, blooming: The sintered billet with a diameter of 23.0 mm is continuously rolled into an 8.0 mm alloy bar using a multi-roller mill at a heating temperature of 1650°C.

[0202] Step 7, Pressurization: Rotary forging is repeated multiple times, followed by wire drawing using wire drawing dies of different sizes, which is repeated several times to produce alloy wire rods with different diameters.

[0203] In addition, to ensure smooth multiple wire drawing processes, the tungsten wire is annealed to remove residual stress caused by plastic deformation.

[0204] Example 1.5 In the following examples, a high-strength, high-yield strength tungsten alloy wire is manufactured according to the present invention, and the material composition is 1 wt% La2O3, 50 ppm K, and other components are W.

[0205] The manufacturing process is as follows.

[0206] Step 1, doping: A suitable amount of lanthanum nitrate solution is uniformly doped into potassium-doped tungsten powder with a potassium content of 50 ppm. After thorough stirring, the powder is first dried at a low temperature of 80°C for 4 hours, and then dried at 120°C.

[0207] Step 2, reduction: The material obtained in step 1 is transferred to a four-temperature zone reduction furnace to reduce the doped powder into alloy powder with appropriate particle size in one go.

[0208] Step 3, Mixing: The materials obtained in step 2 are put into a mixer according to the composition of different particle sizes, and the powder is mixed at 8 rpm for 80 minutes.

[0209] Step 4, powder pressing: Using the isostatic pressing method, powders with different particle size compositions are pressed into a single 3.0 kg billet at a pressure of 200 MPa, and then pre-sintered at low temperature in a hydrogen atmosphere to increase the strength of the billet.

[0210] Step 5: High-temperature sintering: High-temperature sintering is performed, resulting in a density of 18.10 g / cm 3 A sintered billet of

[0211] Step 6, blooming: The sintered billet with a diameter of 23.0 mm is continuously rolled into an 8.0 mm alloy bar using a multi-roller mill at a heating temperature of 1650°C.

[0212] Step 7, Pressurization: Rotary forging is repeated multiple times, followed by wire drawing using wire drawing dies of different sizes, which is repeated several times to produce alloy wire rods with different diameters.

[0213] In addition, to ensure smooth multiple wire drawing processes, the tungsten wire is annealed to remove residual stress caused by plastic deformation.

[0214] Example 1.6 In the following examples, a high-strength, high-yield strength tungsten alloy wire is manufactured according to the present invention, and the material composition is La2O3 1wt%, Y2O3 0.2wt%, and W 98.8wt%.

[0215] The manufacturing process is as follows.

[0216] Step 1, doping: The blue tungsten powder is uniformly doped with an appropriate amount of lanthanum nitrate solution and yttrium nitrate solution. After thorough stirring, the powder is first dried at a low temperature of 80°C for 4 hours, and then dried at 120°C.

[0217] Step 2, reduction: The material obtained in step 1 is transferred to a four-temperature zone reduction furnace to reduce the doped powder into alloy powder with appropriate particle size in one go.

[0218] Step 3, Mixing: The materials obtained in step 2 are put into a mixer according to the composition of different particle sizes, and the powder is mixed at 8 rpm for 80 minutes.

[0219] Step 4, powder pressing: Using the isostatic pressing method, powders with different particle size compositions are pressed into a single 3.0 kg billet at a pressure of 200 MPa, and then pre-sintered at low temperature in a hydrogen atmosphere to increase the strength of the billet.

[0220] Step 5: High-temperature sintering: High-temperature sintering is performed, resulting in a density of 18.10 g / cm 3 A sintered billet of

[0221] Step 6, blooming: The sintered billet with a diameter of 23.0 mm is continuously rolled into an 8.0 mm alloy bar using a multi-roller mill at a heating temperature of 1650°C.

[0222] Step 7, Pressurization: Rotary forging is repeated multiple times, followed by wire drawing using wire drawing dies of different sizes, which is repeated several times to produce alloy wire rods with different diameters.

[0223] In addition, to ensure smooth multiple wire drawing processes, the tungsten wire is annealed to remove residual stress caused by plastic deformation.

[0224] [Comparative Example 1.1] The following comparative example is a tungsten alloy wire manufactured by a conventional method, and the material composition is the same as that of Example 1, with La2O3 being 1 wt% and W being 99 wt%.

[0225] The manufacturing process is as follows.

[0226] Step 1, doping: A suitable amount of lanthanum nitrate solution is uniformly doped into the blue tungsten powder, and after thorough stirring, it is steam-dried at a temperature of 120°C for 4 hours.

[0227] Step 2, reduction: The material obtained in step 1 is transferred to a four-temperature zone reduction furnace to reduce the doped powder into alloy powder with appropriate particle size in one go.

[0228] Step 3, Mixing: The materials obtained in step 2 are put into a mixer according to the composition of different particle sizes, and the powder is mixed at 8 rpm for 80 minutes.

[0229] Step 4, powder pressing: Using the isostatic pressing method, powders with different particle size compositions are pressed into a single 3.0 kg billet at a pressure of 200 MPa, and then pre-sintered at low temperature in a hydrogen atmosphere to increase the strength of the billet.

[0230] Step 5: High-temperature sintering: High-temperature sintering is performed, resulting in a density of 18.10 g / cm 3 A sintered billet of

[0231] Step 6, Blooming: Continuously roll the 23.0 mm diameter sintered billet into an 8.0 mm diameter alloy bar using multiple rotary forgings.

[0232] Step 7, pressing: Through multiple rotary forgings and drawing processes using different size wire drawing dies, alloy wire rods with different diameters can be produced by repeated drawing.

[0233] In addition, to ensure smooth multiple wire drawing processes, the tungsten wire is annealed to remove residual stress caused by plastic deformation.

[0234] [Comparative Example 1.2] In the following comparative example, a high-strength, high-yield strength tungsten alloy wire was manufactured according to the present invention, and the material composition was 1 wt% La2O3 and 99 wt% W.

[0235] The manufacturing process is as follows.

[0236] Step 1, doping: A suitable amount of lanthanum nitrate solution is uniformly doped into the blue tungsten powder, and after thorough stirring, it is steam-dried at a temperature of 120°C for 4 hours.

[0237] Step 2, reduction: The material obtained in step 1 is transferred to a four-temperature zone reduction furnace to reduce the doped powder into alloy powder with appropriate particle size in one go.

[0238] Step 3, Mixing: The materials obtained in step 2 are put into a mixer according to the composition of different particle sizes, and the powder is mixed at 8 rpm for 80 minutes.

[0239] Step 4, powder pressing: Using the isostatic pressing method, powders with different particle size compositions are pressed into a single 3.0 kg billet at a pressure of 200 MPa, and then pre-sintered at low temperature in a hydrogen atmosphere to increase the strength of the billet.

[0240] Step 5: High-temperature sintering: High-temperature sintering is performed, resulting in a density of 18.10 g / cm 3 A sintered billet of

[0241] Step 6, blooming: The sintered billet with a diameter of 23.0 mm is continuously rolled into an 8.0 mm alloy bar using a multi-roller mill at a heating temperature of 1650°C.

[0242] Step 7, Pressurization: Rotary forging is repeated multiple times, followed by wire drawing using wire drawing dies of different sizes, which is repeated several times to produce alloy wire rods with different diameters.

[0243] In addition, to ensure smooth multiple wire drawing processes, the tungsten wire is annealed to remove residual stress caused by plastic deformation.

[0244] [Comparative Example 1.3] In the following comparative example, a high-strength, high-yield strength tungsten alloy wire was manufactured according to the present invention, and the material composition was 1 wt% La2O3 and 99 wt% W.

[0245] The manufacturing process is as follows.

[0246] Step 1, doping: A suitable amount of lanthanum nitrate solution is uniformly doped into the blue tungsten powder, and after thorough stirring, it is first dried at a low temperature of 80°C for 4 hours, and then dried at 120°C.

[0247] Step 2, reduction: The material obtained in step 1 is transferred to a four-temperature zone reduction furnace to reduce the doped powder into alloy powder with appropriate particle size in one go.

[0248] Step 3, Mixing: The materials obtained in step 2 are put into a mixer according to the composition of different particle sizes, and the powder is mixed at 8 rpm for 80 minutes.

[0249] Step 4, powder pressing: Using the isostatic pressing method, powders with different particle size compositions are pressed into a single 3.0 kg billet at a pressure of 200 MPa, and then pre-sintered at low temperature in a hydrogen atmosphere to increase the strength of the billet.

[0250] Step 5: High-temperature sintering: High-temperature sintering is performed, resulting in a density of 18.10 g / cm 3 A sintered billet of

[0251] Step 6, Blooming: Continuously roll the 23.0 mm diameter sintered billet into an 8.0 mm diameter alloy bar using multiple rotary forgings.

[0252] Step 7, pressing: Through multiple rotary forgings and drawing processes using different size wire drawing dies, alloy wire rods with different diameters can be produced by repeated drawing.

[0253] In addition, to ensure smooth multiple wire drawing processes, the tungsten wire is annealed to remove residual stress caused by plastic deformation.

[0254] [Comparative Example 1.4] In the following comparative example, a high-strength, high-yield strength tungsten alloy wire was manufactured according to the present invention, and the material composition was 0.07 wt% La2O3 and 99.93 wt% W.

[0255] The manufacturing process is as follows.

[0256] Step 1, doping: A suitable amount of lanthanum nitrate solution is uniformly doped into the blue tungsten powder, and after thorough stirring, it is first dried at a low temperature of 80°C for 4 hours, and then dried at 120°C.

[0257] Step 2, reduction: The material obtained in step 1 is transferred to a four-temperature zone reduction furnace to reduce the doped powder into alloy powder with appropriate particle size in one go.

[0258] Step 3, Mixing: The materials obtained in step 2 are put into a mixer according to the composition of different particle sizes, and the powder is mixed at 8 rpm for 80 minutes.

[0259] Step 4, powder pressing: Using the isostatic pressing method, powders with different particle size compositions are pressed into a single 3.0 kg billet at a pressure of 200 MPa, and then pre-sintered at low temperature in a hydrogen atmosphere to increase the strength of the billet.

[0260] Step 5: High-temperature sintering: High-temperature sintering results in a density of 18.10 g / cm 3 A sintered billet of 1000 MPa is obtained.

[0261] Step 6, blooming: The sintered billet with a diameter of 23.0 mm is continuously rolled into an 8.0 mm alloy bar using a multi-roller mill at a heating temperature of 1650°C.

[0262] Step 7, Pressurization: Rotary forging is repeated multiple times, followed by wire drawing using wire drawing dies of different sizes, which is repeated several times to produce alloy wire rods with different diameters.

[0263] In addition, to ensure smooth multiple wire drawing processes, the tungsten wire is annealed to remove residual stress caused by plastic deformation.

[0264] [Comparative Example 1.5] In the following comparative example, a high-strength, high-yield strength tungsten alloy wire was manufactured according to the present invention, and the material composition was 2.2 wt% La2O3 and 97.8 wt% W.

[0265] The manufacturing process is as follows.

[0266] Step 1, doping: A suitable amount of lanthanum nitrate solution is uniformly doped into the blue tungsten powder, and after thorough stirring, it is first dried at a low temperature of 80°C for 4 hours, and then dried at 120°C.

[0267] Step 2, reduction: The material obtained in step 1 is transferred to a four-temperature zone reduction furnace to reduce the doped powder into alloy powder with appropriate particle size in one go.

[0268] Step 3, Mixing: The materials obtained in step 2 are put into a mixer according to the composition of different particle sizes, and the powder is mixed at 8 rpm for 80 minutes.

[0269] Step 4, powder pressing: Using the isostatic pressing method, powders with different particle size compositions are pressed into a single 3.0 kg billet at a pressure of 200 MPa, and then pre-sintered at low temperature in a hydrogen atmosphere to increase the strength of the billet.

[0270] Step 5: High-temperature sintering: High-temperature sintering is performed, resulting in a density of 18.10 g / cm 3 A sintered billet of

[0271] Step 6, blooming: The sintered billet with a diameter of 23.0 mm is continuously rolled into an 8.0 mm alloy bar using a multi-roller mill at a heating temperature of 1650°C.

[0272] Step 7, Pressurization: Rotary forging is repeated multiple times, followed by wire drawing using wire drawing dies of different sizes, which is repeated several times to produce alloy wire rods with different diameters.

[0273] In addition, to ensure smooth multiple wire drawing processes, the tungsten wire is annealed to remove residual stress caused by plastic deformation.

[0274] Example 2.1 In the following examples, a high-strength, high-yield strength tungsten alloy wire is manufactured according to the present invention, and the material composition is 1 wt% La2O3 and 99 wt% W.

[0275] The manufacturing process is as follows.

[0276] Step 1: Solid-state doping: Add lanthanum oxide powder to the aqueous solution and stir for 5 minutes. Then pour the upper layer into the secondary sink and stir for another 5 minutes. After 10 minutes of settling, pour the upper layer into the tertiary sink and stir for another 5 minutes. Allow to settle for 30 minutes. Then pour the upper layer into the quaternary sink and allow to settle for 24 hours. After filtering the solution, heat it to 100°C for 24 hours to obtain lanthanum oxide powder with a D90<2.0μm. The tungsten powder with an average particle size of 2.0μm was mixed with an appropriate amount of aqueously precipitated lanthanum oxide powder with a D90<2.0μm in a powder mixer for 60 minutes to homogenize.

[0277] Step 2, powder pressing: Using the isostatic pressing method, powders with different particle size compositions are pressed into a single 3.0 kg billet at a pressure of 200 MPa, and then pre-sintered at low temperature in a hydrogen atmosphere to increase the strength of the billet.

[0278] Step 3: High-temperature sintering: High-temperature sintering is performed, resulting in a density of 18.10 g / cm 3 A sintered billet of

[0279] Step 4, blooming: Using a multi-roller mill, the sintered billet with a diameter of 23.0 mm is continuously rolled into an 8.0 mm alloy bar at a heating temperature of 1650°C.

[0280] Step 5, Pressurization: Rotary forging is repeated multiple times, followed by wire drawing using wire drawing dies of different sizes, which is repeated several times to produce alloy wire rods with different diameters.

[0281] In addition, to ensure smooth multiple wire drawing processes, the tungsten wire is annealed to remove residual stress caused by plastic deformation.

[0282] [Comparative Example 2.1] In the following comparative example, a high-strength, high-yield strength tungsten alloy wire was manufactured according to the present invention, and the material composition was 1 wt% La2O3 and 99 wt% W.

[0283] The manufacturing process is as follows.

[0284] Step 1, solid-state doping: Tungsten powder with an average particle size of 2.0 μm was mixed with an appropriate amount of lanthanum oxide powder in a powder mixer for 60 minutes.

[0285] Step 2, powder pressing: Using the isostatic pressing method, powders with different particle size compositions are pressed into a single 3.0 kg billet at a pressure of 200 MPa, and then pre-sintered at low temperature in a hydrogen atmosphere to increase the strength of the billet.

[0286] Step 3: High-temperature sintering: High-temperature sintering is performed, resulting in a density of 18.10 g / cm 3 A sintered billet of

[0287] Step 4, Blooming: Continuously roll the 23.0 mm diameter sintered billet into an 8.0 mm diameter alloy bar using multiple rotary forgings.

[0288] Step 5, pressing: Through multiple rotary forgings and drawing processes using different size wire drawing dies, alloy wire rods with different diameters can be produced through several rounds of drawing.

[0289] In addition, to ensure smooth multiple wire drawing processes, the tungsten wire is annealed to remove residual stress caused by plastic deformation.

[0290] [Comparative Example 2.2] In the following comparative example, a high-strength, high-yield strength tungsten alloy wire was manufactured according to the present invention, and the material composition was 1 wt% La2O3 and 99 wt% W.

[0291] The manufacturing process is as follows.

[0292] Step 1, solid-state doping: Tungsten powder with an average particle size of 2.0 μm was mixed with an appropriate amount of lanthanum oxide powder in a powder mixer for 60 minutes.

[0293] Step 2, powder pressing: Using the isostatic pressing method, powders with different particle size compositions are pressed into a single 3.0 kg billet at a pressure of 200 MPa, and then pre-sintered at low temperature in a hydrogen atmosphere to increase the strength of the billet.

[0294] Step 3: High-temperature sintering: High-temperature sintering is performed, resulting in a density of 18.10 g / cm 3 A sintered billet of

[0295] Step 4, blooming: Using a multi-roller mill, the sintered billet with a diameter of 23.0 mm is continuously rolled into an 8.0 mm alloy bar at a heating temperature of 1650°C.

[0296] Step 5, Pressurization: Rotary forging is repeated multiple times, followed by wire drawing using wire drawing dies of different sizes, which is repeated several times to produce alloy wire rods with different diameters.

[0297] In addition, to ensure smooth multiple wire drawing processes, the tungsten wire is annealed to remove residual stress caused by plastic deformation.

[0298] [Comparative Example 2.3] In the following comparative example, a high-strength, high-yield strength tungsten alloy wire was manufactured according to the present invention, and the material composition was 1 wt% La2O3 and 99 wt% W.

[0299] The manufacturing process is as follows.

[0300] Step 1: Solid-state doping: Add an appropriate amount of lanthanum oxide powder to the aqueous solution and stir for 5 minutes. After the upper layer is poured into the secondary sink and stirred for another 5 minutes, it is allowed to settle for 10 minutes. The upper layer is then poured into the tertiary sink and stirred for another 5 minutes. It is then allowed to settle for 30 minutes. The upper layer is then poured into the quaternary sink and allowed to settle for 24 hours. The solution is then filtered and heated to 100°C for 24 hours to obtain lanthanum oxide powder with a D90 of <2.0 μm. The tungsten powder with an average particle size of 2.0 μm is then mixed with the appropriate amount of aqueously precipitated lanthanum oxide powder with a D90 of <2.0 μm in a powder mixer for 60 minutes to homogenize the mixture.

[0301] Step 2, powder pressing: Using the isostatic pressing method, powders with different particle size compositions are pressed into a single 3.0 kg billet at a pressure of 200 MPa, and then pre-sintered at low temperature in a hydrogen atmosphere to increase the strength of the billet.

[0302] Step 3: High-temperature sintering: High-temperature sintering is performed, resulting in a density of 18.10 g / cm 3 A sintered billet of

[0303] Step 4, Blooming: Continuously roll the 23.0 mm diameter sintered billet into an 8.0 mm diameter alloy bar using multiple rotary forgings.

[0304] Step 5, pressing: Through multiple rotary forgings and drawing processes using different size wire drawing dies, alloy wire rods with different diameters can be produced through several rounds of drawing.

[0305] In addition, to ensure smooth multiple wire drawing processes, the tungsten wire is annealed to remove residual stress caused by plastic deformation.

[0306] [Example 3] In the following examples, a high-strength, high-yield strength tungsten alloy wire is manufactured according to the present invention, and the material composition is CeO2 1 wt% and W 99 wt%.

[0307] The manufacturing process is as follows.

[0308] Step 1, doping: A suitable amount of cerium nitrate solution is uniformly doped into the blue tungsten powder, and after thorough stirring, it is first dried at a low temperature of 80°C for 4 hours, and then dried at 120°C.

[0309] Step 2, reduction: The material obtained in step 1 is transferred to a four-temperature zone reduction furnace to reduce the doped powder into alloy powder with appropriate particle size in one go.

[0310] Step 3, Mixing: The materials obtained in step 2 are put into a mixer according to the composition of different particle sizes, and the powder is mixed at 8 rpm for 80 minutes.

[0311] Step 4, powder pressing: Using the isostatic pressing method, powders with different particle size compositions are pressed into a single 3.0 kg billet at a pressure of 200 MPa, and then pre-sintered at low temperature in a hydrogen atmosphere to increase the strength of the billet.

[0312] Step 5: High-temperature sintering: High-temperature sintering is performed, resulting in a density of 18.10 g / cm 3 A sintered billet of

[0313] Step 6, blooming: The sintered billet with a diameter of 23.0 mm is continuously rolled into an 8.0 mm alloy bar using a multi-roller mill at a heating temperature of 1650°C.

[0314] Step 7, Pressurization: Rotary forging is repeated multiple times, followed by wire drawing using wire drawing dies of different sizes, which is repeated several times to produce alloy wire rods with different diameters.

[0315] In addition, to ensure smooth multiple wire drawing processes, the tungsten wire is annealed to remove residual stress caused by plastic deformation.

[0316] [Example 4] In the following examples, a high-strength and high-yield strength tungsten alloy wire is manufactured according to the present invention, and the material composition is such that the material element composition is 1 wt% Y2O3 and 99 wt% W.

[0317] The manufacturing process is as follows.

[0318] Step 1, doping: A suitable amount of yttrium nitrate solution is uniformly doped into the blue tungsten powder, and after thorough stirring, it is first dried at a low temperature of 80°C for 4 hours, and then dried at 120°C.

[0319] Step 2, reduction: The material obtained in step 1 is transferred to a four-temperature zone reduction furnace to reduce the doped powder into alloy powder with appropriate particle size in one go.

[0320] Step 3, Mixing: The materials obtained in step 2 are put into a mixer according to the composition of different particle sizes, and the powder is mixed at 8 rpm for 80 minutes.

[0321] Step 4, powder pressing: Using the isostatic pressing method, powders with different particle size compositions are pressed into a single 3.0 kg billet at a pressure of 200 MPa, and then pre-sintered at low temperature in a hydrogen atmosphere to increase the strength of the billet.

[0322] Step 5: High-temperature sintering: High-temperature sintering is performed, resulting in a density of 18.10 g / cm 3 A sintered billet of

[0323] Step 6, blooming: The sintered billet with a diameter of 23.0 mm is continuously rolled into an 8.0 mm alloy bar using a multi-roller mill at a heating temperature of 1650°C.

[0324] Step 7, Pressurization: Rotary forging is repeated multiple times, followed by wire drawing using wire drawing dies of different sizes, which is repeated several times to produce alloy wire rods with different diameters.

[0325] In addition, to ensure smooth multiple wire drawing processes, the tungsten wire is annealed to remove residual stress caused by plastic deformation.

[0326] Comparative Example 3 This comparative example is the production of a rhenium-tungsten alloy wire, and the material element composition is Re 1 wt % and W 99 wt %.

[0327] The manufacturing process is as follows.

[0328] Step 1, doping: Weigh out tungsten powder and ammonium rhenate according to the weight ratio, add the appropriate amount of deionized water and the weighed ammonium rhenate to a dopant pot, dissolve thoroughly, then add the weighed tungsten powder, and stir to mix solid and liquid, finally dry at 120°C for 4 hours.

[0329] Step 2, Reduction: The material obtained in Step 1 is fed into a reduction furnace and reduced in one go through four temperature zones to produce tungsten-rhenium alloy powder, the main component of which is 1.000 wt% rhenium.

[0330] Step 3, Mixing: The materials obtained in step 2 are put into a mixer according to the composition of different particle sizes, and the powder is mixed at 8 rpm for 80 minutes.

[0331] Step 4, powder pressing: Using the isostatic pressing method, the powder obtained in step 3 is pressed into a single billet weighing 3.0 kg at a pressure of 200 MPa, and the billet is pre-sintered at a low temperature in a hydrogen atmosphere to increase the strength of the billet.

[0332] Step 5, high-temperature sintering: The pre-sintered billet obtained in step 4 is sintered at high temperature to obtain a density of 18.2 g / cm. 3 A sintered billet of 1000 MPa is obtained.

[0333] Step 6, blooming: The sintered billet with a diameter of 23.0 mm is continuously rolled into an 8.0 mm alloy bar using a multi-roller mill at a heating temperature of 1650°C.

[0334] Step 7, Pressurization: Rotary forging is repeated multiple times, followed by wire drawing using wire drawing dies of different sizes, which is repeated several times to produce alloy wire rods with different diameters.

[0335] In addition, to ensure smooth multiple wire drawing processes, the tungsten wire is annealed to remove residual stress caused by plastic deformation.

[0336] Comparative Example 4 This comparative example is the conventional production of pure tungsten wire.

[0337] The manufacturing process is as follows.

[0338] Step 1, reduction: Ammonium paratungstate is fed into a reduction furnace and reduced to blue tungsten oxide powder in a four-temperature zone reduction furnace, and then reduced to pure tungsten powder through a second reduction.

[0339] Step 2, Mixing: The materials obtained in step 1 are put into a mixer according to the composition of different particle sizes, and the powder is mixed at 8 rpm for 80 minutes.

[0340] Step 3, powder pressing: Using the isostatic pressing method, the powder obtained in step 2 is pressed into a single billet weighing 3.0 kg and measuring 20 mm in diameter at a pressure of 160 MPa. To increase the strength of the billet, the billet is pre-sintered at low temperature in a hydrogen atmosphere.

[0341] Step 4, high-temperature sintering: The pre-sintered billet obtained in step 3 is sintered at high temperature to obtain a density of 17.6 g / cm 3 A sintered billet with a diameter of 17.5 mm is obtained.

[0342] Step 5, blooming: The sintered billet with a diameter of 17.5 mm is continuously rolled into an 8.0 mm alloy bar using a three-roller mill at a heating temperature of 1600°C.

[0343] Step 6, Pressurization: Rotary forging is repeated multiple times, followed by wire drawing using wire drawing dies of different sizes, which is repeated several times to produce alloy wire rods with different diameters.

[0344] In addition, to ensure smooth multiple wire drawing processes, the tungsten wire is annealed to remove residual stress caused by plastic deformation.

[0345] The specific parameters and commonly used reagents in the above examples are specific or preferred examples of the present invention, and the present invention is not limited to these examples. Those skilled in the art may make appropriate changes or modifications within the scope of the technical concept of the present invention.

[0346] The particle size of La2O3 particles on the surface of the tungsten powders and sintered billets obtained in Examples 1.1, 2.1, and Comparative Examples 1.1 and 2.1 was measured and analyzed using an electron microscope, and the results are shown in Table 1. Table 1 shows the particle size of La2O3 particles in the tungsten powders and sintered billets of the Examples and Comparative Examples.

[0347] [Table 1]

[0348] According to the test results in Table 1, the processing method of the present invention can effectively refine the grain size of La2O3 in the alloy tungsten material.

[0349] The particle size of La2O3 in the resulting products of different specifications obtained in Example 1.1, Comparative Examples 1.1 to 1.3, and Comparative Examples 2.1 to 2.3, i.e., billets, 8.0 mm, 5.0 mm, 1.0 mm, and 0.4 mm rods and wires, was measured and analyzed using an electron microscope, and the results are shown in Table 2. Table 2 shows the particle size of La2O3 particles in the resulting products of different sizes in the Examples and Comparative Examples.

[0350] [Table 2]

[0351] The test results in Table 1 show that the particle size of the oxide particles on the surface of the alloy billets and wire rods produced by the processing method of the present invention is much smaller than the particle size of the oxide particles on the alloy billets and wire rods produced by the processing methods of Comparative Examples 1.1 to 1.3 and Comparative Examples 2.1 to 2.3.

[0352] The wire rods of different specifications obtained in the examples and comparative examples, namely, wire rods of 0.1 mm, 0.06 mm, 0.04 mm, and 0.025 mm, were measured for tensile strength, ultimate elastic strength, and push-pull toughness by the following methods.

[0353] The tensile strength test method is as follows: A standard tensile tester is used to clamp a 200 mm tungsten wire and apply a load at one end at a constant rate to obtain tensile strength data and elastic limit strength.

[0354] The tensile strength is calculated from the following formula (1).

[0355] σ=F / S ……(1)

[0356] F is the peel force in N, and S is the original cross-sectional area in mm.

[0357] The push-pull toughness was measured by wrapping a tungsten wire around a straightened core wire once. A reverse force (8 g or more) was applied to the sample tray, and a motor controlled the winding disk to perform high-speed winding. The tungsten wire was wound around the core wire while moving. The smaller the core wire diameter, the greater the toughness if the tungsten wire did not break when passing through at high speed. Preferably, the reverse force was 50 g for a 100 μm tungsten wire, 12 g for a 40 μm tungsten wire, and 8 g for a 25 μm tungsten wire. The push-pull measurement apparatus is shown in Figure 1, and the test and analysis results are shown in Table 3. Table 3 shows the performance measurements for the solid-liquid doping example and the comparative example of the prior art.

[0358] [Table 3] JPEG0007772792000004.jpg164164

[0359] In Table 3, " / " means that the relevant test was not conducted.

[0360] The test results in Table 3 reveal the following:

[0361] The tensile strength and elastic limit strength of the wires of various specifications manufactured by the present invention are much higher than those of conventional tungsten wires and even higher than those of rhenium-tungsten alloy wires. For the same push-pull toughness, the tungsten wires manufactured by the processing method of the present invention have a much better overall performance in terms of tensile strength and push-pull toughness than rhenium-tungsten wires and tungsten wires manufactured by conventional methods.

[0362] The tungsten alloy wire rod produced in Comparative Example 3 has a tensile strength of more than 4500 MPa, but its push-pull property is poor, and its toughness is much lower than that of the wire rod of the present invention.Therefore, the processing method of the present invention adds a substance such as lanthanum oxide and carries out a treatment process, so that the alloy wire rod with a finer diameter, higher strength and better toughness can be mass-produced.

[0363] Table 4 is a performance measurement table for solid-liquid doping Example 1.1 and Comparative Examples 1.1 to 1.5.

[0364] [Table 4]

[0365] In Table 4, "\" means that the wire cannot be processed any thinner.

[0366] The test results in Table 4 reveal the following:

[0367] The blooming method using solid-liquid doping and multi-roll rolling of the present invention can effectively improve the tensile strength, ultimate elastic strength, and push-pull toughness of alloy wire rods of all specifications, and is also suitable for producing thinner, stronger, and tougher alloy wire rods.

[0368] Table 5 is a performance measurement table for solid-liquid doping Example 2.1 and Comparative Examples 2.1 to 2.3.

[0369] [Table 5]

[0370] In Table 5, "\" means that the wire cannot be processed any thinner.

[0371] The test results in Table 5 reveal the following:

[0372] The blooming method using solid-state doping and multi-roll rolling of the present invention can effectively improve the tensile strength, ultimate elastic strength, and push-pull toughness of alloy wire rods of all specifications, and is also suitable for producing thinner, stronger, and tougher alloy wire rods.

[0373] Therefore, the alloy wire of the present invention can have better performance by adding lanthanum oxide, other rare earth elements, rare earth oxides, etc. Furthermore, by further optimizing the processing method, it is possible to mass-produce alloy wires that are thinner, have higher strength, and have better toughness.

[0374] The alloy wire of the present invention or the alloy wire produced by the production method of the present invention can be used in cutting processes in which tungsten wire is used, such as wire sawing and weaving wire into warp and weft to produce wire mesh.

[0375] The wire sawing can be used to cut various materials, such as silicon wafers, magnetic materials, and hard-surface materials such as semiconductor materials, including sapphire and silicon carbide, or in combination with related cutting equipment. By applying its excellent performance to cutting, it can effectively improve cutting quality and cutting efficiency. The metal mesh can be used in screen printing, inspection probes, catheter wires, etc.

[0376] In addition, when the alloy wire of the present invention is actually applied in the cutting field, the alloy wire is used as a bus bar, and particles such as diamond are electroplated or brazed to it, and used to cut hard-surface materials such as silicon wafers, sapphire, third-generation semiconductor materials such as silicon carbide, and magnetic materials.

[0377] Screen printing is widely used in the manufacture of printed circuit boards, thick-film integrated circuits, solar cells, resistors, capacitors, piezoelectric components, photosensitive components, thermal components, liquid crystal display components, etc. The metal mesh formed from the alloy wire of the present invention can also be used in screen printing, replacing stainless steel wire, for example, replacing small screens of 18 μm or less.

[0378] Furthermore, the alloy wire of the present invention has high tensile strength, ultimate elastic strength, push-pull toughness, and good electrical conductivity and mechanical properties, making it suitable for use in cables and cords for medical and industrial precision instruments, for example, cables and cords for various mechanical devices. These cables have the highest strength and longest lifespan and can withstand high loads and bending stresses, for example, in minimally invasive surgical instruments and multi-joint systems.

[0379] Steel wire ropes are used for the lifting devices in monocrystalline and polycrystalline silicon furnaces. As the lifting weight of monocrystalline and polycrystalline silicon furnaces increases, the outer diameter of the steel wire ropes used in monocrystalline furnaces has increased from 1.8mm to 4.5mm. However, while aiming to reduce the cutting load of steel wire to 30% or less, steel wire ropes have traditionally been used to embed a magnetic field in monocrystalline and polycrystalline silicon furnaces to improve the purity and lifespan of monocrystalline silicon. However, steel wire ropes cannot be used in magnetic fields, which can lead to the crystal orientation of the resulting monocrystalline rod becoming asymmetrical. Furthermore, steel wire ropes contain high iron and carbon content, which can cause major impurities in the monocrystalline silicon to exceed the standard limits, significantly affecting its purity. Furthermore, as the quality of monocrystalline rods improves, the tensile strength and lifespan of ropes are increasingly required at 1500°C in monocrystalline and polycrystalline silicon furnaces.

[0380] As described above, the alloy wire of the present invention satisfies the technical requirements for ropes in "lifting systems", such as high strength, high tensile strength, non-magnetic properties, high temperature resistance, and excellent verticality, and can be used in the smelting industry, such as smelting, casting, and single crystal furnaces, for example, as traction ropes for high-temperature furnaces.

[0381] Furthermore, due to its excellent flexibility and wear resistance, as well as its excellent tensile strength and fatigue resistance, the alloy wire can be used as a material to manufacture micromechanical filaments used in modern surgical robots.

[0382] In addition, the above alloy wire can be used to drive the movement of a human arm, elbow, or wrist, for example, by using tungsten alloy wire to move the surgeon's skeletal muscles, rather than the traditional method of moving them with the surgeon's own body, thereby reducing the burden on the surgeon with the robot and preventing fatigue and tiredness even after multiple surgeries.

[0383] Furthermore, as the loads placed on wire ropes in medical robots and medical equipment continue to increase, their structures are being optimized and improved. The commonly used 1x7, 7x7, and 7x19 structures have already been replaced with more precise and complex stranded ropes (e.g., 7x37, 19x19, and 19x37). These structures offer improved tensile strength, a high modulus of elasticity, and excellent flexibility, meeting the more demanding application requirements of today's surgical instruments. Furthermore, to manufacture a 19x37 structured wire rope with a diameter of 0.5 mm, a filament with a diameter of 0.0005 inches (12.7 μm) is required, making it nearly invisible to the naked eye.

[0384] Furthermore, the alloy wire of the present invention, being thin and light, with high strength and toughness, can be applied in technical fields such as textiles, for example, cut-resistant protective gloves and protective clothing. This alloy wire offers significant advantages when applied to cut-resistant safety equipment. While the commonly used sizes for directly weaving tungsten wire or thread into gloves in conventional technologies are 18.5 μm, 30 μm, and 40 μm, the alloy wire of the present invention can be processed to finer specifications, with the thinnest reaching 3 μm. This allows the product to be softer, lighter, and thinner, while providing a more flexible and comfortable fit with enhanced protection, making it suitable for safety protection in a variety of occupations. Furthermore, high-strength thin tungsten wire is more than twice as strong as stainless steel wire, and with proper design, cut resistance can be improved by more than two levels, achieving high protection performance equivalent to US standard A6 to A9 and European standard F.

[0385] The alloy wire provided by the present invention satisfies the above requirements in terms of diameter, tensile strength, and toughness.

[0386] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments. Various embodiments that fall within the technical concept of the present invention fall within the scope of protection of the present invention. Those skilled in the art will recognize that any changes or modifications made to the above embodiments without departing from the technical concept of the present invention will fall within the scope of protection of the present invention.

Claims

1. An alloy wire made of a tungsten alloy, The tungsten alloy is composed of tungsten and lanthanum oxide, The wire diameter of the alloy wire is 60 μm or less, The tensile strength of the alloy wire is 4200 MPa or more, The alloy wire has an elastic ultimate strength of 2500 MPa or more, The content of lanthanum oxide in the alloy wire is 0.15 mass% to 1.8 mass%; The push-pull core wire diameter of the alloy wire is 350 μm or less. An alloy wire characterized by:

2. The tungsten alloy further contains a metal element M, and the metal element M is at least one selected from potassium, rhenium, molybdenum, iron, cobalt, and rare earth metals.

2. The alloy wire according to claim 1 .

3. The metal element M is potassium, and the content of potassium is less than 80 ppm.

3. The alloy wire according to claim 2.

4. The tungsten alloy further contains one or more rare earth oxides in addition to lanthanum oxide.

2. The alloy wire according to claim 1 .

5. A method for manufacturing an alloy wire according to claim 1, The process includes powder doping, pressing, sintering, and blooming. In the blooming process, the sintered billet is bloomed by multi-roll rolling, and in the tungsten rod after the blooming, the ratio of the length of the wire material of the lanthanum oxide granules in the longitudinal direction to the particle size of the granule cross section is greater than 5. A method for manufacturing an alloy wire, comprising:

6. The powder doping step includes a solid-liquid doping step, a reduction step, and a powder production step, The solid-liquid doping step includes a step of gradually drying the mixed tungsten doping solution, the step-wise drying process comprises at least two temperature stages; The two temperature stages are separated by 100°C, with the first stage being heated and dried at a temperature below 100°C, and the second stage being heated and dried at a temperature above 100°C. The method for manufacturing an alloy wire according to claim 5 .

7. The stepwise drying process in the solid-liquid doping process includes a first drying stage and a second drying stage, the temperature of the first drying stage is 60 to 80°C, and the temperature of the second drying stage is 110 to 150°C. The method for manufacturing an alloy wire according to claim 6 .

8. The reduction step is a step of reducing the material produced in the solid-liquid doping step to an average Fisher particle size. This includes a process of reducing the alloy to powder with a size of 1.0 to 4.0 μm. The method for manufacturing an alloy wire according to claim 6 .

9. The powder doping process includes a solid-solid doping process; The solid-solid doping process includes mixing tungsten powder having a Fischer particle size of 1.0 μm to 4.0 μm and lanthanum oxide having a particle size distribution D90<2.0 μm as raw materials to obtain tungsten powder doped with lanthanum oxide. The method for manufacturing an alloy wire according to claim 5 .

10. The particle size of the lanthanum oxide in the sintered billet is 2.5 μm or less. The method for manufacturing an alloy wire according to claim 5 .

11. Use of the alloy wire according to any one of claims 1 to 4 or the alloy wire manufactured by the method for manufacturing an alloy wire according to any one of claims 5 to 10 in the field of material cutting.

12. The material includes at least a hard surface material, the hard surface material includes at least one of a silicon wafer, a magnetic material, and a semiconductor material, and the semiconductor material includes at least one of sapphire and silicon carbide.

12. Use according to claim 11.

13. Use of the alloy wire according to any one of claims 1 to 4 or the alloy wire produced by the method for producing an alloy wire according to any one of claims 5 to 10 in the field of cables or ropes.

14. The cable or rope is used to pull medical or industrial precision equipment and high-temperature furnaces.

14. The use according to claim 13.

15. Use of the alloy wire according to any one of claims 1 to 4 or the alloy wire produced by the method for producing an alloy wire according to any one of claims 5 to 10 in the field of textiles.

16. Gloves and protective clothing made from the alloy wire by spinning or weaving are also included.

16. Use according to claim 15.

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