High-temperature corrosion-resistant stranded conductor and manufacturing method thereof

Abstract

The invention relates to the technical field of high-temperature conductors, in particular to a high-temperature corrosion-resistant stranded wire conductor and a manufacturing method thereof.The high-temperature corrosion-resistant stranded wire conductor is formed by stranding a plurality of composite wire monofilaments, and each composite wire monofilament is formed by compounding a high-conductivity core wire and a high-temperature corrosion-resistant alloy wrapping the core wire; the stranded conductor can maintain the strength and transmit signals for a long time in a 1000 DEG C high-temperature atmospheric environment; the high-conductivity core wire is made of copper or copper alloy; a plurality of composite wires are stranded to form a stranded wire conductor, and each composite wire is formed by compounding a high-conductivity core wire and a high-temperature corrosion-resistant alloy wrapping the outer side of the core wire, so that the wire still keeps high strength, conductivity and excellent oxidation corrosion resistance when working at the temperature of 600-1000 DEG C for a long time, and the problem that in the prior art, the wire is not high in strength, high in conductivity and high in oxidation corrosion resistance is solved. And the conventional conductor cannot work normally in a high-temperature environment.

Description

Technical Field

[0001] The invention relates to the technical field of high-temperature conductors, and in particular to a high-temperature corrosion-resistant stranded wire conductor and a manufacturing method thereof. Background Art

[0002] Conductors will be oxidized under high temperature conditions, and as the temperature rises to a certain range, the conductor strength decreases sharply and the resistance increases. In high temperature environments, conductors are often required to oxidize slowly, otherwise the conductors will be corroded and broken. In some high temperature atmospheric environments, the temperature even exceeds 1000°C, and the conductors also need to perform the function of conducting electricity, so the problems of high temperature corrosion resistance, conductivity and strength of the conductors must be solved at the same time.

[0003] Chinese patent CN118155913B discloses a stranded conductor and a stranded wire manufacturing method that maintain high strength and high conductivity in a high temperature environment, and relates to the technical field of high temperature conductors. The stranded conductor is composed of a plurality of composite wire single filaments twisted together, and the composite wire includes a nickel-tantalum-tungsten core wire, a high-conductivity alloy tube wrapped around the outside of the nickel-tantalum-tungsten core wire, and a coating provided on the outside of the conductive alloy tube; the stranded conductor is formed by twisting a plurality of composite wires together, and the composite wire is composed of a nickel-tantalum-tungsten core wire, a high-conductivity alloy tube wrapped around the outside of the nickel-tantalum-tungsten core wire, and a coating provided on the outside of the conductive alloy tube, so that the wire can maintain high strength, conductivity and fatigue resistance when working for a long time at a temperature of 600°C to 700°C, thereby solving the problem of low conductivity or low strength of current heat-resistant conductors in a high temperature environment.

[0004] However, this technical solution is mainly applicable to working conditions where high conductivity and strength of conductors are required in high-temperature environments below 600℃~700℃. However, the conductor cannot work normally under high-temperature conditions above 700℃, especially for working for a long time under high-temperature conditions of 800℃~1000℃ while still maintaining good strength, signal transmission performance and anti-oxidation and corrosion properties. Currently, there is no suitable conductor material on the market. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies in the prior art and provide a high-temperature corrosion-resistant stranded conductor. The stranded conductor is formed by twisting a number of composite wire monofilaments. The composite wire monofilaments are composed of a highly conductive core wire and a high-temperature corrosion-resistant alloy wrapped around the outside of the core wire. The wire can maintain high strength, conductivity, signal transmission performance and excellent anti-oxidation and corrosion properties when working for a long time at a high temperature of 600°C to 1000°C, thereby solving the technical problem in the prior art that conventional conductors cannot work normally in a high-temperature environment.

[0006] To achieve the above object, the present invention provides the following technical solutions: A high-temperature corrosion-resistant stranded conductor, the stranded conductor is composed of a plurality of composite wire monofilaments twisted together, the composite wire monofilaments are composed of a high-conductivity core wire and a high-temperature corrosion-resistant alloy wrapped around the core wire, so that the stranded conductor can maintain strength and transmit signals for a long time in a high-temperature atmospheric environment below 1000°C; The highly conductive core wire is copper or copper alloy; The composition of the high temperature corrosion-resistant alloy is 60% to 75% nickel, 10.0% to 20.0% chromium, 5% to 15% molybdenum, 0.5% to 10% of the total amount of tantalum and niobium, 0.5% to 10% of tungsten, 2.0% to 7.0% aluminum, 0.1% to 1.0% titanium, 0.1% to 2.0% iron, and the remainder is inevitable trace impurities, the total weight of which is not more than 0.5%, and the oxygen content is less than 9ppm.

[0007] As an improvement, the composition of the high temperature corrosion-resistant alloy is nickel 60%~75%, chromium 10.0%~20.0%, molybdenum 6%-10%, tantalum 2%-3%, niobium 1.5%, tungsten 4%~5%, aluminum 2.0%~7.0%, titanium 0.1%~1.0%, iron 0.1%~2.0%, and the remainder is inevitable trace impurities, the total weight of impurities is not more than 0.5%, and the oxygen content is less than 9ppm.

[0008] As an improvement, the cross-sectional area of ​​the core wire in the composite wire monofilament accounts for 20% to 50% of the total area.

[0009] As an improvement, the diameter of the composite wire monofilament is 0.08-0.5 mm.

[0010] As an improvement, the tensile strength of the single filament of the composite wire at 20° C. is greater than 400 MPa, the conductivity is greater than 20%, and the elongation is greater than 2%.

[0011] As an improvement, the comprehensive tensile strength of the monofilament of the composite wire under high temperature conditions is: the tensile strength at 1000°C is not less than 50Mpa, the tensile strength at 900°C is not less than 80Mpa, the tensile strength at 800°C is not less than 150Mpa, and the tensile strength at 600-750°C is not less than 300Mpa.

[0012] As an improvement, the copper alloy is a copper-silver alloy, and the composition of the copper-silver alloy is as follows by weight: 1% to 6% silver, the remainder is copper and unavoidable impurities, the total weight of impurities is not more than 0.05%, and the oxygen content is less than 9 ppm; the highly conductive core wire has a tensile strength of not less than 300 MPa after annealing, and a conductivity greater than 80%; the conductivity of the composite wire monofilament under high temperature conditions is not less than 10%.

[0013] As an improvement, the core wire is copper; the electrical conductivity of the composite wire monofilament is not less than 15% under the working condition of 600-1000°C.

[0014] Another object of the present invention is to provide a method for manufacturing a high-temperature corrosion-resistant stranded wire conductor in response to the shortcomings of the prior art. The method achieves the production of ultra-fine high-temperature resistant stranded wire conductors by manufacturing core wires, high-temperature corrosion-resistant alloy tubes, composite wires, and high-temperature corrosion-resistant stranded wires by twisting. The method satisfies the requirements of maintaining high strength, conductivity, and excellent anti-oxidation and corrosion properties of the conductors under high-temperature conditions of 600-1000°C, thereby achieving the normal use of the stranded wire conductors under high-temperature and corrosive conditions, and solving the technical problem in the prior art that the conductors cannot work normally under high-temperature and corrosive conditions.

[0015] To achieve the above object, the present invention provides the following technical solutions: A method for manufacturing a high-temperature corrosion-resistant stranded wire conductor comprises the following steps: S1, manufacturing core wire; S2. Manufacturing of high temperature corrosion resistant alloy pipes: 2.1. Tube making: high temperature corrosion resistant alloy tube blanks are made by vacuum casting and perforation, and necessary heat treatment is performed; 2.2 Ring rolling: Ring rolling the tube billet to reduce its diameter and wall thickness, and refine the grains to obtain a rolled tube; 2.3. Drawing: Drawing the corrosion-resistant alloy tube billet after ring rolling to further reduce its diameter to obtain a drawn tube; 2.4. Polishing and cleaning: polish and clean the inner wall of the drawn tube blank; S3, manufacturing composite line: 3.1. Pipe threading: inserting the copper-silver alloy core wire obtained in step 1.4 into the high-temperature corrosion-resistant alloy tube obtained in step 2.4 to obtain an initial composite wire; 3.2. Drawing: The initial composite wire obtained in step 3.1 is drawn to make the core wire and the high temperature corrosion resistant alloy tube fit tightly; 3.3, bright annealing: bright annealing the product obtained in step 3.2; 3.4, repeating steps 3.2 and 3.3 in sequence until a composite wire monofilament with a desired outer diameter is obtained; 3.5. Heat treatment: heat treatment of the composite wire monofilament under inert gas protection; S4. Manufacturing high temperature corrosion resistant stranded wire: 4.1. Twisting: Twisting a plurality of composite wire monofilaments obtained in step 3.5 to obtain a high temperature corrosion resistant twisted wire conductor; 4.2. Heat treatment: The high temperature corrosion resistant stranded wire conductor is subjected to inert gas protection heat treatment.

[0016] As an improvement, in step S1, the steps of using the copper-silver alloy to manufacture the core wire are as follows: 1.1. Continuous casting: Smelting copper-silver alloy in the absence of oxygen and continuously casting to obtain copper-silver alloy rods; 1.2. Hot rolling: hot rolling the copper-silver alloy rod to reduce its diameter and then rapidly cool it to obtain a silver-copper rod blank with refined grains; 1.3. Wire drawing: The hot-rolled copper-silver alloy fine-grained rod blank is wire drawn to obtain an alloy rod of a certain diameter; 1.4. Polishing and cleaning: Polish and clean the surface of the copper-silver alloy rod.

[0017] As an improvement, in step S1, the steps of using copper to make the core wire are as follows: 1.1. Continuous casting: Smelting copper without oxygen and continuously casting to obtain copper rods; 1.2. Hot rolling: Hot rolling the copper rod to reduce its diameter and then rapidly cool it to obtain a silver-copper rod blank with refined grains; 1.3. Wire drawing: The hot-rolled copper fine-grained rod blank is drawn to obtain a copper rod of a certain diameter; 1.4. Polishing and cleaning: Polish and clean the surface of the copper rod.

[0018] As an improvement, the total deformation rate of each drawing in step 3.2 does not exceed 40%.

[0019] As an improvement, the diameter of the monofilament obtained in step 3.4 is 0.08-0.5 mm, and more preferably 0.08-0.25 mm.

[0020] The beneficial effects of the present invention are: (1) The present invention composites a high-temperature corrosion-resistant alloy on the outside of a highly conductive core material, thereby achieving a conductor that can not only meet normal signal transmission requirements under high temperature conditions, but can also work normally for a long time under high temperature conditions, thereby solving the technical problem in the prior art that conductor materials cannot work for a long time under high temperature conditions; (2) The present invention uses a composite structure conductor to achieve ultra-fine size conductors while maintaining high conductivity, and also maintaining high strength and corrosion resistance to meet normal signal transmission under high temperature conditions; (3) The present invention uses ultra-fine structured conductor materials to save space and weight during use, and is particularly suitable for long-term high-temperature working conditions with limited space and weight requirements; In summary, the present invention has the advantages of being able to work normally under 600-1000°C conditions, being particularly suitable for conditions where there are restrictions on conductor wire diameter, installation space, conductor weight and the conductor is required to still have stable medium and low frequency signal transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the cross-sectional structure of the composite wire monofilament of the present invention; Figure 2This is a schematic diagram of a cross-section of a single-filament composite wire of the present invention from a microscope perspective; Figure 3 This is a schematic diagram of the surface microscope view of the composite wire monofilament in Example 1 of the present invention after working for a long time at 1000° C.; Figure 4 This is a schematic diagram of the surface microscope view of the composite wire monofilament in Example 2 of the present invention after working for a long time at 1000° C.; Figure 5 It is a schematic diagram of the surface microscope view of the composite wire monofilament in Comparative Example 1 of the present invention after working for a long time at 1000°C; Figure 6 It is a schematic diagram of the surface microscope view of the composite wire monofilament in Comparative Example 3 of the present invention after working at 1000° C. for a short time; Figure 7 It is a schematic diagram of the process flow of the present invention. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0024] Embodiment 1 like Figure 1-Figure 3As shown, this embodiment provides a high-temperature corrosion-resistant stranded conductor, which is composed of a plurality of composite wire monofilaments twisted together, wherein the composite wire monofilament is composed of a highly conductive core wire 1 and a high-temperature corrosion-resistant alloy 2 wrapped outside the core wire 1, so that the stranded conductor can maintain strength for a long time and transmit signals in a high-temperature atmospheric environment below 1000°C; The highly conductive core wire 1 is made of copper or copper alloy, and in this embodiment, copper-silver alloy is preferred. The composition of the copper-silver alloy is as follows by weight: 1% to 6% silver, the remainder is copper and unavoidable impurities, the total weight of impurities is not more than 0.05%, and the oxygen content is less than 9ppm; the highly conductive core wire 1 has a tensile strength of not less than 300MPa after annealing, and a conductivity greater than 80%; The composition of the high temperature corrosion-resistant alloy 2 is 60% to 75% nickel, 10.0% to 20.0% chromium, 5% to 15% molybdenum, 0.5% to 10% total amount of tantalum and niobium, 0.5% to 10% tungsten, 2.0% to 7.0% aluminum, 0.1% to 1.0% titanium, 0.1% to 2.0% iron, and the remainder is inevitable trace impurities, the total weight of which is not more than 0.5%, and the oxygen content is less than 9 ppm.

[0025] Furthermore, the cross-sectional area of ​​the core wire 1 in the composite wire monofilament accounts for 20% to 50% of the total area.

[0026] It should be noted that if the cross-sectional area of ​​the core wire 1 accounts for too large a proportion, high conductivity can be achieved in the process of signal transmission by a thinner conductor, but long-term working conditions of high temperature corrosion resistance cannot be achieved; if the cross-sectional area of ​​the core wire 1 accounts for too small a proportion, the conductivity requirement of the transmission signal cannot be achieved, but the high temperature corrosion resistance is excellent. Therefore, it is necessary to make a suitable proportion selection according to the actual working conditions. In some embodiments, the cross-sectional area of ​​the core wire 1 in the composite wire monofilament accounts for 30% to 50% of the total area.

[0027] In this embodiment, the tensile strength of the single filament of the composite wire at 20° C. is greater than 400 MPa, the conductivity is greater than 20%, and the elongation is greater than 2%.

[0028] The electrical conductivity of the composite wire monofilament under high temperature conditions is not less than 10%.

[0029] The diameter of the composite wire monofilament is 0.08-0.5 mm, preferably 0.08-0.25 mm, so as to realize the production of ultra-fine high-temperature resistant wires, which are particularly suitable for wire conductors used for signal transmission under ultra-high temperatures.

[0030] Among them, Figure 7 As shown, this embodiment also provides a method for manufacturing a high temperature corrosion resistant stranded wire conductor, comprising the following steps: S1, manufacturing core wire 1; S2. Manufacturing of high temperature corrosion resistant alloy pipe 2: 2.1. Tube making: high temperature corrosion resistant alloy 2 tube blank is made by vacuum casting and perforation, with the outer diameter of the tube being 40-80 mm and the wall thickness being 5-8 mm, and necessary heat treatment is performed at a heat treatment temperature of 1100°C; 2.2. Ring rolling: Ring rolling the tube billet to reduce its diameter and wall thickness, and refine the grains to obtain a rolled tube; by ring tying, the grains of the alloy tube are refined, the strength and hardness of the alloy tube billet are improved, and the fatigue resistance and corrosion resistance as well as the processing performance are improved; preferably, the outer diameter of the tube after ring tying is 20 mm and the wall thickness is 2-3 mm; 2.3. Drawing: Drawing the corrosion-resistant alloy tube blank after ring rolling to further reduce its diameter to obtain a drawn tube; preferably, the outer diameter of the tube after drawing is 8 mm and the wall thickness is 1.5-2 mm; 2.4. Polishing and cleaning: polish and clean the inner wall of the drawn tube blank; S3, manufacturing composite line: 3.1. Pipe threading: insert the copper-silver alloy core wire 1 obtained in step 1.4 into the high-temperature corrosion-resistant alloy 2 tube obtained in step 2.4 to obtain an initial composite wire; 3.2. Drawing: The initial composite wire obtained in step 3.1 is drawn to make the core wire 1 and the high temperature corrosion resistant alloy tube 2 fit tightly; 3.3, bright annealing: bright annealing the product obtained in step 3.2, the annealing temperature is 800~900℃; 3.4, repeating steps 3.2 and 3.3 in sequence until a composite wire monofilament with a desired outer diameter is obtained; 3.5. Heat treatment: The composite wire monofilament is subjected to inert gas protection heat treatment. The heat treatment method is annealing treatment at a temperature of 900°C for 2 hours; S4. Manufacturing high temperature corrosion resistant stranded wire: 4.1. Twisting: Twisting a plurality of composite wire monofilaments obtained in step 3.5 to obtain a high temperature corrosion resistant twisted wire conductor; 4.2. Heat treatment: The high temperature corrosion resistant stranded conductor is subjected to inert gas protection heat treatment at a temperature of 400~500℃.

[0031] Preferably, the total deformation rate of each drawing in step 3.2 does not exceed 40%.

[0032] Preferably, in step S1, the steps of using the copper-silver alloy to manufacture the core wire 1 are as follows: 1.1. Continuous casting: Smelting copper-silver alloy in an oxygen-free state and continuously casting to obtain copper-silver alloy rods. The preferred size of the copper-silver alloy rods is 20 mm. 1.2. Hot rolling: hot rolling the copper-silver alloy rod at a temperature of 550-650°C, reducing its diameter to 8 mm and rapidly cooling it to room temperature to obtain a silver-copper rod blank with refined grains; 1.3. Wire drawing: The hot-rolled copper-silver alloy fine-grained rod blank is wire drawn to obtain an alloy rod of a certain diameter, wherein the diameter is drawn from 8mm to 4mm; 1.4. Polishing and cleaning: Polish and clean the surface of the copper-silver alloy rod.

[0033] Embodiment 2 In this embodiment, the highly conductive core wire 1 is made of pure copper.

[0034] The electrical conductivity of the composite wire monofilament under high temperature conditions is not less than 15%.

[0035] Among them, in the manufacturing method steps, in step S1, the steps of using copper to manufacture the core wire 1 are as follows: 1.1. Continuous casting: Smelt copper without oxygen and continuously cast it to obtain a copper rod with a diameter of 20 mm; 1.2. Hot rolling: hot rolling the copper rod to reduce its diameter and then rapidly cool it to obtain a silver-copper rod blank with refined grains; preferably, the hot rolling temperature is 550-650°C, the diameter is reduced to 8 mm and then rapidly cooled to room temperature; 1.3. Wire drawing: The hot-rolled copper fine-grained rod blank is subjected to wire drawing to obtain a copper rod of a certain diameter. Preferably, the diameter after wire drawing is 4 mm; 1.4. Polishing and cleaning: Polish and clean the surface of the copper rod.

[0036] The rest is the same as in the first embodiment.

[0037] Embodiment 3 In this embodiment, the composition of the high temperature corrosion-resistant alloy 2 is 60% to 75% nickel, 10.0% to 20.0% chromium, 6% to 10% molybdenum, 0.5% to 10% of the total amount of tantalum and niobium, 0.5% to 10% tungsten, 2.0% to 7.0% aluminum, 0.1% to 1.0% titanium, 0.1% to 2.0% iron, and the remainder is inevitable trace impurities, the total weight of which is not more than 0.5%, and the oxygen content is less than 9 ppm.

[0038] The highly conductive core wire 1 is a copper-silver alloy, wherein the weight ratio of silver in the copper-silver alloy is 6%; the cross-sectional area of ​​the core wire 1 accounts for 50% of the total area.

[0039] In this embodiment, the diameter of the composite wire monofilament is 0.16 mm. The rest is the same as in the first embodiment.

[0040] Embodiment 4 In this embodiment, the composition of the high temperature corrosion-resistant alloy 2 is nickel 60%~75%, chromium 10.0%~20.0%, molybdenum 6%-10%, tantalum 2%-3%, niobium 1.5%, tungsten 4%~5%, aluminum 2.0%~7.0%, titanium 0.1%~1.0%, iron 0.1%~2.0%, and the remainder is inevitable trace impurities, the total weight of impurities is not more than 0.5%, and the oxygen content is less than 9ppm.

[0041] The highly conductive core wire 1 is a copper-silver alloy, wherein the weight ratio of silver in the copper-silver alloy is 6%; the cross-sectional area of ​​the core wire 1 accounts for 40%-50% of the total area.

[0042] In this embodiment, the diameter of the composite wire monofilament is 0.1 mm. The rest is the same as in the first embodiment.

[0043] Comparative Example 1 In this embodiment, the composition of the high temperature corrosion-resistant alloy 2 is 60% to 75% nickel, 10.0% to 20.0% chromium, 0.5% to 10% of the total amount of tantalum and niobium, 0.5% to 10% of tungsten, 2.0% to 7.0% aluminum, 0.1% to 1.0% titanium, 0.1% to 2.0% iron, and the remainder is inevitable trace impurities, the total weight of which is not more than 0.5%, and the oxygen content is less than 9 ppm.

[0044] The highly conductive core wire 1 is a copper-silver alloy, wherein the weight ratio of silver in the copper-silver alloy is 6%; the cross-sectional area of ​​the core wire 1 accounts for 50% of the total area.

[0045] In this embodiment, the diameter of the composite wire monofilament is 0.16 mm. The rest is the same as in the first embodiment.

[0046] Comparative Example 2 In this embodiment, the composition of the high temperature corrosion-resistant alloy 2 is 60% to 75% nickel, 10.0% to 20.0% chromium, 5% to 15% molybdenum, 0.5% to 10% of the total amount of tantalum and niobium, 2.0% to 7.0% aluminum, 0.1% to 1.0% titanium, 0.1% to 2.0% iron, and the remainder is inevitable trace impurities, the total weight of which is not more than 0.5%, and the oxygen content is less than 9 ppm.

[0047] The highly conductive core wire 1 is a copper-silver alloy, wherein the weight ratio of silver in the copper-silver alloy is 6%; the cross-sectional area of ​​the core wire 1 accounts for 50% of the total area.

[0048] In this embodiment, the diameter of the composite wire monofilament is 0.16 mm. The rest is the same as in the first embodiment.

[0049] Comparative Example 3 A stranded conductor with high strength and high conductivity in a high temperature environment is manufactured by using the technical solution of Example 3 in Patent Publication No. CN118155913A. The stranded conductor in this comparative example fails in signal transmission performance after working at above 800°C for a short time. Figure 6 As shown in the figure, under the working condition of 1000℃, the surface state after working for a short time, it can be seen from the figure that the surface of the conductor has been completely charred, the conductor is seriously damaged and cannot be used normally.

[0050] The tensile properties and endurance properties of the stranded wire conductors of Examples 1 to 4 and Comparative Examples 1 to 3 were tested using conventional testing methods in the art, as shown in Tables 1 and 2 below.

[0051] Table 1 Tensile properties tested.

[0052]

[0053] Table 2. Durability test.

[0054]

[0055] Since molybdenum can improve the high-temperature oxidation resistance of the alloy, and tungsten can effectively inhibit the formation of voids during the creep process of the alloy under high-temperature conditions, Figure 3 to Figure 4 As shown, in combination with Tables 1 and 2 above, it can be seen that the surface quality of the composite wire monofilament in Examples 1 to 4 of the present invention after working for a long time at 1000°C. It can also be seen from the figure that the surface morphology of the conductor remains intact, has excellent high-temperature corrosion resistance, and the conductor can work normally without signal interruption. Its strength and conductivity can meet normal working requirements at 1000°C.

[0056] from Figure 5 It can be seen that after the composite wire monofilament in comparative example 1 worked for a long time at 1000°C, the conductor surface morphology showed regular slight oxidation damage; under the same test conditions, the composite wire monofilament in comparative example 2 had the same conductor surface morphology as Figure 5 The lifespans of the above embodiments are similar, but are much shorter than those of embodiments 1 to 4.

[0057] In addition, from Figure 6 It can be seen that after the composite wire monofilament in Comparative Example 3 worked at 1000°C for a short time, part of the conductor surface became damaged and could not work normally.

[0058] In addition, the comprehensive tensile strength of the composite wire monofilaments of Examples 1 to 4 of the present invention under high temperature conditions of 600-750° C. is not less than 300 MPa.

[0059] In summary, the stranded wire conductor in the present invention saves space and weight and can maintain high conductivity, corrosion resistance and relatively stable signal transmission performance, especially in a high temperature environment of 800-1000°C.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high temperature corrosion resistant stranded conductor, characterized in that: The stranded conductor is composed of a plurality of composite wire monofilaments twisted together, wherein the composite wire monofilaments are composed of a highly conductive core wire (1) and a high-temperature corrosion-resistant alloy (2) wrapped around the core wire (1), so that the stranded conductor can maintain strength and transmit signals for a long time in a high-temperature atmospheric environment below 1000°C; The highly conductive core wire (1) is copper or a copper alloy; The composition of the high temperature corrosion resistant alloy (2) is 60% to 75% nickel, 10.0% to 20.0% chromium, 5% to 15% molybdenum, 0.5% to 10% of the total amount of tantalum and niobium, 0.5% to 10% of tungsten, 2.0% to 7.0% aluminum, 0.1% to 1.0% titanium, 0.1% to 2.0% iron, and the remainder is inevitable trace impurities, the total weight of which is not more than 0.5%, and the oxygen content is less than 9 ppm.

2. A high temperature corrosion resistant stranded conductor according to claim 1, characterized in that: The composition of the high temperature corrosion resistant alloy (2) is, by weight, 60% to 75% nickel, 10.0% to 20.0% chromium, 6% to 10% molybdenum, 2% to 3% tantalum, 1.5% niobium, 4% to 5% tungsten, 2.0% to 7.0% aluminum, 0.1% to 1.0% titanium, 0.1% to 2.0% iron, and the remainder is inevitable trace impurities, the total weight of which is no more than 0.5%, and the oxygen content is less than 9 ppm.

3. The high temperature corrosion resistant stranded conductor according to claim 1, characterized in that: The cross-sectional area of ​​the core wire (1) in the composite wire monofilament accounts for 20% to 50% of the total area.

4. The high temperature corrosion resistant stranded conductor according to claim 1, characterized in that: The diameter of the composite line monofilament is 0.08-0.5 mm.

5. The high temperature corrosion resistant stranded conductor according to claim 1, characterized in that: The tensile strength of the single filament of the composite wire at 20° C. is greater than 400 MPa, the conductivity is greater than 20%, and the elongation is greater than 2%.

6. The high temperature corrosion resistant stranded conductor according to claim 1, characterized in that: The comprehensive tensile strength of the monofilament of the composite line under high temperature conditions is as follows: the tensile strength at 1000°C is not less than 50Mpa, the tensile strength at 900°C is not less than 80Mpa, the tensile strength at 800°C is not less than 150Mpa, and the tensile strength at 600-750°C is not less than 300Mpa.

7. The high temperature corrosion resistant stranded conductor according to claim 1, characterized in that: The copper alloy is a copper-silver alloy, and the composition of the copper-silver alloy is as follows by weight: silver 1% to 6%, the remainder is copper and inevitable impurities, the total weight of the impurities is not more than 0.05%, and the oxygen content is less than 9 ppm; the highly conductive core wire (1) has a tensile strength of not less than 300 MPa after annealing, and a conductivity greater than 80%; the conductivity of the composite wire single wire under the working condition of 600-1000°C is not less than 10%.

8. The high temperature corrosion resistant stranded conductor according to claim 1, characterized in that: The core wire (1) is copper; the electrical conductivity of the composite wire single wire under the working condition of 600-1000°C is not less than 15%.

9. A method for manufacturing a high temperature corrosion resistant stranded conductor, characterized in that: The following steps are involved: S1, manufacturing core wire (1); S2. Manufacturing of high temperature corrosion resistant alloy (2) pipes: 2.

1. Tube making: The high temperature corrosion resistant alloy (2) tube blank is made by vacuum casting and perforation, and necessary heat treatment is performed; 2.2 Ring rolling: Ring rolling the tube billet to reduce its diameter and wall thickness, and refine the grains to obtain a rolled tube; 2.

3. Drawing: Drawing the corrosion-resistant alloy tube billet after ring rolling to further reduce its diameter to obtain a drawn tube; 2.

4. Polishing and cleaning: polish and clean the inner wall of the drawn tube blank; S3. Manufacturing composite line: 3.

1. Pipe threading: inserting the copper-silver alloy core wire (1) obtained in step 1.4 into the high-temperature corrosion-resistant alloy (2) tube obtained in step 2.4 to obtain an initial composite wire; 3.

2. Drawing: The initial composite wire obtained in step 3.1 is subjected to drawing treatment so that the core wire (1) and the high temperature corrosion resistant alloy (2) tube are closely attached; 3.3, bright annealing: bright annealing the product obtained in step 3.2; 3.4, repeating steps 3.2 and 3.3 in sequence until a composite wire monofilament with a desired outer diameter is obtained; 3.

5. Heat treatment: heat treatment of the composite wire monofilament under inert gas protection; S4. Manufacturing high temperature corrosion resistant stranded wire: 4.

1. Twisting: Twisting a plurality of composite wire monofilaments obtained in step 3.5 to obtain a high temperature corrosion resistant twisted wire conductor; 4.

2. Heat treatment: The high temperature corrosion resistant stranded wire conductor is subjected to inert gas protection heat treatment.

10. The manufacturing method according to claim 9, characterized in that: In step 3.2, the total deformation rate of each drawing does not exceed 40%.

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