Low-deformation composite alloy double-net heating wire and preparation method thereof

Abstract

This invention discloses a low-deformation composite alloy double-mesh heating wire and its preparation method, which relates to the field of precision electric heating element technology. It includes an integrated, seamlessly fused double-layer mesh structure, comprising an inner micron-level precision heating mesh and an outer ultra-thin, high-strength protective mesh. The outer ultra-thin, high-strength protective mesh and the inner micron-level precision heating mesh are seamlessly fused together over the entire surface. The composite alloy contains the following components by mass percentage: chromium 18-20%, nickel 9-11%, magnesium 2.0-2.4%, lithium 0.4-0.6%, silicon 0.8-1.2%, with the balance being iron. This invention solves the problems of easy deformation, poor flatness, and the inability to balance lightweight and strength in traditional ultra-thin heating wires by using a seamlessly fused double-layer mesh constraint structure combined with an optimized modified composite alloy formula. This significantly reduces the product deformation rate and improves heating uniformity and structural stability.

Description

Technical Field

[0001] This invention belongs to the technical field of precision electric heating elements, and particularly relates to a low-deformation composite alloy double-mesh heating wire and its preparation method. Background Technology

[0002] Currently, most micro-precision heating wires on the market adopt a single-layer metal mesh structure or a conventional double-layer composite structure, with materials mainly consisting of traditional nickel-chromium alloys and iron-chromium-aluminum alloys. Existing technologies have many core shortcomings in practical applications, making them unsuitable for the demands of high-precision micro-heating scenarios.

[0003] First, in pursuit of ultra-thin and lightweight effects, traditional single-layer metal heating meshes significantly reduce the thickness and structural strength of the wires. This makes the heating wires prone to stretching deformation, surface wrinkles, and mesh warping during processing, heating, and hot and cold cycles. Large deformation errors directly result in uneven temperature distribution in the heating area and large deviations in local hot spots, seriously affecting the heating accuracy and operational stability of precision equipment.

[0004] Secondly, existing double-layer heating mesh structures are mostly split hollow structures, adhesive composite structures, or partially spot-welded fixed structures. The two mesh layers cannot achieve a seamless fit over the entire area, resulting in gaps, protrusions, and stress concentration points. Under long-term high-temperature operation, they are prone to delamination, peeling, and local deformation, leading to poor flatness and structural stability. At the same time, traditional double-layer meshes are generally too thick, resulting in poor weight reduction and making them unsuitable for the assembly requirements of miniaturized and ultra-thin equipment.

[0005] Finally, the traditional electrothermal alloy formulation system is simple. Conventional nickel-chromium and iron-chromium-aluminum alloys have high density and insufficient lightweight performance, and poor structural rigidity and weak oxidation resistance in ultra-thin states. Conventional alloy formulations have not optimized the element ratio for ultra-thin double-mesh structures, and cannot simultaneously take into account the comprehensive performance of lightweight, low deformation, high oxidation resistance and high structural strength. This results in the short service life and rapid precision decay of existing heating wires, which cannot meet the long-term stable precision heating requirements.

[0006] In summary, existing technologies suffer from technical drawbacks such as high deformation rate, poor flatness, insufficient lightweight, weak oxidation resistance, and unstable heating precision. There is an urgent need to develop a composite alloy double-mesh heating wire that combines ultra-thin lightweight, ultra-low deformation, high stability, and high precision, as well as its preparation method. Summary of the Invention

[0007] The purpose of this invention is to provide a low-deformation composite alloy double-mesh heating wire and its preparation method. This invention solves the problems of easy deformation, poor flatness, and the inability to balance lightweight and strength in traditional ultra-thin heating wires by using a double-layer mesh with a seamless fusion constraint structure and an optimized modified composite alloy formula. This significantly reduces the product deformation rate, improves the uniformity and accuracy of heating, and enhances structural stability. At the same time, this invention also has excellent lightweight performance and high-temperature oxidation resistance. The finished product has high dimensional accuracy, good batch consistency, and a longer service life, which can fully meet the long-term high-precision and stable use requirements of micro precision heating equipment.

[0008] To achieve the above objectives, the present invention provides the following technical solution: A low-deformation composite alloy double-mesh heating wire includes an integrated, seamlessly fused double-layer mesh structure. The double-layer mesh includes an inner micron-level precision heating mesh and an outer ultra-thin high-strength protective mesh. The outer ultra-thin high-strength protective mesh and the inner micron-level precision heating mesh are seamlessly bonded and fused together throughout the entire area.

[0009] As a preferred embodiment of the present invention, the composite alloy contains the following percentages by mass: 18-20% chromium, 9-11% nickel, 2.0-2.4% magnesium, 0.4-0.6% lithium, 0.8-1.2% silicon, with the balance being iron.

[0010] In this invention, chromium, a core element for anti-oxidation and corrosion resistance, forms a dense protective oxide film on the alloy surface, effectively preventing oxidation damage and corrosion failure of the ultra-thin wire under high-temperature energized conditions. Simultaneously, it enhances the hardness and structural rigidity of the alloy matrix, suppresses thermal expansion and contraction deformation of the ultra-thin mesh, reduces the overall deformation rate, and improves the long-term working stability of the heating wire. Nickel stabilizes the alloy's metallographic structure, improves its toughness and fatigue resistance, and prevents brittle fracture and cracking of the ultra-thin wire during repeated heating and stress stretching. It also optimizes the alloy's electrical conductivity uniformity, ensuring consistent heating across all areas of the mesh, eliminating localized temperature deviations, and meeting precision heating requirements. Magnesium, a lightweight core element, significantly reduces the overall density of the composite alloy, achieving… The heating wire has been upgraded to be lightweight; at the same time, the internal grain structure of the alloy can be refined, eliminating internal pores and impurities generated during melting and rolling, improving the density and uniformity of the alloy matrix, and reducing the risk of structural deformation; the lithium element used is an ultra-lightweight element, which, together with magnesium, further reduces the alloy density, resulting in a significant weight reduction compared to traditional electric heating alloys; at the same time, it can optimize the alloy rolling processing performance, improve the forming accuracy of ultra-thin wires, and avoid problems such as uneven thickness and warping deformation during the rolling of ultra-thin structures; the silicon element used can strengthen the alloy structural strength and creep resistance, inhibit grain slippage under high temperature conditions, and prevent high-temperature creep deformation of ultra-thin mesh; at the same time, it can help improve the alloy's oxidation resistance, and form a composite protective layer with chromium to extend the service life of the heating wire.

[0011] As a preferred embodiment of the present invention, the composite alloy has the following optimal composition by mass percentage: 19% chromium, 10% nickel, 2.2% magnesium, 0.5% lithium, 1.0% silicon, with the balance being iron.

[0012] As a preferred embodiment of the present invention, the alloy density of any proportion within the range of composite alloy components is ≤7.2 g / cm³. 3 .

[0013] As a preferred embodiment of the present invention, the total thickness of the double-layer mesh is 0.15-0.3mm, the thickness of each single layer of the double-layer mesh is 0.075-0.15mm, and the mesh count of the double-layer mesh is 200-500 meshes.

[0014] As a preferred embodiment of the present invention, the composite alloy contains the following components by mass percentage: chromium 18-20%, nickel 9-11%, magnesium 2.0-2.4%, lithium 0.4-0.6%, silicon 0.8-1.2%, titanium 0.2-0.4%, with the balance being iron.

[0015] This invention also provides titanium, which can refine alloy grains, further improve the high-temperature structural stability and bonding strength of the alloy, and increase the upper limit of the alloy's resistance to high-temperature oxidation; at the same time, it enhances the bonding force of the double-layer mesh fusion interface, avoids stress cracking in the fusion area, and is suitable for harsh working conditions of high temperature and long-term continuous operation.

[0016] As a preferred embodiment of the present invention, the composite alloy has the following optimal composition by mass percentage: 19% chromium, 10% nickel, 2.2% magnesium, 0.5% lithium, 1.0% silicon, 0.3% titanium, with the balance being iron.

[0017] As a preferred embodiment of the present invention, the inner micron-level precision heating mesh has a pore size of 5-20 μm, and the outer ultra-thin high-strength protective mesh has a pore size of 20-50 μm.

[0018] This invention also provides a method for preparing a low-deformation composite alloy double-mesh heating wire, which includes the following steps based on the heating wire: S1. Alloy Refining: Add the corresponding mass percentages of chromium, nickel, magnesium, lithium, silicon, and iron metal raw materials, and use a high-purity vacuum melting process to melt the composite alloy. The melting vacuum degree is ≤5×10- 3 Pa yields a homogeneous alloy billet; S2. Ultra-thin rolling: The alloy billet is rolled using an 8-12 pass multi-pass micro-rolling process, with a deformation of 5-10% per pass, to obtain ultra-thin flat wire with a thickness error controlled within ±0.01mm. S3. Precision weaving: High-precision CNC weaving equipment is used to weave an inner layer of micron-level precision heating mesh and an outer layer of ultra-thin high-strength protective mesh. S4. Full-area fusion: Using laser micro-melting fillerless self-fusion welding process, under the conditions of fusion temperature of 1200-1400℃ and fusion spot diameter of 0.05-0.1mm, the double-layer mesh body is fully seamlessly bonded and fused, and the mesh body has no protrusions or stress concentration points after forming. S5. Flattening and Shaping: After precision flattening using a pressure of 0.5-1.0MPa, the product is placed in a low-temperature environment of 150-250℃ for 30-60 minutes to complete the low-temperature shaping and obtain the finished heating wire.

[0019] As a preferred embodiment of the present invention, the following steps are included: S1. Alloy Refining: Add the corresponding mass percentages of chromium, nickel, magnesium, lithium, silicon, titanium, and iron metal raw materials, and use a high-purity vacuum melting process to melt the composite alloy. The melting vacuum degree is ≤5×10- 3 Pa yields a homogeneous alloy billet; S2. Ultra-thin rolling: The alloy billet is rolled using an 8-12 pass multi-pass micro-rolling process, with a deformation of 5-10% per pass, to obtain ultra-thin flat wire with a thickness error controlled within ±0.01mm. S3. Precision weaving: High-precision CNC weaving equipment is used to weave an inner layer of micron-level precision heating mesh and an outer layer of ultra-thin high-strength protective mesh. S4. Full-area fusion: Using laser micro-melting fillerless self-fusion welding process, under the conditions of fusion temperature of 1200-1400℃ and fusion spot diameter of 0.05-0.1mm, the double-layer mesh body is fully seamlessly bonded and fused, and the mesh body has no protrusions or stress concentration points after forming. S5. Flattening and Shaping: After precision flattening using a pressure of 0.5-1.0MPa, the product is placed in a low-temperature environment of 150-250℃ for 30-60 minutes to complete the low-temperature shaping and obtain the finished heating wire.

[0020] In summary, the beneficial technical effects of the present invention are as follows: 1. Adopting a double-layer mesh structure with seamless and traceless fusion, relying on the synergistic constraint effect of the double mesh, combined with precision rolling and double shaping processes, the overall deformation rate of the product is greatly reduced, the dimensional accuracy is extremely high, there are no stress concentration points, and there are no deformation or delamination problems under long-term hot and cold cycle conditions.

[0021] 2. By modifying the alloy with magnesium and lithium as dual lightweight elements, the alloy density is significantly reduced, achieving an ultra-thin and lightweight structure. At the same time, by relying on chromium and silicon elements to strengthen the rigidity of the matrix, the industry problem of not being able to balance the lightweight and structural strength of traditional ultra-thin heating wires is solved, making it suitable for the narrow assembly space of micro-equipment.

[0022] 3. The chromium and silicon composite antioxidant system, combined with the titanium element modification scheme, can further improve the high temperature oxidation resistance, effectively inhibit high temperature oxidation damage, improve the continuous working stability and service life of the heating wire, and reduce equipment operation and maintenance costs. Detailed Implementation

[0023] The present invention will now be described in further detail.

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] This invention provides a technical solution comprising an integrated, seamlessly fused double-layer mesh structure, wherein the double-layer mesh includes an inner micron-level precision heating mesh and an outer ultra-thin high-strength protective mesh, wherein the outer ultra-thin high-strength protective mesh and the inner micron-level precision heating mesh are seamlessly bonded and fused together throughout the entire area.

[0026] The composite alloy contains the following percentages by mass: chromium 18-20%, nickel 9-11%, magnesium 2.0-2.4%, lithium 0.4-0.6%, silicon 0.8-1.2%, with the balance being iron; The optimal composition is: 19% chromium, 10% nickel, 2.2% magnesium, 0.5% lithium, 1.0% silicon, with the balance being iron. Under this composition, the alloy density is ≤7.2 g / cm³. 3 .

[0027] Prepared using the following steps: S1. Alloy Refining: Add the corresponding mass percentages of chromium, nickel, magnesium, lithium, silicon, and iron metal raw materials, and use a high-purity vacuum melting process to melt the composite alloy. The melting vacuum degree is ≤5×10- 3 Pa yields a homogeneous alloy billet; S2. Ultra-thin rolling: The alloy billet is rolled using an 8-12 pass multi-pass micro-rolling process, with a deformation of 5-10% per pass, to obtain ultra-thin flat wire with a thickness error controlled within ±0.01mm. S3. Precision weaving: High-precision CNC weaving equipment is used to weave an inner layer of micron-level precision heating mesh and an outer layer of ultra-thin high-strength protective mesh. S4. Full-area fusion: Using laser micro-melting fillerless self-fusion welding process, under the conditions of fusion temperature of 1200-1400℃ and fusion spot diameter of 0.05-0.1mm, the double-layer mesh body is fully seamlessly bonded and fused, and the mesh body has no protrusions or stress concentration points after forming. S5. Flattening and Shaping: After precision flattening using a pressure of 0.5-1.0MPa, the product is placed in a low-temperature environment of 150-250℃ for 30-60 minutes to complete the low-temperature shaping and obtain the finished heating wire.

[0028] The present invention provides a second modified alloy scheme, wherein the composite alloy contains the following components by mass percentage: chromium 18-20%, nickel 9-11%, magnesium 2.0-2.4%, lithium 0.4-0.6%, silicon 0.8-1.2%, titanium 0.2-0.4%, and the balance being iron; The optimal ratio is: 19% chromium, 10% nickel, 2.2% magnesium, 0.5% lithium, 1.0% silicon, 0.3% titanium, with the balance being iron.

[0029] Prepared using the following steps: S1. Alloy Refining: Add the corresponding mass percentages of chromium, nickel, magnesium, lithium, silicon, titanium, and iron metal raw materials, and use a high-purity vacuum melting process to melt the composite alloy. The melting vacuum degree is ≤5×10- 3 Pa yields a homogeneous alloy billet; S2. Ultra-thin rolling: The alloy billet is rolled using an 8-12 pass multi-pass micro-rolling process, with a deformation of 5-10% per pass, to obtain ultra-thin flat wire with a thickness error controlled within ±0.01mm. S3. Precision weaving: High-precision CNC weaving equipment is used to weave an inner layer of micron-level precision heating mesh and an outer layer of ultra-thin high-strength protective mesh. S4. Full-area fusion: Using laser micro-melting fillerless self-fusion welding process, under the conditions of fusion temperature of 1200-1400℃ and fusion spot diameter of 0.05-0.1mm, the double-layer mesh body is fully seamlessly bonded and fused, and the mesh body has no protrusions or stress concentration points after forming. S5. Flattening and Shaping: After precision flattening using a pressure of 0.5-1.0MPa, the product is placed in a low-temperature environment of 150-250℃ for 30-60 minutes to complete the low-temperature shaping and obtain the finished heating wire.

[0030] The total thickness of the double-layer mesh is 0.15-0.3mm, and the thickness of each single layer is 0.075-0.15mm, with a weaving mesh count of 200-500 meshes. The inner layer is a micron-level precision heating mesh with a pore size of 5-20μm, and the outer layer is an ultra-thin high-strength protective mesh with a pore size of 20-50μm, forming a double-mesh synergistic structure with a precision heating inner layer and a constraint and protection outer layer.

[0031] Example 1 Composite alloy by weight percentage: 19% chromium, 10% nickel, 2.2% magnesium, 0.5% lithium, 1.0% silicon, with the balance being iron.

[0032] Structural parameters: The total thickness of the double-layer mesh is 0.2 mm, the thickness of a single layer is 0.1 mm, and the mesh count is 350 meshes; the inner heating mesh has a pore size of 12 μm, and the outer protective mesh has a pore size of 35 μm. The finished heating wire is prepared using the above preparation method.

[0033] Example 2 Composite alloy by weight percentage: 18% chromium, 11% nickel, 2.0% magnesium, 0.6% lithium, 0.8% silicon, with the balance being iron.

[0034] The preparation method and structural parameters are the same as in Example 1.

[0035] Example 3 Composite alloy by weight percentage: 19% chromium, 10% nickel, 2.2% magnesium, 0.5% lithium, 1.0% silicon, 0.3% titanium, with the balance being iron.

[0036] The preparation method and structural parameters are the same as in Example 1.

[0037] Example 4 Composite alloy by weight percentage: 20% chromium, 9% nickel, 2.4% magnesium, 0.4% lithium, 1.2% silicon, 0.2% titanium, with the balance being iron.

[0038] The preparation method and structural parameters are the same as in Example 1.

[0039] Comparative Example 1 It is made of conventional Cr20Ni80 alloy, with a single layer thickness of 0.2mm and a mesh count of 350, using conventional weaving and shaping processes.

[0040] Comparative Example 2 It is made of ordinary iron-chromium-aluminum alloy, with a double-layer mesh adhesive composite, a total thickness of 0.4mm, and has a gap-layered structure. It is prepared by conventional process.

[0041] Comparative Example 3 Alloy composition: 19% chromium, 10% nickel, 1.0% silicon, balance iron, magnesium and lithium elements removed, the remaining structure and process are the same as in Example 1.

[0042] All embodiments and comparative samples of this invention were tested using unified national standards and industry-standard precision testing methods, a unified testing environment (room temperature 25℃, normal pressure), and unified cyclic testing conditions (500 cycles of hot and cold cycling from room temperature to 300℃). The specific testing methods for each performance aspect are as follows: Overall deformation rate detection: A high-precision laser dimension measuring instrument is used to test the initial planar dimensions of the sample and the ultimate deformation dimensions after 500 thermal cycles. The ratio of the maximum deformation to the original dimension is calculated to obtain the overall deformation rate.

[0043] Alloy density testing: Using an Archimedes displacement method precision density tester, three parallel tests were performed on each alloy sample, and the average value was taken as the final density data.

[0044] Flatness error detection: A fully automatic flatness detector is used to scan the entire area of ​​the finished mesh, collect the height difference data of the entire area, and calculate the maximum flatness error value.

[0045] Heating uniformity (heating temperature difference) detection: A high-precision infrared thermal imaging thermometer was used. After the sample was powered on and operated at a constant power for 30 minutes, the temperature of the entire mesh was collected, and the deviation values ​​of the highest temperature, lowest temperature and average temperature were statistically analyzed.

[0046] Antioxidant temperature test: A stepped high-temperature constant temperature test was conducted using a programmed temperature rise muffle furnace. The highest temperature at which the sample remained at a constant temperature for 2 hours without peeling, oxidation shedding, or performance degradation was taken as the antioxidant limit temperature.

[0047] Structural stability testing: The sample is subjected to 500 cycles of hot and cold in a high and low temperature alternating test chamber. Visual inspection combined with instrument testing is used to check for defects such as wrinkles, warping, delamination, and cracking.

[0048] After testing, the performance data of the finished heating wire was obtained as shown in the table below:

[0049] Based on the data in the table above, the deformation rate of the finished products in each embodiment of the present invention is controlled within 0.15%, which is far superior to the 0.62% to 1.25% of the prior art comparative examples. This is due to the mutually constrained structure formed by the full-domain laser-assisted seamless fusion of the double-layer mesh, combined with the optimized alloy grain refinement design, which suppresses the thermal expansion and contraction, and tensile slippage problems of ultra-thin wires from both structural and material dimensions. The titanium-modified formulation further enhances the grain bonding force, resulting in optimal deformation control.

[0050] This invention utilizes the synergistic modification of magnesium and lithium, two lightweight elements, resulting in alloy densities ≤7.2 g / cm³ in all embodiments. 3 Compared to traditional nickel-chromium and iron-chromium-aluminum heating alloys, it reduces weight by more than 10%, completely solving the problem that traditional precision heating wires cannot achieve both ultra-thinness and lightweight, and is fully compatible with the lightweight assembly needs of micro precision equipment and wearable devices.

[0051] The maximum temperature difference of the finished product of this invention is only ±0.4℃, which is far superior to the temperature difference deviation of more than ±1.0℃ of traditional products. The alloy composition of this invention is uniform, and the double-mesh structure is flat and free of stress defects. When energized, there is no local heat accumulation or uneven heating caused by deformation, which can meet the high-precision constant temperature control requirements of medical aesthetic heating heads, micro sensors, precision instruments and other applications.

[0052] The basic formula relies on a chromium-silicon composite antioxidant system, which significantly improves the antioxidant temperature compared to traditional alloys. The titanium-modified formula can increase the antioxidant temperature to 650℃, greatly expanding the high-temperature operating range of the product, effectively avoiding the problems of oxidation damage and performance degradation during long-term high-temperature operation, and significantly improving the service life of the product.

[0053] This invention employs a laser-based, filler-free self-fusion process, resulting in a double-layer mesh with no gaps, protrusions, delamination, or stress concentration points. This differs from the inherent defects of traditional adhesive or spot-welded double-layer structures. After 500 cycles of thermal cycling, the structure remains intact, with no attenuation in dimensional accuracy or heating performance, leading to higher consistency and reliability in mass production.

[0054] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0055] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-deformation composite alloy bimetallic heating wire, characterized in that, It includes an integrated, seamlessly fused double-layer mesh structure, comprising an inner micron-level precision heating mesh and an outer ultra-thin, high-strength protective mesh, wherein the outer ultra-thin, high-strength protective mesh and the inner micron-level precision heating mesh are seamlessly bonded and fused together throughout the entire area.

2. The low-deformation composite alloy bimetallic heating wire according to claim 1, wherein, The composite alloy contains the following percentages by mass: 18-20% chromium, 9-11% nickel, 2.0-2.4% magnesium, 0.4-0.6% lithium, 0.8-1.2% silicon, with the balance being iron.

3. The low-deformation composite alloy bicomponent heater wire of claim 2, wherein, The optimal composition of the composite alloy by mass percentage is as follows: 19% chromium, 10% nickel, 2.2% magnesium, 0.5% lithium, 1.0% silicon, with the balance being iron.

4. The low-deformation composite alloy bi-mesh heating element of claim 1 wherein, The density of the alloy in any proportion within the range of the composite alloy component is ≤ 7.2 g / cm 3 .

5. The low-deformation composite alloy double-mesh heating wire according to claim 1, characterized in that, The total thickness of the double-layer mesh is 0.15-0.3mm, the thickness of each single layer of the double-layer mesh is 0.075-0.15mm, and the mesh count of the double-layer mesh is 200-500 meshes.

6. The low-deformation composite alloy double-mesh heating wire according to claim 1, characterized in that, The composite alloy contains the following components by mass percentage: chromium 18-20%, nickel 9-11%, magnesium 2.0-2.4%, lithium 0.4-0.6%, silicon 0.8-1.2%, titanium 0.2-0.4%, with the balance being iron.

7. The low-deformation composite alloy bimetallic heating wire according to claim 6, wherein The optimal composition of the composite alloy by mass percentage is as follows: 19% chromium, 10% nickel, 2.2% magnesium, 0.5% lithium, 1.0% silicon, 0.3% titanium, with the balance being iron.

8. The low-deformation composite alloy bimetallic heating wire according to claim 1, wherein The inner micron-level precision heating mesh has a pore size of 5-20μm, and the outer ultra-thin high-strength protective mesh has a pore size of 20-50μm.

9. A method for producing a low-deformation composite alloy double-net heating wire based on the heating wire according to any one of claims 1 to 8, characterized by, Includes the following steps: S1. Alloy Refining: Add the corresponding mass percentages of chromium, nickel, magnesium, lithium, silicon, and iron metal raw materials, and use a high-purity vacuum melting process to melt the composite alloy. The melting vacuum degree is ≤5×10 -3 Pa yields a homogeneous alloy billet; S2. Ultra-thin rolling: The alloy billet is rolled using an 8-12 pass multi-pass micro-rolling process, with a deformation of 5-10% per pass, to obtain ultra-thin flat wire with a thickness error controlled within ±0.01mm. S3. Precision weaving: High-precision CNC weaving equipment is used to weave an inner layer of micron-level precision heating mesh and an outer layer of ultra-thin high-strength protective mesh. S4. Full-area fusion: Using laser micro-melting fillerless self-fusion welding process, under the conditions of fusion temperature of 1200-1400℃ and fusion spot diameter of 0.05-0.1mm, the double-layer mesh body is fully seamlessly bonded and fused, and the mesh body has no protrusions or stress concentration points after forming. S5. Flattening and Shaping: After precision flattening using a pressure of 0.5-1.0MPa, the product is placed in a low-temperature environment of 150-250℃ for 30-60 minutes to complete the low-temperature shaping and obtain the finished heating wire.

10. The method of claim 9, wherein, Includes the following steps: S1. Alloy Refining: Add the corresponding mass percentages of chromium, nickel, magnesium, lithium, silicon, titanium, and iron metal raw materials, and use a high-purity vacuum melting process to melt the composite alloy. The melting vacuum degree is ≤5×10 -3 Pa yields a homogeneous alloy billet; S2. Ultra-thin rolling: The alloy billet is rolled using an 8-12 pass multi-pass micro-rolling process, with a deformation of 5-10% per pass, to obtain ultra-thin flat wire with a thickness error controlled within ±0.01mm. S3. Precision weaving: High-precision CNC weaving equipment is used to weave an inner layer of micron-level precision heating mesh and an outer layer of ultra-thin high-strength protective mesh. S4. Full-area fusion: Using laser micro-melting fillerless self-fusion welding process, under the conditions of fusion temperature of 1200-1400℃ and fusion spot diameter of 0.05-0.1mm, the double-layer mesh body is fully seamlessly bonded and fused, and the mesh body has no protrusions or stress concentration points after forming. S5. Flattening and Shaping: After precision flattening using a pressure of 0.5-1.0MPa, the product is placed in a low-temperature environment of 150-250℃ for 30-60 minutes to complete the low-temperature shaping and obtain the finished heating wire.

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