A tungsten alloy composite with enhanced electromagnetic shielding effectiveness and its use in aircraft electronics

Abstract

The application discloses a tungsten alloy composite material with enhanced electromagnetic shielding performance and application thereof in aircraft electronic equipment, and belongs to the technical field of electromagnetic shielding of tungsten alloy composite materials. The tungsten alloy composite material with enhanced electromagnetic shielding performance and application thereof in aircraft electronic equipment adds nitrogen-doped carbon nanotubes, improves the electromagnetic shielding performance and mechanical properties. In the microstructure design, anisotropic material is used to realize performance optimization in different directions. Through reasonable formula and processing technology, the composite material significantly improves the absorption and reflection ability of electromagnetic waves on the basis of maintaining the excellent mechanical properties of the tungsten alloy. When the material is applied in aircraft electronic equipment, it can not only effectively shield high-frequency electromagnetic waves and reduce electromagnetic interference, but also has good high-temperature resistance and corrosion resistance, ensuring the long-term stable operation of the equipment, and is suitable for high-performance requirements in the fields of aviation and aerospace.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic shielding technology for tungsten alloy composite materials, and more specifically, to a tungsten alloy composite material with enhanced electromagnetic shielding effectiveness and its application in aircraft electronic equipment. Background Technology

[0002] With the continuous development of modern technology, especially in the aerospace field, higher requirements are being placed on the electromagnetic shielding performance of electronic devices. Tungsten alloys, due to their excellent density, radiation resistance, and high-temperature resistance, have been widely used in aircraft electronic equipment. However, with the increasing complexity of electronic devices, higher demands are being placed on the electromagnetic shielding effectiveness of tungsten alloy composite materials. The electromagnetic shielding performance of traditional tungsten alloy materials is insufficient to meet the needs of modern aircraft; therefore, there is an urgent need to develop tungsten alloy composite materials with stronger electromagnetic shielding performance.

[0003] Early tungsten alloy composites relied primarily on adding metal or ceramic particles to the metal matrix to improve their mechanical and electrical properties. However, this traditional composite method can only improve the hardness and strength of the material to a certain extent, with limited effect on enhancing electromagnetic shielding effectiveness. In recent years, nanomaterials have attracted widespread attention as an important direction for enhancing electromagnetic shielding effects, especially the introduction of nanomaterials such as carbon nanotubes and graphene, which provides new ways to improve the electromagnetic shielding performance of tungsten alloy composites.

[0004] Nevertheless, current research still has some limitations. First, tungsten alloy composites are costly to produce on a large scale, and their stability and anti-aging properties need further improvement in certain application environments. Second, enhancing electromagnetic shielding effectiveness requires further research into the optimal doping methods of nanomaterials and their compatibility with tungsten alloys.

[0005] In the future, with advancements in nanomaterial preparation technology and continuous optimization of composite material processing techniques, the electromagnetic shielding effectiveness of tungsten alloy composites will be further improved, while production costs are also expected to decrease. By optimizing the microstructure of materials and introducing more novel functional materials, tungsten alloy composites will find wider applications in aerospace and other high-end electronic equipment fields. Summary of the Invention

[0006] The purpose of this invention is to provide a tungsten alloy composite material with enhanced electromagnetic shielding effectiveness and its application in aircraft electronic equipment, which has a high-efficiency electromagnetic shielding effect and excellent mechanical properties and high-temperature resistance.

[0007] A tungsten alloy composite material with enhanced electromagnetic shielding effectiveness and its application in aircraft electronic equipment, characterized by comprising the following steps: (1) Preparation of nitrogen-doped carbon nanotubes: Ammonia was selected as the nitrogen source, acetylene as the carbon source, and helium as the carrier gas. The reaction was carried out by plasma-enhanced chemical vapor deposition at 800-1000℃ and standard atmospheric pressure. The product was acid-washed with 1 mol / L nitric acid solution for 20-40 minutes, and then washed and dried with deionized water to obtain nitrogen-doped carbon nanotubes. (2) Preparation of modified nitrogen-doped carbon nanotubes: 3-aminopropyltriethoxysilane was dissolved in deionized water solvent, ultrasonically dispersed evenly, nitrogen-doped carbon nanotubes were added, pH was adjusted to 3-5 with 1 mol / L hydrochloric acid, and the reaction was stirred at 40-60℃ for 2-4 h. After centrifugation, the mixture was washed with deionized water and dried to obtain modified nitrogen-doped carbon nanotubes. (3) Preparation of tungsten alloy composite material slurry: Weigh 2-6 μm tungsten powder, 2-6 μm molybdenum powder and 2-6 μm nickel powder, premix and disperse them evenly using a ball mill, add modified nitrogen-doped carbon nanotubes, graphene and polytetrafluoroethylene, mix for 1-3 h using a high-energy ball mill, add deionized water solvent, mix evenly to obtain a slurry that can be coated. (4) Clean the tungsten alloy substrate in ethanol with ultrasonic cleaning for 6-10 minutes, dry it with nitrogen, then apply the slurry to its surface with a thickness of 60-100um, remove the air bubbles in the slurry by vacuum degassing, and then cure it to obtain the cured coating material. (5) Place the cured coating material in an electric field and perform a stretching process at 300-500℃ for 20-40 minutes at a stretching rate of 1-2 mm / s. After the stretching process, cure the material and then spray a layer of polytetrafluoroethylene coating on its surface to obtain a tungsten alloy composite material with enhanced electromagnetic shielding performance.

[0008] Preferably, in step (1), the ammonia flow rate is 60-100 sccm, the acetylene flow rate is 20-40 sccm, and the helium flow rate is 200-300 sccm.

[0009] Preferably, in step (2), the ratio of 3-aminopropyltriethoxysilane, deionized water solvent, and nitrogen-doped carbon nanotubes is 1-2g:80-120mL:10g.

[0010] Preferably, in step (3), the ratio of tungsten powder, molybdenum powder, nickel powder, modified nitrogen-doped carbon nanotubes, graphene, polytetrafluoroethylene, and deionized water solvent is 100g:8-12g:8-12g:4-6g:2-3g:8-12g:8-12mL.

[0011] Preferably, the curing conditions in step (4) are to place the product in an argon atmosphere and cure it at 140-180°C for 40-60 minutes, followed by natural cooling to room temperature.

[0012] Preferably, the electric field strength in step (5) is 600-1000V / cm.

[0013] Preferably, the curing conditions in step (5) are to place the product in an argon atmosphere and cure it at 1200-1600℃ for 2-4 hours, followed by a gradual cooling to room temperature.

[0014] Compared with the prior art, the advantages of the present invention are as follows: (1) In this invention, the electromagnetic shielding effectiveness of tungsten alloy composite material is significantly improved. Enhanced electromagnetic shielding effectiveness of nitrogen-doped carbon nanotubes: The incorporation of nitrogen-doped carbon nanotubes can significantly improve the electromagnetic shielding effectiveness of tungsten alloy composites. In addition to having excellent electrical conductivity, it can also form a more stable interface with tungsten-based alloys, thereby improving the absorption and shielding capabilities of electromagnetic waves. Synergistic enhancement effect of graphene: The addition of graphene further enhances the electromagnetic shielding effectiveness of the composite material. The two-dimensional structure and good electrical conductivity of graphene make the electromagnetic wave absorption and shielding effect of the composite material more significant in the high-frequency band. Advantages of anisotropic microstructure design: By designing anisotropic microstructures, nanoparticles can achieve a more optimized directional arrangement within the material, thereby more effectively improving electromagnetic shielding performance. This design helps to improve the uniformity and stability of electromagnetic shielding materials in different directions.

[0015] (2) In this invention, the mechanical properties of tungsten alloy composite materials are improved. Improved strength and toughness of composite materials: The mechanical properties of tungsten alloy composite materials are significantly improved after incorporating nitrogen-doped carbon nanotubes and graphene. Carbon nanotubes have excellent tensile strength and elastic modulus, which helps to improve the overall hardness, toughness and impact resistance of the material.

[0016] Enhanced interfacial bonding: The surface modification effect of silane coupling agents significantly improved the interfacial bonding between nitrogen-doped carbon nanotubes and the tungsten alloy matrix, enhanced the uniformity of the composite material, reduced crack propagation under stress, and thus improved its fatigue resistance. (3) In this invention, the high temperature resistance and stability of the tungsten alloy composite material are improved. Stability at high temperatures: Tungsten alloys themselves have excellent high-temperature resistance. After incorporating nitrogen-doped carbon nanotubes, the high-temperature stability of the composite material is further improved. In particular, nitrogen-doped carbon nanotubes can effectively enhance the thermal conductivity of the material under high-temperature conditions, which helps to prevent heat accumulation and local overheating when the material is working at high temperatures in the aircraft.

[0017] Enhanced radiation resistance: Since tungsten alloys themselves have strong radiation resistance, the radiation resistance of the composite material is further enhanced after doping with nanoparticles, making it suitable for electronic devices that operate in radiation environments for extended periods.

[0018] (4) In this invention, the tungsten alloy composite material has the potential for multifunctional applications. Adaptability of aircraft electronic equipment: The enhanced electromagnetic shielding effectiveness of composite materials makes them more suitable for use in aircraft electronic equipment, effectively preventing external electromagnetic interference and improving the reliability and stability of aircraft electronic systems.

[0019] Broad application prospects: In addition to its applications in aircraft electronics, this composite material also has broad application prospects in other high-end electronic and communication equipment. Its excellent electromagnetic shielding effectiveness and mechanical properties make it of significant practical value in many high-tech fields. Detailed Implementation

[0020] Example 1: (1) Preparation of nitrogen-doped carbon nanotubes: Ammonia was selected as the nitrogen source with a flow rate of 60 sccm, acetylene was selected as the carbon source with a flow rate of 20 sccm, and helium was selected as the carrier gas with a flow rate of 200 sccm. The reaction was carried out at 800℃ and standard atmospheric pressure using plasma-enhanced chemical vapor deposition. The obtained product was acid-washed with 1 mol / L nitric acid solution for 20 minutes, and then washed and dried with deionized water to obtain nitrogen-doped carbon nanotubes. (2) Preparation of modified nitrogen-doped carbon nanotubes: 1g of 3-aminopropyltriethoxysilane was dissolved in 80mL of deionized water solvent, ultrasonically dispersed evenly, 10g of nitrogen-doped carbon nanotubes were added, pH was adjusted to 3 with 1mol / L hydrochloric acid, the reaction was stirred at 40℃ for 2h, centrifuged, washed with deionized water and dried to obtain modified nitrogen-doped carbon nanotubes. (3) Preparation of tungsten alloy composite material slurry: Weigh 100g 2um tungsten powder, 8g 2um molybdenum powder and 8g 2um nickel powder, premix and disperse them evenly using a ball mill, add 4g modified nitrogen-doped carbon nanotubes, 2g graphene and 8g polytetrafluoroethylene, mix for 1h using a high-energy ball mill, add 8mL deionized water solvent, mix evenly to obtain a slurry that can be coated; (4) The tungsten alloy substrate was ultrasonically cleaned in ethanol for 6 minutes, dried with nitrogen, and then the slurry was scraped onto its surface with a thickness of 60 μm. The air bubbles in the slurry were removed by vacuum degassing, and the substrate was placed in an argon atmosphere and cured at 140°C for 40 minutes. The substrate was then naturally cooled to room temperature to obtain the cured coating material. (5) The cured coating material is placed in an electric field of 600V / cm and subjected to a stretching process at 300℃ for 20 minutes with a stretching rate of 1mm / s. After the stretching process, it is placed in an argon atmosphere and cured at 1200℃ for 2 hours. The temperature is then gradually reduced to room temperature, and a layer of polytetrafluoroethylene coating is sprayed on its surface to obtain a tungsten alloy composite material with enhanced electromagnetic shielding performance.

[0021] Example 2: (1) Preparation of nitrogen-doped carbon nanotubes: Ammonia was selected as the nitrogen source with a flow rate of 70 sccm, acetylene was selected as the carbon source with a flow rate of 25 sccm, and helium was selected as the carrier gas with a flow rate of 225 sccm. The reaction was carried out at 850℃ and standard atmospheric pressure using plasma-enhanced chemical vapor deposition. The obtained product was acid-washed with 1 mol / L nitric acid solution for 25 minutes, and then washed and dried with deionized water to obtain nitrogen-doped carbon nanotubes. (2) Preparation of modified nitrogen-doped carbon nanotubes: 1.25 g of 3-aminopropyltriethoxysilane was dissolved in 90 mL of deionized water solvent and ultrasonically dispersed evenly. 10 g of nitrogen-doped carbon nanotubes were added, and the pH was adjusted to 3.5 with 1 mol / L hydrochloric acid. The mixture was stirred at 45 °C for 2.5 h, centrifuged, washed with deionized water and dried to obtain modified nitrogen-doped carbon nanotubes. (3) Preparation of tungsten alloy composite material slurry: Weigh 100g of 3µm tungsten powder, 9g of 3µm molybdenum powder and 9g of 3µm nickel powder, premix and disperse them evenly using a ball mill, add 4.5g of modified nitrogen-doped carbon nanotubes, 2.25g of graphene and 9g of polytetrafluoroethylene, mix with a high-energy ball mill for 1.5h, add 9mL of deionized water solvent, mix evenly to obtain a slurry that can be coated; (4) The tungsten alloy substrate was ultrasonically cleaned in ethanol for 7 minutes, dried with nitrogen, and then the slurry was scraped onto its surface with a thickness of 70 μm. The air bubbles in the slurry were removed by vacuum degassing, and the substrate was placed in an argon atmosphere and cured at 150°C for 45 minutes. The substrate was then naturally cooled to room temperature to obtain the cured coating material. (5) The cured coating material is placed in an electric field of 700V / cm and subjected to a stretching process at 350℃ for 25 minutes with a stretching rate of 1.25mm / s. After the stretching process, it is placed in an argon atmosphere and cured at 1300℃ for 2.5h. The temperature is then gradually reduced to room temperature, and a layer of polytetrafluoroethylene coating is sprayed on its surface to obtain a tungsten alloy composite material with enhanced electromagnetic shielding performance.

[0022] Example 3: (1) Preparation of nitrogen-doped carbon nanotubes: Ammonia was selected as the nitrogen source with a flow rate of 80 sccm, acetylene was selected as the carbon source with a flow rate of 30 sccm, and helium was selected as the carrier gas with a flow rate of 250 sccm. The reaction was carried out at 900℃ and standard atmospheric pressure using plasma-enhanced chemical vapor deposition. The obtained product was acid-washed with 1 mol / L nitric acid solution for 30 minutes, and then washed and dried with deionized water to obtain nitrogen-doped carbon nanotubes. (2) Preparation of modified nitrogen-doped carbon nanotubes: 1.5g of 3-aminopropyltriethoxysilane was dissolved in 100mL of deionized water solvent, ultrasonically dispersed evenly, 10g of nitrogen-doped carbon nanotubes were added, pH was adjusted to 4 with 1mol / L hydrochloric acid, the reaction was stirred at 50℃ for 3h, centrifuged, washed with deionized water and dried to obtain modified nitrogen-doped carbon nanotubes; (3) Preparation of tungsten alloy composite material slurry: Weigh 100g of 4μm tungsten powder, 10g of 4μm molybdenum powder and 10g of 4μm nickel powder, premix and disperse them evenly using a ball mill, add 5g of modified nitrogen-doped carbon nanotubes, 2.5g of graphene and 10g of polytetrafluoroethylene, mix them for 2 hours using a high-energy ball mill, add 10mL of deionized water solvent, mix evenly to obtain a slurry that can be coated; (4) The tungsten alloy substrate was ultrasonically cleaned in ethanol for 8 minutes, dried with nitrogen, and then the slurry was scraped onto its surface with a thickness of 80 μm. The air bubbles in the slurry were removed by vacuum degassing, and the substrate was placed in an argon atmosphere and cured at 160°C for 50 minutes. The substrate was then naturally cooled to room temperature to obtain the cured coating material. (5) The cured coating material is placed in an electric field of 800V / cm and subjected to a stretching process at 400℃ for 30 minutes with a stretching rate of 1.5mm / s. After the stretching process, it is placed in an argon atmosphere and cured at 1400℃ for 3 hours. The temperature is then gradually reduced to room temperature, and a layer of polytetrafluoroethylene coating is sprayed on its surface to obtain a tungsten alloy composite material with enhanced electromagnetic shielding performance.

[0023] Example 4: (1) Preparation of nitrogen-doped carbon nanotubes: Ammonia was selected as the nitrogen source with a flow rate of 90 sccm, acetylene was selected as the carbon source with a flow rate of 35 sccm, and helium was selected as the carrier gas with a flow rate of 275 sccm. The reaction was carried out by plasma-enhanced chemical vapor deposition at 950℃ and standard atmospheric pressure. The obtained product was acid-washed with 1 mol / L nitric acid solution for 35 minutes, and then washed and dried with deionized water to obtain nitrogen-doped carbon nanotubes. (2) Preparation of modified nitrogen-doped carbon nanotubes: 1.75 g of 3-aminopropyltriethoxysilane was dissolved in 110 mL of deionized water solvent and ultrasonically dispersed evenly. 10 g of nitrogen-doped carbon nanotubes were added, and the pH was adjusted to 4.5 with 1 mol / L hydrochloric acid. The mixture was stirred at 55 °C for 3.5 h, centrifuged, washed with deionized water and dried to obtain modified nitrogen-doped carbon nanotubes. (3) Preparation of tungsten alloy composite material slurry: Weigh 100g of 5um tungsten powder, 11g of 5um molybdenum powder and 11g of 5um nickel powder, premix and disperse them evenly using a ball mill, add 5.5g of modified nitrogen-doped carbon nanotubes, 2.75g of graphene and 11g of polytetrafluoroethylene, mix with a high-energy ball mill for 2.5h, add 11mL of deionized water solvent, mix evenly to obtain a slurry that can be coated; (4) The tungsten alloy substrate was ultrasonically cleaned in ethanol for 9 minutes, dried with nitrogen, and then the slurry was scraped onto its surface with a thickness of 90 μm. The air bubbles in the slurry were removed by vacuum degassing, and the substrate was placed in an argon atmosphere and cured at 170°C for 55 minutes. The substrate was then naturally cooled to room temperature to obtain the cured coating material. (5) The cured coating material is placed in an electric field of 900V / cm and subjected to a stretching process at 450℃ for 35 minutes with a stretching rate of 1.75mm / s. After the stretching process, it is placed in an argon atmosphere and cured at 1500℃ for 3.5h. The temperature is then gradually reduced to room temperature, and a layer of polytetrafluoroethylene coating is sprayed on its surface to obtain a tungsten alloy composite material with enhanced electromagnetic shielding performance.

[0024] Example 5: (1) Preparation of nitrogen-doped carbon nanotubes: Ammonia was selected as the nitrogen source with a flow rate of 100 sccm, acetylene was selected as the carbon source with a flow rate of 40 sccm, and helium was selected as the carrier gas with a flow rate of 300 sccm. The reaction was carried out by plasma-enhanced chemical vapor deposition at 1000℃ and standard atmospheric pressure. The obtained product was acid-washed with 1 mol / L nitric acid solution for 40 minutes, and then washed and dried with deionized water to obtain nitrogen-doped carbon nanotubes. (2) Preparation of modified nitrogen-doped carbon nanotubes: 2g of 3-aminopropyltriethoxysilane was dissolved in 120mL of deionized water solvent, ultrasonically dispersed evenly, 10g of nitrogen-doped carbon nanotubes were added, pH was adjusted to 5 with 1mol / L hydrochloric acid, the reaction was stirred at 60℃ for 4h, centrifuged, washed with deionized water and dried to obtain modified nitrogen-doped carbon nanotubes; (3) Preparation of tungsten alloy composite material slurry: Weigh 100g of 6um tungsten powder, 12g of 6um molybdenum powder and 12g of 6um nickel powder, premix and disperse them evenly using a ball mill, add 6g of modified nitrogen-doped carbon nanotubes, 3g of graphene and 12g of polytetrafluoroethylene, mix for 3h using a high-energy ball mill, add 12mL of deionized water solvent, mix evenly to obtain a slurry that can be coated; (4) The tungsten alloy substrate was ultrasonically cleaned in ethanol for 10 minutes, dried with nitrogen, and then the slurry was scraped onto its surface with a thickness of 100 μm. The air bubbles in the slurry were removed by vacuum degassing, and the substrate was placed in an argon atmosphere and cured at 180°C for 60 minutes. The substrate was then naturally cooled to room temperature to obtain the cured coating material. (5) The cured coating material is placed in an electric field of 1000V / cm and subjected to a stretching process at 500℃ for 40 minutes with a stretching rate of 2mm / s. After the stretching process, it is placed in an argon atmosphere and cured at 1600℃ for 4 hours. The temperature is then gradually reduced to room temperature, and a layer of polytetrafluoroethylene coating is sprayed on its surface to obtain a tungsten alloy composite material with enhanced electromagnetic shielding performance.

[0025] Performance testing Electromagnetic shielding effectiveness test The materials obtained in Examples 1-5 were used to prepare disc samples with a diameter of 50 mm and a thickness of 2 mm. The surface was smoothed with sandpaper and cleaned using ultrasonic cleaning equipment. The samples were ensured to be dry and free of moisture. Electromagnetic shielding effectiveness (EMSE) testing was performed on the disc samples using an Agilent E4407B spectrum analyzer and an Agilent N5182A MXA microwave signal generator. The disc samples were placed in the test chamber of the instrument, and a 5 GHz microwave signal was used for testing, referring to the national standard GB / T 16636-2012. The test results are shown in the table below:

[0026] Mechanical property testing The materials obtained in Examples 1-5 were prepared into cuboid specimens of 10mm × 10mm × 50mm. The surfaces were smoothed with sandpaper and cleaned using an ultrasonic cleaner. The samples were ensured to be dry and free of moisture. Tensile tests were performed on the specimens using an Instron 3345 electronic universal testing machine with a tensile speed of 1 mm / min. The surface hardness of the specimens was tested using an HRA-1 Rockwell hardness tester, referring to national standards GB / T 228-2010 and GB / T 230.1-2018. The test results are shown in the table below:

[0027] Thermal stability performance test The materials obtained in Examples 1-5 were prepared into disc samples with a diameter of 510 mm and a thickness of 2 mm. The surface was smoothed with sandpaper, and the surface was cleaned with ultrasonic cleaning equipment. The samples were ensured to be dry and free of moisture. The thermal stability of the samples was tested using a TMA-type thermal dilatometer, set to 1000℃, in accordance with the national standard GB / T 9441-2009. The test results are shown in the table below:

[0028] Conductivity test The materials obtained in Examples 1-5 were prepared into cuboid samples of 10mm × 10mm × 50mm. The surfaces were smoothed with sandpaper and cleaned using ultrasonic cleaning equipment. The samples were ensured to be dry and free of moisture. The conductivity of the disc samples was tested using the four-probe method with a Jandel Multi-Function Test System four-probe conductivity meter, referring to the national standard GB / T 6064-2018. The test results are shown in the table below:

Claims

1. A tungsten alloy composite material with enhanced electromagnetic shielding effectiveness and its application in aircraft electronic equipment, characterized in that, Includes the following steps: (1) Preparation of nitrogen-doped carbon nanotubes: Ammonia was selected as the nitrogen source, acetylene as the carbon source, and helium as the carrier gas. The reaction was carried out by plasma-enhanced chemical vapor deposition at 800-1000℃ and standard atmospheric pressure. The product was acid-washed with 1 mol / L nitric acid solution for 20-40 minutes, and then washed and dried with deionized water to obtain nitrogen-doped carbon nanotubes. (2) Preparation of modified nitrogen-doped carbon nanotubes: 3-aminopropyltriethoxysilane was dissolved in deionized water solvent, ultrasonically dispersed evenly, nitrogen-doped carbon nanotubes were added, pH was adjusted to 3-5 with 1 mol / L hydrochloric acid, and the reaction was stirred at 40-60℃ for 2-4 h. After centrifugation, the mixture was washed with deionized water and dried to obtain modified nitrogen-doped carbon nanotubes. (3) Preparation of tungsten alloy composite material slurry: Weigh 2-6 μm tungsten powder, 2-6 μm molybdenum powder and 2-6 μm nickel powder, premix and disperse them evenly using a ball mill, add modified nitrogen-doped carbon nanotubes, graphene and polytetrafluoroethylene, mix for 1-3 h using a high-energy ball mill, add deionized water solvent, mix evenly to obtain a slurry that can be coated. (4) Clean the tungsten alloy substrate in ethanol with ultrasonic cleaning for 6-10 minutes, dry it with nitrogen, then apply the slurry to its surface with a thickness of 60-100um, remove the air bubbles in the slurry by vacuum degassing, and then cure it to obtain the cured coating material. (5) Place the cured coating material in an electric field and perform a stretching process at 300-500℃ for 20-40 minutes at a stretching rate of 1-2 mm / s. After the stretching process, cure the material and then spray a layer of polytetrafluoroethylene coating on its surface to obtain a tungsten alloy composite material with enhanced electromagnetic shielding performance.

2. The tungsten alloy composite material with enhanced electromagnetic shielding effectiveness according to claim 1 and its application in aircraft electronic equipment, characterized in that: In step (1), the ammonia flow rate is 60-100 sccm, the acetylene flow rate is 20-40 sccm, and the helium flow rate is 200-300 sccm.

3. The tungsten alloy composite material with enhanced electromagnetic shielding effectiveness according to claim 1 and its application in aircraft electronic equipment, characterized in that: In step (2), the ratio of 3-aminopropyltriethoxysilane, deionized water solvent, and nitrogen-doped carbon nanotubes is 1-2g:80-120mL:10g.

4. The tungsten alloy composite material with enhanced electromagnetic shielding effectiveness according to claim 3 and its application in aircraft electronic equipment, characterized in that: In step (3), the formulation ratio of tungsten powder, molybdenum powder, nickel powder, modified nitrogen-doped carbon nanotubes, graphene, polytetrafluoroethylene, and deionized water solvent is 100g:8-12g:8-12g:4-6g:2-3g:8-12g:8-12mL.

5. The tungsten alloy composite material with enhanced electromagnetic shielding effectiveness according to claim 1 and its application in aircraft electronic equipment, characterized in that: The curing conditions in step (4) are to place the product in an argon atmosphere and cure it at 140-180℃ for 40-60 minutes, and then allow it to cool naturally to room temperature.

6. The tungsten alloy composite material with enhanced electromagnetic shielding effectiveness according to claim 1 and its application in aircraft electronic equipment, characterized in that: The electric field strength in step (5) is 600-1000V / cm.

7. The tungsten alloy composite material with enhanced electromagnetic shielding effectiveness according to claim 1 and its application in aircraft electronic equipment, characterized in that: The curing conditions in step (5) are to place the product in an argon atmosphere and cure it at 1200-1600℃ for 2-4 hours, followed by a gradual cooling to room temperature.

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