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A molding method of composite material with lightning protection function

A composite material and lightning protection technology, applied in the direction of coating, etc., can solve the problems of increasing the manufacturing cost of composite material structure, increasing the weight of composite material structure, and easy corrosion of metal materials, so as to avoid corrosion and weak adhesion, Meet the lightning protection requirements and reduce the effect of lightning damage

Active Publication Date: 2020-11-10
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high-density metal material not only increases the weight of the composite material structure, but also increases the manufacturing cost of the composite material structure; moreover, the metal material is prone to corrosion, and the bonding strength with the resin is low, making the bond between the composite material and the composite material difficult. The surface is prone to voids, and when the lightning current can pass through, arcs and sparks will be generated, which may even ignite the fuel tank in the structure and cause the aircraft to explode

Method used

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  • A molding method of composite material with lightning protection function

Examples

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Effect test

preparation example Construction

[0015] 1) Preparation of a resin film dispersed with conductive nano particles. Mix and disperse the nano-conductive particles and the resin containing the solvent under a high-speed mixer for 2-3 hours, then dissolve the film-forming agent in the dispersed nano-conductive particles and resin mixture, add a high-temperature curing agent and mix. Finally, the obtained resin system is poured on an iron plate at 90-120° C., and cast to form a resin film containing dispersed nano conductive particles.

[0016] 2) The fiber preform is shaped. First, the resin film and fiber cloth are cut according to the size of the mold, and then the cut fiber cloth is laid along the surface of the mold, and then the resin film is covered on it, and finally, the surrounding area of ​​the preform is sealed with a sealant.

[0017] 3) Forming the fiber preform. According to the resin film infiltration process, a microporous filter membrane is laid on the preform, a vacuum diversion system is const...

Embodiment 1

[0029] In this embodiment, taking the preparation of an aircraft cabin door as an example, multi-walled carbon nanotubes are used to improve the surface conductivity of the carbon fiber reinforced cyanate ester composite material, so as to reduce the damage caused by lightning to the aircraft cabin door.

[0030] The specific method is,

[0031] 1) Preparation of dispersed multi-walled carbon nanotube resin film. Add 0.5 parts of multi-walled carbon nanotubes modified by hexadecylamine to 300 parts of dimethyl phthalate, mix and disperse for 3 hours under a high-speed mixer, and then add 100 parts of N,N'- (4,4'-methylenediphenyl), ultrasonically dispersed at room temperature for 30 minutes and then stirred at high speed for 2 hours.

[0032] The dispersed multi-walled carbon nanotubes and resin mixture were stirred at 180° C. for 12 hours, and the solvent was removed by evaporation. Then, raise the material temperature to 135°C, add 86 parts of 2,2'-diallyl bisphenol A, sti...

Embodiment 2

[0037]In this embodiment, taking the preparation of the UAV wing as an example, nano-silver is used to improve the surface conductivity of the glass fiber reinforced epoxy resin composite material, so as to reduce the damage caused by lightning to the UAV wing.

[0038] The specific method is,

[0039] 1) Preparation of resin film dispersed with nano-silver. Add 1 part of nano-silver to 300 parts of acetone, stir at high speed, then add 100 parts of novolac epoxy resin F-51, ultrasonically disperse at room temperature for 30 minutes, and then mix and disperse under a high-speed mixer for 2 hours 1 Hour. The dispersed multi-walled carbon nanotubes and epoxy resin mixture were stirred at 90° C. for 12 hours, and the solvent was removed by evaporation. Then, raise the material temperature to 190°C, add 5 parts of film-forming agent polyethersulfone, stir to dissolve it in the resin, then lower the temperature to 120°C, add 30 parts of high-temperature curing agent diaminodiphen...

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Abstract

The invention discloses a forming method for a composite material with a lightning-protection function. The method comprises the steps that firstly a resin film provided with nano conductive particles in a dispersion mode is laid and attached to a fiber fabric preform; and secondly, the nano conductive particles are distributed in a graded mode in the thickness direction of the composite material by means of an improved resin film infiltration process, so that the conductive property of the composite material is improved, and lightning damage to the composite material is reduced. Compared with a conventional lightning-protection method for the composite material with a modified metal surface, the forming method is simple and practicable, energy consumption is reduced greatly, the manufacturing cost is lowered, the weight of a composite material component is effectively lowered, and the problems that a metal protective material is corroded and the bonding between the metal protective material and the composite material is not strong are solved.

Description

technical field [0001] The invention relates to the field of composite material lightning protection, in particular to a forming method of composite material with lightning protection function. Background technique [0002] Fiber-reinforced resin-based composite materials have the advantages of high specific strength, high corrosion resistance, and designable strength. They have been widely used in aircraft structural materials to improve aircraft weight, maneuverability, and reliability. They can also greatly increase aircraft flight time. The amount and application level have become an important symbol to measure the advanced structure of aircraft. However, compared with traditional metal materials, although the carbon fiber in the composite material has better conductivity, the insulating resin matrix blocks the conductive path, making it difficult for the lightning current to be derived on the surface of the material to generate a large amount of Joule heat. Ablation gr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C70/44B29C41/12B29C35/02B29B7/00
CPCB29B7/002B29C35/02B29C41/12B29C70/443
Inventor 段玉岗王奔辛志博
Owner XI AN JIAOTONG UNIV
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