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Interlayer performance enhanced carbon fiber composite material based on dielectrophoresis and preparation method thereof

A composite material and interlayer performance technology, which is applied in the field of carbon fiber composite materials, can solve the problems of deteriorating composite interlayer mechanical strength, enhancing electrical conductivity/strength, etc., to optimize lightning strike resistance, improve impact strength, and enhance mechanical strength. Effect

Active Publication Date: 2022-03-25
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, the commonly used method to improve the conductivity of the resin matrix is ​​to add conductive fillers, such as metals, carbon nanotubes, etc. The degree of performance optimization has a positive correlation with the content of fillers, and too high a filler content will still deteriorate the mechanical strength of the composite layer. , so there is also a contradiction in enhancing the conductivity / strength

Method used

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  • Interlayer performance enhanced carbon fiber composite material based on dielectrophoresis and preparation method thereof
  • Interlayer performance enhanced carbon fiber composite material based on dielectrophoresis and preparation method thereof
  • Interlayer performance enhanced carbon fiber composite material based on dielectrophoresis and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Disperse metal copper particles in the E51 epoxy resin matrix with a dispersion concentration of 20mg / ml, ultrasonically treat with ultrasonic equipment at 19.75KHz for 30 minutes, then use a magnetic stirrer at a speed of 400rpm, and stir at a heating temperature of 60°C for 1 Hours, to ensure that the particles will not agglomerate or settle.

[0034] 2) After the mixed dispersion liquid in step 1) is cooled, the air bubbles of the resin are extracted with a vacuum pump, and the carbon fiber composite material is prepared using the resin. When carbon fiber is placed, an AC electric field is applied between the carbon fiber layers, and pin-plate copper electrodes with a slightly wider spacing than the layers are vertically arranged on both sides of the resin.

[0035] 3) The voltage is 50V, the frequency is 50Hz, and a protection resistor of 10kΩ is connected in series in the circuit. The dielectrophoretic assembly of the metal particles was started after the elect...

Embodiment 2

[0038] 1) Disperse the metal copper particles in the E51 epoxy resin matrix, the dispersion concentration is 50mg / ml, use an ultrasonic device to sonicate at 19.75KHz for 30 minutes, and then use a magnetic stirrer at a speed of 400rpm, and stir at a heating temperature of 60°C for 1.5 Hours, to ensure that the particles will not agglomerate or settle.

[0039] 2) After the mixed dispersion liquid in step 1) is cooled, the air bubbles of the resin are extracted with a vacuum pump, and the carbon fiber composite material is prepared using the resin. When carbon fiber is placed, an AC electric field is applied between the carbon fiber layers, and pin-plate copper electrodes with a slightly wider spacing than the layers are vertically arranged on both sides of the resin.

[0040] 3) The voltage is 50V, the frequency is 50Hz, and a protection resistor of 10kΩ is connected in series in the circuit. The dielectrophoretic assembly of the metal particles was started after the electri...

Embodiment 3

[0043] 1) Disperse the metal copper particles in the E51 epoxy resin matrix, the dispersion concentration is 80mg / ml, and use an ultrasonic device to sonicate at 19.75KHz for 45 minutes, then use a magnetic stirrer at a speed of 420rpm, and stir at a heating temperature of 80°C for 1.5 Hours, to ensure that the particles will not agglomerate or settle.

[0044]2) After the mixed dispersion liquid in step 1) is cooled, the air bubbles of the resin are extracted with a vacuum pump, and the carbon fiber composite material is prepared using the resin. When carbon fiber is placed, an AC electric field is applied between the carbon fiber layers, and pin-plate copper electrodes with a slightly wider spacing than the layers are vertically arranged on both sides of the resin.

[0045] 3) The voltage is 40V, the frequency is 60Hz, and a protection resistor of 10kΩ is connected in series in the circuit. The dielectrophoretic assembly of the metal particles was started after the electric...

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Abstract

The invention discloses a carbon fiber composite material with enhanced interlayer performance based on dielectrophoresis and a preparation method thereof. The preparation method comprises the following steps: 1) dispersing metal particles in a resin matrix to form a dispersion liquid; 2) defoaming the dispersion liquid, placing the dispersion liquid between carbon fiber layers, and arranging electrodes between the carbon fiber layers; (3) alternating current is introduced into the electrodes, an electric field is applied, and the metal particles are assembled into a particle chain between the electrodes; moving the electrode to assemble metal particle chains at a plurality of positions; and 4) removing the upper and lower electrode plates, and performing hot-pressing curing to obtain the carbon fiber composite product. The metal particle chain can serve as a force bearing structure to avoid cracks, the interlayer conductivity of the carbon fibers can be enhanced, and dispersed particles can toughen the resin and hinder crack propagation. According to the method, an electric field is applied to metal particles, a directionally-arranged micro-nano composite structure is manufactured, and the interlayer performance of the carbon fiber composite material is improved by combining'introduction of a force bearing structure 'and'matrix modification'.

Description

technical field [0001] The invention relates to the field of micro-nano manufacturing of composite materials, in particular to a carbon fiber composite material with enhanced interlayer performance using dielectrophoresis technology and a method thereof. Background technique [0002] In recent years, carbon fiber composite materials have developed rapidly because of their excellent performance, especially in the field of aerospace and gradually replacing metal structural materials. Carbon fiber resin-based composite materials have high specific strength, high specific modulus, fatigue resistance, corrosion resistance, and excellent structural integration. poor. In a complex working environment, the internal temperature and stress change suddenly, and the carbon fiber composite laminates are prone to cracks between different layers and spread along the layers to form delamination, resulting in weak impact resistance and fracture toughness of the material. affect the overall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/04C08L63/02C08K7/06
CPCC08J5/042C08J2363/02
Inventor 朱逸颖罗威肖晓晖宋梓贤
Owner WUHAN UNIV
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