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Non-autoclave electroforming composite material method based on carbon nanomaterial

A technology of carbon nanomaterials and composite materials, which is applied in the field of composite material structure molding, can solve problems such as unspecified thickness and resin film adhesion of complex special-shaped parts, so as to improve the uniformity of temperature field and improve the quality and efficiency of molding , Improve the effect of temperature conduction

Inactive Publication Date: 2021-11-26
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] To address these problems, the patent CN109367060A discloses a microwave curing method, which reduces defects and provides heat for vacuum bag forming composite materials based on a vibration table and a microwave generator, but the shape of the cavity still needs to be fixed before being placed into the product ; Patent CN112743921A is based on the laying sequence of resin films with gradient viscosity between layers, heating the resin film to melt and reduce defects, but it does not explain the adhesion of the resin film for complex special-shaped parts and the thickness of the resin between layers

Method used

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  • Non-autoclave electroforming composite material method based on carbon nanomaterial

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Embodiment 1

[0049] Embodiments of the present invention relate to a non-autoclave electroforming composite method based on carbon nanomaterials, such as figure 1 As shown, it includes a vacuum bag 1, an air felt 2, a thermocouple and its host 3, a non-porous Teflon film 4, a high voltage generator 5, a thin layer of highly oriented multi-walled carbon nanotubes with a diameter of 5-10 nm and a thickness of 20 μm 6 , Hexcel AS4 / 8552 aviation-grade carbon fiber unidirectional tape prepreg 7, sheet resistance ~ 5Ω / port, thickness 40μm carbon nanotube resistance heater 8, vacuum valve 9, sealing putty 10, bottom plate 11, heat insulation layer 12.

[0050] Using the device and method of the present invention to solidify a Hexcel AS4 / 8552 carbon fiber unidirectional tape prepreg commonly used on the rear fuselage skin of an aviation civil aircraft, the steps are as follows.

[0051] S1. Lay non-porous Teflon film 4, carbon nanotube resistance heater 8, and non-porous Teflon film 4 on the bott...

Embodiment 2

[0068] Embodiments of the present invention relate to a non-autoclave electroforming composite method based on carbon nanomaterials, such as figure 1 As shown, it includes vacuum bag 1, air felt 2, thermocouple and its host 3, non-porous Teflon film 4, high voltage generator 5, continuous carbon nanofiber film 6 with a diameter of 300nm and a thickness of 22μm, Lily Aerospace T300 / Epoxy resin carbon fiber unidirectional tape prepreg 7, sheet resistance ~ 5Ω / port, 40 μm thick carbon nanotube resistance heater 8, vacuum valve 9, sealing putty 10, bottom plate 11, heat insulation layer 12.

[0069] Use the device and method of the present invention to cure a commonly used Lily Aerospace T300 / epoxy resin carbon fiber unidirectional tape prepreg, and compare its interlaminar mode II fracture toughness G ⅡC performance, the steps are as follows.

[0070] S1. Lay non-porous Teflon film 4, carbon nanotube resistance heater 8, and non-porous Teflon film 4 on the bottom plate 11 in o...

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Abstract

The invention provides a non-autoclave electroforming composite material method based on a carbon nanomaterial, which comprises the following steps: laying a carbon nano ultrathin film interlayer between prepregs or dry cloth in a designed product structure, providing interlayer capillary pressure, toughening the structure, and improving the temperature uniformity in the thickness direction. Carbon nano-films wrapped by non-porous Teflon films are arranged on the outer side and the inner side of the structure respectively and serve as resistance heaters, the two ends of the resistance heaters and copper sheets are bonded to be connected into a high-voltage generator, thermocouples are arranged at all positions of the carbon nano-films according to the designed product structure, and real-time temperature monitoring is carried out. The non-porous Teflon films mainly play a role in demolding and insulation. And finally, vacuum bag packaging and heat insulation material wrapping are performed to avoid heat loss, so that electric energy consumption is greatly reduced. And voltage is started after vacuumizing, heating curing is carried out, and in the curing process, the curing temperature change process can be controlled by monitoring the real-time temperature of the thermocouples and adjusting the magnitude of the voltage.

Description

technical field [0001] The invention relates to the technical field of composite material structure molding, in particular to a non-autoclave electroforming composite material method based on carbon nanomaterials. Background technique [0002] At present, in terms of high-performance fiber-reinforced resin-based composite molding technology, the autoclave process can effectively eliminate defects such as air bubbles and cavities caused by the flow of the matrix, improve the fiber content, and is suitable for the molding of various complex structures, such as T800 carbon fiber reinforced double horse The lymide resin prepreg needs to be cured and molded in an autoclave at 210°C and 1.2MPa under warm pressure, which effectively avoids the formation of defects caused by air trapped in the viscous Shuangma resin, which affects the stiffness and strength. [0003] However, it has to be admitted that the molded parts of this process are often limited by the volume and pressure bea...

Claims

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Application Information

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IPC IPC(8): B29C70/44B29C70/54B29C35/02
CPCB29C70/44B29C70/54B29C35/06B29C2035/0211
Inventor 何霁江晟达
Owner SHANGHAI JIAO TONG UNIV
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