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Efficient Microwave Curing Method for Impedance Matched Carbon Fiber Composites

A technology of impedance matching and composite materials, which is applied in household appliances, other household appliances, household components, etc., can solve the problems of impedance mismatch and high microwave reflectivity, and achieve the effect of improving microwave curing efficiency

Active Publication Date: 2020-07-03
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the impedance at the interface between the air and the composite material is seriously mismatched when the microwave is heated and cured, and the microwave reflectivity is high, so that the microwave cannot reach the interior of the composite material for effective heating and curing, and to invent a carbon fiber with impedance matching High-efficiency microwave curing method for composite materials, realizing efficient direct microwave heating and curing of carbon fiber composite materials

Method used

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  • Efficient Microwave Curing Method for Impedance Matched Carbon Fiber Composites

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Effect test

Embodiment 1

[0020] like figure 1 shown.

[0021] The carbon fiber composite material 8 of this embodiment adopts 20 layers of continuous carbon fiber reinforced bismaleimide resin-based composite material, and the layering sequence is [0 / 45 / -45 / 90] 5 , the size of the parts is 300mm × 300mm × 2.5mm. After the lamination is completed, paste aluminum foil tape around the carbon fiber composite material 8, and reserve the flow glue hole. Impedance matching layers 1, 2, 3, 4, 5 are made of high temperature resistant epoxy resin and nano iron powder (diameter 400μm) composite cured, a total of 5 different impedance matching layers (1, 2, 3, 4, 5) are used. ), and the relevant parameters are as follows. The first layer: the mass fraction of nano iron powder is 15.6%, the thickness is 1.02mm; the second layer: the mass fraction of nano iron powder is 21.4%, the thickness is 2.54mm; the third layer: the mass fraction of nano iron powder is 29.3%, the thickness is 4.96mm ;The fourth layer: the...

Embodiment 2

[0023] The difference between this embodiment and Embodiment 1 is that the microwave sensitive material adopts graphene, the mass fraction of graphene in the first impedance matching layer is 0.5%, and the thickness is 0.10 mm; the second layer: the mass fraction of graphene is 2%, and the thickness is 0.55 mm. mm; the third layer: the mass fraction of graphene is 4.5%, the thickness is 1.08mm; the fourth layer: the mass fraction of graphene is 6.3%, the thickness is 1.38mm; the fifth layer: the mass fraction of graphene is 8.2%, the thickness is 0.98mm; The rest are the same as the first embodiment.

Embodiment 3

[0025] The difference between this embodiment and the first embodiment is that the microwave sensitive filling material is carbon black, the mass fraction of carbon black in the first impedance matching layer is 5.8%, and the thickness is 1.02 mm; the second layer: the mass fraction of carbon black is 8.4%, and the thickness is 1.02 mm. 1.55mm; the third layer: the mass fraction of carbon black is 11.5%, the thickness is 1.08mm; the fourth layer: the mass fraction of carbon black is 14.1%, the thickness is 1.25mm; the fifth layer: the mass fraction of carbon black is 18.5%, the thickness is 1.96mm ; The rest are the same as the first embodiment.

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Abstract

The invention discloses an efficient microwave curing method for an impedance-matched carbon fiber composite material. The efficient microwave curing method is characterized in that a series of impedance-matched layers with gradient-change microwave impedance are placed on the surface of a carbon fiber composite material component, so that a great number of microwaves penetrate through the composite material for performing efficient and direct microwave heating and curing on the composite material. Furthermore, the invention discloses a design and manufacturing method for an impedance-matchedlayer, and the design and manufacturing method radically breaks through the problem that microwaves cannot penetrate through the carbon fiber composite material for effectively heating and curing as impedance is not matched, greatly improves microwave curing efficiency of the carbon fiber composite material, and provides theoretical basis and technical support for industrial application of a composite material microwave curing technology.

Description

technical field [0001] The invention relates to a high-efficiency curing method for composite materials, in particular to a high-efficiency microwave curing method for composite materials, in particular to an impedance-matching high-efficiency microwave curing method for carbon fiber composite materials. Background technique [0002] Advanced composite materials have many excellent properties, such as high specific strength and specific modulus, good fatigue resistance, good corrosion resistance and good overall formability. It can also greatly reduce the number of parts, simplify the assembly process, and shorten the manufacturing cycle. At present, composite materials have been widely used in the main load-bearing parts of wings and fuselage, and are used more and more in complex curved parts such as air intakes, and are developing towards integral molding and co-curing. [0003] At present, composite materials are mainly formed by heating and pressure curing in the autoc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C35/08B29L31/30
CPCB29C35/0805B29C2035/0855B29L2031/3076B29L2031/3082B29L2031/3085
Inventor 李迎光周靖
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS