Molding method of pulse current curing carbon fiber composite material

A composite material and molding method technology, applied in the direction of weight reduction, etc., can solve the problems of carbon fiber perforation, affecting the overall mechanical properties of carbon fiber composite components, and excessive current, and achieve the effect of short curing cycle, high curing efficiency and fast heating

Pending Publication Date: 2022-06-03
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high electrical conductivity of carbon fiber makes the current required when the material reaches the curing temperature too large. For example, the current required to heat a carbon fiber composite material with a length of 80 mm, a width of 50 mm, and a thickness of 1 mm to 13...

Method used

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  • Molding method of pulse current curing carbon fiber composite material
  • Molding method of pulse current curing carbon fiber composite material
  • Molding method of pulse current curing carbon fiber composite material

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

Specific implementation one:

[0072] The carbon fiber prepreg used in this example is a unidirectional T700 carbon fiber / epoxy resin prepreg. The material size is 240mm long*100mm*0.125mm*8 layers, and the volume fraction of carbon fiber is 0.65. The curing temperature process of the composite material It is required to keep at 80℃ for 40min and at 130℃ for 40min.

[0073] The rigid mold selected is a 1060 aluminum plate with a length of 300mm, a width of 200mm and a thickness of 2mm. The insulating film is a Teflon film with a length of 260mm, a width of 150mm and a thickness of 1mm. The heat resistance limit is 260°C. It is a high-strength polyester fiber cloth with a length of 250mm, a width of 150mm and a thickness of 1mm, with a heat resistance limit of 150℃. 10mm thick, 3mm long and 120mm long copper strip, the wire adopts national standard soft wire copper wire, and the cross-sectional area is 70mm 2 .

[0074] Specific steps are as follows:

[0075] Step 1: Materia...

specific Embodiment approach 2

[0088] The high-frequency pulse power supply described in this embodiment can provide 0-10000A pulse current, the output frequency is adjustable from 0-200KHz, the output duty cycle is adjustable from 0-100%, and the pulse form is adjustable in one-way pulse or two-way pulse.

Specific implementation two:

[0090] The carbon fiber prepreg 5 used in this example is a bidirectional T300 carbon fiber / epoxy resin prepreg. The material size is 200mm long*150mm*0.25mm*8 layers, and the carbon fiber volume fraction is 0.68. The carbon fiber prepreg 5 has a The curing temperature process requires holding at 180°C for 150min. The rigid mold selected is tempered glass with a length of 400mm, width of 300mm and a thickness of 5mm. Because the surface of the tempered glass is insulated, no insulating cloth is required. The air felt is a non-woven fabric of high temperature resistant polyester fiber material with a length of 250mm, a width of 200mm and a thickness of 1mm. The heat resista...

specific Embodiment approach 3

[0104] The temperature probe described in this embodiment is an infrared imaging thermometer, and the temperature measurement range is 0-400°C. The temperature distribution of the carbon fiber prepreg can be observed in the global range at the height placed.

[0105] The high-frequency pulse power supply described in this embodiment can provide 0-10000A pulse current, the output frequency is adjustable from 0-300KHz, the output duty cycle is adjustable from 0-100%, and the pulse form is adjustable in one-way pulse or two-way pulse.

Specific implementation three:

[0107] The carbon fiber prepreg used in this example is a unidirectional T300 carbon fiber / polypropylene prepreg, and the material size is 350mm long*300mm*0.25mm*8 layers, wherein the carbon fiber volume fraction is 0.60, and the curing temperature of the carbon fiber prepreg The process requires holding at 150°C for 30min. The rigid mold selected is a quartz plate with a length of 400mm, a width of 400mm and a th...

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Abstract

According to the forming method for curing the carbon fiber composite material through the pulse current, metal materials with good conductivity are arranged at the two ends, in the fiber length direction, of the carbon fiber composite material correspondingly to serve as electrodes, a pulse power source is connected with the electrodes through wires, and the pulse current with the controllable frequency and peak value is provided; joule heat is generated in the carbon fibers under the thermal effect of current, temperature control is performed by adjusting the magnitude of average current, and meanwhile, the skin depth of the skin effect is changed by adjusting the frequency of pulse current, so that the effective resistance of the carbon fibers is changed, and the temperature of the material is cooperatively controlled; and under the auxiliary condition that uniform pressure is applied to the carbon fiber composite material, curing molding of the carbon fiber composite material is carried out according to the curing temperature requirement of the composite material.

Description

technical field [0001] The application relates to the field of curing and molding of carbon fiber composite materials, and in particular to a molding method of pulse current curing carbon fiber composite materials. Background technique [0002] Compared with metal materials or other engineering materials, carbon fiber composites have higher specific strength, specific modulus, good fatigue resistance and corrosion resistance, and most carbon fiber composites can be designed by designing the orientation and amount of reinforcing fibers. The performance of structural materials is tailored to optimize performance. As an important part of aerospace high-tech products, carbon fiber composite materials can effectively reduce the structural mass of aircraft, increase payload and range, and reduce costs. Aircraft such as the Boeing 787 (Boeing) and Airbus A350 (Airbus) have replaced more than 50 percent of the fuselage with carbon fiber composites. As the excellent properties of c...

Claims

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Application Information

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IPC IPC(8): B29C70/34
CPCB29C70/342Y02T50/40
Inventor 陈刚张鸿名王博陈震李鑫常旭升
Owner HARBIN INST OF TECH AT WEIHAI
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