Vacuum impregnation and hot pressing curing molding method of carbon fiber composite materials

Abstract

The invention relates to a vacuum impregnation and hot-press curing molding method for a carbon fiber composite material. The vacuum impregnation and hot-press curing molding method comprises vacuum heating and pre-dipping and hot-pressing dipping and curing forming, heating and dipping and extrusion forming of the composite material are achieved through a vacuum heating dipping device and a pressing and dipping and curing device, so that the gas impurities in the carbon fiber cloth laminated layer can be discharged in time, the defect of vacuum impregnation can be made up, so that the curingsolution can be better filled into the gap of the carbon fiber cloth, the defects of pores, shrinkage cavities and shrinkage porosity of the extruded composite material can be obviously reduced, the density is obviously improved, and then the performance of the composite material is improved. According to the vacuum impregnation and hot-press curing molding method, the composite materials with different shapes and sizes can be formed in a near-net mode according to the shape matched with the upper die and the lower die.

Description

technical field [0001] The invention relates to a step-by-step preparation device for two-dimensional braided carbon fiber composite material, and also relates to a method for preparing two-dimensional braided carbon fiber reinforced resin-based composite material by using the device. Background technique [0002] Carbon fiber composite material has excellent properties such as low density, high specific strength, high specific modulus, wear resistance, small thermal expansion coefficient and good dimensional stability. It is a lightweight, high-performance structural and functional material, used in aerospace, It has broad application prospects in the fields of weapons and equipment, communication satellites, transportation, marine engineering, construction machinery, wind power generation, and fitness equipment. Two-dimensional braided carbon fiber-reinforced resin-based composites can ensure that the performance of composite materials in the two-dimensional fiber directio...

AI Technical Summary

Problems solved by technology

This method has the advantages of simple process, flexible operation, and easy implementation, but it also has the following limitations: after mixing epoxy resin and triethylenetetramine to make a mixed solution, it is coated on both sides of the fiber and placed directly on the During the high-temperature curing process in the metal mold, it is difficult to guarantee the adequacy of the gap between the mixed solution impregnated into the carbon fiber, because there is no vacuum environment, and defects such as pores and holes are easily formed inside the composite material; high impregnation and curing pressure cannot be provided in the metal mold, The compactness of the composite material cannot be guaranteed; and there is no automatic pick-up device for the composite material, so it is difficult to pick up the piece

The mixed solution of resin and curing agent used in the preparation of carbon fiber reinforced resin matrix composites is usually lower than 200 °C, there is no melting process, and the required process parameters such as impregnation pressure and time are also significantly different from the former. The preparation devices and There are significant differences in the process

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