Carbon fiber composite material heating and curing process

Abstract

The invention relates to a carbon fiber composite material heating and curing process, and belongs to the technical field of carbon fiber composite material forming processes. The carbon fiber composite material heating and curing process comprises the following steps: (1) vacuumizing: a carbon fiber composite material is put in a curing device for vacuumizing to reach a vacuum degree of below -0.8 bar and keeping by 2-10 min; (2) pressurization and heating: the environmental temperature in the curing device rises to 120-170 DEG C at a speed of 1.0-2.0 DEGC / min; and meanwhile, the pressure rises to 1.0-2.0 bar; (3) insulation and pressurization: under the pressure condition in the step (2), the pressure continuously rises to 3.0-4.0 bar, and is kept by 100-150 min; and (4) cooling and pressure reduction: the environmental temperature is slowly reduced according to the temperature gradient of 8-12 DEG C; each temperature gradient is kept by 5-15 min; and when the environmental temperature is lower than 80 DEG C, the pressure is slowly reduced. The carbon fiber composite material, obtained by the technical scheme, is higher in product pass percent compared with a traditional process; the production cost is effectively controlled; and the beneficial effects are prominent.

Description

technical field [0001] The invention relates to a carbon fiber composite material heating and curing process, which belongs to the technical field of carbon fiber composite material forming technology. Background technique [0002] As an advanced composite material, carbon fiber composite material has a series of advantages such as light weight, high modulus, high specific strength, low thermal expansion coefficient, high temperature resistance, thermal shock resistance, corrosion resistance, and good vibration absorption. , strategic weapons (missiles, etc.) and other fields have been widely used. For example, if it is used in aerospace structures, it can reduce the weight by 20% to 30% compared with conventional metal structures, and can significantly improve its aeroelastic properties. It can effectively improve flight performance when used in the aerospace field, which is impossible or difficult to achieve with other materials. In the civilian field, the weight of carbo...

AI Technical Summary

Problems solved by technology

On the other hand, the quality and production capacity of domestic carbon fiber are far from meeting the market demand, especially the high-quality carbon fiber composite materials in the civilian field, it is difficult to reach the world standard. Therefore, it is important to provide a stable carbon fiber production process. significance

[0004] In the production process of carbon fiber composite materials, due to the complex heat exchange and chemical reactions in the heating and curing process of composite materials, theoretically a temperature gradient will be generated inside the composite material, especially when the volume of the composite material is large, the difference in temperature gradient If it is too large, the internal residual stress of the composite material component will be too large, resulting in the deformation of the component

Usually, in the heating and curing process, it is necessary to cover the carbon fiber composite with auxiliary materials such as vacuum bags and air felts. These auxiliary materials play a role of heat insulation and have a complete temperature distribution on the surface near the mold and the surface near the vacuum bag. It is not the same, which also causes the temperature field in the hot pressing device to be more complicated, which also puts forward higher requirements for the all-round monitoring of the temperature in the hot pressing device during the heating and curing process