Method for performing composite heating on wave absorbing materials

Abstract

The invention provides a method for performing composite heating on wave absorbing materials. The method is completed in a composite heating device consisting of a hot-press pot, a microwave cavity arranged in the hot-press pot, and a microwave generator emitting microwaves into the microwave cavity, wherein the microwave cavity comprises a porous wall plate, and the porous wall plate is used for controlling the microwaves generated by the microwave generator within the microwave cavity and besides not preventing exchange of internal gas and external gas of the microwave cavity; the wave absorbing materials are arranged in the microwave cavity; and before a wave absorbing material component is heated, an intense wave absorbing material layer is arranged on partial area of the outer surface of the wave absorbing material component. The heating method comprises the following steps of performing heating by the hot-press pot to raise the internal temperature of the wave absorbing material component to medium temperature; then, stopping heating the wave absorbing material component by the hot-press pot or setting the temperature control of the hot-press pot as a heat preserving state; and starting the microwave generator to raise the internal temperature of the wave absorbing material component to target temperature. Through the adoption of the method disclosed by the invention, the condition that a whole temperature field is uniform during the molding of a molded piece is guaranteed, so that molding precision is high, and properties are good.

Description

technical field [0001] The invention belongs to the field of composite material manufacturing, in particular to a composite heating method for wave-absorbing materials. Background technique [0002] The curing process of composite materials, such as those containing carbon fiber fabrics and resins, is a complex process of rapid changes in thermal, chemical and mechanical properties. Especially for large-sized parts, due to the complexity of its structure, such as variable thickness, multi-interface, variable structure (C-type, I-type, J-type, T-type), and the inhomogeneity of the manufacturing process environment, the part is curing It is difficult to maintain consistent temperature and pressure distribution at different parts during the process, which leads to uneven resin flow and asynchronous curing effect, which is prone to defects such as delamination, pores and fiber macroscopic slippage, and reduces the performance of the part; at the same time, due to The anisotropy...

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Problems solved by technology

[0011] The purpose of the present invention is to provide a method for composite heating of wave-absorbing materials, so as to solve the problems of easy temperature overshoot when wave-absorbing materials are molded, solidified and heated, large difference between surface temperature T3 and internal temperature T4 of wave-absorbing material components, and temperature Technical issues with uneven distribution

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