A kind of ablation type anti-heat-insulation and wave-absorbing integrated composite material and preparation method thereof

Abstract

The invention relates to the technical field of wave-absorbing composite materials, and specifically discloses an ablation-type heat-insulating and wave-absorbing integrated composite material and a preparation method thereof. Starting from the incident direction of electromagnetic waves, it sequentially includes a first continuous fiber-reinforced composite material medium layer, The first lossy silicon carbide fiber array reinforced composite material layer, the second continuous fiber reinforced composite material medium layer, the second lossy silicon carbide fiber array reinforced composite material layer, the third continuous fiber reinforced composite material medium layer; the first, the second The second lossy silicon carbide fiber array is composed of two-dimensional fiber cloth patch units arranged in a periodic array, and the first and second lossy silicon carbide fiber array periodic units have the same size, and the size of the patch increases sequentially; integration The matrix of the composite material is a mixed system of silicone resin, phenolic resin and hollow glass microspheres. The composite material of the invention has low density, high temperature resistance, excellent heat insulation and wave absorption performance.

Description

technical field [0001] The invention belongs to the technical field of wave-absorbing composite materials, and particularly relates to an ablation-type integrated composite material of anti-heat-insulation and wave-absorbing and a preparation method thereof. Background technique [0002] The thermal protection system has the functions of ensuring the integrity of the structure of the aircraft under the condition of high-speed airflow scouring, and playing a role of heat insulation to protect the internal equipment of the aircraft. It is an indispensable part of the aircraft. The ablative thermal protection system is currently the main thermal protection method for aircraft. It has the advantages of safe and reliable operation, high thermal protection efficiency, strong adaptability to flow field changes, and low cost. High temperature resistance, low thermal conductivity, low ablation and other characteristics. In addition, the thermal protection system has the characterist...

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Problems solved by technology

The resin system of the existing mature thermal protection system is mainly phenolic resin, but the phenolic resin has a serious carbonization problem after ablation, and the carbon produced will seriously reflect electromagnetic waves, resulting in the phenolic system thermal protection material being unable to have the stealth function

[0003] Therefore, to make the existing ablation-type anti-insulation materials have the stealth function, it is first necessary to optimize the resin system of the material and solve the problem of carbonization of the phenolic resin; The addition of absorbent has the following problems: 1) In order to achieve the function of absorbing waves, the amount of absorbent added is relatively large, and the introduction of a large amount of absorbent will significantly affect the mechanical and thermal insulation properties of the material; 2) The addition of absorbent will significantly affect the performance of the resin. Rheology, resulting in poor processability of materials; 3) Traditional absorbers are limited by the dispersion characteristics of electromagnetic parameters, making it difficult to achieve broadband absorbing functions, and the gradient distribution scheme of multi-layer electrical properties is difficult to achieve in the composite material forming process

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