Elevator degree distribution silicon carbide fiber reinforced ceramic-based ultra-wideband wave-absorbing composite material and preparation method thereof

Abstract

The invention relates to the field of high-temperature-resistant wave-absorbing materials, and particularly discloses an elevator degree distribution silicon carbide fiber reinforced ceramic-based ultra-wideband wave-absorbing composite material. The composite material, starting from the incident direction of the electromagnetic wave, sequentially comprises a first high-resistance silicon carbide fiber reinforced ceramic matrix composite material layer, a first lossy silicon carbide fiber array reinforced ceramic matrix composite material layer, a second high-resistance silicon carbide fiber reinforced ceramic matrix composite material layer, a second lossy silicon carbide fiber array reinforced ceramic matrix composite material layer, a third high-resistance silicon carbide fiber reinforced ceramic matrix composite material layer, a third lossy silicon carbide fiber array reinforced ceramic matrix composite material layer and a fourth high-resistance silicon carbide fiber reinforced ceramic matrix composite material layer; and the lossy silicon carbide fiber array is composed of two-dimensional fiber cloth patch units arranged in a periodic array mode, the periodic units are the same in size, the patch sizes are sequentially increased, and the sheet resistance is sequentially reduced. The wave-absorbing bandwidth of the wave-absorbing composite material is remarkably improved, the wave band of 340 GHz can be covered, and the wave-absorbing performance is excellent.

Description

technical field [0001] The invention belongs to the field of high-temperature-resistant wave-absorbing materials, in particular to an electric gradient distribution silicon carbide fiber-reinforced ceramic-based ultra-broadband wave-absorbing composite material and a preparation method thereof. Background technique [0002] Silicon carbide fiber-reinforced ceramic matrix composites have the advantages of high temperature resistance, high specific strength, high specific modulus, high toughness, and easy forming of large and complex components. At the same time, silicon carbide materials have semiconductor properties, and can be controlled by raw material composition and preparation process. So that it has different composition and structure, the above characteristics make silicon carbide fiber reinforced ceramic matrix composites have a wider range of dielectric constant regulation, and it is easier to achieve better microwave absorption performance, making silicon carbide fi...

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Problems solved by technology

Chinese patent No. ZL201610592040.9 discloses a metamaterial-based silicon carbide composite wave-absorbing ceramic and its preparation method. The metamaterial resistance coating is used to realize the wave-absorbing function, so that the wave-absorbing performance can be extended to lower frequency bands. 8~18GHz, 4~8GHz or 2~6GHz) have a good absorbing effect, but there are still some shortcomings: the absorbing frequency band is narrow, and the high-frequency absorbing performance is not obvious; metamaterials are realized by coating, If the metamaterial layer is inserted into the material, multiple moldings are required, the process is complicated, and the interlayer performance is not high due to multiple moldings; the metamaterial layer and the silicon carbide fiber reinforced ceramic matrix composite material are made of different materials, which will cause interlayer Poor performance and overall performance

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