A kind of electric gradient distribution silicon carbide fiber reinforced ceramic matrix ultra-broadband wave-absorbing composite material and its preparation method

Abstract

The invention relates to the field of high-temperature-resistant wave-absorbing materials, and specifically discloses a silicon carbide fiber-reinforced ceramic-based ultra-broadband wave-absorbing composite material with an electric gradient distribution. Starting from the incident direction of electromagnetic waves, the first high-resistance silicon carbide fiber-reinforced ceramic-based composite material is sequentially included. Material layer, the first lossy silicon carbide fiber array reinforced ceramic matrix composite material layer, the second high resistance silicon carbide fiber reinforced ceramic matrix composite material layer, the second lossy silicon carbide fiber array reinforced ceramic matrix composite material layer, the third high The resistance silicon carbide fiber reinforced ceramic matrix composite material layer, the third lossy silicon carbide fiber array reinforced ceramic matrix composite material layer, the fourth high resistance silicon carbide fiber reinforced ceramic matrix composite material layer; the lossy silicon carbide fiber array is periodic Composed of two-dimensional fiber cloth patch units arranged in an array, the size of the periodic unit is the same, the size of the patch increases sequentially, and the square resistance decreases sequentially. The wave-absorbing composite material of the present invention has significantly improved wave-absorbing bandwidth, can cover the 3-40 GHz band, and has excellent wave-absorbing performance.

Description

technical field [0001] The invention belongs to the field of high-temperature-resistant wave-absorbing materials, in particular to a silicon carbide fiber-reinforced ceramic-based ultra-broadband wave-absorbing composite material with an elevator gradient distribution 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 to form large and complex components. At the same time, silicon carbide materials have semiconductor properties, and can be controlled by the composition of raw materials and the preparation process. It has different compositions and structures. The above characteristics make silicon carbide fiber reinforced ceramic matrix composites have a wider range of dielectric constant control, and it is easier to achieve better wave absorbing properties, which promotes silicon ca...

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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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