A kind of stealth material system and its preparation method

Abstract

The invention belongs to the field of stealth technology, and discloses a stealth material system and a preparation method thereof, which includes a structural wave-absorbing material layer and a camouflage net (4) connected through a connecting part, the outer skin of the structural wave-absorbing material layer is relatively thick, It has good wave-absorbing performance in the 1-12GHz frequency band; the camouflage net has good wave-absorbing performance in the 12-40GHz frequency band, and is connected and covered on the outer surface of the structural wave-absorbing material layer. The invention solves the technical problems in the prior art that the outer skin of the structural wave-absorbing material layer is expensive and has poor mechanical properties, and the low-frequency radar stealth performance of the camouflage net is poor. Through the matching design of the structural wave-absorbing material layer and the camouflage net, on the one hand It is allowed to use thicker glass fiber reinforced composite material as the outer skin, which improves the mechanical properties of the structural absorbing material layer and reduces the cost; Excellent radar stealth performance with wide band range.

Description

technical field [0001] The invention belongs to the technical field of stealth materials, and in particular relates to a stealth material system and a preparation method thereof. Background technique [0002] The current research on stealth technology mainly includes appearance stealth, absorbing coatings, structural absorbing materials and camouflage nets and other technologies. [0003] The world's first PL-01 "stealth tank" displayed in Poland in September 2013 adopted shape stealth technology. The PL-01 stealth tank has a polyhedron shape, and even the artillery is covered with a rhombus. This is based on stealth against radar detection. shape design. The polyhedral shape makes the radar echoes concentrated in certain directions, not returning to the receiving antenna, or causing the echoes to flicker and be unstable. [0004] Wave-absorbing coatings are special coatings that are coated on the surface of a target and can absorb and attenuate incident radar waves. Abso...

AI Technical Summary

Problems solved by technology

If the skin layer is too thin, it will be difficult for the material to withstand the impact load of the collision, resulting in damage

[0006] Chinese patent CN200910044770.5 (application number) discloses a light-weight broadband foam sandwich structure wave-absorbing material and its preparation method. The material is composed of a wave-transmitting material layer panel, a wave-absorbing resin foam sandwich and an electromagnetic wave absorbing reflection layer bottom plate. The panel is made of 2mm thick glass fiber reinforced composite material, and the bottom plate is made of 3mm thick magnetic carbon fiber composite material. With the difference of the sandwich material, the performance of the absorbing material is also different. It has strong absorption in a wide frequency range and is light in weight and thin in thickness. The goal of material design; as the thickness and composition of the sandwich change, the corresponding frequency and width of the absorption peak will change, but it is difficult to achieve strong absorption at the same time in the low frequency band and high frequency band, such as the one with the widest absorption band in CN200910044770.5 Embodiment 7 achieves a reflectivity of less than -10dB in the range of 5GHz~17GHz. According to the standard of -10dB, only the X-band (8GHz~12GHz) commonly used by radar is completely covered, and the C-band (4GHz~8GHz) and Ku-band are partially covered. (12GHz~18GHz); unable to cover L-band (1GHz~2GHz), S-band (2GHz~4GHz), Ka-band (26.5GHz~40GHz) commonly used by radar

[0007] Chinese patent CN106739321A (application number 201611080943.5) discloses a multi-layer composite absorbing material and its preparation method, which is composed of a wave-transmitting layer, an impedance matching layer, a reflecting layer and at least one absorbing layer, wherein the absorbing layer absorbs The weight percentage of the absorbent is 65% to 85%. The absorbent includes one or more of carbonyl iron powder, ferrite powder, iron silicon chromium or iron silicon aluminum alloy powder. The use of a large amount of iron absorbent Unable to avoid the problem of heavy weight

CN106739321A also does not involve the wave-absorbing performance of the Ka band (26.5GHz~40GHz)

Since the radar operating wavelength ranges from about 30cm in the L-band to about 8mm in the Ka-band, the traditional camouflage net cannot meet the performance requirements in the full wavelength range

Traditional camouflage nets mainly rely on scattering radar waves to reduce the energy returned to the receiving antenna to resist radar detection, and the effective frequency band is limited

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