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High-temperature-resistant broadband wave-absorbing structure composite material and preparation method thereof

A composite material and high-temperature-resistant technology, which is applied in the field of microwave-absorbing materials, can solve problems such as structural strength to be improved, broadband microwave absorption cannot be guaranteed, and overall performance is poor, so as to achieve high repeatability and operability, improve application value, and overall sex-enhancing effect

Pending Publication Date: 2022-06-14
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] At present, the structure of absorbing materials is mostly layered composite or multi-layer metamaterial composite, the overall performance of the material is poor, the structural strength needs to be improved, and the performance is relatively simple. High temperature and weather resistance requirements, and simple layered resin-based composites or metamaterials cannot guarantee broadband microwave absorption while achieving good structural strength and high temperature resistance

Method used

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  • High-temperature-resistant broadband wave-absorbing structure composite material and preparation method thereof
  • High-temperature-resistant broadband wave-absorbing structure composite material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0024] A high-temperature-resistant broadband wave-absorbing structure composite material is composed of a composite material medium layer and a periodic structure layer which are sequentially compounded from outside to inside. The composite material medium layer is a fiber preform reinforced ceramic matrix composite material, from outside to inside. It is followed by a wave-transmitting layer and a loss layer, and the periodic structure layer is a metal composite material.

[0025] Further, the periodic structure layer is prepared on the lower surface of the composite material by etching and electroplating. Double effect of absorbing reflection, thickness 0.5mm, see figure 1 .

[0026] Further, the medium layer is a three-dimensional fabric reinforced ceramic matrix composite material, the wave-transmitting layer is quartz fiber, the loss layer is silicon carbide fiber, and the above-mentioned fibers of each layer form a three-dimensional overall structure by means of angula...

Embodiment 2

[0036]A high-temperature-resistant broadband wave-absorbing structure composite material is composed of a composite material medium layer and a periodic structure layer which are sequentially compounded from outside to inside. The composite material medium layer is a fiber preform reinforced ceramic matrix composite material, from outside to inside. It is followed by a wave-transmitting layer and a loss layer, and the periodic structure layer is a metal composite material.

[0037] Further, the periodic structure layer is prepared on the lower surface of the composite material by etching and electroplating, and the pattern type is a cross with a side number of 12, and the material used is metal nickel, which forms a wave absorption with the electroplated metal layer. Double effect of reflection, thickness 0.5mm, see figure 2 ;

[0038] Further, the medium layer is a three-dimensional fabric reinforced ceramic matrix composite material, the wave-transmitting layer is alumina ...

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Abstract

The invention discloses a high-temperature-resistant broadband wave-absorbing structure composite material which comprises a composite material dielectric layer and a periodic structure layer, the composite material dielectric layer is composed of a mixed fiber preform reinforced ceramic matrix composite material and comprises a wave-transparent layer and a loss layer from outside to inside, and the periodic structure layer is made of a metal composite material. The preparation method of the composite material comprises the following steps: preparation of a fiber preform, preparation of an interface, preparation of a matrix and preparation of the periodic structure layer. The obtained composite material effectively achieves broadband absorption of electromagnetic waves, the integrity is obviously improved, the structural strength is obviously improved, and meanwhile, the physical properties such as material characteristics and heat resistance are excellent. Due to the high-impedance surface, the high-temperature-resistant broadband wave-absorbing structure composite material can selectively absorb electromagnetic waves with different frequencies through different periodic structures, and has excellent tuning capability.

Description

technical field [0001] The invention relates to a wave absorbing material, in particular to a high temperature resistant broadband wave absorbing structure composite material and a preparation method thereof. Background technique [0002] Absorbers reduce reflected echoes by converting electromagnetic waves into heat or other forms of energy, and are increasingly in demand in military and civilian applications. Absorbing materials are usually divided into coating-type absorbing materials and structural absorbing materials. Coated absorbing materials use ferrite, metal powder, chopped fiber, etc. as absorbents to dissolve in organic solvents. Due to the limitation of , its absorption band is usually narrow, and it is easy to peel off during use, and its performance stability is poor. Structural wave absorbing material integrates structural bearing and wave absorption. Through the internal structural design of the material, it can effectively realize the regulation of electro...

Claims

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Application Information

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IPC IPC(8): C09K3/00C04B35/14C04B35/52C04B35/571C04B35/583C04B35/80C25D5/54
CPCC09K3/00C04B35/583C04B35/571C04B35/52C04B35/14C04B35/80C25D5/54C04B2235/5248C04B2235/5228C04B2235/5244C04B2235/616
Inventor 陈照峰肖七巧尚磊
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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