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A composite microwave absorbing material using a nail hole matching mode and a preparation method thereof

A technology of composite absorbing materials and matching methods, applied in electrical components, magnetic field/electric field shielding, etc., can solve the problems of insufficient absorbing performance improvement, limited design parameters, single research factors, etc., and achieve improved absorbing performance and design space. Large, wide-ranging effects

Inactive Publication Date: 2019-01-08
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are few relevant research reports. The literature "Li Jianghai, Sun Qin, Ma Yu'e. Analysis of the influence of rivet spacing on the stealth of two-dimensional SRAM skin. In addition to the influence of the absorbing performance of skin components, there is no research on other parameters of rivets, and there is no literature that discusses the influence of openings at the same time.
Due to single research factors and limited design parameters, the improvement of microwave absorption performance is insufficient

Method used

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  • A composite microwave absorbing material using a nail hole matching mode and a preparation method thereof
  • A composite microwave absorbing material using a nail hole matching mode and a preparation method thereof
  • A composite microwave absorbing material using a nail hole matching mode and a preparation method thereof

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Embodiment 1

[0036] In this embodiment, round-headed or hexagonal headless nails and straight-through holes are used, and the nails use wave-transparent SiC f / Si 3 N 4 Composite material, substrate with through holes using absorbing SiC f / Si 3 N 4 composite material. The structural parameters of the nail-hole fit are p=5.0mm, d=a 1 =a 2 = 3.0 mm, l = h = 3.0 mm, k = 0.0 mm, which will be referred to as the nail-hole fitting structure 1 .

[0037] In this example, the reflection loss curves of the wave-absorbing substrate with no nail-hole matching structure and the nail-hole matching structure with a thickness of 3.0mm are as follows image 3 shown. Frequency range from 8 to 18GHz: The minimum reflection loss of the material without the nail-hole matching structure is -11.24dB, and the minimum reflection loss of the material with the nail-hole matching structure is -19.10dB, that is, the strongest absorbing efficiency is increased by 69.9%; The maximum reflection loss of the mat...

Embodiment 2

[0039] In this embodiment, round-head nails and straight blind holes are used, and the nails use wave-absorbing SiC f / Si 3 N 4 Composite material, substrate with blind vias using wave-transparent SiC f / Si 3 N 4 composite material. The structural parameters of the nail-hole fit are p=5.0mm, d=2.0mm, a 1 = 3.0 mm, l = 4.0 mm, h = 5.0 mm, k = 2.0 mm, which will be referred to as the nail-hole fitting structure 2 .

[0040] The reflection loss curves of the wave-transparent substrate with no nail-hole matching structure and the nail-hole matching structure in this embodiment are as follows Figure 4 shown. Frequency range from 8 to 18GHz: The minimum reflection loss of the material is -0.85dB when there is no nail-hole matching structure, and the minimum reflection loss of the material with nail-hole matching structure is -5.6dB, that is, the strongest wave-absorbing performance is improved; no nail hole The maximum reflection loss of the material with the matching struc...

Embodiment 3

[0042] In this embodiment, round-head nails and straight blind holes are used, and the nails use wave-absorbing SiC f / EP composite material, substrate with blind vias in reflective SiC f / EP composite material. The structural parameters of the nail-hole fit are p=30mm, d=20mm, a 1 = 20 mm, l = 15 mm, h = 15, k = 5.0 mm, which is called the nail-hole fitting structure 3 .

[0043] In this embodiment, the reflection loss curves of the reflective substrate without the nail-hole matching structure and the nail-hole matching structure with a thickness of 15 mm are as follows Figure 5 shown. Frequency range from 8 to 18GHz: The reflection loss of the material without the nail-hole matching structure is about -2.01dB, and the minimum reflection loss of the material with the nail-hole matching structure is -40.93dB, that is, the strongest wave-absorbing efficiency has increased by 1936.3%. The maximum reflection loss is -6.09dB, that is, the weakest absorbing efficiency is incre...

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Abstract

The invention relates to a composite microwave absorbing material and a preparation method thereof by using a nail hole fitting mode, wherein the nail hole fitting structure is periodically and uniformly arranged as an integral microwave absorbing material. The nail comprises a round head nail and a hexagonal nail, and a countersunk head nail which is matched with a stepped hole; The holes includethrough holes and blind holes, straight holes and stepped holes. The introduction of the pin hole fitting mode of the invention expands the application of the microwave transmission type and the reflection type substrate materials which do not have the microwave absorption performance in the microwave absorption field, and enhances the microwave absorption performance of the microwave absorptiontype ceramic matrix and the resin matrix composite materials through the introduction of the microwave transmission pin. The application of transparent and reflective ceramic matrix composites and resin matrix composites in electromagnetic wave absorption field is widened by the introduction of pin hole junction.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave absorption, and relates to a composite wave-absorbing material using a nail-hole fit method and a preparation method, in particular to a design / forming method for improving the wave-absorbing performance of a composite material by using a nail-hole fit method. Background technique [0002] Fiber-reinforced composites (such as fiber-reinforced resin-based composites suitable for low temperatures and fiber-reinforced ceramic-based composites suitable for high temperatures) are recognized as aircraft, It is an excellent candidate material for the surface skin structure of missiles and other aircraft or the hot end parts of aero-engines. In recent years, with the rapid development of all-round detection technology and the widening of the working frequency band of various electromagnetic equipment, the problem of radar stealth (ie absorbing) of weapons and equipment needs to be solved urge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00
Inventor 叶昉殷小玮周倩刘永胜成来飞张立同
Owner NORTHWESTERN POLYTECHNICAL UNIV