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Low-temperature preparation method of ceramic coating absorbing waves in frequency band of 8-18 GHz

A ceramic coating and low-temperature technology, which is applied in coatings, radiation-absorbing coatings, metal material coating processes, etc., can solve the problems of unsuitable temperature and low temperature resistance, and achieve optimized microwave absorption performance and improved microwave absorption performance, wide range of applications

Inactive Publication Date: 2017-04-26
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thermal spraying method needs to heat the coating material to a molten or semi-molten state, so it is not suitable for refractory materials and the temperature is high
At the same time, there is a certain proportion of CFCC whose temperature resistance is lower than the sintering problem of ceramics
It can be seen that the above methods have certain limitations when applied to the preparation of CFCC absorbing coatings.

Method used

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  • Low-temperature preparation method of ceramic coating absorbing waves in frequency band of 8-18 GHz
  • Low-temperature preparation method of ceramic coating absorbing waves in frequency band of 8-18 GHz
  • Low-temperature preparation method of ceramic coating absorbing waves in frequency band of 8-18 GHz

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preparation example Construction

[0031] Aiming at the preparation process of the wave absorbing coating, the present invention proposes a low-temperature preparation method of the coating that combines the "painting technology" with the "chemical vapor deposition technology". figure 1 shown. The preparation process mainly includes the following three core links:

[0032] (1) batching, mix the wave absorbing agent with the materials such as binder, plasticizer and solvent evenly;

[0033] (2) painting, evenly painting the mixed slurry in (1) on the surface of the base material;

[0034] (3) Deposition, in (2) the chemical vapor deposition of the wave-transmitting coating on the surface of the material.

[0035] Specifically, firstly, ingredients are the basic link of the present invention. In order to evenly coat the wave absorber on the surface of the composite material, it is necessary to add a variety of organic substances to form a slurry with a certain viscosity. The organic components added include: ...

Embodiment 1

[0041] The two-dimensional SiC fiber toughened SiBCN matrix composite material was selected as the base material, and the material size was 180mm×180mm×3.2mm. The mixed powder formed by 40wt.% A powder and 60wt.% B powder is selected as the wave absorbing agent (wherein, the A powder is the SiBCN powder containing nano-SiC that has undergone high temperature heat treatment, and the B powder is the nanometer-free powder that has not been heat treated at high temperature. SiC SiBCN powder). The volume fraction of mixed powder in the slurry is 30%, the volume fraction of solvent is 60%, the volume fraction of dispersant and binder is 3%, and the volume fraction of plasticizer and defoamer is 2%. Brushing was started immediately after the slurry was sonicated for 2 hours. After painting, the composites were allowed to stand for 12 hours in room temperature air. After the slurry was dried in the shade, the composite material was placed in a vacuum reactor for chemical vapor depos...

Embodiment 2

[0043] select Al 2 O 3 The fiber mat reinforced SiCN matrix composite material was used as the base material, and the material size was 180mm×180mm×2mm. Multi-walled carbon nanotubes (MWCNTs) were selected as the absorber. The volume fraction of wave absorber in the slurry is 15%, the volume fraction of solvent is 75%, the volume fraction of dispersant and binder is 3%, and the volume fraction of plasticizer and defoamer is 2%. Brushing was started immediately after the slurry was sonicated for 1 hour. After painting, the composites were allowed to stand for 12 hours in room temperature air. After the slurry was dried in the shade, the composite material was placed in a vacuum reactor for chemical vapor deposition B 4 C. The reaction temperature is 950℃, and the precursor system is BCl 3 -CH 4 -H 2 -Ar, [B]:[C]=3:1. After the preparation of the absorbing coating was completed, the electromagnetic properties of the composite materials were tested in the range of 8-18 G...

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Abstract

The invention relates to a low-temperature preparation method of a ceramic coating absorbing waves in the frequency band of 8-18 GHz. Firstly, the surface of a substrate material is uniformly brushed with slurry containing a wave absorbing agent by adopting a brushing method, and a wave-transmitting layer is prepared on the surface of the wave absorbing agent through a chemical vapor deposition technology after standing and drying in the shade. The wave absorbing coating and the substrate material are well bonded, and the wave absorbing performance of the material can be remarkably improved. The method has very strong designability, for example, a coating structure and components can be optimized by adjusting the type of wave absorbing agents, the type of wave-transmitting layers, deposition time and other parameters, and accordingly the substrate material can obtain good wave absorbing performance.

Description

technical field [0001] The invention relates to a low-temperature preparation method of a wave-absorbing ceramic coating, in particular to the preparation of a wave-absorbing coating in the frequency band of 8-18 GHz on the surface of a base material through two core steps of painting and chemical vapor deposition (CVD). layer method. Background technique [0002] The rapid development of modern radar technology, electronic technology and military technology makes the research and demand of high temperature absorbing materials more and more urgent in various countries. High-temperature absorbing materials mainly include high-temperature absorbing ceramics and high-temperature structural absorbing materials. High-temperature structural absorbing materials are regarded as the most potential high-temperature absorbing materials due to their combined bearing / absorbing properties. [0003] Continuous fiber toughened ceramic matrix composites (CFCC) have high strength and toughn...

Claims

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Application Information

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IPC IPC(8): C04B41/89C23C16/34C23C16/32C23C16/36B05D7/00B05D7/14B05D7/02B05D7/24C09D5/32C09D129/14C08J7/04
CPCC04B41/89B05D7/00B05D7/02B05D7/14B05D7/24B05D2203/30C04B41/009C04B41/52C08J7/042C08K3/04C08K7/10C08K7/24C08K2201/011C09D5/32C09D129/14C23C16/32C23C16/342C23C16/345C23C16/36C04B41/5059C04B41/46C04B41/4873C04B41/5001C04B41/5049C04B41/5032C04B41/5066C04B41/5058C04B41/5064C04B35/806C04B35/584
Inventor 殷小玮叶昉刘晓菲莫然成来飞张立同
Owner NORTHWESTERN POLYTECHNICAL UNIV
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