High-temperature wide-frequency wave-transparent composite material and preparation method thereof

A composite material and high-temperature technology, which is applied in the field of high-temperature broadband wave-transparent composite materials and their preparation, can solve the problems of porous ceramic surface roughness, affecting the performance of wave-transmitting materials, and sensitivity to dielectric loss, etc., and achieve good bonding strength

Inactive Publication Date: 2011-10-26
ZHONGCAI HIGH NEW MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because porous ceramic materials are easy to absorb moisture, their dielectric loss is extremely sensitive to water, and water absorption will seriously affect the performance of wave-transparent materials; The bending strength is greatly reduced

Method used

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  • High-temperature wide-frequency wave-transparent composite material and preparation method thereof
  • High-temperature wide-frequency wave-transparent composite material and preparation method thereof
  • High-temperature wide-frequency wave-transparent composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 200g of lithium-aluminum-silicon ceramic powder, 1g of binder methyl cellulose, 80ml of distilled water, and ball-mill it into a slurry at a ball-milling speed of 800r / min and a ball-milling time of 36h. Porous silicon nitride is selected as the matrix, and the matrix is After processing and ultrasonic cleaning, the coating is sprayed on the surface of the porous silicon nitride substrate by spraying. The pressure of the high-pressure spray gun is controlled at 0.2-0.6Mpa. After spraying, it is dried in a drying oven at 80°C for 26 hours, and then placed in a vacuum pressureless furnace for sintering at 1200°C. The heating time is 10 hours, and the temperature is kept at 1200°C for 3 hours. In this way, a broadband wave-transparent silicon nitride material is obtained.

Embodiment 2

[0027] Weigh 55g of lithium-aluminum-silicon ceramic powder, 1g of binder methyl cellulose, 20ml of distilled water, and ball mill it into a slurry. After processing and ultrasonic cleaning, the coating is sprayed on the surface of the porous silicon nitride substrate by spraying. The pressure of the high-pressure spray gun is controlled at 0.2-0.6Mpa. After spraying, it is dried in a drying oven at 60°C for 36 hours, and then placed in a vacuum pressureless furnace for sintering at 1100°C. The heating time is 12 hours, and the temperature is kept at 1100°C for 6 hours. In this way, a broadband wave-transparent silicon nitride material is obtained.

Embodiment 3

[0029] Weigh 75g of lithium-aluminum-silicon ceramic powder, 0.2g of binder methyl cellulose, 30ml of distilled water, and ball-mill it into a slurry at a ball-milling speed of 1200r / min and a ball-milling time of 24h. Porous silicon nitride is selected as the matrix, and the matrix is Processing and ultrasonic cleaning are carried out, and a coating is sprayed on the surface of the porous silicon nitride substrate by spraying. The pressure of the high-pressure spray gun is controlled at 0.2-0.6Mpa. After spraying, it is dried in a drying oven at 100°C for 24 hours, and then placed in a vacuum pressureless furnace for sintering at 1400°C. The heating time is 14 hours, and the temperature is kept at 1100°C for 2 hours. In this way, a broadband wave-transparent silicon nitride material is obtained.

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Abstract

The invention relates to a high-temperature wide-frequency wave-transparent composite material, which is characterized in that the material comprises the following two parts: a porous silicon nitride substrate, and a lithium aluminium silicon composite ceramic coating, wherein the lithium aluminium silicon composite ceramic coating is coated on the surface of the porous silicon nitride substrate. According to the invention, the coating of the silicon nitride substrate surface is dense, smooth, and bright, and has no cracks; good bonding strength is provided between the silicon nitride substrate and the lithium aluminium silicon composite ceramic coating; the prepared material has good dielectric properties, and good ablation resistance, and the insertion loss of the material after ablation is respectively increased by 0.08 dB and 0.02 dB at 2.3 G and 35 G; the material has good impact resistance and oxidation resistance, high strength, high rigidity, and good chemical inertness.

Description

technical field [0001] The invention relates to a high-temperature broadband wave-transmitting composite material and a preparation method thereof, belonging to the field of composite materials. Background technique [0002] Broadband seeker is one of the key technologies of anti-radiation missiles and cruise guidance, and high-temperature broadband wave-transparent materials are the basis of high-speed precision guided missiles, which directly restrict the development of missile technology [1]. With the development of military technology, it is required to further expand the strike range and precise guidance of missiles, and a requirement for broadband wave penetration is put forward for the key component of missiles, the radome. For broadband radome used in a certain frequency range, the wave-transparent material is required to have a very low dielectric constant, so only foam, foam-like or porous materials with low dielectric constant are used as wave-transparent material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B41/87
Inventor 韦其红王重海李伶王洪升李勇程之强陈达谦刘建
Owner ZHONGCAI HIGH NEW MATERIAL
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