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Ceramic-based double-layer structure radome and its preparation method

A double-layer structure, radome technology, applied in the fields of aerospace and aviation vehicles, can solve the problems of single material, long process cycle, unsuitable for large-size radomes, etc., and achieve mechanical properties that resist catastrophic damage and good mechanical properties. Effect

Active Publication Date: 2019-11-29
SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing foreign double-layer structure is mainly prepared by chemical vapor deposition, the process cycle is long, and the material is relatively simple, which is not suitable for the development of large-scale radome.

Method used

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  • Ceramic-based double-layer structure radome and its preparation method
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  • Ceramic-based double-layer structure radome and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The dielectric constant of the core layer of the broadband double-layer radome is 2.30±0.05, and the dielectric constant of the surface layer is 4.50±0.05. According to the operating frequency of the antenna and the shape and structure of the radome, the thickness of the core layer and the surface layer of the radome are determined to be 7.3mm and 1.2mm respectively.

[0032] (1) Preparation of core material

[0033] a pretreatment of fiber preform

[0034] The core layer material adopts B-type 195Tex (Tex refers to the weight of a certain length of yarn, generally refers to the quality of 1000m fiber, the unit is g / 1000m) quartz fiber, and the fiber prefabricated body is prepared by weaving 2.5D normal yarns with a volume fraction of 45 %; The preform is heat-treated in a muffle furnace, heated to 460°C at a rate of 10°C / min, kept for 2 hours, and the wetting agent on the surface is removed, then cooled with the furnace, and then soaked in high-purity silica sol soluti...

Embodiment 2

[0050] The dielectric constant of the core layer of the broadband double-layer radome is 2.3±0.05, and the dielectric constant of the surface layer is 4.5±0.05. According to the operating frequency of the antenna and the shape and structure of the radome, the thickness of the core layer and the surface layer of the radome are determined to be 7.1mm and 1.0mm respectively.

[0051] (1) Preparation of core material

[0052] a pretreatment of fiber preform

[0053] The core layer material uses B-type quartz fiber as raw material, and the fabric adopts a three-dimensional four-way weaving structure with a fiber volume fraction of 42%. 2h, remove the wetting agent on the surface, then cool with the furnace, and then soak in the high-purity silica sol solution for more than 6 hours.

[0054] b liquid phase impregnation

[0055] Place the pretreated quartz fiber prefabricated body in a vacuum tank, evacuate to less than 10Pa, and then inhale the quartz slurry, which is prepared by ...

Embodiment 3

[0075] The dielectric constant of the core layer of the broadband double-layer radome is 2.3±0.05, and the dielectric constant of the surface layer is 4.5±0.05. According to the operating frequency of the antenna and the shape and structure of the radome, the thickness of the core layer and the surface layer of the radome are determined to be 14.6mm and 1.8mm respectively.

[0076] (1) Preparation of core material

[0077] a pretreatment of fiber preform

[0078] The core material is made of B-type quartz fiber, the fabric adopts a 2.5D weaving structure, and the fiber volume fraction is 42%. The prefabricated body is heat-treated in a muffle furnace, and the temperature is raised to 520°C at a heating rate of 10°C / min and kept for 2 hours. , remove the wetting agent on the surface, then cool with the furnace, and then soak in the high-purity silica sol solution for more than 6 hours.

[0079] b liquid phase impregnation

[0080] Put the pretreated quartz fiber prefabricated...

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Abstract

The invention belongs to the technical field of aerospace and air vehicles, and in particular relates to a high-temperature-resistant, wide-band double-layer structure radome and a preparation method thereof. The radome body is a double-layer structure composed of a core layer and a surface layer, the core layer is made of quartz fiber reinforced quartz composite material, and the surface layer is made of quartz fiber reinforced nitride-phosphate composite material; the core layer material The dielectric constant is 2.0-3.1, and the dielectric constant of the surface layer material is 4.0-6.0; the core layer and the surface layer are packaged together after impregnation and firing, and processed into a radome. The radome has the characteristics of high temperature resistance, good mechanical properties and resistance to catastrophic damage, and has good wave transmittance in the range of centimeter waves and millimeter waves.

Description

technical field [0001] The invention belongs to the technical field of aerospace and air vehicles, and in particular relates to a high-temperature-resistant broadband double-layer structure radome and a preparation method thereof. Background technique [0002] The missile radome is a key component to ensure the normal operation of the radar antenna system. It is not only a component of the missile body, but also a component of the radar guidance system; it must bear the missile’s aerodynamic load, aerodynamic heating and the harsh environment during flight. It is also necessary to meet the performance requirements of the missile radar system on power transfer coefficient, aiming error and antenna pattern distortion. With the development of spaceflight and aviation technology, missile radome has developed towards the direction of high temperature resistance, erosion resistance, broadband and high wave transmission rate. In recent years, high-performance ceramic wave-transpar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q1/42B32B18/00
Inventor 李伶王洪升韦其红王重海陈达谦翟萍廖荣朱保鑫程洪浩李楠
Owner SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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