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Preparation method for high-temperature-resistant ultra-thin antenna window

A technology of antenna window and high temperature resistance is applied in the field of preparation of high temperature resistant ultra-thin antenna window, which can solve the problem of difficult processing of antenna window, and achieve the effect of improving rigidity and facilitating processing.

Active Publication Date: 2014-02-26
SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in order to meet the requirements of high temperature resistance and wave transmission, the antenna window is generally made of quartz fiber fabric reinforced ceramic matrix wave transmission composite material. The distance between layers is also controlled between 0.3 and 0.7mm, which is very difficult for antenna windows with a thickness of less than 1mm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Quartz fiber is used to prepare the quartz fiber prefabricated body, the weaving method is 2.5D, and the weaving parameters ensure that the thickness of each layer of fiber is 0.3mm. First, the quartz fiber prefabricated body is soaked in nitric acid, and then the quartz prefabricated body is boiled to remove the sizing agent. During the boiling process, the water reaches a boiling state, and the water is changed every 4 hours, and the water becomes clear after 5 times of water changes;

[0029] The quartz fiber preform is pressurized at a pressure of 35 MPa, the thickness is reduced by 25%, and kept in a fixed state for 20 hours, and then the quartz preform is dried.

[0030] For the first time, high-purity silica sol with a solid content of 58% was used to carry out liquid-phase impregnation and compounding of the preformed quartz fiber preform, and the process was assisted by vacuuming and pressure measures. After the gel was dried and heat-treated at 300 ° C; The hi...

Embodiment 2

[0038] Quartz fiber is used to prepare quartz fiber prefabricated body. The weaving method is needle punching. The weaving parameters ensure that the thickness of each layer of fiber is 0.2mm. During the boiling process, the water reaches a boiling state, and the water is changed every 5 hours, and the water becomes clear after 7 times of water changes.

[0039] Pressurize the quartz fiber preform at a pressure of 15 MPa, reduce the thickness by 30%, keep it in a fixed state for 15 hours, and then dry the preform.

[0040] For the first time, high-purity silica sol with a solid content of 55% was used to liquidize the pretreated quartz fiber preform.

[0041] Phase impregnation compound molding, process assisted vacuuming, pressure measures, after gelation, dry heat treatment at 250°C, and then use high-purity silica sol with a solid content of 38% for compounding, process assisted vacuuming, pressure measures, after gelation at 250°C Dry heat treatment at ℃, and then use hig...

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Abstract

The invention relates to a preparation method for a high-temperature-resistant ultra-thin antenna window and belongs to the technical field of ceramic-based composite materials. According to the method, the high-temperature-resistant ultra-thin antenna window is prepared by a series of processes of preparation of a perform, repeated dipping of high-purity silica sol, improvement of rigidity of the composite material, machining, washing, pickling, carbon heat removal, secondary repeated dipping of the high-purity silica sol and ceramic thermal treatment. The ultra-thin antenna window prepared by the method disclosed by the invention can meet a requirement on high-temperature resistance and is also high in rigidity and high in machinable property.

Description

technical field [0001] The invention belongs to the technical field of ceramic-based composite materials, and in particular relates to a method for preparing a high-temperature-resistant ultra-thin antenna window. Background technique [0002] With the improvement of precision guidance of missiles, in order to meet the requirements of long-distance, high-speed, and high-fidelity transmission of high-frequency communications, the antenna window material of the key component of the missile should have excellent dielectric properties. In order to meet the dielectric properties of antenna window materials The wall thickness design of the antenna window is getting thinner and thinner. Among them, the shape design of the antenna window is complex, and the thickness of the wave-transmissive area of ​​the antenna window of many models is designed to be less than 1mm. At present, in order to meet the requirements of high temperature resistance and wave penetration, the antenna windo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/14C04B35/80C04B35/622
Inventor 韦其红王重海王洪升李伶周长灵刘建邵长涛翟萍董波
Owner SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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