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A kind of preparation method of sibon wave transparent material

A raw material, the technology of tetraethyl orthosilicate, applied in the field of aviation materials, can solve the problems of low strength at room temperature, low strength, and few wave-transmitting materials, and achieve excellent dielectric properties, stable mechanical properties, and promote development.

Inactive Publication Date: 2017-08-25
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The operating temperature range of resin-based composite materials is generally 100°C-400°C, but the strength is low at high temperatures and cannot be applied to high-speed flying aircraft; wave-transparent materials based on silica have good thermal shock resistance, The dielectric constant is also low, which is beneficial to the signal reception of the internal antenna, but its room temperature strength is not high; the wave-transmitting material based on nitride has high thermal stability, and the bending strength can reach between 100MPa-200MPa , the dielectric constant is 7-9, which is not conducive to the signal reception of the internal antenna
Although there are many types of wave-transparent materials, there are still relatively few wave-transparent materials suitable for hypersonic vehicles
[0004] Boron nitride ceramic wave-transmitting materials have the advantages of high strength, high toughness, and relatively low dielectric constant, but the wave-transmitting rate at high temperatures is greatly reduced and cannot meet the conditions of use at high temperatures; the performance of quartz ceramic wave-transmitting materials are relatively balanced, but the erosion resistance is poor, which restricts its application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The raw material composition and particle size requirements for preparing SiBON wave-transparent materials at high temperature are: ethyl orthosilicate, the mass fraction of silicon dioxide is 48.0%-50.0%; boric acid, analytically pure; deionized water; metal silicon powder, 45μn; high-purity nitrogen.

[0017] Calculate the amount of ethyl orthosilicate based on the Si-B ratio, slowly add ethyl orthosilicate to a 3% boric acid solution, use sodium dodecylbenzene sulfonate as a surfactant, and magnetically Stir and let it stand to form a gel after the dropwise addition is completed. The gel was dried in a constant temperature drying oven at 120°C. After the dry gel is finely ground, it is mixed with 45 μm metal silicon powder according to a predetermined ratio, and put into a planetary ball mill for dry grinding for 12 hours until the raw materials are evenly dispersed. The raw materials were dry-pressed, and the sample was placed in an atmosphere furnace protected by...

Embodiment 2

[0020] The raw material composition and particle size requirements for preparing SiBON wave-transparent materials at high temperature are: ethyl orthosilicate, the mass fraction of silicon dioxide is 48.0%-50.0%; boric acid, analytically pure; deionized water; metal silicon powder, 45μm; high-purity nitrogen.

[0021] Calculate the amount of ethyl orthosilicate based on the Si-B ratio, slowly add ethyl orthosilicate to a 3% boric acid solution, use sodium dodecylbenzene sulfonate as a surfactant, and magnetically Stir and let it stand to form a gel after the dropwise addition is completed. The gel was dried in a constant temperature drying oven at 120°C. After the dry gel is finely ground, it is mixed with 45 μm metal silicon powder according to a predetermined ratio, and put into a planetary ball mill for dry grinding for 12 hours until the raw materials are evenly dispersed. The raw materials were dry-pressed, and the sample was put into an atmosphere furnace protected by ...

Embodiment 3

[0024] The raw material composition and particle size requirements for preparing SiBON wave-transparent materials at high temperature are: ethyl orthosilicate, the mass fraction of silicon dioxide is 48.0%-50.0%; boric acid, analytically pure; deionized water; metal silicon powder, 45μm; high-purity nitrogen.

[0025] Calculate the amount of ethyl orthosilicate based on the Si-B ratio, slowly add ethyl orthosilicate to a 3% boric acid solution, use sodium dodecylbenzene sulfonate as a surfactant, and magnetically Stir and let it stand to form a gel after the dropwise addition is completed. The gel was dried in a constant temperature drying oven at 120°C. After the dry gel is finely ground, it is mixed with 45 μm metal silicon powder according to a predetermined ratio, and put into a planetary ball mill for dry grinding for 12 hours until the raw materials are evenly dispersed. The raw materials were dry-pressed, and the sample was placed in an atmosphere furnace protected by...

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Abstract

The invention relates to a preparation method of a SiBON wave-transparent material, which belongs to the technical field of aviation materials. It is characterized by using tetraethyl orthosilicate, boric acid, and metal silicon powder as raw materials, using metal silicon powder to reduce SiBON powder materials, and then using the prepared powder to prepare SiBON ceramic materials, achieving excellent dielectric properties and mechanical properties. Stable wave-transmitting materials provide strong support for the replacement of radome materials and the development of the aerospace industry. It has reference significance for the future research on the performance of SiBON materials.

Description

technical field [0001] The invention relates to a preparation method of a SiBON wave-transparent material, which belongs to the technical field of aviation materials. Background technique [0002] In recent years, with the continuous launch of the Shenzhou series spacecraft, my country's aerospace industry is booming, and the demand for various aerospace materials is increasing. Among them, wave-transparent materials are the key factors restricting the development of aerospace technology. Wave-transparent materials refer to materials that can transmit electromagnetic waves within the wavelength range of 1-1000mm, and the transmittance is required to reach 70%. In order to ensure the normal operation of internal devices, wave-transparent materials are required to have good dielectric properties, strength, fracture toughness, thermal shock resistance, and erosion and wear resistance. [0003] At present, there are mainly the following types of wave-transmitting materials: re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/597C04B35/622
Inventor 唐潮房明浩黄朝晖刘艳改吴小文闵鑫
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)