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Composite material for radome/antenna window and preparation method thereof

A radome and composite material technology, applied in the field of materials, can solve the problems of high dependence on precursor synthesis technology, complex equipment, and limitations in performance, and achieve improved mechanical properties, thermal shock resistance, excellent dielectric properties, and enhanced The effect of strength and toughness

Active Publication Date: 2021-11-02
江西信达航科新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] SiO 2f / SiO 2 The methods of introducing BN into composite materials mainly include high-temperature powder sintering and borazane-based impregnation and pyrolysis (Precusor Infiltration and Pyrolysis, PIP) method. There are many restrictions, and although the PIP method has many advantages such as precursor designability, good manufacturability and processability, it is highly dependent on the synthesis technology of the precursor, the equipment is complicated, and the cost is very high

Method used

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  • Composite material for radome/antenna window and preparation method thereof
  • Composite material for radome/antenna window and preparation method thereof
  • Composite material for radome/antenna window and preparation method thereof

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preparation example Construction

[0030] SiO used for a radome / antenna window of the present invention 2f / SiO 2 A method for preparing a composite material, comprising the steps of:

[0031] (1) Carry out heat treatment to quartz fiber prefabricated body under air environment; Add chopped quartz fiber to silica sol, stir evenly, then put quartz fiber prefabricated body into silica sol, vacuum hold pressure, dry, get the gel material;

[0032](2) Sinter the gel material under a protective gas atmosphere, and measure the density of the obtained material; repeat the sintering step until the preset density is reached, that is, SiO 2f / SiO 2 composite materials;

[0033] (3) SiO 2f / SiO 2 The composite material is placed in a chemical vapor deposition furnace, vacuumed, the precursor gas and the carrier gas are introduced, the temperature of the furnace is raised to 1000-1200 ° C and kept for 0.5-1 hour, then the temperature is raised to 1400-1450 ° C, cooled to Deposition is complete after room temperature...

Embodiment 1

[0039] Preparation of BN-modified SiO for radome / antenna window 2f / SiO 2 Composite material, including steps:

[0040] (1) Heat treatment of the quartz fiber preform: heat the quartz fiber preform to 250°C in an air environment for 1 hour, keep it warm for 2 hours, and cool to room temperature with the furnace;

[0041] (2) Preparation of gel material: add heat-treated chopped quartz fibers with a length of 200 μm to the silica sol, the content is 5 wt.%, and stir evenly; put the preform into the silica sol solution, vacuumize and hold the pressure at 0.5 hour; take it out, and dry it in a muffle furnace at 80°C for 4 hours to obtain a gel material;

[0042] (3) Put the gel material in (2) into a vacuum furnace, feed nitrogen gas, and the flow rate is 50ml / min; heat up to 650°C in 2 hours, keep it warm for 4 hours, then cool to room temperature in 4 hours, and measure the density;

[0043] (4) Repeat step (3) until the density reaches 1.7g / cm 3 ;

[0044] (5) the product...

Embodiment 2

[0046] Preparation of BN-modified SiO for radome / antenna window 2f / SiO 2 Composite material, including steps:

[0047] (1) Heat treatment of the quartz fiber preform: heat the quartz fiber preform to 300°C in an air environment for 2 hours, keep it warm for 2 hours, and cool to room temperature with the furnace;

[0048] (2) Preparation of gel material: add heat-treated chopped quartz fibers with a length of 400 μm to the silica sol, with a content of 8 wt.%, and stir evenly; put the preform into the silica sol solution, vacuumize and hold the pressure for 1 hour; take it out, and dry it in a muffle furnace at 80°C for 8 hours to obtain a gel material;

[0049] (3) Put the gel material in (2) into a vacuum furnace, pass in argon gas, and the flow rate is 100ml / min; heat up to 800°C in 4 hours, keep it warm for 2 hours, then cool to room temperature in 2 hours, and measure the density;

[0050] (4) repeat step (3), until density reaches 1.7g / cm3;

[0051] (5) the product o...

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Abstract

The invention discloses a radome / antenna window SiO 2f / SiO 2 Composite material and preparation method thereof, the preparation steps comprising: preparing chopped quartz fiber modified SiO 2f / SiO 2 composite material, the SiO 2f / SiO 2 The composite material is placed in a chemical vapor deposition furnace, and under vacuum conditions, it is fed with boron trihalide, NH 3 and B(N(CH 3 ) 2 ) 3 Precursor gas, deposition to get BN-modified SiO 2f / SiO 2 composite material. The BN coating prepared by the invention has good mechanical properties and excellent dielectric properties, and at the same time, a compressive stress layer is formed on the surface of the radome / antenna window, which improves the mechanical properties and thermal shock resistance of the radome / antenna window.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a high-strength, high-temperature-resistant radome / antenna window SiO 2f / SiO 2 Composite materials and methods for their preparation. Background technique [0002] The radome / antenna window is set on the head or side of the high-speed aircraft, which is used to protect the normal operation of the communication system on the aircraft and ensure the equipment for signal transmission. Generally, the composite materials used for the radome / antenna window are required to have good mechanical properties performance, thermal and dielectric properties. With the continuous improvement of aircraft speed, high Mach number aircraft put forward higher requirements on the performance of radome / antenna window. At present, the improvement of the performance of the radome / antenna window is mainly improved from the selection of raw materials and the optimization of the structure....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/82C04B35/14C04B35/622C04B35/624C04B41/85H01Q1/42
CPCC04B35/14C04B35/622C04B35/624C04B35/82C04B41/5064C04B41/85C04B2235/386C04B2235/616C04B2235/6562C04B2235/6567C04B2235/658C04B2235/96H01Q1/42C04B41/4531
Inventor 吴宝林侯振华
Owner 江西信达航科新材料科技有限公司