Wave-transmission and thermal-insulation material with high-temperature radiation resistance and preparation method of material

A heat-insulating material and high-temperature-resistant technology, which is applied in the field of high-temperature-resistant radiation-transparent wave-transparent heat-insulation materials and their preparation, can solve problems such as uncontrollable, large differences in particle diameters of opacifying agents, and insufficient performance of high-temperature-resistant radiation-transparent wave-transparent heat insulation, etc. , to achieve the effect of good electrical performance

Active Publication Date: 2017-08-11
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these patents did not use high-purity chromium salt complexes, and did not go through high-temperature sintering steps, which could not remove small organic molecules and metal impurities in the raw materials; It is expected to form chromium trioxide grains

Method used

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  • Wave-transmission and thermal-insulation material with high-temperature radiation resistance and preparation method of material

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preparation example Construction

[0021] Specifically, the present invention provides a method for preparing a heat-resistant, radiation-resistant, wave-transparent and heat-insulating material, the method comprising the following steps:

[0022] (1) Preparation of chromium salt complex

[0023] In the present invention, chromium nitrate, chromium phosphate or chromium acetate are taken as examples, but not limited thereto, add water (such as pure water) or alcohol solution to dissolve and dilute, and then add a certain concentration of weakly alkaline solvent to control its pH The value is 7-8, fully stirred evenly to obtain a chromium salt complex solution; in the present invention, the dosage and concentration of the chromium salt complex are adjusted so that the mass ratio of chromium trioxide to wave-transparent fiber reinforcement is 1:0.05 ~0.15.

[0024] (2) Dipping

[0025] Use the chromium salt complex solution to impregnate wave-transparent fiber reinforcements; in the present invention, the glass...

Embodiment 1

[0040] Dissolve chromium nitrate in ethanol solvent at a ratio of 1:2, and then stir for about 20 minutes to dissolve completely, then slowly add ammonia solution with a concentration of 1M into the chromium nitrate solution, and slowly drop until the solution reaches The pH value is 8, continue to stir for 30 minutes to obtain a chromium salt complex solution, and then inject it with a density of 0.1g / cm 3 In the quartz fiber-reinforced matrix, put it into a 100°C oven to dry after the sol-gel, and then put it into a muffle furnace at 600°C for 2 hours, then put the fiber preform into the mold, and use vacuum Silica sol and prefabricated body are compounded by compression molding, and then aged at room temperature for 36 hours and high temperature aged at 90°C for 36 hours. After the aging is completed, the acetone solvent is replaced twice, and then supercritical carbon dioxide is dried, and then methyl trimethyl Oxysilane was subjected to vapor-phase hydrophobic and moistur...

Embodiment 2

[0042] Dissolve chromium acetate into the water solvent at a ratio of 1:3, and then stir for about 25 minutes to dissolve completely, then slowly add ammonia solution with a concentration of 1M into the chromium acetate solution, and slowly add it dropwise until the solution reaches The pH value is 8, continue to stir for 30 minutes to obtain a chromium salt complex solution, and then inject it with a density of 0.1g / cm 3 In the mullite fiber-reinforced matrix, put it into a 100°C oven for drying after the sol-gel, and then put it in a 600°C muffle furnace for 2 hours, and then put the fiber preform into the mold, Silica sol and prefabricated body are compounded by vacuum pressing molding, and then subjected to room temperature aging for 36 hours and high temperature aging at 90°C for 36 hours. Trimethoxysilane was subjected to gas-phase hydrophobic and moisture-proof treatment to obtain a thermal insulation sample. The density of the high temperature-resistant wave-transpare...

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Abstract

The invention provides a wave-transmission and thermal-insulation material with high-temperature radiation resistance and a preparation method of the material. Specifically, the method comprises steps as follows: chromic salt is diluted and dissolved, an alkaline reagent is added, and a chromium salt complex solution is obtained; wave-transmission fiber reinforcement is soaked with the chromium salt complex solution, treated with sol-gel and dried, and a fiber preform is obtained; the fiber preform is sintered, and a chromium (III) oxide composited fiber reinforcement matrix is obtained; the fiber reinforcement matrix is soaked with silicon dioxide sol, treated with sol-gel, subjected to aging and solvent replacement and dried, and a fiber reinforced aerogel composite material is obtained; the fiber reinforced aerogel composite material is subjected to dampproof treatment, and the wave-transmission and thermal-insulation material with high-temperature radiation resistance is obtained. The invention further provides the wave-transmission and thermal-insulation material with high-temperature radiation resistance and an application of the material. According to the method, grain size and crystal form of chromium (III) oxide can be controlled, and excellent high-temperature radiation resistance and dielectric property of the material are guaranteed.

Description

technical field [0001] The invention relates to a high-temperature radiation-resistant wave-transparent heat insulation material and a preparation method thereof, belonging to the technical field of heat protection. Background technique [0002] Airgel material is a new type of low-density nanoporous material. It is the solid material with the best thermal insulation performance. Airgel is formed by the accumulation of nanoparticles and has a three-dimensional network nanoporous structure, which can significantly reduce the solid thermal conductivity of the material. , convective heat transfer and radiation heat transfer, while airgel is almost transparent to the near-infrared wavelength of 2-10 μm, and at high temperature, the effect of radiation heat transfer is very obvious. If no anti-infrared opacifying agent is added, the high temperature of airgel The heat insulation effect is reduced, and the ratio of each heat transfer path in the airgel can be changed after adding ...

Claims

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Application Information

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IPC IPC(8): C04B28/26
CPCC03C25/42C04B20/04C04B28/26C04B30/02C04B41/009C04B41/4905C04B2201/20C04B20/0048C04B14/307C04B14/42C04B14/4656C04B14/4625C04B14/064C04B40/0231
Inventor 张丽娟李文静成睿叶冉冉赵英民刘斌金兆国
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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