Preparation method for high-temperature-resistant gradient fiber composite aerogel thermal-insulation material
A fiber composite and thermal insulation material technology, applied in chemical instruments and methods, ceramic products, lamination, etc., can solve problems such as difficult machining, molding, difficult large-scale application, low airgel strength, etc., to achieve Improve temperature resistance, improve heat insulation effect, and increase the effect of using temperature
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example 1
[0026] Silica sol (SiO 2 The particle size is 10nm, the content is 20wt%), absolute ethanol, and deionized water are mixed uniformly at a volume ratio of 1:0.5:0.1 to form a solution, and mixed and stirred at 45°C for 30min to obtain clear SiO 2 For the sol solution, continue to add hydrochloric acid to adjust the pH value of the solution to 4, then immerse the sol solution in the glass fiber felt in the abrasive tool, seal the film, and place it in a vacuum oven at 50°C for 3 hours to obtain a glass fiber composite SiO 2 Wet gel, recorded as fiber composite wet gel A, takes out the abrasive tool, and places aluminum silicate fiber on its upper surface; continue to add silica sol (SiO 2 Particle size is 10nm, content is 20wt%), alumina sol (Al 2 o 3Particle size is 10nm, content is 20wt%), absolute ethanol, deionized water according to the volume ratio according to the volume ratio 1:0.2:0.5:0.2 mix uniformly and make the solution, mix and stir at 45 ℃ for 30min, continue to...
example 2
[0028] Silica sol (SiO 2 The particle size is 20nm, the content is 45wt%), absolute ethanol, and deionized water are mixed uniformly in a volume ratio of 1:2:1 to form a solution, and mixed and stirred at 50°C for 60min to obtain a clear SiO 2 For the sol solution, continue to add hydrochloric acid to adjust the pH value of the solution to 6, then immerse the sol solution in the glass fiber felt in the abrasive tool, seal the film, and place it in a vacuum oven at 60°C for 6 hours to obtain a glass fiber composite SiO 2 Wet gel, recorded as fiber composite wet gel A, takes out the abrasive tool, and places aluminum silicate fiber on its upper surface; continue to add silica sol (SiO 2 Particle size is 20nm, content is 45wt%), alumina sol (Al 2 o 3 The particle size is 20nm, the content is 30wt%), absolute ethanol, and deionized water are mixed uniformly in a volume ratio of 1:5:3:2 to form a solution, mixed and stirred at 50°C for 60min, and continue to add hydrochloric acid...
example 3
[0030] Silica sol (SiO 2 The particle size is 15nm, the content is 30wt%), absolute ethanol, and deionized water are mixed uniformly at a volume ratio of 1:1:0.5 to form a solution, and mixed and stirred at 45°C for 50min to obtain clear SiO 2 For the sol solution, continue to add nitric acid to adjust the pH value of the solution to 5, then immerse the sol solution in the glass fiber felt in the abrasive tool, seal the film, and place it in a vacuum oven at 55°C for 4 hours to obtain a glass fiber composite SiO 2 Wet gel, denoted as fiber composite wet gel A, took out the abrasive tool, and placed aluminum silicate fiber on its upper surface; then silica sol (SiO 2 Particle size is 15nm, content is 30wt%), alumina sol (Al 2 o 3 Particle size is 15nm, content is 25wt%), absolute ethanol, deionized water by volume ratio 1:1:1:1 by volume and mix uniformly to make solution, mix and stir at 50 ℃ for 60min, continue to add nitric acid, adjust The pH value of the solution is 5, ...
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