Preparation method of high-temperature-resistant aluminum oxide-silicon oxide aerogel composite material
A silica airgel and composite material technology, applied in the field of thermal insulation materials, can solve the problems of poor infrared radiation blocking ability, difficult forming, low strength, etc., achieve good thermal insulation performance and mechanical properties, increase the degree of compactness, Effect of suppressing heat conduction
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Embodiment 1
[0027] Embodiment 1: A kind of preparation method of high temperature resistant alumina-silica airgel composite material, it is characterized in that, the steps are as follows:
[0028] (1) Fully disperse and mix nano-alumina airgel powder, micron silicon carbide infrared light-shielding agent and alumina short fiber to obtain mixture A, wherein, in parts by mass, nano-alumina airgel powder: micron carbonization Silicon infrared sunscreen agent: alumina short fiber=60:45:8;
[0029] (2), the mixture A in the step (1) was pressed and formed under 7.5MPa, and kept under pressure for 40s to obtain an alumina composite material;
[0030] (3) Preparation of silica sol: Mix silicon source, ethanol and water evenly, then add catalyst and stir evenly to obtain silica sol;
[0031] (4) Impregnation treatment: pressurize and impregnate the alumina composite material obtained in step (2) into the silica sol obtained in step (3) to obtain an alumina-silica wet gel material;
[0032] (5)...
Embodiment 2
[0037] A method for preparing a high-temperature resistant alumina-silica airgel composite material, characterized in that the steps are as follows:
[0038] (1) Fully disperse and mix nano fumed alumina powder, micron alumina airgel powder, micron zirconia infrared sunscreen, chopped glass fiber and chopped mullite fiber to obtain a mixture A, wherein In parts, nanometer fumed alumina powder: micron alumina airgel powder: micron zirconia infrared sunscreen agent: chopped glass fiber: chopped mullite fiber=55:4:40:3:2;
[0039] (2), the mixture A in the step (1) was pressed and formed under 6MPa, and the pressure was maintained for 70s to obtain an alumina composite material;
[0040] (3) Preparation of silica sol: Mix silicon source, ethanol and water evenly, then add catalyst and stir evenly to obtain silica sol;
[0041] (4) Impregnation treatment: immerse the alumina composite material obtained in step (2) in the silica sol obtained in step (3) under normal pressure to ob...
Embodiment 3
[0046] A method for preparing a high-temperature resistant alumina-silica airgel composite material, characterized in that the steps are as follows:
[0047] (1) Fully disperse and mix nano-alumina airgel powder, nano-fumed alumina powder, nano-titanium dioxide infrared sunscreen and chopped carbon fiber to obtain a mixture A, wherein, in parts by mass, nano-alumina airgel Powder: nano fumed alumina powder: nano titanium dioxide infrared sunscreen agent: chopped carbon fiber=20:25:35:2;
[0048] (2), the mixture A in the step (1) is pressed and formed under 5 MPa, and the pressure is maintained for 100s to obtain an alumina composite material;
[0049] (3) Preparation of silica sol: Mix silicon source, ethanol and water evenly, then add catalyst and stir evenly to obtain silica sol;
[0050] (4) Impregnation treatment: pressurize and impregnate the alumina composite material obtained in step (2) into the silica sol obtained in step (3) to obtain an alumina-silica wet gel mate...
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