Fiber-preform-reinforced aerogel insulating composite material and preparation method thereof
A composite material and prefabricated technology, applied in the field of inorganic materials, can solve the problem of non-contained, and achieve the effect of improving performance, excellent mechanical properties, and good thermal stability
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[0037] Such as figure 1 Shown is the preparation process flow chart of the fiber prefabricated body reinforced airgel thermal insulation composite material of the present invention; the preparation method of the fiber prefabricated body reinforced airgel thermal insulation composite material of the present invention specifically comprises the following steps:
[0038](1) Disperse ceramic fiber, opacifying agent and silica sol in deionized water to obtain ceramic fiber slurry, wherein the mass ratio of ceramic fiber, opacifying agent, silica sol and deionized water is 1:0.1~0.5:0.01~ 0.1: 40-120.
[0039] In this step, the ceramic fiber, opacifying agent and silica sol can be mixed first to prepare a fiber prefabricated body as a reinforcement, and then dispersed in deionized water.
[0040] (2) The ceramic fiber slurry is suction-filtered to obtain a fiber preform wet body; the water content in the fiber preform wet body is 75%-90% (mass percentage content of water).
[0041...
Embodiment 1
[0047] (1) Disperse 104g of quartz fiber, 31g of alumina fiber, 14g of zirconia, and 1.5g of silica sol in 13.5kg of deionized water, and stir until uniform to obtain fiber slurry;
[0048] (2) forming the above-mentioned slurry by suction filtration to obtain a filter cake; shaping to a thickness of 25mm; water content in the filter cake is 82%;
[0049] (3) drying the above filter cake in an oven at 100°C for 30 hours to obtain a fiber preform;
[0050] (4) Use the pre-configured Al 2 o 3 -SiO 2 The fiber preform is impregnated with sol; after gelation, it is aged in ethanol for 48 hours, and then supercritically dried in ethanol at a drying temperature of 250°C and a pressure of 8MPa.
[0051] The above materials were heat-treated in a high-temperature furnace at 1000°C for 1 hour, and the linear shrinkage in the plane direction was 0; the thermal conductivity at room temperature was 0.040W / m·K (test standard GB / T10295-2008).
[0052] Such as figure 2 Shown is the cer...
Embodiment 2
[0055] (1) Disperse 104g of quartz fiber, 31g of mullite fiber, 1.75g of silica sol, and 14g of silicon carbide in 13.5kg of deionized water, and stir until uniform to obtain a fiber slurry;
[0056] (2) The above slurry is suction-filtered to obtain a filter cake; shaped to a thickness of 25mm; the water content in the filter cake is 90%.
[0057] (3) drying the above filter cake in an oven at 100°C for 60 hours to obtain a fiber preform;
[0058] (4) with pre-configured SiO 2 The fiber preform is impregnated with sol; after gelation, it is aged in ethanol for 72 hours, and then supercritically dried in ethanol at a drying temperature of 250°C and a pressure of 8MPa.
[0059] The above materials were heat-treated in a high-temperature furnace at 1000°C for 1 hour, and the linear shrinkage in the plane direction was 0.5%; the thermal conductivity at room temperature was 0.029W / m·K (test standard GB / T10295-2008).
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