Preparation method of thermal insulation material for crash surviving memory
A technology of thermal insulation material and storage, which is applied in the field of thermal insulation materials, can solve the problems of high temperature thermal protection failure, poor high temperature thermal insulation performance of thermal insulation materials, etc., and achieves improved thermal insulation performance, good high temperature resistance performance, and improved high temperature resistance performance. Effect
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Embodiment 1
[0028] Preparation of porous fiber skeleton: immerse 38g of aluminum silicate fiber in aqueous hydrochloric acid solution with pH = 3, stir to dissolve the slag balls contained in the fiber, then rinse repeatedly with deionized water until neutral, mix with 3.8g of soluble starch, BN powder Add 7.6g into 1000ml of water together, and disperse evenly to obtain fiber slurry; copy the fiber slurry into a shaping mold, pressurize 0.8KPa, and release the mold after holding the pressure for 2 hours to obtain a fiber skeleton with a regular shape; then put it Put it into a muffle furnace, sinter at 1000°C for 60 minutes, and take out the porous fiber skeleton after cooling;
[0029] Preparation of composite sol: Mix aluminum sec-butoxide, ethanol, and water at a molar ratio of 1:12:0.8 at 60°C, and then cool to room temperature to obtain alumina sol. Then, tetraethyl orthosilicate was added, hydrochloric acid was stirred for 60 minutes, 3.8 g of potassium hexatitanate, acetone, and a...
Embodiment 2
[0037] Preparation of porous fiber skeleton: immerse 26g of polycrystalline mullite fiber in an aqueous nitric acid solution with pH=2, stir to dissolve the slag balls contained in the fiber, then rinse repeatedly with deionized water until neutral, and mix with 2.6g of polyacrylamide, Dispersant sodium dodecylbenzene sulfonate 1g, BN powder 2.6g were added to 800ml water together, the fiber slurry was obtained after dispersing evenly; the fiber slurry was copied into the shaping mold, pressurized at 0.5KPa, held for 2 hours and then removed. mold to obtain a fiber skeleton with a regular shape, then put it into a muffle furnace, sinter at 1100°C for 30min, and take out the porous fiber skeleton after cooling;
[0038] Preparation of composite sol: replace ethyl orthosilicate in Example 1 with trimethylmethoxysilane, add according to the ratio of aluminum-silicon molar ratio of 5, and prepare according to the method for synthesizing aluminum-silicon composite sol in Example 1 ...
Embodiment 3
[0043] Preparation of porous fiber skeleton: immerse 23g of polycrystalline alumina fibers in nitric acid aqueous solution with pH=4, stir to dissolve the slag balls contained in the fibers, then rinse repeatedly with deionized water until neutral, and disperse with 4.2g of epoxy resin Sodium dodecylbenzene sulfonate 1g, BC powder 3g, add to 650ml water together, after dispersing evenly, get the fiber slurry; copy the fiber slurry into the shaping mold, pressurize 0.7KPa, keep the pressure for 2h and then release the mold , to obtain a fiber skeleton with a regular shape, then put it into a muffle furnace, sinter at 1200 ° C for 30 minutes, and take out the porous fiber skeleton after cooling;
[0044] Preparation of composite sol: replace the aluminum sec-butoxide in Example 1 with aluminum nitrate, replace ethyl orthosilicate with trimethylethoxysilane, change the ratio of aluminum-silicon molar ratio to 8, and the rest follow the example 1. The method for synthesizing the a...
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