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Preparation method of siboc/silica/high silica fiber thermal insulation composite material
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A high-silica fiber and silica technology, which is applied in the field of composite materials, can solve the problems of low thermal insulation performance and cannot meet the requirements of the thermal protection system of hypersonic aircraft, and achieves improved thermal insulation performance and high temperature resistance performance. Excellent, easy-to-process results
Active Publication Date: 2022-07-29
YANTAI VOCATIONAL COLLEGE
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[0005] In order to solve the problem that the existing traditional heat-resistant materials have low anti-insulation performance and cannot meet the requirements of the hypersonic aircraft thermal protectionsystem, the present invention further proposes a preparation method of SiBOC / silicon dioxide / high silica fiber anti-insulation composite material
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specific Embodiment approach 1
[0021] Embodiment 1: Combining Figure 1 to Figure 5 Illustrating this embodiment, the SiBOC / silica / high silica fiber thermal insulation composite material described in this embodiment is prepared from SiBOC precursor ceramics and silica / high silica fiber material. The SiBOC precursor The ceramic is coated on the outside of the silica / high silica fiber material.
[0022] The molar ratio of B:Si content in the SiBOC precursor described in this embodiment is 0.4:1 to 0.7:1.
specific Embodiment approach 2
[0023] Specific implementation mode 2: Combining Figure 1 to Figure 4 Illustrating this embodiment, the preparation method of the SiBOC / silica / high silica fiber thermal insulation composite material described in this embodiment is carried out according to the following steps:
[0024] Step 1: Weighing methyltriethoxysilane and boric acidpowder according to the molar ratio, then adding boric acidpowder to methyltriethoxysilane, and stirring to obtain precursor suspension A;
[0025] Step 2: In the precursor suspension A, drop a hydrochloric acid catalyst, and stir until the boric acid is completely dissolved to form a precursor solution B;
[0026] Step 3. Put the silica / high silica fiber material into the precursor solution B, and immerse it in a vacuum or negative pressure environment until it is completely soaked to obtain a mixture C;
[0027] Step 4. Move the obtained mixture C into an oven for baking, and make it cross-link, solidify and dry by controlling the tempera...
specific Embodiment approach 3
[0036] Specific implementation three: combination Figure 1 to Figure 5 Illustrating this embodiment, in step 1 of this embodiment, the molar ratio of methyltriethoxysilane to boric acid is 1:0.4-1:1, and the stirring time is 10-20 min. The technical features not disclosed in this embodiment are the same as those in the second embodiment.
[0037] Specific embodiment four: combination Figure 1 to Figure 5 Illustrating this embodiment, in step 2 of this embodiment, the mass ratio of the added hydrochloric acid to methyltriethoxysilane is 1:100-1:99, and the stirring time is 10-20 min. The technical features not disclosed in this embodiment are the same as those in the third embodiment.
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Abstract
A preparation method of SiBOC / silicon dioxide / high silicafiberthermal insulationcomposite material relates to the technical field of composite materials. The invention solves the problem that the existing traditional heat-resistant materials have low anti-heat-insulation performance and cannot meet the requirements of the thermal protectionsystem of the hypersonic aircraft. The composites were prepared from SiBOC precursor ceramics and silica / high silicafiber materials. The preparation method is carried out according to the following steps: weighing methyltriethoxysilane and boric acidpowder according to the molar ratio, and stirring to obtain a precursor suspension A; in the precursor suspension A, dropwise a hydrochloric acid catalyst, Form the precursor solution B; put the silica / high silicafiber material into the precursor solution B until it is completely infiltrated to obtain a mixture C; move the obtained mixture C into an oven for baking, and make it by controlling the temperature. After cross-linking, curing and drying, product D is obtained; product D is put into a cracking furnace for pyrolysis. The present invention is used for the preparation of thermal insulation composite materials.
Description
technical field [0001] The invention relates to the technical field of composite materials, in particular to a preparation method of SiBOC / silicon dioxide / high silica fiberthermal insulationcomposite material. Background technique [0002] With the development of hypersonic vehicles, traditional heat-resistant materials can no longer meet the requirements of thermal protection systems. To solve this problem, scientists are conducting research on ultra-high temperature heat-resistant ceramic materials to meet the needs of new aircraft. Therefore, it is very important to develop a thermal insulation composite material with good oxidation resistance, thermal shock resistance, ablation resistance and shape retention ability. [0003] High silica fiber is a kind of high temperature resistant inorganic fiber special material. With its high temperature resistance and excellent mechanical properties, it has broad application prospects in the field of thermal insulation materials ...
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