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The invention discloses a high-temperature-resistant silicon-based ceramic-based aerogel and a preparation method thereof. The preparation method comprises the following steps: adding ethyltrimethoxysilane, n-silyl isopropyl ester and a solvent absolute ethyl alcohol into a reaction kettle for mixing and dissolving, mixing absolute ethyl alcohol and deionized water, adding the mixture into the reaction kettle, and uniformly mixing to obtain a product A; spraying or dipping the product A onto flexible ceramic fibers; tube bundle slippage caused by Van der Waals' force interaction exists in the carbon nanotube bundle in the breaking process, when the carbon nanotube is subjected to pulling force, C atoms at the atom defect position or the inner junction position in the carbon nanotube are in a dynamic active state to form a breaking critical point, and the C atoms at the critical point can be subjected to C atom rearrangement, hexagonal connection is changed into pentagonal or heptagonal connection to absorb energy to resist fracture, the root of the tube bundle exists in a three-dimensional structure, and the purpose of improving toughness is achieved by adding the toughening aid.
本发明公开了一种耐高温硅基陶瓷基气凝胶及其制备方法，通过将乙基三甲氧基硅烷、正硅基异丙酯和溶剂无水乙醇加入到反应釜中进行混溶，将无水乙醇和去离子水混合加入反应釜，混合均匀，得到产物A，将产物A喷涂或浸渍到柔性陶瓷纤维上；拉断过程存在碳纳米管束内由范德华力相互作用的管束滑移，碳纳米管经受拉力时，碳纳米管内原子缺陷处或内结处C原子处于动力学活跃状态形成断裂临界点，临界点上的C原子会进行C原子重排，由六边形连接变为五边形或七边形连接来吸收能量抵抗断裂，管束根部以三维结构存在，通过添加该增韧助剂从而达到增加韧性的目的。
The invention discloses a high-temperature-resistant silicon-based ceramic-based aerogel and a preparation method thereof. The preparation method comprises the following steps: adding ethyltrimethoxysilane, n-silyl isopropyl ester and a solvent absolute ethyl alcohol into a reaction kettle for mixing and dissolving, mixing absolute ethyl alcohol and deionized water, adding the mixture into the reaction kettle, and uniformly mixing to obtain a product A; spraying or dipping the product A onto flexible ceramic fibers; tube bundle slippage caused by Van der Waals' force interaction exists in the carbon nanotube bundle in the breaking process, when the carbon nanotube is subjected to pulling force, C atoms at the atom defect position or the inner junction position in the carbon nanotube are in a dynamic active state to form a breaking critical point, and the C atoms at the critical point can be subjected to C atom rearrangement, hexagonal connection is changed into pentagonal or heptagonal connection to absorb energy to resist fracture, the root of the tube bundle exists in a three-dimensional structure, and the purpose of improving toughness is achieved by adding the toughening aid.
本发明公开了一种耐高温硅基陶瓷基气凝胶及其制备方法，通过将乙基三甲氧基硅烷、正硅基异丙酯和溶剂无水乙醇加入到反应釜中进行混溶，将无水乙醇和去离子水混合加入反应釜，混合均匀，得到产物A，将产物A喷涂或浸渍到柔性陶瓷纤维上；拉断过程存在碳纳米管束内由范德华力相互作用的管束滑移，碳纳米管经受拉力时，碳纳米管内原子缺陷处或内结处C原子处于动力学活跃状态形成断裂临界点，临界点上的C原子会进行C原子重排，由六边形连接变为五边形或七边形连接来吸收能量抵抗断裂，管束根部以三维结构存在，通过添加该增韧助剂从而达到增加韧性的目的。
High-temperature-resistant silicon-based ceramic-based aerogel and preparation method thereof
一种耐高温硅基陶瓷基气凝胶及其制备方法
2021-09-07
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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