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Carbon-silicon carbide nanofiber aerogel as well as preparation method and application thereof
The invention relates to carbon-coated silicon carbide nanofiber aerogel as well as a preparation method and application thereof, and belongs to the technical field of nanofiber aerogel. In order to solve the technical problems that in the prior art, silicon carbide nanofiber aerogel is poor in heat insulation and mechanical properties and cannot be considered at the same time, according to the carbon-coated silicon carbide nanofiber aerogel, plasma is adopted for cleaning graphite felt, and a layer of additional carbon source is coated outside graphite fibers, so that the carbon-coated silicon carbide nanofiber aerogel is obtained; and soaking the amorphous carbon-coated graphite in a mixed solution of tetraethyl orthosilicate, ethanol and deionized water, and calcining at a high temperature to prepare the amorphous carbon-coated graphite carbon partial sacrifice converted carbon-coated silicon carbide aerogel. The silicon carbide shell is resistant to oxidation and ablation, a large number of silicon carbide nanowires are filled among the carbon-coated silicon carbide fibers, the unique three-dimensional porous structure enables the material to have heat insulation performance in an aerobic environment, and the core carbon fiber skeleton endows the material with super-strong mechanical properties. The invention further provides a preparation method of the silicon carbide nanofiber aerogel, and large-scale production can be achieved.
本发明涉及碳@碳化硅纳米纤维气凝胶及其制备方法和应用，属于纳米纤维气凝胶技术领域。针对现有技术中的碳化硅纳米纤维气凝胶，隔热和力学性能不佳，通常不能兼顾的技术问题，本申请提供的碳@碳化硅纳米纤维气凝胶，采用等离子清洗石墨毡，并在石墨纤维外包覆一层额外碳源，浸渍于正硅酸四乙酯、乙醇和去离子水的混合溶液中，高温下煅烧，制得无定形碳包覆石墨碳部分牺牲转化的碳@碳化硅气凝胶。碳化硅外壳抗氧化且耐烧蚀，碳@碳化硅纤维间还充斥着大量碳化硅纳米线，独特的三维多孔结构使得该材料在有氧环境下具备隔热性能，芯部碳纤维骨架赋予了该材料超强的力学特性。本申请还提供了碳化硅纳米纤维气凝胶的制备方法，可以实现规模化生产。
Carbon-silicon carbide nanofiber aerogel as well as preparation method and application thereof
The invention relates to carbon-coated silicon carbide nanofiber aerogel as well as a preparation method and application thereof, and belongs to the technical field of nanofiber aerogel. In order to solve the technical problems that in the prior art, silicon carbide nanofiber aerogel is poor in heat insulation and mechanical properties and cannot be considered at the same time, according to the carbon-coated silicon carbide nanofiber aerogel, plasma is adopted for cleaning graphite felt, and a layer of additional carbon source is coated outside graphite fibers, so that the carbon-coated silicon carbide nanofiber aerogel is obtained; and soaking the amorphous carbon-coated graphite in a mixed solution of tetraethyl orthosilicate, ethanol and deionized water, and calcining at a high temperature to prepare the amorphous carbon-coated graphite carbon partial sacrifice converted carbon-coated silicon carbide aerogel. The silicon carbide shell is resistant to oxidation and ablation, a large number of silicon carbide nanowires are filled among the carbon-coated silicon carbide fibers, the unique three-dimensional porous structure enables the material to have heat insulation performance in an aerobic environment, and the core carbon fiber skeleton endows the material with super-strong mechanical properties. The invention further provides a preparation method of the silicon carbide nanofiber aerogel, and large-scale production can be achieved.
本发明涉及碳@碳化硅纳米纤维气凝胶及其制备方法和应用，属于纳米纤维气凝胶技术领域。针对现有技术中的碳化硅纳米纤维气凝胶，隔热和力学性能不佳，通常不能兼顾的技术问题，本申请提供的碳@碳化硅纳米纤维气凝胶，采用等离子清洗石墨毡，并在石墨纤维外包覆一层额外碳源，浸渍于正硅酸四乙酯、乙醇和去离子水的混合溶液中，高温下煅烧，制得无定形碳包覆石墨碳部分牺牲转化的碳@碳化硅气凝胶。碳化硅外壳抗氧化且耐烧蚀，碳@碳化硅纤维间还充斥着大量碳化硅纳米线，独特的三维多孔结构使得该材料在有氧环境下具备隔热性能，芯部碳纤维骨架赋予了该材料超强的力学特性。本申请还提供了碳化硅纳米纤维气凝胶的制备方法，可以实现规模化生产。
Carbon-silicon carbide nanofiber aerogel as well as preparation method and application thereof
碳@碳化硅纳米纤维气凝胶及其制备方法和应用
HU XIAOYE (author) / ZHENG CHUNXUE (author) / LI XINYANG (author) / YU JIE (author) / HUANG ZHULIN (author) / LI MING (author)
2024-05-14
Patent
Electronic Resource
Chinese
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