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Impedance gradient layered gradient composite aerogel as well as preparation method and application thereof
The invention discloses an impedance gradient layered gradient composite aerogel and a preparation method and application thereof, and belongs to the field of preparation of wave-absorbing materials, the impedance gradient layered gradient composite aerogel is formed by stacking and arranging SiC/Si3N4 composite aerogel with different impedances, the SiC/Si3N4 composite aerogel has a unique three-dimensional network porous structure with a multi-layer non-uniform interface and adjustable pores, wherein the unique three-dimensional network porous structure is formed by mutual lap joint of SiC nanowires and Si3N4 (micro) nanoribbons. The SiC/Si3N4 composite aerogel with different impedances is stacked and arranged to be assembled, aerogel self-bonding assembly is carried out, and the impedance matching of the aerogel is improved by the SiC/Si3N4 composite aerogel with the high impedance outside the SiC/Si3N4 composite aerogel with the high impedance outside the SiC/Si3N4 composite aerogel with the high impedance outside the SiC/Si3N4 composite aerogel with the high impedance outside the aerogel. The SiC/Si3N4 composite aerogel with high attenuation in the inner layer is attenuated to form the impedance gradually-changed layered gradient composite aerogel with impedance matching from high to low, so that electromagnetic waves can be continuously and slowly attenuated layer by layer in a zigzag manner, that is, the electromagnetic waves are limited in the layered aerogel to be dissipated, and the absorption performance of the electromagnetic waves is improved.
本发明公开了一种阻抗渐变层状梯度复合气凝胶及其制备方法和应用，属于吸波材料的制备领域，该阻抗渐变层状梯度复合气凝胶由不同阻抗的SiC/Si3N4复合气凝胶堆叠排列组成，SiC/Si3N4复合气凝胶具有SiC纳米线和Si3N4(微)纳米带相互搭接形成的多层不均匀界面的可调控孔隙的独特三维网络多孔结构。将不同阻抗的SiC/Si3N4复合气凝胶堆叠排列进行组装，进行气凝胶自粘接组装，以外层高阻抗的SiC/Si3N4复合气凝胶提升气凝胶的阻抗匹配。以内层高衰减的SiC/Si3N4复合气凝胶进行衰减，形成阻抗匹配由高到低的阻抗渐变层状梯度复合气凝胶，使电磁波能够以“之”字形的方式被不断缓慢逐层衰减，即将电磁波限制在层状气凝胶的内部被耗散，从而提高电磁波吸收性能。
Impedance gradient layered gradient composite aerogel as well as preparation method and application thereof
The invention discloses an impedance gradient layered gradient composite aerogel and a preparation method and application thereof, and belongs to the field of preparation of wave-absorbing materials, the impedance gradient layered gradient composite aerogel is formed by stacking and arranging SiC/Si3N4 composite aerogel with different impedances, the SiC/Si3N4 composite aerogel has a unique three-dimensional network porous structure with a multi-layer non-uniform interface and adjustable pores, wherein the unique three-dimensional network porous structure is formed by mutual lap joint of SiC nanowires and Si3N4 (micro) nanoribbons. The SiC/Si3N4 composite aerogel with different impedances is stacked and arranged to be assembled, aerogel self-bonding assembly is carried out, and the impedance matching of the aerogel is improved by the SiC/Si3N4 composite aerogel with the high impedance outside the SiC/Si3N4 composite aerogel with the high impedance outside the SiC/Si3N4 composite aerogel with the high impedance outside the SiC/Si3N4 composite aerogel with the high impedance outside the aerogel. The SiC/Si3N4 composite aerogel with high attenuation in the inner layer is attenuated to form the impedance gradually-changed layered gradient composite aerogel with impedance matching from high to low, so that electromagnetic waves can be continuously and slowly attenuated layer by layer in a zigzag manner, that is, the electromagnetic waves are limited in the layered aerogel to be dissipated, and the absorption performance of the electromagnetic waves is improved.
本发明公开了一种阻抗渐变层状梯度复合气凝胶及其制备方法和应用，属于吸波材料的制备领域，该阻抗渐变层状梯度复合气凝胶由不同阻抗的SiC/Si3N4复合气凝胶堆叠排列组成，SiC/Si3N4复合气凝胶具有SiC纳米线和Si3N4(微)纳米带相互搭接形成的多层不均匀界面的可调控孔隙的独特三维网络多孔结构。将不同阻抗的SiC/Si3N4复合气凝胶堆叠排列进行组装，进行气凝胶自粘接组装，以外层高阻抗的SiC/Si3N4复合气凝胶提升气凝胶的阻抗匹配。以内层高衰减的SiC/Si3N4复合气凝胶进行衰减，形成阻抗匹配由高到低的阻抗渐变层状梯度复合气凝胶，使电磁波能够以“之”字形的方式被不断缓慢逐层衰减，即将电磁波限制在层状气凝胶的内部被耗散，从而提高电磁波吸收性能。
Impedance gradient layered gradient composite aerogel as well as preparation method and application thereof
一种阻抗渐变层状梯度复合气凝胶及其制备方法和应用
WANG HONGJIE (author) / WANG LEI (author) / SU LEI (author) / CAI ZHIXIN (author) / PENG KANG (author) / NIU MIN (author) / ZHUANG LEI (author)
2023-06-06
Patent
Electronic Resource
Chinese
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