C/SiC foam skeleton reinforced SiC aerogel composite material and preparation method thereof: Fid-Bau Portal

C/SiC foam skeleton reinforced SiC aerogel composite material and preparation method thereof

YE XINLI / LI SHAN / LUO RUI / CHEN YIJIE / XU PENGYI

The invention relates to the technical field of aerogel composite materials, in particular to a C/SiC foam skeleton reinforced SiC aerogel composite material and a preparation method thereof. Light and high-strength C foam is adopted as a framework material of the aerogel composite material, mechanical modification and enhancement of a C foam framework are achieved through a SiC coating, SiC aerogel is obtained through in-situ forming on the surface of the C/SiC foam framework by combining a sol-gel process with a carbon thermal reduction process, overall forming of the aerogel composite material is achieved, and the strength of the aerogel composite material is improved. According to the invention, a C-foam skeleton is adopted as a matrix, a precursor organic sol solution can enter into pores of the C-foam skeleton through gradient structure design, the proportion of SiC aerogel can be adjusted through porosity, impedance matching characteristics are optimized, surface electromagnetic wave incidence is facilitated, the internal C-foam skeleton is in gradient distribution, dielectric loss attenuation is optimized, incident electromagnetic wave absorption is facilitated, and the performance of the composite material is improved. The wave-absorbing performance of the aerogel composite material is synergistically realized.

本发明涉及气凝胶复合材料技术领域，更具体而言，涉及C/SiC泡沫骨架增强SiC气凝胶复合材料及其制备方法。本发明采用了轻质高强的C泡沫作为气凝胶复合材料的骨架材料，并通过SiC涂层对C泡沫骨架实现了力学改性增强，且SiC气凝胶通过溶胶凝胶工艺结合碳热还原工艺在C/SiC泡沫骨架表面原位成型得到，实现了气凝胶复合材料的整体成型，并通过梯度结构设计，使得前驱体有机溶胶液更能进入到C泡沫骨架孔隙内部，同时通过孔隙率可以调节SiC气凝胶的占比，优化了阻抗匹配特性，利于表面电磁波入射，且内部的C泡沫骨架也呈梯度分布，优化了介电损耗衰减，利于入射电磁波吸收，协同实现了气凝胶复合材料的吸波性能。

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