Abstract To improve the thermal insulation and mechanical properties of lightweight carbon- bonded carbon fiber composites (CBCF), a porous CBCF decorated with nano SiO2-Al2O3 aerogel was prepared by sol-gel impregnation. Results showed that the nano aerogel were uniformly assembled within the pores in the CBCF framework. The aerogel played a significant role on reducing the thermal conductivity of CBCF, which could be mainly ascribed to reduced radiation and gas thermal conductivity of CBCF. Moreover, the aerogel in the CBCF pores hindered the bending fracture or elastic bending/rotation of the fibers and enhanced the mechanical properties of the composites.

中文翻译：

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SiO 2 -Al 2 O 3 气凝胶浸渍多孔碳结合碳纤维复合材料，具有增强的隔热和机械性能

摘要 为了提高轻质碳键碳纤维复合材料（CBCF）的隔热性能和力学性能，采用溶胶-凝胶浸渍法制备了纳米SiO2-Al2O3气凝胶装饰的多孔CBCF。结果表明，纳米气凝胶均匀地组装在 CBCF 框架的孔隙内。气凝胶对降低CBCF的热导率起到了显着的作用，这主要归因于CBCF的辐射热导率和气体热导率的降低。此外，CBCF孔中的气凝胶阻碍了纤维的弯曲断裂或弹性弯曲/旋转，提高了复合材料的机械性能。