文献类型：期刊文献

英文题名：Nano-silica modified lightweight and high-toughness carbon fiber/ phenolic ablator with excellent thermal insulation and ablation performance

作者：Xu, Wenjie[1];Song, Wenda[1];Jia, Xianfeng[2];Ma, Cheng[3];Wang, Jitong[1];Qiao, Wenming[1];Ling, Licheng[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Changzhou Inst Technol, Sch Chem Engn & Mat, Changzhou 213032, Peoples R China;[3]East China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Specially Funct Polymer Mat & Related Tech, Shanghai 200237, Peoples R China

年份：2024

卷号：31

起止页码：192

外文期刊名：DEFENCE TECHNOLOGY

收录：;EI(收录号：20233214496788);WOS:【SCI-EXPANDED(收录号:WOS:001172883800001)】；

基金：Acknowledgements This work was partly supported by the National Natural Science Foundation of China (Grant Nos. 22178107, U21A2060, 22178116) , Xinjiang Uygur Autonomous Region Key Research and Develop- ment Program (Grant No. 2022B01030) and Shanghai Pujiang Program (Grant No. 21PJD019) .

语种：英文

外文关键词：Nano-silica; Carbon fiber; Phenolic aerogel; Insulation; Ablation

摘要：Lightweight and high-toughness carbon fiber/phenolic ablator (CFPA) is required as the Thermal Protection System (TPS) material of aerospace vehicles for next-generation space missions. To improve the ablative properties, silica sol with good particle size distribution prepared using tetramethoxysilane (TMOS) was blended with natural rubber latex and deposited onto carbon fiber felt, which was then integrated with phenolic aerogel matrix, introducing nano-silica into the framework of CFPA. The modified CFPA with a low density of 0.28-0.31 g/cm3 exhibits strain-in-fracture as high as 31.2% and thermal conductivity as low as 0.054 W/(m.K). Furthermore, a trace amount of nano-silica could effectively protect CFPA from erosion of oxidizing atmosphere in different high-temperature environments. The oxyacetylene ablation test of 3000 degrees C for 20 s shows a mass ablation rate of 0.0225 g/s, a linear ablation rate of 0.209 mm/s for the modified CFPA, which are 9.64% and 24.82% lower than the unmodified one. Besides, the long-time butane ablation test of 1200 degrees C for 200 s shows an insignificant recession with mass and linear ablation rate of 0.079 g/s and 0.039 mm/s, 16.84% and 13.33% lower than the unmodified one. Meanwhile, the fixed thermocouple in the test also demonstrates a good thermal insulation performance with a low peak back-face temperature of 207.7 degrees C, 12.25% lower than the unmodified one. Therefore, the nano-silica modified CFPA with excellent overall performance presents promising prospects in high-temperature aerospace applications. (c) 2023 China Ordnance Society. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).