文献类型：期刊文献

英文题名：Low-Interfacial-Defect Carbon Aerogel/Carbon Fiber Composites with In situ Repair-Induced Ultrahigh Compressive Strength for High-Temperature Insulation and Structural Applications

作者：Li, Liang[1,2];Cai, Hongxiang[1];Wang, Peng[1];Yang, Peiqi[1];Su, Zhe[3];Luo, Yi[3];Liang, Xiubing[2];Niu, Bo[1,3];Wang, Xiaojing[2];Long, Donghui[1,3]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Natl Innovat Inst Def Technol, Adv Interdisciplinary Technol Res Ctr, Beijing 100071, Peoples R China;[3]Suzhou Lab, Struct Mat Res Dept, Suzhou 215000, Peoples R China

年份：2025

卷号：17

期号：39

起止页码：55423

外文期刊名：ACS APPLIED MATERIALS & INTERFACES

收录：;EI(收录号：20254019273736);WOS:【SCI-EXPANDED(收录号:WOS:001574987300001)】；

基金：This work was supported by the National Natural Science Foundation of China (Nos. 52472095 and U2341291).

语种：英文

外文关键词：carbon aerogel; low interfacial defect; insitu repair; X-ray micro computed tomography; highmechanical strength; high-temperature insulation

摘要：Although carbon aerogel/carbon fiber composites (CACFs) exhibit excellent thermal stability and high-temperature insulating capacity, their compressive strength remains limited because of interfacial defects arising from mismatched carbonization-induced shrinkage between fibers and matrix. Herein, we developed robust CACFs (RCACFs) with ultralow interfacial defects using an in situ repair route to simultaneously meet the demands of high-temperature insulation and structural integrity. X-ray micro computed tomography (micro-CT) revealed that the repair process reduced the interfacial defects (>9.73 mu m(3)) from 22.4 to 4.6%. The repaired composite (0.75 gcm(-3)) achieved a compressive strength of 14.3 MPa at a 5% strain, a 180.4% improvement over that of untreated CACFs (5.1 MPa, 0.73 gcm(-3)). During high-temperature tensile testing at 1200 degrees C, in situ micro-CT confirmed the excellent thermal mechanical stability of RCACFs, which retained stable small voids (<0.5 x 10(2) mm(3)) and effectively suppressed defect expansion during loading. The as-prepared RCACFs maintained a low thermal conductivity of 0.173 Wm(-1)K-1 at 25 degrees C and 0.901 Wm(-1)K-1 at 1200 degrees C, exhibited negligible volumetric shrinkage at 1600 degrees C, and demonstrated superior ablation resistance with a linear ablation rate of 1.3 mu ms(-1) under an oxyacetylene flame at 1800 degrees C. These results position RCACFs as promising materials for high-temperature insulation and load-bearing applications in extreme environments.