Carbon‐bonded carbon fiber (CBCF) composites are promising lightweight and high efficient thermal insulators to be applied in aerospace area, but their practical applications are usually restricted by the low mechanical performance and poor oxidation resistance. To overcome these drawbacks, many efforts have been made in the fabrication of ceramic coated CBCF composites. However, the densities of these modified composites are usually very high, which would result in the reduction in their thermal insulation performance. Herein, we prepared a CBCF composite with SiC nanowires enhanced interfibrous junctions and SiOC ceramic coated carbon fibers (SiCNWs‐SiOC‐CBCF). Similar to CBCF, the SiCNWs‐SiOC‐CBCF exhibits a low density of 0.35 g/cm³ and an anisotropic and highly porous architecture. The SiCNWs‐SiOC‐CBCF possesses a compressive strength of 3.8 MPa and a compression modulus of 195.7 MPa in the X (or Y) direction, ~26.7% and 150% higher than those of CBCF respectively. It can also suffer from an isothermal treatment in air at 900°C for 120 minutes. The combination of these properties makes the SiCNWs‐SiOC‐CBCF a good candidate for thermal insulator to be applied in extreme conditions.

中文翻译：

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具有SiC纳米线的SiOC改性碳键合碳纤维复合材料增强了纤维间的结合

碳键碳纤维（CBCF）复合材料是希望在航空航天领域中应用的轻质高效的绝热材料，但其实际应用通常受到机械性能低和抗氧化性差的限制。为了克服这些缺点，在制造陶瓷涂覆的CBCF复合材料中已经做出了许多努力。但是，这些改性复合材料的密度通常很高，这将导致其绝热性能下降。在这里，我们准备了一种具有SiC纳米线增强的纤维间结和SiOC陶瓷涂层碳纤维（SiCNWs-SiOC-CBCF）的CBCF复合材料。与CBCF相似，SiCNWs-SiOC-CBCF的密度低至0.35 g / cm ³以及各向异性且高度多孔的架构。SiCNWs-SiOC-CBCF在X（或Y）方向的抗压强度为3.8 MPa，压缩模量为195.7 MPa，分别比CBCF高26.7％和150％。它还可能在900°C的空气中进行120分钟的等温处理。这些特性的结合使SiCNWs-SiOC-CBCF成为在极端条件下应用的绝热材料的理想选择。