针对C/C复合材料因性能失调导致的热结构烧蚀破坏，提出以可控结构CeC2纳米线/CNT网络提升力学与抗机械剥蚀能力，高熔点CeC2及CeO2减小热化学侵蚀。项目采用原子层沉积法在纤维表面负载均匀的纳米CeO2层，并以之为基础微波水热合成CeO2纳米线、催化CVI生长CNT及制备CeC2纳米线/CNT-C/C复合材料，揭示CeO2纳米线与CNT的生长机理，优化相关敏感工艺参数，实现二者可控制备及其网络形貌、分布与含量调控。分析纳米网络与界面的演变规律及其对高温力学和烧蚀性能的影响，建立CeC2纳米线/CNT/纤维跨尺度增强与烧蚀模型，针对材料不同部位的断裂与烧蚀损伤机制，优化设计纳米增强网络并控制界面，发挥其协调提升C/C复合材料高温力学与抗烧蚀性能的最大潜能。该研究为预制体内纳米增强网络的可控制备提供了有效途径，有望取得C/C复合材料性能的突破，对加快其于苛刻热力耦合环境下的应用意义重大。

In order to avoid the thermal-structural and ablative damages of C/C composites caused by the imbalance between mechanical and ablation properties, a novel ideal is advanced basing on our previous studies. The ideal includes that CeC2 nanofilament/CNT network with controllable microstructure is used to improve the high-temperature mechanical properties and mechanical denudation resistance; the high melting point phases of CeC2 and CeO2 layer formed from CeC2 oxidation are employed to alleviate the thermal-chemical corrosion of C/C composites. In this study, nano-scaled CeO2 layer is firstly prepared on fiber surfaces via atomic layer deposition technique. CeO2 nanofilaments are synthesized by microwave-hydrothermal method with the help of the nano-scaled CeO2 layer. Subsequently, the growth of CNTs and production of CeC2 nanofilament/CNT-C/C composites are fabricated by catalytic chemical vapor infiltration using CeO2 nanofilaments as catalysts. The growth mechanisms of CeO2 nanofilament and CNT are revealed via various methods. With the help of growth mechanisms, the growth of CeO2 nanofilament and CNT are controlled via optimizing the sensitive processing parameters, which favors the morphology, distribution and content tailors of the formed CeC2 nanofilament/CNT reinforcing networt. The structural evolution of the reinforcing network and multi-interfaces are analyzed, which is used to study their effect on the high-temperature mechanical and ablation properties. The multi-scaled reinforcing and ablation models are also established to reveal the function of nanofilament/CNT/carbon fiber on the mechanical and ablation properties. According to the fracture and ablation mechanisms of C/C composites, the reinforcing network is designed and optimized in different structures including the fiber/matrix interface and matrix. In addition to the control of multi-interfaces, the maximum function of the reinforcing network is exploited to improve the high-temperature mechanical and ablation properties of C/C composites. Moreover, the item develops an effective method for the controllable preparation of CeC2 nanofilament/CNT network in carbon fiber preform, which contributes to a great improvement of the properties of C/C composites. This is very meaningful for prompting the application of CeC2 nanofilament/CNT network reinforced C/C composites in the environment with high temperature and complicated stress.