航空航天的快速发展对C/C复合材料在高温高速燃气冲刷等极端服役环境下的性能提出了更高要求。本项目提出将兼具优良力学性能和高温稳定性的HfC纳米线引入C/C复合材料中，开发一种一维超高温陶瓷纳米材料改性的C/C复合材料，旨在解决普通陶瓷颗粒改性C/C复合材料存在力学性能损伤的难题，实现力学与抗烧蚀性能的同步提高。拟研究HfC纳米线的低压化学气相沉积（LPCVD）工艺、微结构及生长机理，实现其在炭布上均匀可控生长；将预沉积有HfC纳米线的炭布叠层穿刺后利用化学气相渗透工艺制得HfC纳米线改性C/C复合材料，研究HfC纳米线对热解炭沉积过程与结构、界面结构的影响机制，阐明该复合材料的制备工艺规律；探讨HfC纳米线改性C/C复合材料的力学与烧蚀行为，揭示其增韧机制与抗烧蚀机理，建立烧蚀理论模型。此项目有望为兼具优良力学和抗烧蚀性能的HfC纳米线改性C/C复合材料的制备与航空航天应用奠定理论基础。

With the rapid development of aerospace industry, properties of C/C composites in extreme service environments with high-temperature and high-speed gas flow need to be further improved to meet higher requirements. In this project, HfC nanowires with excellent mechanical properties and good high-temperature stability will be introduced into matrix to develop C/C composites modified one-dimensional high-temperature ceramic nanomaterials. The objective of this project is to improve synchronously mechanical properties and the ablation resistance of C/C composites by solving a key issue about the compromising mechanical properties of C/C composites modified by common ceramic particles. Preparation, microstructures and growth mechanism of HfC nanowires via low-pressure chemical vapor deposition (LPCVD) will be investigated to achieve uniform and controllable growth of HfC nanowires on the surface of carbon cloth. The laminated carbon cloth with HfC nanowires will be needled with carbon fibers, which is used as perform for chemical vapor infiltration (CVI) preparation of HfC nanowire modified C/C composites. The effects of HfC nanowires on deposition and microstructures of pyrolytic carbon, and interface structures will be studied, and technology principles of preparing HfC nanowire modified C/C composites will be proposed. Mechanical and ablation behavior of HfC nanowire modified C/C composites will be analyzed and discussed to reveal the toughening and anti-ablation mechanisms, contributing to the building of the ablation model. The accomplishment of this project will provide foundational theory support for fabrication and application of HfC nanowire modified C/C composites with excellent mechanical and anti-ablation properties in the aerospace field .