本项目旨在提高碳/碳复合材料的抗氧化烧蚀性能，满足航天领域超高声速飞行器的应用需求。研究内容包括：从材料化学的角度对抗氧化物质纳米粒子基体改性碳/碳复合材料进行多相组分化学成分设计；研究基体改性碳/碳复合材料的制备原理；研究在材料制备过程中抗氧化物质与碳、氧的高温化学反应机制和物相变化规律；研究抗氧化物质在碳基材料中的扩散行为和对碳石墨化的影响机制；研究在超高温条件下材料中各个组分与分子态氧和非分子态氧的化学反应机制；研究新型复合材料在超高温条件下抗氧化保护层的形成规律，氧在保护层表面交换和在内部传输的行为；分析氧化机理，并建立氧化动力学模型，给出氧化速率与温度和时间的关系式；研究新型复合材料在超高温条件下内部微观结构、界面结构、缺陷的演变规律，及其与材料力学性能、抗氧化性能关系。研究成果对优化抗氧化物质的选择，改进制备方法，提高碳/碳复合材料的抗氧化烧蚀性能具有重要的理论和实际意义。

The aim of this project is improving the oxidation and ablation resistance performance of carbon/carbon composite to meet the needs of the hypersonic aerocraft in the aerospace field..In this project, the study includes: chemical composition design of polyphase components for the antioxidant nanoparticles modified carbon/carbon composite by material chemical theory; the preparation principle of matrix modified carbon/carbon composite; the high temperature chemical reaction mechanism of antioxidant with carbon, oxygen, and the phases transformatiom during the preparation process; diffusion behavior of antioxidant in carbon matrix, and its effection on graphitization of carbon; the chemical reaction mechanism of each component in the new composite with molecular, atomic or ionic oxygen under ultra-high temperature condition; the formation mechanism of antioxidation protective layer, the oxygen exchange behavior on the surface of protective layer, as well as oxygen transfer behavior in the protective layer; analysis of the oxidation mechanism and establishment of the oxidation kinetics model, finally giving the related equations of oxidation rate with temperature and reaction time; the evolution of the inner microstructure, interface structure and defect in the new composite materials under ultra-high temperature condition, and its relationship with the mechanical properties and antioxidation. .The research findings have important theoretical and practical significance on the choice of antioxidants, improvement of the preparation method to increasing oxidation and ablation resistance performance of carbon/carbon composites.