SiBCN陶瓷具有耐高温，抗氧化等优点，尤其在航空航天领域具有广泛的应用前景。但是材料自身的断裂韧性和抗热震性还不能完全满足使用需求。本项目拟采用多壁碳纳米管增强增韧SiBCN陶瓷。首先，多壁碳纳米管具有优异的力学性能，在改善SiBCN陶瓷的断裂韧性方面具有很好的应用潜力；其次，多壁碳纳米管高的反应活性还有利于形成碳化硅（SiC）和硼氮碳（BN(C)）纳米晶粒，提高材料的力学性能和抗氧化性。本项目首先研究SiBCN陶瓷材料中碳纳米管向SiC以及BN(C)纳米线的结构演变；进而研究各相界面结构，揭示多壁碳纳米管以及纳米SiC和BN(C)陶瓷相的增强增韧机理；最后，采用纳米SiC涂层MWCNTs的方式进一步提高SiBCN陶瓷的抗氧化性，并阐明SiC涂层多壁碳纳米管、纳米SiC晶粒及BN(C)湍层结构的协同抗氧化机理，为制备优异SiBCN陶瓷提供理论与实验指导，具有重要的学术价值和工程应用前景。

SiBCN ceramics have found great potential applications in the area of aeronautics and astronautics due to their excellent thermal resistance and oxidation resistance. However, the brittle failure and low thermal shock resistance have limited their practical applications. In this project, multi-walled carbon nanotubes (MWCNTs) were employed to toughen and strengthen the SiBCN ceramics. Firstly, MWCNTs are good enhancements attribute to their excellent mechanical properties. On the other hand, nanosized SiC and BN(C) can be formed owing to the high reaction activity of MWCNTs, where the SiC and BN(C) could enhance the ceramics and improve the oxidation resistance. The present work will investigate the mechanisms for the structure transformation of MWCNTs into SiC whiskers and BN(C) nanowires. Furthermore, the phases interfacial structure together with strengthening and toughening mechanisms will be considered to reveal the intrinsic relationship between composition, microstructure and properties. Besides, the synergistic antioxidant mechanisms of the nano SiC coated MWCNTs together with SiC and BN(C) will be discussed. All the above works will provide theoretical and technical supports for processing of high performance SiBCN ceramics, which have important academic value and potential engineering application prospects.