中文摘要：

从自制的SiO2和SiC涂层／三维碳纤维编织体出发，采用溶胶浸渍-原位分解法得到三维碳纤维编织体／涂层／Al2O3陶瓷复合材料．采用等温氧化失重、XRD、SEM、电子拉伸试验等测试手段研究了涂层对碳纤维编织体抗氧化性、复合材料力学性能的影响及复合材料的强韧化机理．结果表明：涂层可明显提高碳纤雏编织体的抗氧化性能；梯度SiC涂层可明显改善纤维与陶瓷颗粒的界面结合性能，使复合材料的强度、断裂韧性和弹性模量分别增加5～10倍，材料的断裂呈层间紧密的复合断裂；裂纹扩展和断口分析表明，复合材料的强韧化机理为Cf的拔出、桥接和诱导裂纹偏转．

英文摘要：

The sol dipping and in-situ decomposition method was used to prepare 3-D carbon fiber braid/coating/Al2O3 ceramic composite, SiO2, SiC coating/3-D carbon fiber braid as origin. The Influence of coating on oxidation resistance of CF braid, the mechanical properties and fracture mechanism of composite were characterized by isothermal oxidation weigh-lass, XRD, SEM, electronic tensile, etc. The results showed that the oxidation resistance of CF braid could be noticeably improved, and the interfacial bonding properties of fiber with ceramic were markedly improved by gradient coating, the mechanical properties of composites were also greatly improved （5～10 times）, and the fracture model was changed, compared with composite without coating. Pulling-out and bridging of fiber and crack deflection induced by fiber were the fracture mechanism of composites.