通过在碳化硅纤维表面原位生长纳米线得到具有多级增强结构的碳化硅复合材料,对复合材料引入纳米线后的微观结构、弯曲强度以及损伤的变化过程进行了研究.研究结果表明,相较于原始的碳化硅纤维增强碳化硅复合材料,碳化硅纳米线可以明显提高基体沉积效率并改善材料的弯曲力学性能.从声发射技术和维氏硬度压痕测试结果可以看出,纳米线通过抑制微裂纹的产生和在微裂纹之间发生桥联来抑制早期损伤的发展.此外,在纳米线表面沉积一层氮化硼界面相,纳米线与基体之间的结合力变弱,复合材料对微裂纹的抑制和偏转得到进一步增强,弯曲性能大幅提升.“,”SiC fiber (SiCf)/SiC composites were modified by SiC nanowires (SiCnw) grown in-situ on SiC fiber to obtain hierarchical structure. Effects of this hierarchical structure on the properties of composites, such as microstructure, fracture strength and damage evolution, were evaluated. Results show that the introduction of SiCnw significantly improves the matrix infiltration efficiency. SiCnw and BN-coated SiCnw reinforced SiCf/SiC composites acquire better performance in bending tests by comparison with conventional SiCf/SiC. SiCnw coated by BN interphase obviously enhances the strength owing to weak-bonded interface. Besides, results of acoustic emission and Coated Vickers Hardness Impresses reveal that SiCnw delay early damage evolution at early state and mainly make contribution to hindering and bridging of microcracks, which is further enhanced by BN-coated SiCnw.