In this study, C_f/SiC composite was modified with SiC nanowires (SiC_nws) grown in-situ in SiC matrix. Effects of SiC_nw on bending strength and fracture toughness were investigated by comparison with conventional C_f/SiC. Results showed that SiC_nw significantly improved both strength and fracture toughness of C_f/SiC. Compared to C_f/SiC, flexural strengths of C_f/SiC-SiC_nw/PyC and C_f/SiC-SiC_nw composites increased from 363.1 MPa to 375 MPa and 466.9 MPa, respectively. Bending strength and fracture toughness were estimated to 565 MPa and 20.30 MPa m^1/2 for C_f/SiC containing SiC_nw at high temperature (1000 °C), respectively. These values were 13.2% and 16.1% higher than that of conventional C_f/SiC. The latter was attributed to deflection, bridging, and pull-out of SiC nanowires to cracks. Improvements in mechanical properties of modified C/SiC composites were mainly attributed to deflection and bridging of SiC nanowires on cracks and pulling out of SiC nanowires from the matrix.

在这项研究中，用SiC基体中原位生长的SiC纳米线（SiC _nws）改性了C _f / SiC复合材料。通过与常规C _f / SiC的比较，研究了SiC _nw对弯曲强度和断裂韧性的影响。结果表明，SiC _nw显着提高了C _f / SiC的强度和断裂韧性。与C _f / SiC相比，C _f / SiC-SiC _nw / PyC和C _f / SiC-SiC _nw复合材料的抗弯强度分别从363.1 MPa增加到375 MPa和466.9 MPa。弯曲强度和断裂韧性估计为565 MPa和20.30 MPa m在高温（1000°C）下分别为C _f / SiC含SiC _nw的^1/2。这些值比常规的C _f / SiC分别高13.2％和16.1％。后者归因于SiC纳米线的挠曲，桥接和拉出到裂缝。改性C / SiC复合材料力学性能的提高主要归因于SiC纳米线在裂纹上的挠曲和桥接以及从基体中拉出SiC纳米线。