In this study, femtosecond laser assisted-chemical vapor infiltration (LA-CVI) was employed to produce C/SiC composites with 1, 3, and 5 rows of mass transfer channels. The effect of laser machining power on the quality of produced holes was investigated. The results showed that the increase in power yielded complete hole structures. The as-obtained C/SiC composites with different mass transfer channels displayed higher densification degrees with flexural strengths reaching 546 ± 15 MPa for row mass transfer channel of 3. The strengthening mechanism of the composites was linked to the increase in densification and formation of “dense band” during LA-CVI process. Multiphysics finite element simulations of the dense band and density gradient of LA-CVI C/SiC composites revealed C/SiC composites with improved densification and lower porosity due to the formation of “dense band” during LA-CVI process. In sum, LA-CVI method is promising for future preparation of ceramic matrix composites with high densities.

在这项研究中，飞秒激光辅助化学气相渗透（LA-CVI）用于生产具有1、3和5行传质通道的C / SiC复合材料。研究了激光加工功率对所生产孔的质量的影响。结果表明，功率的增加产生了完整的孔结构。所获得的具有不同传质通道的C / SiC复合材料表现出较高的致密化程度，行传质通道为3时弯曲强度达到546±15 MPa。该复合材料的强化机理与致密化的增加和“ LA-CVI过程中的“密集频带”。对LA-CVI C / SiC复合材料的致密谱带和密度梯度的多物理场有限元模拟显示，由于LA-CVI过程中形成了“致密谱带”，C / SiC复合材料具有更高的致密性和更低的孔隙率。总而言之，LA-CVI方法有望用于未来高密度陶瓷基复合材料的制备。