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Effect of mass transfer channels on flexural strength of C/SiC composites fabricated by femtosecond laser assisted CVI method with optimized laser power

Jing WANG  Liyang CAO  Yunhai ZHANG  Yongsheng LIU  Hui FANG  Jie CHEN  
【摘要】: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.

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