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

Show Author's information Jing WANGLiyang CAOYunhai ZHANGYongsheng LIU( )Hui FANGJie CHEN
Science and Technology on Thermostructural Composites Materials Laboratory, Northwestern Polytechnical University, Xi’an 710072, China

† Jing Wang and Liyang Cao contributed equally to this work.

Abstract

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.

Keywords:

C/SiC, laser assisted-chemical vapor infiltration (LA-CVI), mass transfer channels, laser power, flexural strength
Received: 16 August 2020 Revised: 23 September 2020 Accepted: 26 October 2020 Published: 10 February 2021 Issue date: April 2021
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Publication history
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Publication history

Received: 16 August 2020
Revised: 23 September 2020
Accepted: 26 October 2020
Published: 10 February 2021
Issue date: April 2021

Copyright

© The Author(s) 2020

Acknowledgements

The authors acknowledge the support from the National Natural Science Foundation of China (Nos. 51972269 and 51672217), the Fundamental Research Funds for the Central Universities (No. 3102019ghxm014), and the Creative Research Foundation of the Science and Technology on Thermostructural Composite Materials Laboratory (No. JCKYS2020607001).

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