التفاصيل البيبلوغرافية
| العنوان: |
Pore defects repair of CCF/SiC composites fabricated by additive manufacturing. |
| المؤلفون: |
Liu, Tianlong1 (AUTHOR), Xiong, Lijun1,2 (AUTHOR), Chen, Zhaofeng1 (AUTHOR) czf_msc@nuaa.edu.cn, Lu, Le1 (AUTHOR), Li, Manna1 (AUTHOR), Ma, Zhudan1 (AUTHOR), Yang, Lixia1 (AUTHOR) lixiayang@nuaa.edu.cn, Wu, Guoping2 (AUTHOR), Xing, Yuming3 (AUTHOR), Wang, Xingpu3 (AUTHOR), Sun, Ce4 (AUTHOR), Liu, Kai4 (AUTHOR) |
| المصدر: |
Ceramics International. Jul2024:Part B, Vol. 50 Issue 13, p24358-24367. 10p. |
| مصطلحات موضوعية: |
*MELT infiltration, *CHEMICAL vapor deposition, *SILICON nanowires, *FRACTURE toughness, *BENDING strength, *SILICON carbide |
| مستخلص: |
This work presents the pore defects repair of additively manufactured chopped carbon fibre reinforced silicon carbide (CCF/SiC) composites using a combination of chemical vapour deposition (with methyltrichlorosilane and hydrogen as the precursor material) and reactive melt infiltration. The in-situ generation of silicon carbide nanowires (SiC nws) in the CCF/SiC composites significantly reduced the initial pore defects size, while the secondary SiC and free Si filled and closed the pore defects. The X-CT shows that the CCF/SiC composite after pore defects repair was internally dense and no significant pore geometry was observed. The incorporation of micron-sized CCF and nano-sized SiC nws as reinforcing phases resulted in a synergistic toughening effect. Specifically, the CCF enhances toughness through fibre debonding and pull-out mechanisms, while the SiC nws contribute to toughening through nanowire bridging and pull-out mechanisms. This dual toughening mechanism significantly improved bending strength from 210.7 to 274.5 MPa and elevated the fracture toughness from 3.2 to 3.6 MPa m1/2. Another notable advantage of the SiC nws is their ability to form a space network and reduce the thermal expansion coefficient. Consequently, this novel microstructural pore defects repair approach further enhanced the overall performance and reliability of the CCF/SiC composites based on additive manufacturing. This innovative approach holds great promise for the development of high-performance complex-structure CCF/SiC composites with wide-ranging applications across various industries. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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