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Influence of Si and SiC Coating on the Microstructures and Mechanical Properties of C/C Bolts

High−performance bolts made of carbon/carbon (C/C) composites are necessary for connecting thermally−insulating structural components of aerospace vehicles. To enhance the mechanical properties of the C/C bolt, a new silicon infiltration−modified C/C (C/C−SiC) bolt was developed via vapor silicon in...

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Autores principales: Sun, Guodong, Tan, Zhiqiang, Zhang, Qing, Zhang, Yi, Li, Xuqin, Tian, Qinglai, Tang, Yuxing
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10003981/
https://www.ncbi.nlm.nih.gov/pubmed/36902901
http://dx.doi.org/10.3390/ma16051785
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author Sun, Guodong
Tan, Zhiqiang
Zhang, Qing
Zhang, Yi
Li, Xuqin
Tian, Qinglai
Tang, Yuxing
author_facet Sun, Guodong
Tan, Zhiqiang
Zhang, Qing
Zhang, Yi
Li, Xuqin
Tian, Qinglai
Tang, Yuxing
author_sort Sun, Guodong
collection PubMed
description High−performance bolts made of carbon/carbon (C/C) composites are necessary for connecting thermally−insulating structural components of aerospace vehicles. To enhance the mechanical properties of the C/C bolt, a new silicon infiltration−modified C/C (C/C−SiC) bolt was developed via vapor silicon infiltration. The effects of silicon infiltration on microstructure and mechanical properties were systematically studied. Findings reveal that dense and uniform SiC−Si coating has been formed after silicon infiltration of the C/C bolt, strongly bonding with the C matrix. Under tensile stress, the C/C−SiC bolt undergoes a tensile failure of studs, while the C/C bolt is subject to the pull−out failure of threads. The breaking strength of the former (55.16 MPa) is 26.83% higher than the failure strength of the latter (43.49 MPa). Under double−sided shear stress, both the crushing of threads and the shear failure of studs occur within two bolts. As a result, the shear strength of the former (54.73 MPa) exceeds that of the latter (43.88 MPa) by 24.73%. According to CT and SEM analysis, matrix fracture, fiber debonding, and fiber bridging are the main failure modes. Therefore, a mixed coating formed by silicon infiltration can effectively transfer loads from coating to carbon matrix and carbon fiber, thereby enhancing the load−bearing capacity of C/C bolts.
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spelling pubmed-100039812023-03-11 Influence of Si and SiC Coating on the Microstructures and Mechanical Properties of C/C Bolts Sun, Guodong Tan, Zhiqiang Zhang, Qing Zhang, Yi Li, Xuqin Tian, Qinglai Tang, Yuxing Materials (Basel) Article High−performance bolts made of carbon/carbon (C/C) composites are necessary for connecting thermally−insulating structural components of aerospace vehicles. To enhance the mechanical properties of the C/C bolt, a new silicon infiltration−modified C/C (C/C−SiC) bolt was developed via vapor silicon infiltration. The effects of silicon infiltration on microstructure and mechanical properties were systematically studied. Findings reveal that dense and uniform SiC−Si coating has been formed after silicon infiltration of the C/C bolt, strongly bonding with the C matrix. Under tensile stress, the C/C−SiC bolt undergoes a tensile failure of studs, while the C/C bolt is subject to the pull−out failure of threads. The breaking strength of the former (55.16 MPa) is 26.83% higher than the failure strength of the latter (43.49 MPa). Under double−sided shear stress, both the crushing of threads and the shear failure of studs occur within two bolts. As a result, the shear strength of the former (54.73 MPa) exceeds that of the latter (43.88 MPa) by 24.73%. According to CT and SEM analysis, matrix fracture, fiber debonding, and fiber bridging are the main failure modes. Therefore, a mixed coating formed by silicon infiltration can effectively transfer loads from coating to carbon matrix and carbon fiber, thereby enhancing the load−bearing capacity of C/C bolts. MDPI 2023-02-21 /pmc/articles/PMC10003981/ /pubmed/36902901 http://dx.doi.org/10.3390/ma16051785 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Sun, Guodong
Tan, Zhiqiang
Zhang, Qing
Zhang, Yi
Li, Xuqin
Tian, Qinglai
Tang, Yuxing
Influence of Si and SiC Coating on the Microstructures and Mechanical Properties of C/C Bolts
title Influence of Si and SiC Coating on the Microstructures and Mechanical Properties of C/C Bolts
title_full Influence of Si and SiC Coating on the Microstructures and Mechanical Properties of C/C Bolts
title_fullStr Influence of Si and SiC Coating on the Microstructures and Mechanical Properties of C/C Bolts
title_full_unstemmed Influence of Si and SiC Coating on the Microstructures and Mechanical Properties of C/C Bolts
title_short Influence of Si and SiC Coating on the Microstructures and Mechanical Properties of C/C Bolts
title_sort influence of si and sic coating on the microstructures and mechanical properties of c/c bolts
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10003981/
https://www.ncbi.nlm.nih.gov/pubmed/36902901
http://dx.doi.org/10.3390/ma16051785
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