$Mechanical properties and microstructural fracture behaviors of dry-spun SiC fibers$
Código QR

Mechanical properties and microstructural fracture behaviors of dry-spun SiC fibers

Research and development of SiC/SiC composite materials as structural members of aerospace engines is progressing. In order to manufacture SiC/SiC composites with excellent high-temperature characteristics, the SiC fibers which have high mechanical properties at high temperature are necessary; thus,...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Tatsuya KIMURA, Hinako OZAKI, Michimasa UDA, Yoshio HASEGAWA, Akiko KOSHIZAKA, Atsushi HOSOI, Hiroyuki KAWADA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2019
Materias:	sic fiber dry-spun fiber dry-spinning method tensile strength weibull distribution fracture surface observation crystallinity evaluation Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/4541fda8687742b18eeedac34526e0b6
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:4541fda8687742b18eeedac34526e0b6
record_format	dspace
spelling	oai:doaj.org-article:4541fda8687742b18eeedac34526e0b62021-11-29T05:43:34ZMechanical properties and microstructural fracture behaviors of dry-spun SiC fibers2187-974510.1299/mej.18-00543https://doaj.org/article/4541fda8687742b18eeedac34526e0b62019-03-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/6/3/6_18-00543/_pdf/-char/enhttps://doaj.org/toc/2187-9745Research and development of SiC/SiC composite materials as structural members of aerospace engines is progressing. In order to manufacture SiC/SiC composites with excellent high-temperature characteristics, the SiC fibers which have high mechanical properties at high temperature are necessary; thus, further development of SiC fibers is considered a critical issue. In addition, the development of low-cost SiC fibers is necessary for the practical application of SiC/SiC composites. Here, the low-cost SiC fibers can be fabricated by dry spinning method. In the dry-spinning method, the raw material, Polycarbosilane (PCS) is dissolved in an organic solvent and the solution is spun at room temperature. As high-molecular-weight Polycarbosilane is prepared in advance, the infusible process conventionally required in the melt-spinning method is not required. In this study, to evaluate the differences among dry-spun SiC fibers fabricated under various conditions, monofilament tensile tests were conducted. Examination of the fracture surface and elemental analysis of arbitrary cross-sections were then performed to investigate the effects of the fabrication conditions. The tensile strength results indicated that defects were suppressed by excluding low-molecular-weight components and that heat treatment between 1300°C and 1500°C resulted in the maximum strength. Weibull analysis revealed that the dry-spun fibers exhibited lower tensile strength but smaller variation of fiber strength than that of the melt-spun fiber because the dry-spun fibers were more homogeneous. However, evaluation of the crystallinity indicated that the interference pattern derived from the crystal was unclear in the dry-spun fibers but clear in the melt-spun fiber. Therefore, it was suggested that the dry-spun fibers exhibited lower crystallinity than the melt-spun fiber. In addition, the dry-spun and melt-spun fibers exhibited similar C/Si ratios, whereas a large amount of oxygen was detected on the surface of the dry-spun fiber relative to that on the surface of the melt-spun fiber. Further improvement of the mechanical properties is expected upon increasing the molecular weight of the raw material and improving the microstructure.Tatsuya KIMURAHinako OZAKIMichimasa UDAYoshio HASEGAWAAkiko KOSHIZAKAAtsushi HOSOIHiroyuki KAWADAThe Japan Society of Mechanical Engineersarticlesic fiberdry-spun fiberdry-spinning methodtensile strengthweibull distributionfracture surface observationcrystallinity evaluationMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 6, Iss 3, Pp 18-00543-18-00543 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	sic fiber dry-spun fiber dry-spinning method tensile strength weibull distribution fracture surface observation crystallinity evaluation Mechanical engineering and machinery TJ1-1570
spellingShingle	sic fiber dry-spun fiber dry-spinning method tensile strength weibull distribution fracture surface observation crystallinity evaluation Mechanical engineering and machinery TJ1-1570 Tatsuya KIMURA Hinako OZAKI Michimasa UDA Yoshio HASEGAWA Akiko KOSHIZAKA Atsushi HOSOI Hiroyuki KAWADA Mechanical properties and microstructural fracture behaviors of dry-spun SiC fibers
description	Research and development of SiC/SiC composite materials as structural members of aerospace engines is progressing. In order to manufacture SiC/SiC composites with excellent high-temperature characteristics, the SiC fibers which have high mechanical properties at high temperature are necessary; thus, further development of SiC fibers is considered a critical issue. In addition, the development of low-cost SiC fibers is necessary for the practical application of SiC/SiC composites. Here, the low-cost SiC fibers can be fabricated by dry spinning method. In the dry-spinning method, the raw material, Polycarbosilane (PCS) is dissolved in an organic solvent and the solution is spun at room temperature. As high-molecular-weight Polycarbosilane is prepared in advance, the infusible process conventionally required in the melt-spinning method is not required. In this study, to evaluate the differences among dry-spun SiC fibers fabricated under various conditions, monofilament tensile tests were conducted. Examination of the fracture surface and elemental analysis of arbitrary cross-sections were then performed to investigate the effects of the fabrication conditions. The tensile strength results indicated that defects were suppressed by excluding low-molecular-weight components and that heat treatment between 1300°C and 1500°C resulted in the maximum strength. Weibull analysis revealed that the dry-spun fibers exhibited lower tensile strength but smaller variation of fiber strength than that of the melt-spun fiber because the dry-spun fibers were more homogeneous. However, evaluation of the crystallinity indicated that the interference pattern derived from the crystal was unclear in the dry-spun fibers but clear in the melt-spun fiber. Therefore, it was suggested that the dry-spun fibers exhibited lower crystallinity than the melt-spun fiber. In addition, the dry-spun and melt-spun fibers exhibited similar C/Si ratios, whereas a large amount of oxygen was detected on the surface of the dry-spun fiber relative to that on the surface of the melt-spun fiber. Further improvement of the mechanical properties is expected upon increasing the molecular weight of the raw material and improving the microstructure.
format	article
author	Tatsuya KIMURA Hinako OZAKI Michimasa UDA Yoshio HASEGAWA Akiko KOSHIZAKA Atsushi HOSOI Hiroyuki KAWADA
author_facet	Tatsuya KIMURA Hinako OZAKI Michimasa UDA Yoshio HASEGAWA Akiko KOSHIZAKA Atsushi HOSOI Hiroyuki KAWADA
author_sort	Tatsuya KIMURA
title	Mechanical properties and microstructural fracture behaviors of dry-spun SiC fibers
title_short	Mechanical properties and microstructural fracture behaviors of dry-spun SiC fibers
title_full	Mechanical properties and microstructural fracture behaviors of dry-spun SiC fibers
title_fullStr	Mechanical properties and microstructural fracture behaviors of dry-spun SiC fibers
title_full_unstemmed	Mechanical properties and microstructural fracture behaviors of dry-spun SiC fibers
title_sort	mechanical properties and microstructural fracture behaviors of dry-spun sic fibers
publisher	The Japan Society of Mechanical Engineers
publishDate	2019
url	https://doaj.org/article/4541fda8687742b18eeedac34526e0b6
work_keys_str_mv	AT tatsuyakimura mechanicalpropertiesandmicrostructuralfracturebehaviorsofdryspunsicfibers AT hinakoozaki mechanicalpropertiesandmicrostructuralfracturebehaviorsofdryspunsicfibers AT michimasauda mechanicalpropertiesandmicrostructuralfracturebehaviorsofdryspunsicfibers AT yoshiohasegawa mechanicalpropertiesandmicrostructuralfracturebehaviorsofdryspunsicfibers AT akikokoshizaka mechanicalpropertiesandmicrostructuralfracturebehaviorsofdryspunsicfibers AT atsushihosoi mechanicalpropertiesandmicrostructuralfracturebehaviorsofdryspunsicfibers AT hiroyukikawada mechanicalpropertiesandmicrostructuralfracturebehaviorsofdryspunsicfibers
_version_	1718407639881220096

Mechanical properties and microstructural fracture behaviors of dry-spun SiC fibers

Ejemplares similares