Irradiation-induced shrinkage of highly crystalline SiC fibers

Sosuke Kondo; Tatsuya Hinoki; Makoto Nonaka; Kazumi Ozawa

doi:10.1016/j.actamat.2014.07.057

Irradiation-induced shrinkage of highly crystalline SiC fibers

Sosuke Kondo, Tatsuya Hinoki, Makoto Nonaka, Kazumi Ozawa

IMR - Materials Design Division

Research output: Contribution to journal › Article › peer-review

39 Citations (Scopus)

Abstract

Composites consisting of a SiC matrix prepared by chemical vapor infiltration that was reinforced by Tyranno™ SA^3rd (TSA3) or Hi-Nicalon™ Type S (HNLS) SiC fibers were irradiated with 5.1 MeV Si ions to 100 dpa at 300 °C. It was confirmed that the irradiated microstructure of TSA3 was stable up to 100 dpa. In contrast, the results of surface profilometry and cross-sectional transmission electron microscopy (TEM) showed that HNLS fibers underwent 0.8% shrinkage along the axis and 0.7% radial shrinkage. High-resolution TEM images of the highly damaged regions in the HNLS material revealed the complete loss of carbon ribbons initially distributed at the SiC grain boundaries. Ion-beam-induced diffusion of carbon into the SiC grains was indicated from the observations of the interdiffusion layer formed at the fiber/pyrocarbon interface.

Original language	English
Pages (from-to)	1-9
Number of pages	9
Journal	Acta Materialia
Volume	83
DOIs	https://doi.org/10.1016/j.actamat.2014.07.057
Publication status	Published - 2015 Jan 15

Keywords

Irradiation effect
Microstructure
SiC fibers
SiC/SiC composites

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10.1016/j.actamat.2014.07.057

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title = "Irradiation-induced shrinkage of highly crystalline SiC fibers",

abstract = "Composites consisting of a SiC matrix prepared by chemical vapor infiltration that was reinforced by Tyranno{\texttrademark} SA3rd (TSA3) or Hi-Nicalon{\texttrademark} Type S (HNLS) SiC fibers were irradiated with 5.1 MeV Si ions to 100 dpa at 300 °C. It was confirmed that the irradiated microstructure of TSA3 was stable up to 100 dpa. In contrast, the results of surface profilometry and cross-sectional transmission electron microscopy (TEM) showed that HNLS fibers underwent 0.8% shrinkage along the axis and 0.7% radial shrinkage. High-resolution TEM images of the highly damaged regions in the HNLS material revealed the complete loss of carbon ribbons initially distributed at the SiC grain boundaries. Ion-beam-induced diffusion of carbon into the SiC grains was indicated from the observations of the interdiffusion layer formed at the fiber/pyrocarbon interface.",

keywords = "Irradiation effect, Microstructure, SiC fibers, SiC/SiC composites",

author = "Sosuke Kondo and Tatsuya Hinoki and Makoto Nonaka and Kazumi Ozawa",

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AU - Kondo, Sosuke

AU - Hinoki, Tatsuya

AU - Nonaka, Makoto

AU - Ozawa, Kazumi

PY - 2015/1/15

Y1 - 2015/1/15

N2 - Composites consisting of a SiC matrix prepared by chemical vapor infiltration that was reinforced by Tyranno™ SA3rd (TSA3) or Hi-Nicalon™ Type S (HNLS) SiC fibers were irradiated with 5.1 MeV Si ions to 100 dpa at 300 °C. It was confirmed that the irradiated microstructure of TSA3 was stable up to 100 dpa. In contrast, the results of surface profilometry and cross-sectional transmission electron microscopy (TEM) showed that HNLS fibers underwent 0.8% shrinkage along the axis and 0.7% radial shrinkage. High-resolution TEM images of the highly damaged regions in the HNLS material revealed the complete loss of carbon ribbons initially distributed at the SiC grain boundaries. Ion-beam-induced diffusion of carbon into the SiC grains was indicated from the observations of the interdiffusion layer formed at the fiber/pyrocarbon interface.

AB - Composites consisting of a SiC matrix prepared by chemical vapor infiltration that was reinforced by Tyranno™ SA3rd (TSA3) or Hi-Nicalon™ Type S (HNLS) SiC fibers were irradiated with 5.1 MeV Si ions to 100 dpa at 300 °C. It was confirmed that the irradiated microstructure of TSA3 was stable up to 100 dpa. In contrast, the results of surface profilometry and cross-sectional transmission electron microscopy (TEM) showed that HNLS fibers underwent 0.8% shrinkage along the axis and 0.7% radial shrinkage. High-resolution TEM images of the highly damaged regions in the HNLS material revealed the complete loss of carbon ribbons initially distributed at the SiC grain boundaries. Ion-beam-induced diffusion of carbon into the SiC grains was indicated from the observations of the interdiffusion layer formed at the fiber/pyrocarbon interface.

KW - Irradiation effect

KW - Microstructure

KW - SiC fibers

KW - SiC/SiC composites

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ER -

Irradiation-induced shrinkage of highly crystalline SiC fibers

Abstract

Keywords

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