Compressive strength degradation of SiC fibers exposed to high temperatures due to impurity-induced internal oxidation

Xinwei Yuan, Sosuke Kondo, Kazuya Shimoda, Hao Yu, Yasuki Okuno, Ryuta Kasada

研究成果: ジャーナルへの寄稿学術論文査読

4 被引用数 (Scopus)

抄録

SiC fiber oxidation is a potential factor limiting the operating temperature of SiCf/SiC composites owing to the strength degradation after oxidation. Herein, we fabricated 1-μm-diameter pillars at the core of the fiber cross-sectional surface after SiO2 removal to eliminate surface effects caused by external oxidation. The fiber strength significantly decreased during the first hour of oxidation in dried air at 1400 °C, but this deterioration became less pronounced after 10 h. Simultaneously, the oxidation lowered the Young's modulus and Weibull modulus. Oxidation considerably increased the porosity and the alterations in the mechanical behavior were primarily caused by the variations in porosity. Oxidation-induced pores were frequently detected at the fiber core and were partially filled with SiO2. Compared with those of the as-received fibers, O impurities in the oxidized fiber core were significantly reduced. Thus, the fiber strength was potentially degraded by the internal oxidation reaction between residual C and O.

本文言語英語
ページ(範囲)5334-5342
ページ数9
ジャーナルJournal of the European Ceramic Society
42
13
DOI
出版ステータス出版済み - 2022 10月

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