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

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)5334-5342
Number of pages9
JournalJournal of the European Ceramic Society
Volume42
Issue number13
DOIs
Publication statusPublished - 2022 Oct

Keywords

  • Fibres
  • Mechanical properties
  • Micropillar compression
  • Oxidation
  • Silicon carbide

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