Long term oxidation of a SiC fiber-bonded composite in air at 1500 °C

The oxidation behavior of the SiC fiber-bonded composite (Tyrannohex™) was investigated at 1500 °C up to 4000 h in air. During heating of the samples, it was observed that an amorphous SiO 2 scale was formed and that bubbles of SiO 2 were generated due to the gaseous products upon oxidation. A large...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2003, Vol.23 (16), p.3125-3134
Main Authors: Otsuka, Akihiko, Matsumura, Yoshikazu, Hosono, Kazuya, Tanaka, Ryohei
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Coatings
Composites
Corrosion protection
Cristobalite
Cross-disciplinary physics: materials science
rheology
CVD coating
Exact sciences and technology
Interfaces
Materials science
Oxidation
Physics
SiC/SiC
Structural ceramics
Surface treatments
Technical ceramics
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Summary:The oxidation behavior of the SiC fiber-bonded composite (Tyrannohex™) was investigated at 1500 °C up to 4000 h in air. During heating of the samples, it was observed that an amorphous SiO 2 scale was formed and that bubbles of SiO 2 were generated due to the gaseous products upon oxidation. A large mass loss was also observed after 4000 h heating in spite of the condition of passive oxidation for SiC. The cause of large mass loss can be explained by destruction of oxidation protective scale due to bursting of the bubbles, and high oxidation rate due to high oxygen mobility in amorphous SiO 2 scale containing aluminum ions. To prevent this accelerated oxidation of the composite, a double-layered coating using a CVD-SiC process was developed. Although the samples coated with CVD-SiC were stable in this oxidation test, the cristobalite peaks observed by XRD suggest also an inherent problem of the SiO 2 scale spalling.
ISSN:0955-2219
1873-619X
DOI:10.1016/S0955-2219(03)00116-X