Abstract
The oxidation behavior and thermal stability of Si-C fibers (Hi-Nicalon) in CO-CO2 gas mixtures were investigated at 1773 K, through mass change determination, XRD analysis, resistivity measurement, SEM observation and tensile test. Mass gain and cristobalite formation were observed at $$p_{CO_2 } $$ ≧ 2 × 103 Pa, showing the occurrence of passive-oxidation of the fibers. The active-oxidation, which was characterized by the mass loss, involved the formation of carbon film at $$p_{CO_2 } $$ ≦ 5 × 102 Pa. 65–90% of the strength in the as-received state was retained after the active-oxidation at $$p_{CO_2 } $$ ≦ 102 Pa and after the passive-oxidation at $$p_{CO_2 } $$ ≧ 5 × 104 Pa. Surface imperfections produced very large decrease in tensile strength in the CO2 partial pressure range of 5×102 to 104 Pa.
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