Abstract
An exploratory investigation on the oxidation behavior of polymer derived Si-(B)-C-N ceramic in ambient air was conducted in this paper. The amorphous ceramic was oxidized at 1300 °C for 12 h, and the oxidation products were analyzed by employing XRD, FT-IR and TEM. The experimental results indicate that the amorphous Si-(B)-C-N ceramic undergo a rapid oxidation process, and the oxidation products are divided into two parts: amorphous silica and cristobalite phase silica. The formation mechanism of the oxidation products was analyzed on the basis of characterization results and collected DTA curve in ambient air up to 1100 °C. Furthermore, the oxidation mechanism of the amorphous Si-(B)-C-N ceramics was deduced based on analysis results and thermodynamic consideration.
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