Thermal properties, oxidation corrosion behavior, and the in situ ceramization mechanism of SiB6@BPR/HF composites under high-temperature corrosion

Pyrolytic carbon generated by phenolic resin at high temperatures is easily oxidized. In this paper, SiB6 @BPR/HF composites were prepared, and their thermal properties, oxidation behavior, and the in situ ceramic mechanism under high-temperature corrosion were studied. The results show that the linear ablation rates of SiB6 @BPR/HF composites can reach 7.5 µm/s, and the mass residual rate can reach 95.5% when the SiB6 content is 50%. Additionally, XRD and XPS analyses showed that there was a complex in situ ceramization reaction to form Si-B-C-O ceramics which prevented the corrosion of composites under an aerobic high-temperature environment of about 1800–1900 °C.