4.7 Article

Comparative ablation behaviors of C/SiC-ZrC and C/SiC-HfC composites prepared by ceramization of carbon aerogel preforms

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CORROSION SCIENCE
卷 225, 期 -, 页码 -

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PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2023.111623

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Ceramic matrix composites; Carbon aerogel; Reactive melt infiltration; Ablation behavior

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The ablation behaviors of C/SiC-ZrC and C/SiC-HfC composites were investigated, revealing differences in the ablation rates and the impact of the formed oxide products on the ablation resistance at different temperatures.
Novel carbon aerogels were used as matrix precursors to fabricate C/SiC-ZrC and C/SiC-HfC composites through their reactions with molten ZrSi2 and HfSi2, respectively. The ablation behaviors of the two composites were investigated comparatively. The C/SiC-ZrC has a lower linear ablation rate at 2200 degrees C but a higher value at 2500 degrees C. It can be attributed to the milder exfoliation of the formed SiO2-ZrO2 with more glass phase than SiO2-HfO2 at 2200 degrees C. However, the solid HfO2 skeleton formed on the ablation surface has superior anti-peeling capability than ZrO2 at 2500 degrees C.

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