INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Rapid Preparation of Ultra-high Temperature Ceramics Coating on C/C Composites and Its Ablation Property |
CHEN Yigao*, YAO Xi, WANG Kaijie, WANG Kunjie, ZHANG Guangxi
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Research Institute of Xi’an Aerospace Composites, Xi’an 710025, China |
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Abstract In order to achieve rapid preparation of ultra-high temperature ceramic coating on the surface of C/C composites, the ZrSi2-ZrC-HfC ceramic coating was prepared on C/C composite by slurry brushing method and high-temperature pre-oxidation treatment. The effects of pre-oxidation treatment on microstructure and ablation properties of coating were studied. The results show that the liquid SiO2 phase generated by high-temperature pre-oxidation can fill the internal pores of the coating when compared with the non-preoxidized coating, improving the compactness of coating by bonding ceramic particles and further increasing the anti-ablation property. The coating was tested for 30 s, 60 s and 90 s by oxyacetylene ablation with a heat flux of 3 200 kW/m2. All of the oxide layer remained intact. The SiO2 generated by the pre-oxidation treatment bonds the coating together, preventing the falling off of the coating at the initial stage of ablation. Meanwhile, the SiO2 generated in the ablation process vo-latilizes through heat absorption, reducing the surface temperature and providing thermal protection. The line and mass ablation rates of the coa-ting after ablation for 90 s are 0.837 μm/s and 0.364 mg/s, respectively. The method has the advantages of simple operation and high preparation efficiency. It is suitable for the preparation of different types of ultra-high temperature ceramic coatings on the surface of C/C composites with different structure.
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Published: 25 June 2025
Online: 2025-06-19
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