期刊
CORROSION SCIENCE
卷 190, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2021.109638
关键词
C; C composites; Oxidation resistance; Ablation behavior; HfB2
资金
- National Natural Science Foundation of China [51872239, 52061135102, 52002321]
- Creative Research Foundation of Science and Technology on Thermostructural Composite Materials Laboratory [5050200015]
- Fundamental Research Funds for the Central Universities [G2020KY05125]
The study investigated the oxidation and ablation behaviors of HfB2-SiC-Si/SiC-Si coatings under high temperatures, showing that the coatings exhibited good anti-ablation properties at 1800 degrees Celsius. Despite the severe corrosion at the nose tip, the protective layer composed of HfO2 and Hf-Si-O glass in the coating could withstand the scouring of the oxyacetylene torch.
Oxidation and ablation behaviors of HfB2-SiC-Si/SiC-Si coatings fabricated by dipping-carbonization joint gaseous silicon infiltration on cubic and nose-shaped carbon/carbon substrates were investigated. After 30 thermal cycles between 1500 degrees C and room temperature, the mass gain of the coated sample was 0.91 %, and the mass gain was 2.62 % after oxidation at 1500 degrees C for 870 h. The coated nose-shaped sample exhibited good antiablation properties at 1800 degrees C-2000 degrees C under oxyacetylene flame. Especially at 1800 degrees C, the mass ablation rate was -0.073 mg/s. Although the nose tip suffered the most serious corrosion, HfO2 scale surrounded by Hf-Si-O glass could withstand the oxyacetylene torch scouring.
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