期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 38, 期 13, 页码 4346-4355出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2018.05.034
关键词
HfC-SiC gradient coating; Chemical vapor co-deposition; Mechanical properties; Ablation resistance; Ultrahigh temperature ceramic
资金
- National Natural Science Foundation of China [51521061, 51572223, 51402238]
- Natural Science Basic Research Plan in Shaanxi Province of China [2017JM5098]
- Astronautics Supporting Technology Foundation of China [2017-HT-XG]
To protect carbon/carbon composites against ablation at ultra-high temperature, a novel HfC-SiC gradient coating was fabricated by a facile one-step chemical vapor co-deposition. The phase composition, microstructure, bonding strength and ablation behaviour were investigated, and the mechanical properties of ablated coatings were characterized as well. The bonding strength of HfC-SiC gradient coating is 19.6 +/- 0.5 N (176% higher than that of HfC coating). HfC-SiC gradient coating shows excellent ablation resistance under oxyacetylene flame. The mass and linear ablation rate of HfC-SiC coating were only 0.153 +/- 0.02 mg.s(-1) and -0.998 +/- 0.08 mu m.s(-1), respectively. After ablation for 60s, the hardness and elastic modulus of ablated HfC-SiC gradient coating are higher than those of ablated HfC coating. The excellent ablation resistance of HfC-SiC gradient coating results from its high bonding strength and the adhesion effect of Hf-Si-O sticky glass phase.
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