期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 41, 期 1, 页码 194-203出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.07.040
关键词
C/C composites; Thermal-shock resistance; Oxidation resistance; Mechanical properties
资金
- National Natural Science Foundation of China [51872239, 51572223]
- Fundamental Research Funds for the Central Universities [G2020KY05125]
The GSI-SiC-Si coating showed lower roughness, better mechanical and anti-oxidation properties compared to the PC-SiC-Si coating. It could effectively protect C/C composites under high temperatures for an extended period without weight loss.
To reduce the influence of coating preparation on the mechanical properties of carbon/carbon composites and further improve the antioxidant properties of the coating, a SiC-Si coating was fabricated on carbon/carbon composites by gaseous silicon infiltration (GSI-SiC-Si). For comparison, a SiC-Si coating was also prepared by pack cementation (PC-SiC-Si). A comparative investigation showed the GSI-SiC-Si coating possesses relative lower roughness, better mechanical and anti-oxidation properties. The GSI-SiC-Si coating samples maintained 87.8 % flexural strength of bare C/C composites, while the C/C substrate was severely siliconized in PC-SiC-Si coating samples. The GSI-SiC-Si coating samples could undergo 30 thermal cycles between 1773 K and room temperature and effectively protect C/C composites from oxidation at 1773 K for more than 500 h without weight loss.
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