Abstract
Different compositions of yttrium silicates coatings were deposited on SiC-C/C by plasma spraying and an outer borosilicate glass was applied on the yttrium silicates coatings surfaces. The structure of the multi-layer coatings was characterized by XRD and SEM analyses. High temperature oxidation behavior of the multi-layer coatings coated C/C composites was investigated. Results show that SiC/2SiO2·Y2O3/1.5SiO2·Y2O3/ SiO2·Y2O3/glass multi-layer coating has better high temperature oxidation resistance, protecting carbon/ carbon composites from oxidation at 1 773 K in air for 164 h with the weight loss of 1.65%. The oxidation weight loss of the coated C/C with time accorded with parabolic rule in the temperature range 1 573 K–1 873 K; and the corresponding oxidation activation energy of the coated carbon/carbon composites is 132.2 kJ/mol.
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Supported by National Natural Science Foundation of China(No.50772063) and the Program for New Century Excellent Talents in University (No.NCET-06-0893)
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Huang, J., Li, H., Zeng, X. et al. Structure and oxidation behavior of a plasma sprayed yttrium silicates coated SiC-C/C with a glass outer sealant from 1 573K to 1 873K. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 23, 33–37 (2008). https://doi.org/10.1007/s11595-006-1033-x
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DOI: https://doi.org/10.1007/s11595-006-1033-x