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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/2SiO_2Y_2O_3/I.5SiO_2 Y_2O_3/SiO_2 Y_2O_3/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.
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 analyzes. High temperature oxidation behavior of the multi-layer coatings coated C / C composites was investigated. Results show that SiC / 2SiO_2Y_2O_3 / I.5SiO_2 Y_2O_3 / SiO_2 Y_2O_3 / 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.