Long-term oxidation behavior of carbon/carbon composites with a SiC/B4C–B2O3–SiO2–Al2O3 coating at low and medium temperatures

CATEGORY: COATINGS
Long-term oxidation behavior of carbon/carbon composites with a SiC/B4C–B2O3–SiO2–Al2O3 coating at low and medium temperatures

Type	Journal Article
Author	Chenglong Hu
Author	Shengyang Pang
URL	http://www.sciencedirect.com/science/article/pii/S0010938X15001018
Volume	94
Pages	452-458
Publication	Corrosion Science
Date	May 2015
Abstract	To achieve the long-term oxidation protection of carbon/carbon composites at low and medium temperatures, researchers applied a SiC/B4C–B2O3–SiO2–Al2O3 coating to the composites. The coating exhibits a dual-layer structure with a dense SiC inner layer and B4C–B2O3–SiO2–Al2O3 multi-phase outer layer. They studied the effects of Al2O3 contents and oxidation temperatures on the oxidation behavior of the coated C/C. Results revealed that the coating with 7.7 wt.% Al2O3 performs excellent self-healing ability and can protect the C/C composites with weight losses of less than 1% for 250 h at 800 °C and for 90 h at 900 °C and 1000 °C.