Materials Research Bulletin, Vol.91, 189-196, 2017
Oxidation mechanism of SiC-Zirconia-Glass ceramic coated carbon/carbon composites at 1123-1273 K
A novel type of SiC-Zirconia-Glass coating for carbon/carbon(C/C) composites was designed and prepared by slurry method and their microstructure and oxidation behavior at temperatures of 11231273 K were investigated. The results show that the weight loss rate of samples was below 1.5% after oxidation of 70 h and have excellent mechanical properties remaining after a 1123-1273 K oxidation process. The relationship between the weight loss rate and oxidation time can be fitted to an exponential curve and the reaction activation energy of diffusion through the coating cracks was 16.68 kJ mol(-1). It was found that the oxidation model of SiC-ZrO2-Glass coated C/C composites was not exactly follow to Arrhenius's law during temperature of 1123-1273 K and has characteristics of defective oxidation. (C) 2017 Elsevier Ltd. All rights reserved.