1999 Volume 48 Issue 3 Pages 123-127
Carbon/carbon (C/C) composites are known to posses low density and excellent mechanical properties even at high temperature. For this reason, C/C composites are attractive material systems for high temperature structural applications. However, C/C composites are easily oxidized in air above 500°C. In order to overcome this serious defect, SiC coating has been currently studied for use as a oxidation protection system. However, it is well known that a significant mismatch in thermal expansion between the C/C substrate and SiC coating causes a lot of coating cracks during the cooling process after the coating treatment. These cracks allow the oxygen diffusion toward the C/C substrate and degrade the oxidation resistance. In this paper, oxidation behavior of non-coated C/C composite (Bare C/C) and SiC-coated C/C composite is explained.