Influence of porosity and total surface area on the oxidation resistance of C/C composites Original Research Article

The oxidation tests of five different porosity C/C composites for non-isothermal oxidation and three different porosity samples for isothermal oxidation in O2 and two samples which had approximate porosity and different total surface area values for static air oxidation were performed. Results show that the oxidation was controlled by the total surface area other than by the open porosity or the densification degree of samples or amount of pore entrance. The oxidation occurred preferentially at the fiber–matrix interface and pyrocarbon–pyrocarbon interface, and then progressed along the micro-cracks between the interfaces.