Oxidation kinetics of a rough laminar pyrocarbon in O2-, H2O- and CO2-containing atmospheres

Abstract

The originality of this work relies on the identification of kinetic parameters for a rough laminar pyrocarbon material under three different oxidizing atmospheres. Thermogravimetric analysis was used to carry out oxidation tests on a ex-CVI porous C/C composite under O2-, H2O- and CO2-containing atmospheres at ≪ low-temperatures ≫. They were proven to be in a chemical reaction-controlled regime in the porous volume of the material and at its external surface through the use of X-rays micro-tomography characterization technique and simple analytical model-based considerations. Activation energies of 203.2 kJ.mol−1, 253.9 kJ.mol−1 and 302.2 kJ.mol−1 were identified under O2, H2O and CO2.