Modelling of oxidation kinetics of C/SiC composites based on factorization method

The mass change curves for C/SiC composites oxidized in dry oxygen were analyzed using factorization method and the different factors influencing the composites oxidation kinetics in different temperature ranges were determined, based on which a model for the oxidation kinetics of C/SiC composites was developed. The main conclusions are as follows: for θ< 700°C, the oxidation kinetics of the composites is controlled by the reaction rate of carbon with oxygen and so-called linear kinetics is observed; for 700°C<θ<1000°C, it is the oxygen diffusion through coating cracks that controls the composites oxidation kinetics, representing a parabolic kinetics; for θ>1000°C, the closing of coating cracks, oxygen diffusion through silica film and the oxidation of SiC coating will control the oxidation kinetics of the composites.