Thermal oxidation process of in-situ silicon carbide incorporated carbon aerogel, experimental and kinetic study

Si-based phase component was incorporated in carbon aerogel using the sol-gel polymerization. The results of non-isothermal kinetic study in the temperature range of 500-1200 degrees C confirm the determinant role of the diffusion process in the global oxidation kinetic due to the highly porous character of the hybrid aerogel. This leads to the effect of the reaction condition on the reaction pathway; so that, a shift is observable from the reaction-control to diffusion-control regimes of the oxidation process by increasing the heating rate. The rate constants corresponding to these two different regimes were differentiated by applying the non-parametric kinetic analysis.