Abstract
The oxidation kinetics of SiC nanowire coated carbon fibers in oxygen atmosphere were studied through isothermal thermo-gravimetric analysis and dynamic thermo-gravimetric analysis. The isothermal weight loss curve showed two activation energies for the oxidation of SiC nanowire coated carbon fibers. The oxidation process was reaction controlled below 923K with an activation energy of 125kJmol−1 and mixed controlled (gas diffusion and reaction) above 923K with an activation energy of 28kJmol−1. Under non-isothermal condition the oxidation mechanism followed three-dimensional diffusion obeying the Zhuravlev–Lesokhin–Tempel'man mechanism with differential form F(α)=1.5(1−a)4/3[(1−a)−1/3−1]−1 and integral form G(α)=[(1−a)−1/3−1]2. The kinetic and thermodynamic parameters were evaluated and correlated with surface induced oxidation mechanism.
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