Thermochimica Acta, Vol.549, 57-62, 2012
A novel approach to determine oxidation kinetics of Mo-16Cr-xSi(x=4-6 wt.%) alloy using stepwise isothermal thermo-gravimetry
A new method was developed for measuring the kinetics of oxidation. In this method, apparent activation energy and the exponent related to the oxidation phenomena can be evaluated by conducting a single experiment. The method was tested for its applicability by measuring the activation energy for oxidation of pure Mo. It was found that the isothermal weight change data of Mo from stepwise isothermal thermogravimetry (SITG) could be well analyzed to get kinetics parameters according to the empirical rate equation. dY/dt = nk(T)Y(1 - Y) (1 - Y/Y)(1/n) Further, the method was extended for evaluating the oxidation kinetics parameters for Mo-16Cr-(4-6 wt.%)Si alloys. Effects of concentration of Si on the oxidation behaviors of the alloys were also studied. (C) 2012 Elsevier B.V. All rights reserved.