Abstract
The non-isothermal TG/DSC technique has been used to study the kinetic triplet of ignition reaction of Mg/NaNO3 pyrotechnic under nitrogen atmosphere at different heating rates (5, 10, 15, and 20 °C min−1). The TG/DSC results showed that the mass gain after ignition increased and the heat of ignition reaction decreased with increasing heating rate, indicating that the reaction between Mg and NaNO3 was not complete during the ignition process. The activation energy (Ea) was calculated using Starink model-free method. The pre-exponential factor (A) and kinetic model function were determined by means of the compensation effect and the selected model was confirmed by the nonlinear model fitting method. The average values of Ea and logA for the ignition reaction of Mg/NaNO3 were found to be 148.46 ± 3.37 kJ mol−1 and 10.04 min−1, respectively. The model fitting method proved that the ignition reaction of Mg/NaNO3 pyrotechnic follows the mechanism of A4 (g(α) = [−ln(1−α)]1/4) as a nucleation reaction model.
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