Kinetic parameters of the thermal explosion reaction of Ni-Al-Fe system

The activated energy and reaction order of the thermal explosive reaction of Ni50Al20Fe30 (wt%) were determined under linear heating rate by the difference quotient method. High purity nickel, aluminum and iron powders were mixed thoroughly in a ball mill and dried in vacuum. The samples were tested by differential thermal analysis at a heating rate of 20 K/min under an argon atmosphere. To estimate the value of a thermal effect, α-Al₂O₃ was used as the primary standard. A differential thermal analysis (DTA) run yielded the temperature increment ΔT due to the thermal explosion reaction heat release as a function of temperature under a constant heating rate.