No abstract

In order to study the effect of fuel Mg and metal oxide CuO on the reaction of thermite, different proportions of Al-Mg alloys and MoO 3 -CuO metal oxides were prepared by mechanical ball milling, and then the samples of Al 1-x Mg x /(MoO 3 ) 1-x CuO x composite thermite were prepared by ultrasonic dispersion method. The samples were characterized by SEM, TG-DSC, and constant pressure combustion experiments. The results show that in quaternary thermite, adding CuO increases initial exothermic temperature, but increases exothermic heat in high-temperature regions, and effectively reduces the activation energy of the thermite reaction. On the contrary, adding Mg reduces exothermic heat in the high-temperature areas, but reduces initial exothermic temperature. After calculation, the quaternary thermite with the best exothermic performance is Al 0.8 Mg 0.2 /(MoO 3 ) 0.5 CuO 0.5 . Its initial reaction temperature is only 614 °C, but the heat release is up to 2217 J/g. Its activation energy is only 106.7 kJ/mol, but the critical temperature of thermal explosion is up to 927.9 K. At the same time, Al 0.8 Mg 0.2 /(MoO 3 ) 0.5 CuO 0.5 has better combustion performance. During combustion, the flame is jet-like, and the main products are Al 2 O 3 , Mo and Cu. This work provides a reference for studying the thermal safety and combustion performance of quaternary thermite.

The addition of polytetrafluoroethylene as a binder in aluminum thermite allows the application of aluminum thermite from the traditional high temperature and high heat to the chemical corrosion direction. The stability of the samples was tested by theoretical calculations of the critical thermal explosion and mechanical sensitivity experiments. The microscopic morphology of the aluminum thermite was characterized by scanning electron microscopy, and the thermodynamic properties of the samples at different heating rates were investigated by the TG-DSC method.