Study on Performance of Super-reactive AlMg/KMnO4 Thermites.

Different mass fractions of AlMg alloys are prepared by mechanical ball milling. AlMg/KMnO4 thermites are prepared by sonication dispersion method. These thermites could be an energetic material in the field of reactive materials and explosives. AlMg/KMnO4 thermites with different Al/Mg ratios are investigated by differential scanning calorimetry (DSC) , ignition and combustion measurements respectively. The results show that the reaction temperatures of AlMg/KMnO4 decrease obviously with the higher Mg contents, the ignition temperatures decrease from 723 K to 493 K, indicating that the thermal reactivity of AlMg/KMnO4 thermites is better than that of Al/KMnO4. The combustion products of AlMg/KMnO4 thermites contain Al2O3, MgO and Mn, thus Mn is produced by the thermite reaction of AlMg/KMnO4. AlMg alloys react with the decomposited product of KMnO4. [ABSTRACT FROM AUTHOR]