Study On Synthesis And Performance Of Super-reactive AlMg Alloys Thermites

Thermite was endowed with highly exothermic large energy releasing rate、good satfty performance, which was widely used in the field of ordnance. The aim of this paper is to prepare a kind of thermites it had low ignition temperature and super-reactive. The main research contents are as follows:(1) Different mass fractions of Al-Mg (10-50%) alloys were prepared by mechanical ball milling. The synthesized products were characterized by XRD, SEM, EDS, TG, DSC and so on. The average sizes of Al-Mg alloy particles vary from1to10um. It were showed that the sizes of Al-Mg alloy could be obviously decreased by mechanical ball milling. With the content of Mg increased from0.1to0.5, the reaction activities of Al-Mg alloy were increased as well. Ignition and combustion performces of the Al powder were improved.(2) AlMg/KMnO4thermites were prepared by sonication dispersion method. The samples were characterized by DSC, ignition tests, combustion tests and combustion product analysis. The reaction temperatures of AlMg/KMnO4were decreased as the increasing of Mg content from723to493K. Ignition and combustion performces of AlMg/KMnO4thermites were obviously improved as well. Instantaneous vigorous flame and large flame splash range were showed when the samples were ignited. While Al0.5Mg0.5/KMn04displayed the largest flame splash range. Al2O3, MgO and Mn were exist in all combustion products. Mn were the products of AlMg/KMnO4thermite reaction. Al-Mg alloys reacted with the decomposition products of KMnO4ranther than reacted with KMnO4directly.(3) AlMg/CuO and AlMg/CuO-KMnO4thermites were prepared by sonication dispersion method. The samples were characterized by DSC, ignition tests, combustion tests and combustion product analysis. With the content of KMnO4increased, AlMg/CuO-KMnO4thermites showed lower ignition temperatures and higher thermal reactivity.The ignition temperature of Alo.5Mgo.5/CuO-30%KMn04was decreasd to493K. Thermal reactivity and ignition performance of AlMg/CuO thermites were enhanced by adding30percent KMnO4. These kind of thermites were reacted at relatively low temperature and released large energy. Al2O3, MgO, Cu, Cu2O and CuO were existed in the combustion products of AlMg/CuO thermites. It illustrated that AlMg/CuO thermites were reacted. The reason could be that CuO was oxidized to Cu2O at high temperature condition. Al2O3, MgO, Cu, Cu2O, CuO and Mn were existed in the combustion products of AlMg/CuO-30%KMnO4thermites. Cu and Mn were all the products of AlMg/CuO-30% KMnO4thermite reaction.