The core-shell material AP/Al were prepared by two-step process of"AP pretreatment and surface deposition"using ammonium perchlorate and aluminum powders as raw materials.The physical properties of surface morphology,element distribution,particle size distribution,and density of core-shell material AP/Al were characterized by SEM-EDS,particle size analysis and density test.The sensitivity characteristics,thermal decomposition performance,heat of explosion and active alu-minum content in the residue of core-shell energetic material AP/Al composite were measured and compared to those of Al/AP physical mixture,the decomposition activation energies of AP/Al physical mixture and core-shell material AP/Al were calculat-ed by Flynn-Wall-Ozawa equation,and the combustion characteristics of core-shell material AP/Al were recorded by high speed video camera.The results show that core-shell material AP/Al composites are spherical-like particles with AP as core and aluminum powder as shell,its density is 2.048 5 g/cm3.Compared to the AP/Al physical mixture,the electrostatic spark sensitivity of core-shell material AP/Al increases from 27.94mJ to 102.88mJ,and the activation energy of AP decomposition peak at low and high temperature increase by 10.9kJ/mol and 9.0kJ/mol,respectively.There is little difference between the heat of explosion of AP/Al physical mixture(9298.4J/g)and core-shell material AP/Al(9260.6J/g).However,the con-tent of active aluminum in the AP/Al residue is reduced by more than 90％compared to Al/AP physical mixture.Rather than the droplet drag flame produced by the combustion of aluminum powder in the AP decomposition atmosphere,the aluminum droplets sputter a lot of fine aluminum beads,and the combustion flame is more uniform and bright when the core-shell material AP/Al are burned.
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