Abstract: In order to study the combustion performance of boron (B) coated with AP, the AP/B composite particles are prepared by solvent evaporation method. SEM is used to observe the surface morphology of coating layers. The CO₂ laser ignition devices are selected to study its ignition and combustion characteristics. A calorimetric bomb is used to test the explosion heat of DNTF-based explosives with AP/B composite particles. Experiment results show that AP is homogeneously crystallized on the surface of boron and the fine coating layers can be obtained by strictly controlling the technical parameters and using the solvent evaporation method. In comparison with classical boron particles, the combustion characteristics of AP/B composite particles are significantly improved, and the light intensity is instantaneously approximated to its maximum value. The explosion heat (7 696 kJ/kg) of DNTF-based explosives with AP/B composite particles is 6.5 percent higher than that of uncoated explosive (7 208 kJ/kg), which indicates that the release energy can be effectively increased by coating technique.

Key words: ordnance science and technology, boron-containing explosive, AP/B composite particle, AP coating layer, combustion performance, explosion heat