The effects of ammonium perchlorate (AP) content on the combustion phenomena, ignition time, combustion diffusion time, burnout time, combustion efficiency, agglomeration phenomena of aluminum (Al) powder as well as the surface morphology and particle size distribution of condensed-phase combustion products in the primary combustion process of AP/Al were studied using a CO2 laser ignition system combined with a high speed photography system, SEM and other analysis techniques related to condensed-phase combustion products. The results showed that the primary combustion process of AP/Al mixture could be divided into three stages: surface ignition stage, combustion diffusion stage and flame extinction stage. However, there were significant differences in the combustion phenomena of each sample in different combustion stages. As the AP content increased from 10wt% to 30wt%, the burning intensity of the sample was enhanced, and the sputtering phenomenon of the solid-phase particles in the combustion process became more and more obvious, the combustion of each sample in the flame extinction stage was mainly changed from the combustion staying at the burning surface of the sample to the combustion of the sputtered particles, and the solid-phase particles that had burned at the burning surface of the sample were first extinguished with increasing the reaction time. The surface ignition time, combustion diffusion time and the combustion duration time decreased, indicating that the combustion reaction rate gradually increased. Meanwhile, as the AP content in the AP/Al sample increased, the combustion efficiency of Al powder increased. Additionally, the particle size of the condensed-phase products also increased, which indicated that the degree of agglomeration increased with the increase of the AP content in the AP/Al sample.
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