Preparation of Nano-SrCO3/AP Composite Particles and Study of Their Impact Sensitivities and Thermal Decomposition Performances

Nano-SrCO3 was prepared by ultrasonic-assisted co-precipitation, and nano-SrCO3/AP composite particles were prepared by solvent-nonsolvent method. The morphology, particle size, crystal type and composite effect of nano-SrCO3/AP composite particles were characterized by transmissive electron microscope (TEM), scanning electron microscope (SEM) and X-ray powder diffractometer (XRD). The impact sensitivities of SrCO3/AP composites with pure AP and different contents were tested. Thermal decomposition properties of nano-SrCO3/AP composite particles and a simple mixture of nano-SrCO3 and AP were analyzed by using DSC. The nano-SrCO3/AP composite particles were calcined in a muffle furnace at 350℃ and 500℃, respectively, for 1 h. The calcined products were characterized by XRD, and the action mechanism of nano-SrCO3 was studied. The results show that nano-SrCO3 prepared by ultrasonic-assisted co-precipitation is spherical with a particle size of about 60 nm, and its crystalline form is orthorhombic. In the nano-SrCO3/AP composite particles prepared by solvent-nonsolvent method, nano-SrCO3 is uniformly distributed on the surface of AP. The impact sensitivity of AP increases with the addition of nano-SrCO3. Nano-SrCO3 added in two different ways can increase the decomposition peak temperature of AP at high temperature, but has no effect on the decomposition of AP at low temperature. Compared with the simple mixture of nano-SrCO3 and AP, the peak decomposition temperature of AP in nano-SrCO3/AP composite particles is increased by 6.02℃. It is proved that the negative catalytic effect of nano-SrCO3 on AP decomposition at high temperature can be improved by compounding nano-SrCO3 with AP. © 2020, Editorial Board of Acta Armamentarii. All right reserved.