The Uniform Combination of Nano-catalytic Materials with Ultrafine Ammonium Perchlorate for Ehancing the Burning Rate and Reducing the Sensitivity of Composite Modified Double-base Propellant

In order to increase the burning rate and decrease the sensitivities of composite modified double-base(CMDB)propellant, supersonic jet milling technology was used to in-situ dispersion of nano catalysts(nano copper chromite and nano cadmium oxide)on the surface of ultrafine ammonium perchlorate(AP)to prepare nano-catalytic materials/ultrafine AP composites for using in high burning rate CMDB propellant with GATo. The scanning electron microscopy(SEM), differential scanning calorimetry(DSC)test, mechanical sensitivity test and the electrostatic spark sensitivity tests were used to analyze the nano catalytic materials/ultrafine AP composites. The combustion performance, mechanical performance, mechanical sensitivity and stability of GATo propellant containing nano catalytic materials/ultrafine AP composites were also studied. The results show that with the help of the supersonic jet pulverization force field, while the ultrafine AP was achieved, the nano catalytic materials were uniformly in situ dispersed on its surface, which not only increased the thermal decomposition rate of the ultrafine AP, but also reduced the mechanical sensitivity of ultrafine AP. Compared with the blank GATo propellant, the burning rate of GATo propellants containing nano catalytic materials/ultrafine AP composites increased from 55mm/s to 70.27mm/s(20℃, 10MPa), the mechanical properties and stability were basically maintained, the friction sensitivity was reduced from 95% to 80%, and the impact sensitivity characteristic drop height value was increased from 13.9cm to 14.7cm, achieving an effective balance between high burning rate and low sensitivity of CMDB propellant. © 2023 China Ordnance Industry Corporation. All rights reserved.