Preparation of Ultrafine HMX/FOX-7 Composites by Microfluidic Technology and Its Performance Tests.

In order to reduce the sensitivity of HMX and improve its safety, the insentivity energetic material FOX-7 was selected as the coating agent to prepare the ultrafine HMX/FOX-7 composite by microfluids technology. The structure was characterized by IR and XRD analysis, the microstructure of the composite was analyzed by SEM, and its thermal properties, sensitivity properties and ignition and combustion properties were investigated. The results show that the ultrafine HMX/FOX-7 composites prepared based on microfluidic technology have a particle size range from 0.92 to 2.91µm, with an average particle size 1.37µm, good spherically and narrow particle size distribution. Compared with the traditional macro-scale stirring method, the micro-scale preparation condition enhance the desensitization effect of HMX, and the obtained composites have higher thermal stability and better sensitivity properties. The thermal decomposition temperature is 11.8°C later than the traditional method, and the impact sensitivity and friction sensitivity are reduced to 32% and 28% form 56% and 52%, respectively. The ignition delay time of the HMX/FOX-7 composite increased with the laser power density. Under the same power density, the minimum ignition energy and ignition delay time of the composites increased with the increasing the FOX-7 content. Compared with the raw material HMX, the ignition flame of the compound is brighter and the flame propagation rate is faster. [ABSTRACT FROM AUTHOR]