微流控法制备超细HMX/FOX-7复合物及其性能测试

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

为了降低HMX感度,提高使用安全性,选用低感度含能材料FOX-7为包覆剂,利用微流控技术制备得到超细HMX/FOX-7复合物。采用红外、XRD分析表征了其结构,采用SEM分析了复合物的微观形貌,并对其进行热性能、感度性能及点火燃烧性能测试研究。结果表明,基于微流控技术制备的超细HMX/FOX-7复合物粒径范围0.92~2.91μm,平均粒径1.37μm,球形度较好,粒径分布窄;相比于传统宏观尺度搅拌法,微尺度制备条件使得HMX降感效果增强,获得的复合物具有更高的热稳定性和更优良的感度性能,热分解温度较传统法推迟11.8℃,撞击感度和摩擦感度分别由56%和52%降至32%和28%;HMX/FOX-7复合物的点火延迟时间随着激光功率密度的增加呈现递减的趋势,在相同功率密度条件下随着FOX-7含量的增加,复合物最小点火能量增大,点火延迟时间增加;与原料HMX相比,复合物的点火燃烧火焰更为明亮,火焰传播速率更快。

In order to reduce the sensitivity of HMX and improve its safety,the insensitivity energetic material FOX-7 was selected as the coating agent to prepare the ultrafine HMX/FOX-7 composite by microfluidic 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 of 1.37μm,good sphericity and narrow particle size distribution.Compared with the traditional macro-scale stirring method,the micro-scale preparation conditions 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℃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.The ignition delay time of HMX/FOX-7 composites showed a decreasing trend with the increase of laser power density.Under the same power density,the minimum ignition energy and ignition delay time of the composites increased with the increasing of FOX-7 content.Compared with the raw material HMX,the ignition flame of the compound is brighter and the flame propagation rate is faster.