In order to obtain high-energy and low-sensitivity CL-20 particles,spray drying process was used to improve the morphology of CL-20 raw materials.Butadiene rubber BR,microcrystalline wax and deflocculated graphite were used to coat CL-20/micro-nano composite aluminum powders to construct a reactive and energy-reinforced coating shell,improving the safety use of CL-20 simultaneously.Scanning electron microscope(SEM)was used to observe the morphology of coated parti-cles,and MATLAB program code was written to identify and calculate the length-width ratio and roundness value,thus charac-terizing their sphericity.Organic element analysis(EA)and inductively coupled plasma atomic emission spectrometry(ICP-AES)were used to test the actual content of CL-20 and aluminum powders in the coated particles.The crystal structure of the coated particles was analyzed by X-ray diffraction(XRD).The sensitivity and heat of explosion were tested by the national mil-itary standard method and compared with those of CL-20 raw materials.The coated particles and their decomposition products were analyzed by differential scanning-thermogravimetric-fourier infrared-mass spectrometry(DSC-TG-FTIR-MS).The results show that the particle size of the prepared coated particles is about 10µm,the sphericity is high,the length-width ratio is 1.03,and the roundness value is 0.91.The actual contents of CL-20 and aluminum in the coated particles are 88.17％and 7.76％,respectively.The crystal shape of the coated particles is β-CL-20.The explosion probability of friction sensitivity and impact sensitivity are 36％and 38％,respectively.The characteristic drop height of impact sensitivity is 13.4cm,the sensitivity re-duction is obvious.The heat of explosion is 5946J/g,which is 97.91％of CL-20 raw material(6073J/g),and the energy loss is not more than 3％.
维普
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