Pickering乳液自组装CL-20/n-Al/F2605复合空心微球的制备与性能OA北大核心CSTPCD

High-energy and high-heat of detonation hexanitrohexaazaisowurtzitane(CL-20)/Al compo-site has li-mited its wide application in the field of explosives due to its high sensitivity.In order to prepare CL-20/Al energetic com-posites with high energy and safety performance,hollow spherical CL-20/n-Al/F2605 composites were prepared by Picke-ring emulsion method.Stability of Pickering emulsion,surface structure,thermal decomposition,combustion and safety performances of the composites were analyzed.The results show that the stability of the emulsion is good when the solid mass of CL-20 dissolved in 2 mL of ethyl acetate is 0.10～0.14 g,the mass ratio of oil to water is between 1︰5 and 1︰7,the ultrasonic time is less than 30 min,and the standing time is less than 120 min.The surface structure of the compo-site is rough,d50 is about 73.17 μm,and the components are uniformly compounded.Thermal decomposition peak tempe-rature and activation energy of the composites are 236.7℃and 164.6 kJ/mol,respectively.Activation energy of CL-20 in decomposition process is reduced by 21.2%by n-Al and F2605.Average linear burning rate of the composites is 7.14 cm/s.Its characteristic drop height H50 is 39.5 cm,which is 26.5 cm higher than that of raw material CL-20,and the safety performance is improved.