Abstract:In order to enhance insensitivity of CL-20, CL-20/NQ composite energetic microspheres were prepared by coating the NQ on the surface of CL-20 employing spray crystallization process. Scanning electron microscopy (SEM), differential sanning calorimeter (DSC), X-ray diffraction (XRD) and impact sensitivity instrument were employed to investigate the morphology, thermal stability, crystal form and impact sensitivity of CL-20/NQ composite energetic microspheres. Results show that after coating, NQ was spherical agglomeration and successfully coated on the surface of CL-20. The prepared CL-20/NQ composite particles were spherical in shape, approximately 20 μm in size and ε-CL-20 crystal in form. The activation energy of CL-20/NQ composite energetic microspheres was 72.62 kJ/mol higher than that of raw CL-20, and this meant thermal stability of CL-20/NQ greatly improved. The mechanical sensitivity of CL-20/NQ was very low. In impact sensitivity tests, special height of CL-20/NQ composite energetic microspheres increased by 32.65 cm and 10.9 cm compared with raw CL-20 and CL-20/NQ mixture, respectively.