Preparation Of HMX/TATB Composite Particles Using A Mechanochemical Approach And Its’ Proformance Study

High-energy material HMX has been widely used in solid propellant and weapon because of its high detonation velocity, high detonation pressure and high detonation heat. However, HMX has failed to see widespread application due to its high sensitivity. For the purpose of reducing the sensitivity and energy loss of HMX, we chose TATB, an insensitive energy material, as the coating material for coating HMX particles in this subject. We studied the coating conditions’ effect on the coating and the structure and performance of HMX/TATB composite particles. The details as follows:In this paper, submicron TATB was prepared by mechanical milling method. The laser granularity measurement and Scanning Electron Microscopy (SEM) were used to characterize particle size distribution and morphology of the submicron TATB. We studied the effect of dry process on submicron TATB particles size. The polymorph and purity for submicron CL-20 were characterized by Raman, FT-IR, XRD and HPLC, respectively. The results show that the submicron TATB particles are flake with an average particle size d50=320nm. The dispersion of TATB particles is best after being freeze drying. The polymorph for the submicron TATB with high purity is consistent with the raw TATB.HMX/TATB composite particles were prepared using a mechanochemical approach. We explored the best technology conditions of the preparation of HMX/TATB composite through the orthogonal experiment. The results show as follows:grinding medium:silicone balls, stirring speed:240 rpm/min, reaction temperature:60℃, reaction time:8 hours, the ratio of HMX and TATB:8:92, and HMX/TATB composite were obtained by water bath oven drying. SEM results show that a compact coating layer TATB was on the surface of HMX. EDS surface elements analysis show that the coated degrees reached to 66.10%.At last, we conducted the structure characterization and performance testing and performance testing of HMX/TATB composite particles. Raman and FT-IR results show that there is hydrogen bonding in the HMX/TATB composite. XRD result show that the crystal form of HMX maintained unchanged during the whole preparing process. Compared with the uncoated HMX particles, the impact and friction sensitivities of HMX/TATB composites were decreased by 56.1% and 70%. The decomposition characteristics of HMX/TATB composite were investigated by DSC, showing that the decomposition peak temperature increased by 5.14℃ while the phase transition temperature decreased by 4.06℃ oppositely. Then the apparent activation energy and the kinetic parameter of HMX/TATB composite particles were calculated.