Preparation And Process Optimization Of TATB Booster Explosive

Booster is an important aspect of explosion sequence,and its low vulnerability is to ensure the safety of ammunition an essential element. By far, TATB is the best heat resistance, low mechanical sensitivity insensitive explosive, by choosing a high energy explosives with TATB elemental form mixed explosives can modified the certain characteristics of high explosives through the excellent heat TATB performance characteristics and insensitive high explosives, to meet booster safety performance requirements. In this paper, HMX and CL-20 as the single high-energy explosive, with the insensitive heat resistance of TATB, are prepared containing TATB booster, and its performance is tested about the effect of booster explosive properties on content of TATB, as well as the preparation booster process is optimized. The main contents include the following aspects:(1)High quality ultrafine TATB were prepared by using homemade ultrasonic atomizer equipment with the principle of solvent/non-solvent. SEM and XRD was used to test morphology and polymorph of the prepared ultrafine TATB, and DSC and homemade 12-type hammer instrument was used to analysis its thermal property and impact sensitivity. The results showed that: the prepared Ultrafine TATB were spherical structure, and the particle's diameter was less than 200 nm, and by the X-ray diffraction pattern TATB crystal morphology did not change during the manufacturing process, only the significantly was lower diffraction peak height, peak width of the shape. Compared with the raw material, ultrafine TATB thermal decomposition apparent activation energy and the critical temperature of thermal explosion were slightly reduced, and the thermal decomposition was more easily occurred due to the smaller particle size and the increase of the specific surface area. After impact sensitivity test showed safety performance of ultrafine TATB insensitive was still excellent.(2)PBX containing TATB was prepared by the solution-water suspension technology. The conditions of process was optimized by single factor experiment, the research showed the optimized conditions was that: the pressure was 0.04 MPa, the temperature was 60?, the solid-liquid ratio was 1:10, the stirring speed is 500r/min, the droplet acceleration is 15 mL/min.(3)Under the optimal conditions, TATB/HMX PBX which containing different ratios of TATB was prepared. By SEM analyzing its morphology, TATB/HMX PBX was dense, regular shape, and with the reduction of TATB the surface roundness decreased. By XRD test results showed that TATB and HMX polymorphs did not change in the coating process. Then to test its DSC, shock sensitivity, impact sensitivity safety, showed that join ultrafine TATB in the HMX to prepared PBX, HMX apparent activation energy and the critical temperature of thermal explosion had sharply improving than raw materials, and with the change of TATB content HMX thermal properties substantially unchanged, indicating ultrafine TATB has promoting effect on thermal stability of HMX, but did not increase with increasing the TATB content. With the reduction of the content of TATB Shock Sensitivity decreased. But they were available through small gap safety testing and impact sensitivity of safety testing.(4)Under optimal conditions, TATB/CL-20 bonded explosive which containing different ratios of TATB was prepared. By SEM analyzing its morphology, with the increase of TATB content, the coating products tended to be spherical. By XRD analysis of TATB/CL-20, during the process of preparation PBX, the crystal type of CL-20 did not change, still was ?-CL-20. In addition, thermal performance analysis and impact sensitivity test of TATB/CL-20 were performed. The results showed that the apparent activation energy and the critical temperature of thermal explosion had greatly improved than uncoated CL-20, however CL-20 thermal performance difference was very small which in several PBX which contain TATB, indicate Ultrafine TATB can contribute to the thermal stability of the CL-20, but did not increase with increasing the content of TATB. From the results of the impact sensitivity test, can find that ultrafine TATB can significantly reduce the impact sensitivity of CL-20, and with the increase of TATB content was less than 15% the impact sensitivity reduction extent was decreases.