浇注型PBX炸药的打印成型及其爆炸性能

In order to apply additive manufacturing technology to explosive forming and preparation, and solve the problem of diversification and abnormity of warhead charge which is difficult to be realized by conventional means, the 3D direct writing process and automatic dispensing machine were used to complete the printing and forming of HMX and HMX/Al samples. Rheometer was used to test the effect of different solid contents on the rheological properties of the printed slurry, and the printing parameters were optimized. The thermal decomposition properties, microstructure and detonation properties of the printed grain were tested. The results show that the slurry with solid content of 80.0%-87.5% has the effect of shear thinning and the characteristics of composite pseudoplastic fluid, which can meet the printing requirements. The decomposition peak temperatures of HMX is advanced from 288.2℃ to 244.4℃ and 235.5℃ respectively by using GAP/N100 as binder slurry and adding aluminum powder. When the solvent of HMX slurry is 5-6g, the printing pressure is 8-13psi, and the solvent of HMX/Al slurry is 2-3g, the printing pressure is 10-16psi, and the printing rate is 10mm/s, the forming effect is good. There are no obvious cracks and pores in the 3D printed grain. The average density of HMX grain is 1.67g/cm³, and the average detonationn velocity is 7662.9m/s. The average density of HMX/Al is 1.72g/cm³, and the average heat of explosion is 7359.41kJ/kg.